CN111948377A - Rock-soil triaxial free expansion instrument - Google Patents
Rock-soil triaxial free expansion instrument Download PDFInfo
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- CN111948377A CN111948377A CN202010830018.XA CN202010830018A CN111948377A CN 111948377 A CN111948377 A CN 111948377A CN 202010830018 A CN202010830018 A CN 202010830018A CN 111948377 A CN111948377 A CN 111948377A
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
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Abstract
The invention discloses a rock-soil triaxial free expansion instrument, wherein a telescopic valve mould cylinder is arranged in the middle of a pressure chamber, a rubber film is wrapped outside a sample and sleeved in the telescopic valve mould cylinder, a bottom plate and a bottom permeable stone are sequentially stacked on a base, the bottom of the sample is supported on the bottom permeable stone, the top of the sample is sequentially pressed with a top permeable stone and a top plate, a top cover valve is arranged on the top cover and is connected with a piston through a piston spring, the bottom of the piston is in contact connection with the top plate, a top dial indicator is pressed on a top displacement rod through a top dial indicator support, displacement rings are symmetrically sleeved on the upper portion and the lower portion of the telescopic valve mould cylinder, the bottom of the valve cylinder is connected on the base in a sliding manner, and a bottom plate water-through valve, a top plate water-through valve and a base. The invention has simple structure, safety and stability, can play a good role in protecting the sample when the sample is saturated by water through the telescopic valve die cylinder, can flexibly adapt to the expansion deformation of the sample, and has high detection efficiency and accuracy.
Description
Technical Field
The invention relates to an dilatometer, in particular to a rock-soil triaxial free dilatometer.
Background
A triaxial test method is adopted for indoor testing of rock-soil mass in geotechnical engineering, a sample used in the triaxial test is generally cylindrical, so that a adopted triaxial sample saturator is generally cylindrical and is fixed and unchanged, the sample volume change is small after the general rock-soil mass is saturated by water, the general saturator can better meet the requirement of rock-soil mass saturation, but for rock-soil samples with high expansibility, such as expansive soil/rock, the expansive soil/rock is mainly composed of montmorillonite, the sample can generate obvious expansion deformation after being soaked by water, and generates larger expansion pressure for the saturator, the adoption of the general saturator can cause that the expansion form of the expansive soil/rock sample is radially restrained by the saturator to generate overlarge deformation in the axial direction, and the saturator is removed to restrain and eliminate the sample to generate certain expansion deformation, and the saturator can be damaged due to overlarge expansion force when the sample is saturated, if the sample is directly exposed and immersed in water for saturation without adopting the saturator, the expansive soil/rock sample is easy to expand, crack, even disintegrate and fall off, and the sample is easy to damage, so that the test fails. Therefore, a triaxial sample saturator is needed to be designed, which can not only ensure that the sample is well protected when being soaked in water and saturated, but also flexibly adapt to the expansion deformation generated by the sample, reasonably and truly detect the physical and mechanical characteristics of the sample, and has important significance for improving the efficient and accurate test quality of the expansive soil/rock.
Disclosure of Invention
The invention aims to solve the technical problem of providing a rock-soil triaxial free expansion instrument with simple structure, safety and stability, which can play a good role in protecting a sample when the sample is saturated by water through a telescopic flap mold cylinder, can flexibly adapt to expansion deformation generated by the sample, and improves the detection efficiency and accuracy.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows: a rock-soil triaxial free expansion instrument comprises a pressure chamber, wherein the pressure chamber comprises a base, a side cylinder and a top cover, pull rods are symmetrically arranged on the outer side of the side cylinder, the pull rods are matched with pull rod nuts through the upper end and the lower end of each pull rod and are respectively locked and fixed with the top cover and the base, the side cylinder is attached and fixed between the top cover and the base, a telescopic lamella mold cylinder is arranged in the middle of the side cylinder, a rubber membrane is wrapped on the outer side of a sample and sleeved in the telescopic lamella mold cylinder, a bottom plate and a bottom porous stone are sequentially stacked on the base, the bottom of the sample is supported on the bottom porous stone, a top porous stone and a top plate are sequentially pressed on the top of the sample, the upper end and the lower end of the rubber membrane are respectively bound on the outer sides of the top plate and the bottom plate, a piston and a top cover valve are arranged on the top cover, the piston is connected with the, the top amesdial support is fixed on the top cap, and the displacement ring has been cup jointed to the upper and lower portion symmetry of scalable lamella mould section of thick bamboo, and the bottom sliding connection of scalable lamella mould section of thick bamboo is on the base, and the side of base is provided with bottom plate valve of leading to water, roof valve of leading to water and base valve of leading to water, and bottom plate valve of leading to water, roof valve of leading to water and base valve of leading to water lead to water pipe and be linked together with bottom plate, roof and water tank respectively.
Further, scalable lamella mould section of thick bamboo includes three identical arc lamella moulds, arc lamella mould includes that arc lamella mould, symmetry set up arc recess, arc sand grip, arc steel sheet and the fixed block of upper and lower part in arc lamella mould, arc recess and arc sand grip set up respectively in the left and right ends of arc lamella mould, arc steel sheet rigid coupling just is inboard to the arc sand grip in arc lamella mould inside wall outer end, arc steel sheet length is not less than the arc sand grip, the fixed block sets up in the lateral wall left and right ends of arc lamella mould, and is provided with the spring hole of fixed spring and the bolt hole of fixing bolt on the fixed block, and adjacent arc lamella mould inserts through arc sand grip and arc recess and inlay and be connected and the adjacent fixed block of spring locking connection, and three arc lamella moulds assemble into cylindric hollow lamella mould section of thick bamboo that can stretch out and draw back inside and.
Further, the bottom of arc lamella mould is provided with the ball, ball roll connection is on the cushion, the cushion passes through the screw rigid coupling on the base in the bottom plate outside.
Further, the displacement ring is provided with outside portion and inside portion along the central line symmetry, outside portion and inside portion are connected with outer couple and interior couple respectively through elastic tension area, press through outside portion and establish in the inside portion outside and connect through outer couple and interior couple hook, the displacement ring cup joints on scalable lamella mould section of thick bamboo, the inside portion is provided with the scale mark, and according to the scale mark position change that outside portion outer end instructed, the inflation deformation that the circumference produced when can verifying the sample inflation.
Further, the side cylinder is a high-pressure-resistant transparent organic glass cylinder, and a side cylinder scale mark is arranged on the side cylinder and used for checking expansion deformation generated by the sample.
Further, a base sealing ring is arranged between the side cylinder and the base, a top cover sealing ring is arranged between the side cylinder and the top cover, and the pressure chamber is sealed through the base sealing ring and the top cover sealing ring.
Furthermore, a piston hole is formed in the top cover, and the piston penetrates through the piston hole and is connected to the top cover in a sealing mode through a piston sealing ring.
Furthermore, be provided with balanced drop of water on the pull rod outside base for whether the level is placed to the observation base, base bottom symmetry is provided with base adjusting bolt for adjust base to horizontality.
Further, the water tank is high pressure resistant transparent organic glass cylinder, suspends in midair on the water tank support through water tank load sensor, the water tank lateral wall is provided with the water tank scale mark for the change of check-up water tank water.
Further, the bottom plate is integrally connected to the base.
The invention has the following beneficial effects:
(1) the rock-soil triaxial free expansion instrument adopts a telescopic mould section cylinder to fix and restrain an expansive soil/rock sample, the telescopic mould section cylinder is formed by connecting three identical arc-shaped mould sections into an inner-outer telescopic mould section cylinder through springs, the adjacent arc-shaped mould sections are connected by the springs, so that good restraint and protection effects on the sample can be ensured, simultaneously, along with the expansion and deformation of the sample, the arc-shaped mould sections can be expanded along arc-shaped grooves of the arc-shaped mould sections in a self-adaptive manner, the arc-shaped steel sheets can avoid the situation that when the sample expands, gaps are formed between the adjacent arc-shaped mould sections when arc-shaped convex strips extend along the arc-shaped grooves, so that the sample is prevented from invading into the gaps, the continuity and the integrity of the sample in the process of soaking and saturation are ensured, therefore, the rock-soil triaxial free expansion instrument can play a good protection effect on the soaking and saturation of the rock-soil sample, and can effectively, a foundation is laid for accurately and efficiently developing a triaxial test;
(2) according to the invention, the expansion deformation of the sample in the axial direction in the water saturation process can be monitored through the top dial indicator, the piston and the top cover can be tightly connected through the upper end and the lower end of the piston spring respectively, so that the piston can be ensured to be tightly contacted with the top plate in the test process, and the expansion deformation of the sample in the axial direction can be really measured through the top dial indicator;
(3) in the sample saturation process, the top cover valve is closed, the base water passing valve, the bottom plate water passing valve and the top plate water passing valve are opened, water enters from the bottom plate water passing valve to saturate the sample, water exits from the top plate water passing valve, the volume expansion of the sample in the sample saturation process can be monitored through the water level change of the water tank, the expansion deformation of the sample in the radial direction can be further calculated, and the expansion deformation of the sample is monitored through the scale marks of the water tank and the scale marks of the side cylinder, so that the detection error is reduced, and the detection accuracy is improved;
(4) the rock-soil triaxial free expansion instrument plays a role of a saturator in a saturation test, and a conventional triaxial test can be carried out by detaching the telescopic petal cylinder after the saturation test is finished, so that the rock-soil triaxial free expansion instrument has double functions of the saturator and the triaxial instrument.
Drawings
FIG. 1 is a schematic structural view of a triaxial free-expansion instrument for rock and soil according to embodiment 1 of the present invention;
FIG. 2 is a top view of the collapsible petals of FIG. 1;
FIG. 3 is a schematic view of the petal of FIG. 2;
FIG. 4 is a schematic view of the displacement ring structure of FIG. 1;
fig. 5 is a schematic structural view of a triaxial free-expansion instrument for rock and soil according to embodiment 2 of the present invention.
Wherein the reference numerals are: the device comprises a base 1, a side cylinder 2, a side cylinder scale mark 2-1, a top cover 3, a pull rod 4, a pull rod nut 5, a sample 6, a rubber film 7, a bottom plate 8, a bottom pervious stone 9, a top pervious stone 10, a top plate 11, a piston 12, a top cover valve 13, a piston spring 14, a top displacement rod 15, a top dial indicator 16, a top dial indicator support 17, a displacement ring 18, an elastic tension belt 18-1, an outer hook 18-2, an inner hook 18-3, a scale mark 18-4, a bottom plate water-passing valve 19, a top plate water-passing valve 20, a base water-passing valve 21, a water tank 22, an arc-shaped flap mold 23-1, an arc-shaped groove 23-2, an arc-shaped convex strip 23-3, an arc-shaped steel sheet 23-4, a fixed block 23-5, a spring 23-6, a ball 24, a cushion block 25, a base sealing, Piston seal 29, balanced drop of water 30, base adjusting bolt 31, water tank load sensor 32, water tank support 33, water tank scale mark 34.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
Example 1
As shown in figure 1, the rock-soil triaxial free expansion instrument comprises a pressure chamber, the pressure chamber comprises a base 1, a side cylinder 2 and a top cover 3, pull rods 4 are symmetrically arranged on the outer side of the side cylinder 2, the side cylinder 2 is respectively locked and fixed with the top cover 3 and the base 1 through the upper end and the lower end of each pull rod 4 matched with a pull rod nut 5, the side cylinder 2 is fixedly attached between the top cover 3 and the base 1, a base sealing ring 26 is arranged between the side cylinder 2 and the base 1, a top cover sealing ring 27 is arranged between the side cylinder 2 and the top cover 3, the side cylinder 2 is a high-pressure-resistant transparent organic glass cylinder, a side cylinder scale 2-1 is arranged on the side cylinder 2 and used for checking expansion deformation generated by a sample 6, a telescopic flap mold cylinder is arranged in the middle part of the side cylinder 2, a rubber film 7 wrapped on the outer side of the sample 6 is sleeved in the telescopic flap mold cylinder, a bottom plate, the bottom of a sample 6 is supported on a bottom permeable stone 9, the top of the sample 6 is sequentially pressed with a top permeable stone 10 and a top plate 11, the upper end and the lower end of a rubber film 7 are respectively bound at the outer sides of the top plate 11 and a bottom plate 8, a top cover valve 13 and a piston hole 28 are arranged on the top cover 3, a piston 12 penetrates through the piston hole 28 and is hermetically connected to the top cover 3 through a piston sealing ring 29 (arranged together with a sealing ring of an oil cylinder or a jack), the piston 12 is connected with the top plate 11 through a piston spring 14, the piston 12 vertically penetrates through the top cover 3 downwards and is in contact connection with the top plate 11, a top displacement rod 15 is arranged on the piston 12, a top dial indicator 16 is pressed on the top displacement rod 15 through a top dial indicator support 17, the top dial indicator support 17 is fixed on the top cover 3, displacement rings 18 are symmetrically sleeved at the upper part and the lower part of a telescopic die, cushion 25 passes through the screw rigid coupling on base 1 in the bottom plate 8 outside, be provided with balanced drop of water 30 on the 4 outside bases 1 of pull rod, 1 bottom symmetry of base is provided with base adjusting bolt 31, the side of base 1 is provided with bottom plate logical water valve 19, roof logical water valve 20 and base logical water valve 21, bottom plate logical water valve 19, roof logical water valve 20 and base logical water valve 21 lead to pipe respectively with bottom plate 8, roof 11 and water tank 22 are linked together, water tank 22 is high pressure resistant transparent organic glass drum, suspend in midair on water tank support 33 through water tank load sensor 32, water tank 22 lateral wall is provided with water tank scale mark 34, a change for checking up water tank 22 water.
As shown in figures 2 and 3, the retractable split mold cylinder comprises three identical arc-shaped split molds, each arc-shaped split mold comprises an arc-shaped split mold 23-1, arc-shaped grooves 23-2, arc-shaped convex strips 23-3, arc-shaped steel sheets 23-4 and a fixed block 23-5, the arc-shaped grooves 23-2 and the arc-shaped convex strips 23-3 are symmetrically arranged at the upper part and the lower part of the arc-shaped split mold 23-1 respectively, the arc-shaped steel sheets 23-4 are fixedly connected at the outer ends of the inner side walls of the arc-shaped split mold 23-1 and are right opposite to the inner sides of the arc-shaped convex strips 23-3, the length of the arc-shaped steel sheets 23-4 is not less than that of the arc-shaped convex strips 23-3, the fixed block 23-5 is arranged at the left end and the right end of the outer side walls of the arc, the adjacent arc petals are connected with the arc grooves 23-2 in an inserting and embedding manner through the arc convex strips 23-3, the springs 23-6 are connected with the adjacent fixed blocks 23-5 in a locking manner, and the three arc petals are assembled into the hollow cylindrical petal barrel capable of stretching inside and outside.
As shown in FIG. 4, the displacement ring 18 is symmetrically provided with an outer side part and an inner side part along a midline, the outer side part and the inner side part are respectively connected with an outer hook 18-2 and an inner hook 18-3 through an elastic tension belt 18-1, the outer side part is pressed on the outer side of the inner side part and is connected with the inner hook 18-2 and the inner hook 18-3 in a hooking way, the displacement ring 18 is sleeved on the telescopic split mold cylinder, the inner side part is provided with a scale mark 18-4, and the expansion deformation generated by the circumference when the sample expands can be verified according to the position change of the scale mark indicated by the outer end of the outer side part.
Furthermore, the displacement ring 18 is made of PP materials and is similar to a tape for measuring waistline and other dimensions, the inner and outer elastic tension bands 18-1 are matched with the outer hook 18-2 and the inner hook 18-3 to fasten the displacement ring 18 on the outer side of the telescopic valve mold cylinder, and the outer diameter dimension of the sample before and after expansion deformation is determined through the position of a scale mark 18-4 corresponding to the tail end of the outer side of the displacement ring 18.
The rock-soil triaxial free expansion instrument has the following working process:
s1, observing the balance water drops 30, and rotating the base adjusting bolt 31 to adjust the base 1 to be in a horizontal state so as to ensure the stable placement of the rock-soil triaxial free expansion instrument;
s2, respectively connecting the top cover valve 13, the bottom plate water passing valve 19 and the top plate water passing valve 20 with external water sources through water pipes;
s3, when the rock-soil three-axis free expansion tester is used, the base water-passing valve 21 is closed, the bottom plate water-passing valve 19, the top plate water-passing valve 20 and the top cover valve 13 are opened (no water is injected at this moment), water is injected into the pressure chamber through the top cover valve 13 until the pressure chamber of the rock-soil three-axis free expansion tester is filled with water, then the top cover valve 13 is closed, the water tank 22 is connected with the base water-passing valve 21, the base water-passing valve 21 is opened, the height of the water tank 22 is adjusted to ensure that the water level in the water tank 22 is slightly higher than the highest position of the water in the pressure chamber, the piston spring 14 between the top cover 3 and the piston 12 is checked to be in a stretching state to ensure that the top plate 11 is in close contact with;
s4, after the preparation is finished, recording initial readings of the top dial indicator 16, the side cylinder scale 2-1, the water tank load sensor 32 and the water tank scale 34 respectively;
s5, the sample is saturated by water entering from the bottom plate water inlet valve 19 until the sample is soaked in water and expansion deformation is stable, the expansion deformation of the top plate 11 at different water inlet moments is measured, and the vertical upward expansion deformation of the top is obtained by calculation of the top dial indicator 16; the water change in the water tank 22 is measured by the water tank load sensor 32, the volume expansion deformation of the sample and the radial deformation of the triaxial sample are further calculated, the water change in the water tank 22 is verified by the water tank scale mark 34, and the expansion deformation generated by the sample is verified by the side barrel scale mark 2-1.
The volume expansion deformation of the sample is equal to the sum of the water inlet volume of the water tank 22 and the upward extension volume of the piston 12, wherein the water inlet volume of the water tank 22 is obtained by dividing the weight increment of the water tank 22 measured by the water tank load sensor 32 by the density of water, and the upward extension volume of the piston 12 is obtained by multiplying the upward extension displacement of the piston 12 by the sectional area of the piston 12; dividing the volume of the sample after the sample is soaked and expanded by the height of the sample after the sample is soaked and expanded to obtain the sectional area of the sample after the sample is soaked and expanded, and calculating the radius or the diameter of the sample after the sample is soaked and expanded according to the sectional area of the sample after the sample is soaked and expanded, so that the radial deformation of the sample before and after soaking can be calculated;
further, in the detection process, if the water is excessively supplied into the water tank 22, the water tank load sensor 32 is damaged and can be observed by the water tank scale mark 34, so that the error of the measured value is avoided.
Example 2
As shown in fig. 5, based on the rock-soil triaxial dilatometer of embodiment 1, after the saturation of the sample is completed, the base water valve 21 is closed, the top cover valve 13 is opened (no water injection at this time), the pull rod nut 5 on the top cover 3 is loosened, the piston 12, the top displacement rod 15, the top dial gauge 16 and the top displacement rod support 17 on the top cover 3 and the top cover 3 are dismounted, the telescopic split-die cylinder in the pressure chamber is dismounted and taken out, the displacement rings 18 are symmetrically sleeved on the upper and lower parts of the rubber membrane 7 on the outer side of the sample, the piston 12, the top displacement rod 15, the top dial gauge 16 and the top displacement rod support 17 on the top cover 3 and the top cover 3 are remounted, the upper end of the pull rod 4 is fixed on the top cover 3 through the pull rod nut 5, a water body is filled into the pressure chamber of the triaxial dilatometer from one top cover valve 13, all the top cover valves 13 are closed after the, at the moment, saturated samples required by triaxial consolidation and loading tests are prepared, and the subsequent triaxial test consolidation, loading and the like can complete the expansive soil/rock saturation test and the triaxial test without disturbance under the condition of not moving the saturated samples according to a common triaxial test method.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (10)
1. The rock-soil triaxial free expansion instrument comprises a pressure chamber and is characterized in that the pressure chamber comprises a base (1), side cylinders (2) and a top cover (3), pull rods (4) are symmetrically arranged on the outer sides of the side cylinders (2), the pull rods (4) are matched with pull rod nuts (5) through the upper ends and the lower ends of the pull rods (4) to be respectively locked and fixed with the top cover (3) and the base (1), the side cylinders (2) are fixedly attached between the top cover (3) and the base (1), the middle parts of the side cylinders (2) are provided with telescopic flap mold cylinders, rubber membranes (7) are wrapped on the outer sides of samples (6) and sleeved in the telescopic flap mold cylinders, the base (1) is sequentially stacked with a bottom plate (8) and a bottom permeable stone (9), the bottoms of the samples (6) are supported on the bottom permeable stone (9), the tops of the samples (6) are sequentially pressed with a top permeable stone (10) and a top plate (11), and the upper ends and lower ends of the rubber membranes (7) are respectively bound on, be provided with piston (12) and top cap valve (13) on top cap (3), be connected through piston spring (14) between piston (12) and roof (11), piston (12) is vertical to run through top cap (3) downwards, is connected with roof (11) contact, set up top displacement pole (15) on piston (12), top amesdial (16) are through top amesdial support (17) crimping on top displacement pole (15), top amesdial support (17) are fixed on top cap (3), displacement ring (18) have been cup jointed to the upper and lower symmetry of scalable lamella mould section of thick bamboo, the bottom sliding connection of scalable lamella mould section of thick bamboo is on base (1), the side of base (1) is provided with bottom plate logical water valve (19), roof logical water valve (20) and base logical water valve (21), bottom plate logical water valve (19), The top plate water passing valve (20) and the base water passing valve (21) are respectively communicated with the bottom plate (8), the top plate (11) and the water tank (22) through water pipes.
2. The triaxial free expansion instrument of rock and soil of claim 1, wherein: the telescopic petal mould cylinder comprises three identical arc petal moulds, each arc petal mould comprises an arc petal mould (23-1), arc grooves (23-2) symmetrically arranged at the upper part and the lower part of the arc petal mould (23-1), arc convex strips (23-3), arc steel sheets (23-4) and fixed blocks (23-5), the arc grooves (23-2) and the arc convex strips (23-3) are respectively arranged at the left end and the right end of the arc petal mould (23-1), the arc steel sheets (23-4) are fixedly connected at the outer end of the inner side wall of the arc petal mould (23-1) and are right opposite to the inner side of the arc convex strips (23-3), the length of the arc steel sheets (23-4) is not less than that of the arc convex strips (23-3), and the fixed blocks (23-5) are arranged at the left end and the right end of the outer side wall of the arc, and the fixing block (23-5) is provided with a spring hole for fixing the spring (23-6) and a bolt hole for fixing the bolt, adjacent arc-shaped petals are connected with the arc-shaped groove (23-2) in an inserting and embedding manner through arc-shaped convex strips (23-3), the spring (23-6) is connected with the adjacent fixing block (23-5) in a locking manner, and the three arc-shaped petals are assembled into a hollow cylindrical petal cylinder which can be stretched inside and outside.
3. The triaxial free expansion instrument of rock and soil of claim 2, characterized in that: the bottom of arc lamella mould is provided with ball (24), ball (24) roll connection is on cushion (25), cushion (25) pass through the screw rigid coupling on base (1) in bottom plate (8) outside.
4. The triaxial free expansion instrument of rock and soil of claim 3, characterized in that: the displacement ring (18) is symmetrically provided with an outer side part and an inner side part along a central line, the outer side part and the inner side part are respectively connected with an outer hook (18-2) and an inner hook (18-3) through elastic tension bands (18-1), the outer side part and the inner side part are arranged on the outer side of the inner side part in a pressing mode and connected through the outer hook (18-2) and the inner hook (18-3) in a hooking mode, the displacement ring (18) is sleeved on the telescopic flap mold cylinder, and the inner side part is provided with scale marks (18-4).
5. The geotechnical triaxial free expansion instrument according to claim 4, wherein: the side cylinder (2) is a high-pressure-resistant transparent organic glass cylinder, and a side cylinder scale mark (2-1) is arranged on the side cylinder (2) and used for checking expansion deformation generated by the sample (6).
6. The triaxial free expansion instrument of rock and soil of claim 5, characterized in that: a base sealing ring (26) is arranged between the side cylinder (2) and the base (1), and a top cover sealing ring (27) is arranged between the side cylinder (2) and the top cover (3).
7. The triaxial free expansion instrument of rock and soil of claim 6, wherein: a piston hole (28) is formed in the top cover (3), and the piston (12) penetrates through the piston hole (28) and is connected to the top cover (3) in a sealing mode through a piston sealing ring (29).
8. The triaxial free expansion instrument of rock and soil of claim 7, wherein: the water-saving device is characterized in that a balance water drop (30) is arranged on the base (1) on the outer side of the pull rod (4), and base adjusting bolts (31) are symmetrically arranged at the bottom of the base (1).
9. The triaxial free expansion instrument of rock and soil of claim 8, wherein: the water tank (22) is a high-pressure-resistant transparent organic glass cylinder and is suspended on the water tank support (33) through a water tank load sensor (32), and the side wall of the water tank (22) is provided with a water tank scale mark (34) for checking the change of a water body of the water tank (22).
10. The triaxial free expansion instrument of rock and soil of claim 9, wherein: the bottom plate (8) is integrally connected to the base (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010830018.XA CN111948377B (en) | 2020-08-18 | 2020-08-18 | Rock-soil triaxial free expansion instrument |
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| CN202010830018.XA CN111948377B (en) | 2020-08-18 | 2020-08-18 | Rock-soil triaxial free expansion instrument |
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| CN111948377B CN111948377B (en) | 2023-02-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112595284A (en) * | 2021-03-04 | 2021-04-02 | 山东胜工检测技术有限公司 | Special calibration device for shale dilatometer and installation method thereof |
| CN113686259A (en) * | 2021-09-14 | 2021-11-23 | 中国科学院武汉岩土力学研究所 | Soil body expansion and shrinkage measuring method and device under confining pressure control condition |
| CN117233035A (en) * | 2023-11-10 | 2023-12-15 | 寿光市勘察设计院有限责任公司 | Sample density testing system for rock-soil investigation test |
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| CN117233035A (en) * | 2023-11-10 | 2023-12-15 | 寿光市勘察设计院有限责任公司 | Sample density testing system for rock-soil investigation test |
| CN117233035B (en) * | 2023-11-10 | 2024-01-30 | 寿光市勘察设计院有限责任公司 | Sample density testing system for rock-soil investigation test |
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