CN113588423B - Soil body stretching compression coupling test device and soil body stretching compression coupling test method - Google Patents
Soil body stretching compression coupling test device and soil body stretching compression coupling test method Download PDFInfo
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- CN113588423B CN113588423B CN202111006637.8A CN202111006637A CN113588423B CN 113588423 B CN113588423 B CN 113588423B CN 202111006637 A CN202111006637 A CN 202111006637A CN 113588423 B CN113588423 B CN 113588423B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention provides a soil body stretching compression coupling test device and a soil body stretching compression coupling test method, wherein the test device comprises a reaction frame, a top plate, a bottom plate and side plates which are opposite; the axial tension component is matched with the top plate; the radial pressure assemblies are matched with the side plates, are aligned in the axial direction and radially surround the side plates to form a wrapping cavity; the soil making assembly comprises an upper matching sleeve which is detachably connected with the axial tension assembly, at least two flap type side movable plates which are detachably connected with the upper matching sleeve, a rubber film which is detachably arranged on the inner sides of the flap type side movable plates, and a lower matching sleeve which is detachably connected with the flap type side movable plates; at least two lamella type side movable plates enclose into a movable sleeve connected in the circumferential direction, each lamella type side movable plate is provided with a corresponding position aligning hole, adjacent lamella type side movable plates are detachably matched with a position aligning bolt in the corresponding position aligning holes, and the lower matching sleeve is detachably connected to the bottom plate.
Description
Technical Field
The invention belongs to the technical field of slope strength research, and particularly relates to a soil body tensile compression coupling test device and a soil body tensile compression coupling test method.
Background
The theoretical basis of the earthquake-induced slope instability analysis is the strength theory of the soil body, and along with the gradual deepening of the understanding of the earthquake-induced slope instability damage, the inventor discovers that the soil body in the slope is repeatedly pulled and pressed under the reciprocating action of earthquake force, so that a large amount of soil body in the slope is in a stress state of tensile-compressive coupling, namely the stability of the slope under the earthquake action depends on the theory of the pulling-pressing coupling strength of the soil body. Along with the continuous development of understanding of scientific researchers on the tensile strength of the soil body, the research on the tensile strength of the soil body obtains a certain research result, but the research on the tensile-compressive coupling strength theory of the soil body is still in a fumbling stage, and the main reasons are as follows: on one hand, the soil body belongs to a bulk material, the interrelation between the particles is relatively weak, and the strength of the soil body is substantially determined by the interaction force between the particles; on the other hand, the heterogeneity of the soil body causes the interaction among solid, liquid and gas phases to greatly influence the strength of the soil body, so that the tensile strength of the soil body is difficult to measure easily.
Therefore, how to accurately and reasonably describe and measure the damage characteristics and strength characteristics of the soil body in the tensile-compressive coupling stress state is an important research content, and is also an important foundation for perfecting the slope strength theory. However, the current research stage mainly comprises a soil body stretcher designed horizontally, and the strength characteristics of the soil body under the stretching-compressing coupling effect cannot be intuitively measured.
Disclosure of Invention
The invention aims to provide a soil body stretching and compressing coupling test device and a soil body stretching and compressing coupling test method, and aims to solve the technical problem that a soil body stretching instrument of horizontal design cannot intuitively measure the strength characteristics of a soil body under the stretching-compressing coupling effect.
In order to achieve the above purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a soil body tensile compression coupling test device, comprising: the reaction frame is provided with a top plate, a bottom plate and side plates which are opposite; the axial tension component is matched with the top plate; the radial pressure assemblies are matched with the side plates, are aligned in the axial direction and surround the side plates in the radial direction to form a wrapping cavity; the soil making assembly comprises an upper matching sleeve detachably connected with the axial tension assembly, at least two flap type side movable plates detachably connected with the upper matching sleeve, a rubber film detachably arranged on the inner side of the flap type side movable plates, and a lower matching sleeve detachably connected with the flap type side movable plates; the movable sleeve is formed by surrounding at least two flap type side movable plates into a circumferentially connected movable sleeve, each flap type side movable plate is provided with an alignment hole, the adjacent flap type side movable plates are detachably matched with alignment bolts in the corresponding alignment holes, and the lower matching sleeve is detachably connected with the bottom plate;
When a soil body sample is manufactured, the soil manufacturing assembly is detached from the axial tension assembly and the bottom plate to an independent state, and a forming cavity of the soil body sample is formed by the upper matching sleeve, the flap-type side movable plate, the rubber film and the lower matching sleeve;
during tensile compression test, the soil making assembly is mounted between the axial tension assembly and the bottom plate through the upper matching sleeve and the lower matching sleeve, the flap type side movable plate is removed, the soil body sample is accommodated in the wrapping cavity, axial tension is applied through the axial tension assembly, and radial pressure is applied through the radial pressure assembly.
In one possible implementation, the upper adapter sleeve, the lower adapter sleeve and the flap-type side movable plate together enclose an hourglass-shaped molding cavity with two thick ends and a thin middle.
In one possible implementation, the axial tension assembly includes: the axial fixing clamping seat is detachably connected with the upper matching sleeve; the axial stress sensor is connected with the axial fixing clamping seat; an axial displacement sensor connected with the top plate; and the axial loading structure is connected with the axial stress sensor and is matched with the top plate.
In one possible implementation, the axial tension assembly further includes an axial sliding seat disposed in cooperation with the axial loading structure, the axial sliding seat being movable relative to the top plate and fixed in a target position.
In one possible implementation manner, an axial positioning hole is formed in the matching range of the axial fixing clamping seat and the upper matching sleeve, an axial fixing bolt extending out of the upper matching sleeve and the axial fixing clamping seat is arranged in the axial positioning hole, one end of the axial displacement sensor is arranged on the top plate, and the other end of the axial displacement sensor is arranged on the axial fixing bolt.
In one possible implementation, each of the radial pressure assemblies comprises: the flap type confining pressure movable plates of the radial pressure assemblies are surrounded to form the wrapping cavity; the granular confining pressure filler is arranged between the flap type confining pressure movable plate and the soil body sample; the radial fixed clamping seat is detachably connected with the flap type confining pressure movable plate; the radial stress sensor is connected with the radial fixing clamping seat; a radial displacement sensor connected with the side plate; and the radial loading structure is connected with the radial stress sensor and is matched with the side plate.
In one possible implementation, the granular confining pressure filler includes: the confining pressure film is arranged on the flap type confining pressure movable plate, and a confining pressure cavity is formed between the confining pressure film and the flap type confining pressure movable plate; and fine sand is arranged in the confining pressure cavity and is used for applying confining pressure to the soil body sample.
In one possible implementation, the radial pressure assembly further comprises a radial slide seat disposed in cooperation with the radial loading structure, the radial slide seat being movable relative to the side plate and fixed in a target position.
In one possible implementation manner, a radial positioning hole which is aligned is formed in the matching range of the radial fixing clamping seat and the flap type confining pressure movable plate, a radial fixing bolt which extends out of the radial fixing clamping seat and the flap type confining pressure movable plate is arranged in the radial positioning hole, one end of the radial displacement sensor is arranged on the side plate, and the other end of the radial displacement sensor is arranged on the radial fixing bolt.
The soil body stretching compression coupling test device provided by the invention has at least the following technical effects: compared with the prior art, the soil body stretching compression coupling test device provided by the invention uses the counter-force frame as a supporting structure, uses the axial tension component to apply axial tension to the soil body sample, uses the radial pressure component to apply radial pressure to the soil body sample, can manufacture the soil body sample through the upper matching sleeve, the flap type side movable plate, the rubber film and the lower matching sleeve in the soil manufacturing component, can realize the vertical fixation of the soil body sample by detaching the flap type side movable plate and installing the flap type side movable plate between the axial tension component and the bottom plate, thereby intuitively observing and measuring the strength characteristics of the soil body sample under the stretching-compression coupling stress state, and further improving the slope stability analysis theory under the earthquake effect. In addition, because the soil making assembly can make soil and fix soil samples, the size of the soil samples can be unified, more uniform soil strength is obtained, the upper adapting sleeve and the lower adapting sleeve can uniformly stretch the soil samples, and the rubber film can be tightly attached to the soil samples, so that the integrity of the soil samples is ensured.
In a second aspect, the invention also provides a soil body stretching and compressing coupling test method, which adopts the soil body stretching and compressing coupling test device according to any implementation mode, and comprises the following steps:
soil preparation stage: wrapping the inner side of the flap type side movable plate with a rubber film, assembling the flap type side movable plate with a lower matching sleeve, filling soil in a formed forming cavity, compacting, assembling an upper matching sleeve, and disassembling the flap type side movable plate to obtain a soil sample;
test stage: the soil making assembly and the soil body sample of the flap type side movable plate are detached, the soil making assembly and the soil body sample are assembled between the axial tension assembly and the bottom plate through the upper adapting sleeve and the lower adapting sleeve, the axial tension assembly is used for providing tension in the vertical direction and recording continuous displacement change and tension of the soil body sample in the vertical direction, the radial pressure assembly is used for providing pressure in the horizontal direction and recording continuous displacement change and pressure of the soil body sample in the horizontal direction, a change curve of the soil body sample displacement and stress is drawn, and the strength of the soil body sample under the tensile compression coupling effect is directly obtained.
The soil body stretching and compressing coupling test method provided by the invention adopts the soil body stretching and compressing coupling test device in any implementation mode, and the two technical effects are the same and are not repeated here.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural diagram of a soil body tensile compression coupling test device according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a soil-making assembly according to an embodiment of the present invention when preparing soil samples.
Reference numerals illustrate:
1. soil body stretching compression coupling test device
100. Reaction frame 110, top plate 120, and bottom plate
130. Side plate 200, axial tension assembly 210 and axial fixing clamping seat
220. Axial stress sensor 230, axial displacement sensor 240, and axial loading structure
241. Axial pressurizing oil pump 242, axial hydraulic oil pipe 243 and axial hydraulic oil cylinder
250. Axial sliding seat 260, axial fixing bolt 300, and radial pressure assembly
310. Flap type confining pressure movable plate 320, granular confining pressure filler 330 and radial fixing clamping seat
340. Radial stress sensor 350, radial displacement sensor 360, and radial loading structure
361. Radial pressurizing oil pump 362, radial hydraulic oil pipe 363, and radial hydraulic cylinder
370. Radial sliding seat 380, radial fixing bolt 400 and soil making assembly
410. Upper mating sleeve 420, flap type side movable plate 430, and rubber membrane
440. Lower mating sleeve 450, locking aperture 460, and alignment aperture
470. Fastening bolt 500, base 2, soil body sample
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that when an element is referred to as being "fixed" to "another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to," "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on," "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The connection referred to herein may be integral connection, separate connection, detachable connection or non-detachable connection. The term "removable connection" as referred to herein requires a means that must be capable of repeated removal and installation. "plurality" refers to two and more numbers.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Referring to fig. 1 and 2 together, a soil body tensile and compressive coupling test device 1 and a soil body tensile and compressive coupling test method according to an embodiment of the present invention will now be described.
Referring to fig. 1 and 2, an embodiment of the present invention provides a soil body tensile compression coupling test device 1, including: a reaction frame 100 having opposed top and bottom plates 110, 120, and side plates 130; an axial tension assembly 200, which is arranged in cooperation with the top plate 110; the radial pressure assemblies 300 are matched with the side plates 130, and the radial pressure assemblies 300 are aligned in the axial direction and radially surround the wrapping cavity; and a soil making assembly 400 including an upper coupling sleeve 410 detachably connected to the axial tension assembly 200, at least two flap type side movable plates 420 detachably connected to the upper coupling sleeve 410, a rubber film 430 detachably provided at an inner side of the flap type side movable plates 420, and a lower coupling sleeve 440 detachably connected to the flap type side movable plates 420; wherein, at least two petal-type side movable plates 420 enclose into a movable sleeve engaged circumferentially, each petal-type side movable plate 420 is provided with an alignment hole 460, the adjacent petal-type side movable plates 420 are detachably matched with alignment pins in the corresponding alignment holes 460, and the lower matching sleeve 440 is detachably connected to the bottom plate 120.
When the soil sample 2 is manufactured, the soil manufacturing assembly 400 is detached from the axial tension assembly 200 and the bottom plate 120 to an independent state, and a forming cavity of the soil sample 2 is formed by the upper coupling sleeve 410, the flap-type side movable plate 420, the rubber film 430 and the lower coupling sleeve 440.
During tensile compression test, the soil making assembly 400 is mounted between the axial tension assembly 200 and the bottom plate 120 through the upper and lower coupling sleeves 410 and 440, the flap type side movable plate 420 is removed, the soil body sample 2 is accommodated in the wrapping cavity, the axial tension is applied through the axial tension assembly 200, and the radial pressure is applied through the radial pressure assembly 300.
It should be noted that, the axial direction mentioned in the embodiment of the present invention refers to the vertical direction of the soil body sample 2 during the test, and the radial direction refers to the horizontal direction of the soil body sample 2 during the test.
In addition, the soil body tensile compression coupling test device 1 provided by the embodiment of the invention combines the size of the sample model in the standard triaxial test, the size of the soil body sample 2 in the soil body tensile compression coupling test device 1 is the same as the size of the soil body sample in the standard triaxial test, the standard size of the soil body sample 2 manufactured by the soil manufacturing assembly 400 is phi 39mm, the defect that the size of a horizontal design sample is disordered is overcome, the problem of accurate description about the tensile stress section of the soil body strength covered wire in the soil body strength theory is perfected, the defect that the soil body strength covered wire in the traditional soil mechanics cannot accurately describe the condition that the soil body is subjected to tensile stress is overcome, the unstable axial tension applying methods such as a freezing cementing method and a cementing method are abandoned, the uniform transmission of tension is realized by utilizing the soil manufacturing assembly 400, and the soil body sample 2 can be obtained in a complete strength covered wire in a stress space by virtue of the axial tension assembly 200 and the radial pressure assembly 300, and particularly the soil body sample 2 is subjected to a complete process of stretching, compressing and compressing.
On the basis, if the axial tension is changed into the axial pressure, the test effect same as that of the traditional triaxial test can be achieved, and thus a complete soil body strength envelope can be obtained, therefore, the soil body tensile compression coupling test device 1 provided by the embodiment of the invention enriches the application range of the traditional geotechnical triaxial test, and improves the test method of the geotechnical test. The operation process of the soil body stretching and compressing coupling test device 1 provided by the embodiment of the invention is simpler and more convenient, the operation process of the soil body sample 2 is easy to operate, the stretching-compressing coupling principle of the soil body sample 2 is direct and clear, and the test result is easy to obtain.
The soil body stretching compression coupling test device 1 provided by the embodiment of the invention further comprises a base 500, the bottom plate 120 of the reaction frame 100 is fixed above the base 500 in a threaded connection, welding and other modes, and the base 500 serves as a test platform of the whole test device and plays a role in bearing the whole structure.
Specifically, the reaction frame 100 can counteract the tensile force, wherein the top plate 110 and the axial tension assembly 200 are cooperatively arranged, so that the axial tension assembly 200 applies a tensile force on the vertical direction to the upper coupling sleeve 410, the side plates 130 and the radial pressure assembly 300 are cooperatively arranged, so that the radial pressure assembly 300 applies a pressure force on the horizontal direction to the soil body sample 2, the bottom plate 120 is detachably connected with the lower coupling sleeve 440, the axial tension assembly 200 is detachably connected with the upper coupling sleeve 410, and the upper coupling sleeve 410 and the lower coupling sleeve 440 can provide a uniform tensile force for the soil body sample 2. Each flap type side movable plate 420 may be provided with a plurality of alignment holes 460, and the alignment holes 460 and the alignment pins are matched to increase the alignment speed when the flap type side movable plates 420 are mounted.
The plurality of radial pressure assemblies 300 are arranged in alignment in the axial direction, that is, in alignment in the vertical direction, and are capable of enclosing a synthetic wrap cavity in the radial direction, that is, in the horizontal direction, for accommodating the circumferential profile of the soil body specimen 2, specifically, the portion of the soil body specimen 2 exposed beyond the upper and lower adapter sleeves 410 and 440. The radial pressure assembly 300 may be two, three, four, etc. and may be capable of applying a uniform confining pressure to the soil body sample 2. For example, as shown in FIG. 1, two radial pressure assemblies 300 are employed for uniform application of the confining pressure.
When soil is produced, the rubber film 430 is at least arranged on the inner side of the flap-type side movable plate 420, and can also cover the inner sides of the upper and lower coupling sleeves 410 and 440 at the same time; during the test, the flap type side movable plate 420 is removed, the rubber film 430 is separated from the flap type side movable plate 420, the soil body sample 2 can be ensured not to loosen or collapse, and the soil body sample 2 is ensured to be tightly attached to the radial pressure assembly 300 due to radial shrinkage under the simultaneous actions of stretching and compression. The soil making assembly 400 can not only be used for making the soil body sample 2, but also be used for applying uniform tension to the soil body sample 2, so that the consistency and the systematicy of the matched device are higher, and unstable circumferential tension applying methods such as a freezing cementing method, a cementing method and the like are abandoned.
It can be understood that the number of the flap type side movable plates 420 can be more than two, three, four, etc., and the flap type side movable plates 420 are jointly enclosed to form a movable sleeve which is connected in the circumferential direction, so that a forming cavity with a circumferential profile can be enclosed, and a soil body sample 2 which can be vertically arranged is obtained. During the test, the integral crack development condition of the soil body sample 2 in the tensile-compressive coupling process can be monitored or recorded by utilizing CT scanning and DIC technology.
The soil body stretching compression coupling test device 1 provided by the embodiment of the invention has at least the following technical effects: compared with the prior art, in the soil body stretching compression coupling test device 1 provided by the embodiment of the invention, the counter-force frame 100 is used as a supporting structure, the axial tension component 200 is used for applying axial tension to the soil body sample 2, the radial pressure component 300 is used for applying radial pressure to the soil body sample 2, in the soil preparation component 400, the soil body sample 2 can be manufactured through the upper matching sleeve 410, the flap type side movable plate 420, the rubber film 430 and the lower matching sleeve 440, and the vertical fixing purpose of the soil body sample 2 can be realized by detaching the flap type side movable plate 420 and installing the flap type side movable plate 420 between the axial tension component 200 and the bottom plate 120, so that the strength characteristics of the soil body sample 2 under the stretching-compression coupling stress state can be intuitively observed and measured, and further the slope stability analysis theory under the earthquake action is perfected. In addition, since the soil making assembly 400 can make soil and fix the soil sample 2, the size of the soil sample 2 can be unified, more uniform soil strength can be obtained, and the upper and lower coupling sleeves 410 and 440 can uniformly stretch the soil sample 2, so that the rubber film 430 can be tightly attached to the soil sample 2, and the integrity of the soil sample 2 is ensured.
Referring to fig. 1 and 2, in some possible embodiments, the upper adapter sleeve 410, the lower adapter sleeve 440, and the flap-type side movable plate 420 together enclose an hourglass-shaped cavity with two thick ends and a thin middle. In the embodiment, the hourglass-shaped forming cavity with two thick ends and a thin middle part is shaped like a dorik column, and the soil body sample 2 with two thick ends and a thin middle part can be prepared, so that the soil body sample 2 is subjected to tensile failure in the middle part during a test, the tensile failure state can be controlled to be a pure tensile failure state, and the possibility of the soil body sample 2 being subjected to shear failure is reduced.
It will be appreciated that the flap side flap 420 and the upper and lower mating sleeves 410, 440 have a smooth transition in the inner side walls forming the hourglass shaped cavity. In addition, in order to improve the fitting reliability, the contact surfaces of the flap type side movable plate 420 and the upper and lower coupling sleeves 410 and 440 are disposed at an angle with respect to the axial direction, i.e., the contact area is increased.
Referring to fig. 2, in some possible embodiments, each flap-type side movable plate 420 is provided with a locking hole 450, and adjacent flap-type side movable plates 420 are detachably fitted with locking bolts in the corresponding locking holes 450. In this embodiment, the adjacent flap-type side movable plates 420 are fastened, fixed and detached by screw fastening, so that the assembling and disassembling speeds are faster, and the test time and the operation difficulty are reduced. It will be appreciated that each flap side movable plate 420 may be provided with a plurality of locking holes 450.
The specific structure of the upper and lower adapter sleeves 410, 440 is not limited, and will be exemplified below.
In some possible embodiments, the upper coupling sleeve 410 includes an upper cylinder detachably connected to the flap type side movable plate 420, and a cylinder top seat detachably connected to the upper cylinder, the cylinder top seat being detachably connected to the fixing clip seat. The lower coupling sleeve 440 includes a lower cylinder detachably connected to the flap type side movable plate 420, and a cylinder base 500 connected to the lower cylinder, the cylinder base 500 being detachably connected to the bottom plate 120.
Of course, the upper and lower coupling sleeves 410, 440 may be formed as a single piece, one-open, and other-closed tubular structure, or may be formed as a tubular structure with a mounting base according to the installation situation, but are not limited thereto.
The manner of engagement between the upper and lower coupling sleeves 410 and 440 and the flap type side movable plate 420 is not limited, and will be exemplified below.
In some possible embodiments, there are one or more of a screw fit, a snap fit, a pin fit between the upper mating sleeve 410 and the flap side movable plate 420, and between the lower mating sleeve 440 and the flap side movable plate 420. The above-mentioned coupling sleeve 410 and the flap type side movable plate 420 may be in a single or multiple fit manner, so as to achieve a firm reinforcement effect.
Specifically, an internal thread may be provided on the inner side wall of the upper coupling sleeve 410, an external thread may be provided on the outer side wall of the flap-type side movable plate 420, and the two may be engaged by screwing, however, the internal thread and the external thread may be interchanged. An elastic clamping block can be arranged on the upper coupling sleeve 410, a clamping groove is arranged on the flap-type side movable plate 420, and the matching relationship between the two can be realized in a clamping manner, so that the elastic clamping block and the clamping groove can be interchanged. Threaded holes may be provided in both the upper coupling sleeve 410 and the flap-type side movable plate 420, and the upper coupling sleeve and the flap-type side movable plate may be fixed by a stopper pin, thereby achieving a coupling relationship therebetween. The lower coupling sleeve 440 and the flap type side movable plate 420 are coupled in the same manner as the upper coupling sleeve 410 and the flap type side movable plate 420, and will not be described again. With such a configuration, the assembly and disassembly of the soil making assembly 400 can be simply and rapidly achieved.
Of course, in other possible embodiments, other mating methods may be used, and are not limited thereto.
Referring to fig. 1, in some possible embodiments, an axial tension assembly 200 includes: an axially fixed cartridge 210 removably coupled to the upper mating sleeve 410; an axial stress sensor 220 connected to the axial fixing holder 210; an axial displacement sensor 230 connected to the top plate 110; and an axial loading structure 240 connected with the axial stress sensor 220 and disposed in cooperation with the top plate 110.
Specifically, the axial fixation clamp 210 and the upper mating sleeve 410, and the bottom plate 120 and the lower mating sleeve 440 are each one or more of a threaded fit, a snap fit, and a pin fit. It will be appreciated that the axial fixing clip 210 and the upper coupling sleeve 410, and the bottom plate 120 and the lower coupling sleeve 440 may be engaged with each other in a single manner or in multiple manners, so as to achieve a firm reinforcement effect.
For example, the axial fixing holder 210 may have a hollow structure, an inner thread is disposed on an inner sidewall of the axial fixing holder 210, an outer thread is disposed on an outer sidewall of the upper coupling sleeve 410, and a connection relationship is achieved through a threaded engagement, and of course, the inner thread and the outer thread may be interchanged. The axial fixing socket 210 may also be provided with a groove, the upper mating sleeve 410 is provided with an elastic clamping block, and the connection relationship is realized by means of a buckle, and of course, the groove and the elastic clamping block may be interchanged. The axial fixing clip seat 210 and the upper coupling sleeve 410 may also be provided with threaded holes, and fixed by using a limiting pin, so as to achieve the matching relationship between the two. The lower coupling sleeve 440 may be fixed to the base plate 120 by fastening bolts 470, but may be fastened, limited, or the like, by means of a snap fit, a stopper pin, or the like between the upper coupling sleeve 410 and the axial fixing holder 210.
With such a configuration, the assembly and disassembly of the soil making assembly 400 can be simply and rapidly achieved. Of course, in other possible embodiments, other mating methods may be used, and are not limited thereto.
The axial stress sensor 220 may employ an S-type sensor for registering axial tension of the axial loading structure 240 during application of the axial tension. The axial displacement sensor 230 is used for recording the continuous displacement change of the soil body sample 2 in the axial direction during the axial pulling force applied by the axial loading structure 240. The axial loading structure 240 is used to apply an axial tensile force to the soil body sample 2, and it is understood that the axial tensile force is a tensile force in a vertical direction.
Based on the above description of the axial tension assembly 200, referring to fig. 1, in a specific embodiment, the axial tension assembly 200 further includes an axial sliding seat 250 cooperatively disposed with the axial loading structure 240, wherein the axial sliding seat 250 is capable of moving relative to the top plate 110 and being fixed in a target position. In this embodiment, the axial sliding seat 250 is used to adjust the installation and fixing position of the soil body sample 2, so as to ensure that the soil body sample 2 is kept in a vertical state, and prevent inaccuracy of measurement results caused by inclination.
It can be appreciated that the axial sliding seat 250 can be movably disposed on the top plate 110 by sliding fit, roller fit, etc., and the fixing effect at the target position can be achieved by the positioning bolts, the positioning claws, the positioning stoppers, etc.
For example, the top plate 110 is provided with an axial chute, the axial sliding seat 250 is penetrated in the axial chute, the axial loading structure 240 is partially matched in the axial chute, and the axial loading structure 240 extends out of the axial sliding seat 250 and is connected with the axial stress sensor 220 near one end of the bottom plate 120. It will be appreciated that the axial loading structure 240 is partially engaged with the axial sliding seat 250, and the force-applying end of the axial loading structure 240 extends out of the axial sliding seat 250 and is connected to the axial stress sensor 220, thereby applying an axial pulling force to the soil body sample 2. When the axial sliding seat 250 moves, the corresponding mating portions of the axial loading structure 240 move synchronously to ensure consistency.
In addition, the corresponding matched part of the axial loading structure 240 can integrally move in the axial direction relative to the axial sliding seat 250, so as to drive the axial stress sensor 220 and the axial fixing seat 210 to move in the axial direction, so as to record the continuous displacement change of the soil body sample 2, or the corresponding matched part of the axial loading structure 240 can generate the displacement change between the structures, so as to drive the axial stress sensor 220 and the axial fixing seat 210 to move in the axial direction, so as to record the continuous displacement change of the soil body sample 2 in the axial direction.
The axial sliding seat 250 and the axial loading structure 240 are not limited and are exemplified below.
For example, the axial sliding seat 250 has a hollow structure with two ends open and fitted in the axial sliding groove, and the cavity formed by the hollow structure is not limited in shape, and may be a cylinder, a prism, or the like. The axial loading structure 240 includes an axial pressurizing oil pump 241 mated with the axial sliding housing 250, an axial hydraulic oil pipe 242 communicating with the axial pressurizing oil pump 241, and an axial hydraulic oil cylinder 243 communicating with the axial hydraulic oil pipe 242. The axial pressurizing oil pump 241 has a force application end connected to the axial stress sensor 220, and the axial hydraulic cylinder 243 may be provided on the reaction frame 100, on the base 500, or at a position adjacent to the reaction frame 100 and the base 500, for providing hydraulic oil required for pulling force. In addition, the axial loading structure 240 may further include an axial manual crank connected to the axial hydraulic cylinder 243, so as to facilitate manual adjustment by a tester, or the axial loading structure 240 may further include an automatic pressing member connected to the axial hydraulic cylinder 243, so as to implement an automatic pressing effect according to a program setting rule.
Of course, the axial loading structure can also be in other forms, such as air bag pressurization, motor-driven pressurization, and the like.
Based on the description of the axial tension assembly 200, referring to fig. 1, in a specific embodiment, an axial positioning hole is formed in the range where the axial fixing socket 210 and the upper mating socket 410 are mated, an axial fixing latch 260 extending from the upper mating socket 410 and the axial fixing socket 210 is formed in the axial positioning hole, one end of the axial displacement sensor 230 is disposed on the top plate 110, and the other end is disposed on the axial fixing latch 260.
In the present embodiment, the mating manner of the axial fixing clip base 210 and the upper mating sleeve 410 is not limited. Axial positioning holes are formed in the wall thickness directions of the axial fixing clamping seat 210 and the upper matching sleeve 410, the axial positioning holes are aligned, an axial fixing plug 260 is detachably arranged in the axial positioning holes, and two ends of the axial displacement sensor 230 are respectively arranged between the top plate 110 and the axial fixing plug 260.
It should be understood that the direction of the opening of the axial positioning hole is radial, and this naming is merely for distinguishing the components included in the axial tension assembly 200 and the radial tension assembly, and does not represent the actual direction of the opening, and the meaning of the axial fixing pin 260, the radial positioning hole appearing below, the radial fixing pin 380, etc. are also similar, and will not be repeated herein.
In addition, the axial displacement sensor 230 may have two ends of its integral structure respectively disposed on the top plate 110 and the axial fixing pin 260, or may have two ends of its virtual path disposed on the top plate 110 and the axial fixing pin 260 respectively, which is not limited, so long as it is ensured that the axial displacement sensor 230 can accurately record the lifting displacement of the axial fixing pin 260 in the lifting process of the axial fixing pin 260, and the lifting displacement of the axial fixing pin 260 is the tensile displacement of the soil sample 2.
So configured, on the one hand, the axial retention latch 260 is capable of reinforcing the mating relationship of the axial retention mount 210 and the upper mating sleeve 410 to provide dual protection for improved retention reliability. On the other hand, the axial fixing pin 260 can assist the axial displacement sensor 230 to more accurately record the axial displacement change, and improve the accuracy of the detection result.
The specific composition of the radial pressure assembly 300 is not limited and is illustrated below.
Referring to fig. 1, in some possible embodiments, each radial pressure assembly 300 comprises: a flap type confining pressure movable plate 310, wherein the flap type confining pressure movable plates 310 of the plurality of radial pressure assemblies 300 enclose a wrapping cavity; the granular confining pressure filler 320 is arranged between the flap type confining pressure movable plate 310 and the soil body sample 2; the radial fixed clamping seat 330 is detachably connected with the flap type confining pressure movable plate 310; a radial stress sensor 340 connected to the radial fixing holder 330; a radial displacement sensor 350 connected to the side plate 130; and a radial loading structure 360 connected with the radial stress sensor 340 and arranged in cooperation with the side plate 130.
Specifically, the flap type confining pressure movable plates 310 may be provided with two or three or four, etc., and uniformly distributed around the soil body sample 2 to wrap the soil body sample 2. The granular confining pressure filler 320 can continuously fill the gap generated when the soil body sample 2 deforms by utilizing the fluidity of the granular confining pressure filler, and abandons the traditional mode of applying confining pressure by water without arranging a confining pressure chamber, thereby enabling the soil body sample 2 to be subjected to the effect of uniform radial pressure.
The matching manner of the radial fixing clip seat 330 and the flap type confining pressure movable plate 310 can refer to the matching manner of the axial fixing clip seat 210 and the upper matching sleeve 410, and will not be described herein.
The radial displacement sensor 350 is used to record the radial pressure of the radial loading structure 360 during the application of the radial pressure. The radial stress sensor 340 may be an S-type sensor for recording the continuous displacement change of the soil mass sample 2 in the radial direction during the application of the radial pressure by the radial loading structure 360. The radial loading structure 360 is used to apply radial pressure to the soil body sample 2, and it is understood that the radial pressure is the pressure in the horizontal direction.
Based on the description of radial pressure assembly 300 above, in one particular embodiment, granular confining pressure filler 320 includes: the confining pressure film is arranged on the flap type confining pressure movable plate 310, and a confining pressure cavity is formed between the confining pressure film and the flap type confining pressure movable plate 310; and fine sand is arranged in the confining pressure cavity and is used for applying confining pressure to the soil body sample 2.
Specifically, the confining pressure film can be fastened by adopting a rubber band, a rope and the like, and is used for preventing fine sand from leaking. The fine sand has good fluidity and incompressibility, the incompressibility of the fine sand is utilized to realize the uniform transmission of force, and the gap generated when the soil body sample 2 is deformed is continuously filled by the fluidity of the fine sand, so that the effect that the soil body sample 2 is subjected to uniform radial pressure is achieved. Compared with the traditional mode of applying confining pressure by water, a confining pressure chamber is not required to be arranged, and maintenance cost is reduced.
Of course, in other possible embodiments, if the flap-type confining pressure flap 310 is tightly attached to the soil body sample 2, the confining pressure membrane may not be provided. Other granular structures similar to the characteristic of fine sand can be used as confining pressure filling, and the confining pressure filling is not limited.
Based on the description of the radial pressure assembly 300 above, referring to FIG. 1, in one particular embodiment, the radial pressure assembly 300 further includes a radial slide seat 370 cooperatively disposed with the radial loading structure 360, the radial slide seat 370 being movable and fixed in a target position relative to the side plate 130. In this embodiment, the radial sliding seat 370 is utilized to adjust the installation and fixing position of the soil body sample 2, so as to ensure that the flap type confining pressure movable plate 310 is positioned at the preset position of the soil body sample 2 and ensure that the soil body sample 2 is always positioned in the vertical direction. The specific structure of the radial sliding seat 370, the matching manner with the side plate 130, and the matching manner with the radial loading structure 360 can refer to the axial sliding seat 250, and will not be described herein.
In addition, the radial loading structure 360 may refer to the axial loading structure 240, and specifically includes a radial pressurized oil pump 361, a radial hydraulic oil pipe 362, and a radial hydraulic oil cylinder 363, which are not described herein.
It will be appreciated that referring to fig. 1, in a specific embodiment, the plurality of radial loading structures 360 may share the same power source, that is, may share the same radial hydraulic cylinder 363, so that the forces applied by the plurality of radial loading structures 360 are the same, and the uniformity and consistency of the applied forces are ensured.
Based on the above description of the radial pressure assembly 300, referring to fig. 1, in a specific embodiment, a radial positioning hole is formed in the range where the radial fixing clamping seat 330 and the flap type confining pressure movable plate 310 are matched, the radial positioning hole is provided with a radial fixing plug 380 extending out of the radial fixing clamping seat 330 and the flap type confining pressure movable plate 310, and one end of the radial displacement sensor 350 is disposed on the side plate 130, and the other end is disposed on the radial fixing plug 380. It should be understood that the mating relationship of the radial fixing pins 380 is the same as the mating relationship of the axial fixing pins 260, and the difference is only that the mating objects are different, and will not be described herein.
On the basis of the above embodiment, in the test, the force can be applied to the axial pressurizing oil pump 241 by the hand-operated axial hydraulic oil cylinder 243, and the tensile force can be uniformly applied to the soil body sample 2 by the upper coupling sleeve 410; after the tension is stable, the hand-operated radial hydraulic cylinder 363 applies force to the radial pressurizing oil pump 361, the radial pressure transmits the pressure to the fine sand through the flap type confining pressure movable plate 310, and then the uniform confining pressure is applied to the circumferential profile of the soil body sample 2, so that the soil body sample 2 is subjected to the tension in the axial direction and simultaneously subjected to the pressure in the radial direction.
Based on the same inventive concept, the embodiment of the invention also provides a soil body stretching and compressing coupling test method, which adopts the soil body stretching and compressing coupling test device 1 according to any embodiment, and comprises the following steps:
soil preparation stage: the rubber film 430 is wrapped on the inner side of the flap type side movable plate 420, the flap type side movable plate 420 and the lower matching sleeve 440 are assembled, soil is filled in the formed forming cavity and compacted, the upper matching sleeve 410 is assembled, and the flap type side movable plate 420 is disassembled, so that the soil sample 2 is obtained.
In combination with the above embodiment of the soil body stretching compression coupling test device 1, specifically, in the first step, the rubber film 430 is reversely wrapped on the flap type side movable plate 420; and a second step of: the flap type side movable plate 420 is installed between the upper and lower coupling sleeves 410 and 440; thirdly, inserting an alignment bolt into the alignment hole 460 to ensure alignment and lamination between the flap type side movable plates 420; fourth, the locking bolt is screwed into the locking hole 450 and tightened; fifth, opening the upper coupling sleeve 410, putting the soil sample into the molding cavity and compacting; sixth, after the soil sample is compacted, the coupling sleeve 410 is assembled; seventh, the alignment pin is pulled out from the alignment hole 460, the locking bolt is screwed out from the locking hole 450, and the flap type side movable plate 420 is removed, so as to obtain the soil body sample 2 with the upper coupling sleeve 410, the lower coupling sleeve 440 and the rubber membrane 430.
Test stage: the soil making assembly 400 with the flap type side movable plate 420 and the soil body sample 2 are detached, the soil body sample 2 is assembled between the axial tension assembly 200 and the bottom plate 120 through the upper coupling sleeve 410 and the lower coupling sleeve 440, the axial tension assembly 200 is used for providing the tension in the vertical direction and recording the continuous displacement change and the tension of the soil body sample 2 in the vertical direction, the radial pressure assembly 300 is used for providing the pressure in the horizontal direction and recording the continuous displacement change and the pressure of the soil body sample 2 in the horizontal direction, the change curve of the displacement and the stress of the soil body sample 2 is drawn, and the strength of the soil body sample 2 under the tensile compression coupling effect is directly obtained.
Specifically, in the above embodiment of the soil body tensile compression coupling test apparatus 1, in the first step, the upper coupling sleeve 410 is connected to the axial fixing socket 210, and the lower coupling sleeve 440 is fixed to the bottom plate 120 of the reaction frame 100 by the fastening bolts 470; secondly, inserting an axial fixing plug 260 into the axial positioning holes of the upper coupling sleeve 410 and the axial fixing socket 210, placing the axial displacement sensor 230 on the axial fixing plug 260, and resetting the axial displacement sensor 230; thirdly, hydraulic oil is applied to the axial pressurizing oil pump 241 through the axial hydraulic oil cylinder 243 and the axial hydraulic oil pipe 242, a vertical pulling force is applied to the axial fixing clamping seat 210 through the axial pressurizing oil pump 241, and the axial fixing clamping seat 210 uniformly applies pulling force to the soil body sample 2 through the upper matching sleeve 410, so that a uniform pulling force effect on the soil body sample 2 is realized; fourth, the flap type confining pressure movable plate 310 is mounted on the radial fixing clamping seat 330, wherein the radial fixing clamping seat 330, the radial stress sensor 340, the radial displacement sensor 350 and the radial loading structure 360 can be mounted in advance or mounted in a later use, and then fine sand is slowly injected into a gap between the flap type confining pressure movable plate 310 and the soil body sample 2 and fills the gap; and fifthly, maintaining the tensile force unchanged, applying hydraulic oil to the radial pressurizing oil pump 363 through the radial hydraulic oil cylinder 363 and the radial hydraulic oil pipe 362, applying uniform radial pressure to the soil body sample 2 through the flap type confining pressure movable plate 310 and the fine sand until the soil body sample 2 breaks under the action of stretching-compressing coupling, recording the continuous displacement change of the soil body sample 2 through the axial displacement sensor 230 and the radial position sensor, recording the radial pressure in the process of constant tensile force through the axial stress sensor 220 and the radial stress sensor 340, drawing a change curve of the displacement and the stress of the soil body sample 2 according to the test result, and directly obtaining the strength of the soil body sample 2 under the action of stretching-compressing coupling.
It will be appreciated that the testing steps may be adjusted appropriately according to the fitting relationships and mounting relationships of the respective constituent structures, and testing operations may be performed by steps other than those described in the above embodiments.
The soil body stretching and compressing coupling test method provided by the embodiment of the invention adopts the soil body stretching and compressing coupling test device 1 in any embodiment, and the technical effects of the soil body stretching and compressing coupling test device and the soil body stretching and compressing coupling test device are the same, and are not repeated here.
It will be appreciated that the portions of the foregoing embodiments may be freely combined or omitted to form different combined embodiments, and the details of the respective combined embodiments are not described herein, so that after the description, the present disclosure may be considered as having described the respective combined embodiments, and the different combined embodiments can be supported.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (9)
1. Soil body tensile compression coupling test device, its characterized in that includes:
the reaction frame is provided with a top plate, a bottom plate and side plates which are opposite;
The axial tension component is matched with the top plate;
the radial pressure assemblies are matched with the side plates, are aligned in the axial direction and surround the side plates in the radial direction to form a wrapping cavity; and
the soil making assembly comprises an upper matching sleeve which is detachably connected with the axial tension assembly, at least two flap type side movable plates which are detachably connected with the upper matching sleeve, a rubber film which is detachably arranged on the inner side of the flap type side movable plates, and a lower matching sleeve which is detachably connected with the flap type side movable plates; the movable sleeve is formed by surrounding at least two flap type side movable plates into a circumferentially connected movable sleeve, each flap type side movable plate is provided with an alignment hole, the adjacent flap type side movable plates are detachably matched with alignment bolts in the corresponding alignment holes, and the lower matching sleeve is detachably connected with the bottom plate;
when a soil body sample is manufactured, the soil manufacturing assembly is detached from the axial tension assembly and the bottom plate to an independent state, and a forming cavity of the soil body sample is formed by the upper matching sleeve, the flap-type side movable plate, the rubber film and the lower matching sleeve;
During a tensile compression test, the soil making assembly is mounted between the axial tension assembly and the bottom plate through the upper matching sleeve and the lower matching sleeve, the flap type side movable plate is removed, the soil body sample is accommodated in the wrapping cavity, axial tension is applied through the axial tension assembly, and radial pressure is applied through the radial pressure assembly;
each of the radial pressure assemblies comprises:
the flap type confining pressure movable plates of the radial pressure assemblies are surrounded to form the wrapping cavity;
the granular confining pressure filler is arranged between the flap type confining pressure movable plate and the soil body sample;
the radial fixed clamping seat is detachably connected with the flap type confining pressure movable plate;
the radial stress sensor is connected with the radial fixing clamping seat;
a radial displacement sensor connected with the side plate; and
and the radial loading structure is connected with the radial stress sensor and is matched with the side plate.
2. The soil body stretching compression coupling test device according to claim 1, wherein the upper adapting sleeve, the lower adapting sleeve and the flap type side movable plate are enclosed together to form an hourglass-shaped cavity with two thick ends and a thin middle part.
3. The soil body tensile compression coupling test device of claim 1, wherein the axial tension assembly comprises:
the axial fixing clamping seat is detachably connected with the upper matching sleeve;
the axial stress sensor is connected with the axial fixing clamping seat;
an axial displacement sensor connected with the top plate; and
and the axial loading structure is connected with the axial stress sensor and is matched with the top plate.
4. The soil body stretching compression coupling test device of claim 3, wherein the axial tension assembly further comprises an axial sliding seat body cooperatively arranged with the axial loading structure, the axial sliding seat body being movable relative to the top plate and fixed at a target position.
5. The soil body stretching compression coupling test device according to claim 3, wherein an axial positioning hole which is aligned is formed in the matching range of the axial fixing clamping seat and the upper matching sleeve, an axial fixing bolt which extends out of the upper matching sleeve and the axial fixing clamping seat is arranged in the axial positioning hole, one end of the axial displacement sensor is arranged on the top plate, and the other end of the axial displacement sensor is arranged on the axial fixing bolt.
6. The soil body stretching compression coupling test device of claim 1, wherein the granular confining pressure filler comprises:
the confining pressure film is arranged on the flap type confining pressure movable plate, and a confining pressure cavity is formed between the confining pressure film and the flap type confining pressure movable plate; and
and the fine sand is arranged in the confining pressure cavity and is used for applying confining pressure to the soil body sample.
7. The soil body stretching compression coupling test device of claim 1, wherein the radial pressure assembly further comprises a radial sliding seat body cooperatively disposed with the radial loading structure, the radial sliding seat body being movable relative to the side plate and fixed in a target position.
8. The soil body stretching compression coupling test device according to claim 1, wherein a radial positioning hole which is aligned is formed in the matching range of the radial fixing clamping seat and the flap type confining pressure movable plate, a radial fixing bolt which extends out of the radial fixing clamping seat and the flap type confining pressure movable plate is arranged in the radial positioning hole, one end of the radial displacement sensor is arranged on the side plate, and the other end of the radial displacement sensor is arranged on the radial fixing bolt.
9. A soil body stretching and compressing coupling test method adopting the soil body stretching and compressing coupling test device as recited in any one of claims 1 to 8, characterized by comprising the following steps:
Soil preparation stage: wrapping the inner side of the flap type side movable plate with a rubber film, assembling the flap type side movable plate with a lower matching sleeve, filling soil in a formed forming cavity, compacting, assembling an upper matching sleeve, and disassembling the flap type side movable plate to obtain a soil sample;
test stage: the soil making assembly and the soil body sample of the flap type side movable plate are detached, the soil making assembly and the soil body sample are assembled between the axial tension assembly and the bottom plate through the upper adapting sleeve and the lower adapting sleeve, the axial tension assembly is used for providing tension in the vertical direction and recording continuous displacement change and tension of the soil body sample in the vertical direction, the radial tension assembly is used for providing pressure in the horizontal direction and recording continuous displacement change and pressure of the soil body sample in the horizontal direction, a change curve of the soil body sample displacement and stress is drawn, and the strength of the soil body sample under the tensile compression coupling effect is directly obtained.
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