CN113624591A - Direct shear tester - Google Patents
Direct shear tester Download PDFInfo
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- CN113624591A CN113624591A CN202111037921.1A CN202111037921A CN113624591A CN 113624591 A CN113624591 A CN 113624591A CN 202111037921 A CN202111037921 A CN 202111037921A CN 113624591 A CN113624591 A CN 113624591A
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- 238000011068 loading method Methods 0.000 claims abstract description 47
- 238000010008 shearing Methods 0.000 claims abstract description 39
- 238000012360 testing method Methods 0.000 abstract description 25
- 239000000463 material Substances 0.000 abstract description 19
- 239000002689 soil Substances 0.000 abstract description 14
- 239000011435 rock Substances 0.000 abstract description 6
- 238000005520 cutting process Methods 0.000 description 10
- 238000005096 rolling process Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000009826 distribution Methods 0.000 description 3
- 238000013142 basic testing Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229940099259 vaseline Drugs 0.000 description 1
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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
- G01N3/02—Details
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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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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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
- G01N2203/0025—Shearing
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The application provides a direct shear tester, relates to the test equipment field. The direct shear tester comprises a first shear box, a second shear box, a first driving mechanism and a second driving mechanism, wherein an opening of the first shear box is opposite to an opening of the second shear box in a first direction, the first driving mechanism is used for driving the first shear box to move in a second direction, the second direction is perpendicular to the first direction, and the second driving mechanism is used for driving the second shear box to move in the first direction. The second driving mechanism comprises a second driving piece and a loading plate, one surface of the loading plate is slidably connected with the outer side of the bottom of the second shearing box, and the other surface of the loading plate is rotatably connected with the output end of the second driving piece. The direct shear tester can ensure that the stress between the rock and soil materials in the second shear box and the rock and soil materials in the first shear box is uniform, and ensure the accuracy of the direct shear test result.
Description
Technical Field
The application relates to the field of test equipment, in particular to a direct shear tester.
Background
The strength index is the most basic mechanical index in geotechnical engineering analysis, and the direct shear test is one of the basic tests for determining the strength index of geotechnical materials. The traditional direct shear tester is easy to have the problem of uneven normal stress distribution in the shearing process, and finally the test result is not accurate enough.
Disclosure of Invention
The purpose of the application includes, for example, providing a direct shear tester, which can improve the problem of uneven normal stress distribution, so that the test result is more accurate.
The embodiment of the application can be realized as follows:
in a first aspect, the application provides a direct shear tester, which includes a first shear box, a second shear box, a first driving mechanism and a second driving mechanism, wherein an opening of the first shear box is opposite to an opening of the second shear box in a first direction, the first driving mechanism is used for driving the first shear box to move in a second direction, the second direction is perpendicular to the first direction, and the second driving mechanism is used for driving the second shear box to move in the first direction;
the second driving mechanism comprises a second driving piece and a loading plate, one surface of the loading plate is slidably connected with the outer side of the bottom of the second shearing box, and the other surface of the loading plate is rotatably connected with the output end of the second driving piece.
In an alternative embodiment, the load plate abuts against the bottom outside of the second shear box by means of rollers, so that the load plate is slidable in the second direction relative to the second shear box.
In an alternative embodiment, the output end of the second drive is connected to the load plate via a ball head, so that the load plate can be rotated in a plurality of directions relative to the output end of the second drive.
In an alternative embodiment, the projection of the opening of the second shear box in the first direction falls into the opening of the first shear box.
In an alternative embodiment, the direct shear tester further comprises a holding member for holding the second shear box to limit the second shear box from moving in the second direction.
In an alternative embodiment, the abutment is connected to an outer wall of the second shear box by a bearing so that the second shear box is slidable in the first direction relative to the abutment.
In an alternative embodiment, the second cutting box comprises a bottom plate, a surrounding plate and a side plate, the surrounding plate is detachably connected to the edge of the bottom plate, one end of the side plate is detachably connected to the end, away from the bottom plate, of the surrounding plate, the other end of the side plate extends towards the outer side of the second cutting box, the side plate is perpendicular to the first direction, and the side plate and the opening of the second cutting box can jointly cover the opening of the first cutting box.
In an optional embodiment, the enclosing plate is provided with a screw hole, the side plate is attached to the outer side of the enclosing plate, and the detachable connection of the side plate and the enclosing plate is realized through the matching of the screw hole on the screw and the enclosing plate.
In an alternative embodiment, a sliding assembly is arranged on the outer side of the bottom of the first shearing box, and the first shearing box is abutted to the supporting surface through the sliding assembly and can slide in the second direction relative to the supporting surface.
In an alternative embodiment, the first driving mechanism comprises a first driving member and a pull rod, an output end of the first driving member is connected with one end of the pull rod through a first pull ring, and the other end of the pull rod is connected with an outer wall of the first shear box through a second pull ring.
The beneficial effects of the embodiment of the application include, for example:
the direct shear tester provided by the embodiment of the application comprises a first shear box, a second shear box, a first driving mechanism and a second driving mechanism, wherein an opening of the first shear box is opposite to an opening of the second shear box in a first direction, the first driving mechanism is used for driving the first shear box to move in a second direction, the second direction is perpendicular to the first direction, and the second driving mechanism is used for driving the second shear box to move in the first direction. The second driving mechanism comprises a second driving piece and a loading plate, one surface of the loading plate is slidably connected with the outer side of the bottom of the second shearing box, and the other surface of the loading plate is rotatably connected with the output end of the second driving piece. When the first driving mechanism drives the first shearing box to move in the second direction relative to the second shearing box, the geotechnical materials in the first shearing box and the second shearing box shear and slide at the openings of the two shearing boxes. The pressure in the first direction output by the second driving piece is transmitted to the loading plate, then transmitted to the second shearing box and finally transmitted to the rock and soil materials in the second shearing box. Because the output end of the second driving piece is rotatable with the loading plate, and the loading plate is in sliding connection with the outer side of the bottom of the second shearing box, even if the second shearing box slightly inclines, the loading plate can also rotate slightly adaptively, so that the loading plate uniformly rotates towards the outer side of the bottom of the second shearing box, the stress between the rock and soil materials in the second shearing box and the rock and soil materials in the first shearing box is also ensured to be uniform, and the accuracy of the direct shearing test result is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic view of a direct shear tester according to an embodiment of the present application after loading a test sample therein;
fig. 2 is a schematic diagram of a direct shear test process using a direct shear tester according to an embodiment of the present application.
Icon: 010-direct shear tester; 100-a first shear box; 110-a slide assembly; 200-a first driving member; 210-a pull rod; 220-a first tab; 230-a second tab; 300-a second shear box; 310-a backplane; 320-enclosing plates; 330-side plate; 340-screws; 400-a second driver; 410-ball head; 420-a loading plate; 430-rolling member; 500-a holding member; 510-a bearing; 020-sample.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which the present invention product is usually put into use, it is only for convenience of describing the present application and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present application.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present application may be combined with each other without conflict.
The strength index is the most basic mechanical index in geotechnical engineering analysis, and the direct shear test is one of the basic tests for determining the strength index of geotechnical materials. The existing direct shear tester is used for loading a rock-soil material to be tested into an upper shearing box and a lower shearing box with opposite openings, then certain extrusion force is applied to the two shearing boxes, and meanwhile, the two shearing boxes are pushed (pulled) to enable one shearing box to slide relative to the other shearing box in the direction perpendicular to the extrusion direction, so that the rock-soil material in the two shearing boxes is subjected to shear sliding, the shear stress of the rock-soil material is calculated by detecting the pushing (pulling) force, and the strength of the rock-soil material is judged. In the shearing process of the traditional direct shear tester, a driving piece is used for applying normal load (the normal load is consistent with the opening direction of a shearing box), but force is transmitted to the shearing box and then transmitted to a rock-soil material, and the shearing box possibly inclines slightly, so that the normal stress distribution at the shearing surface is uneven finally, and the test result is not accurate enough.
In order to improve the problem that normal stress at the shearing surface is unevenly distributed in the prior art, the embodiment of the application provides a direct shear tester, and the normal stress of the rock-soil material at the shearing surface is more uniform by specially designing a transmission structure between a driving mechanism and a shearing box.
FIG. 1 is a schematic view of a direct shear tester 010 having a test piece 020 according to an embodiment of the present application; fig. 2 is a schematic diagram of a direct shear test process performed by the direct shear tester 010 according to an embodiment of the present application. Referring to fig. 1 and 2, the direct shear tester 010 of the present embodiment includes a first shear box 100, a second shear box 300, a first driving mechanism, and a second driving mechanism. The opening of the first shear box 100 is opposed to the opening of the second shear box 300 in a first direction (a direction in the drawing), and the first drive mechanism is used to drive the first shear box 100 to move in a second direction (b direction in the drawing) perpendicular to the first direction, and the second drive mechanism is used to drive the second shear box 300 to move in the first direction. As shown in fig. 1 and 2, the first direction may be a vertically downward direction, and the second direction may be a horizontal direction.
In this embodiment, the first driving mechanism and the second driving mechanism are disposed on a supporting surface, and the supporting surface is a surface that remains stationary during the direct shear test, and may be formed by a ground surface, a wall surface, or a fixed bracket.
In this embodiment, the first shear box 100 has its opening facing upward and its bottom facing downward, and the second shear box 300 has its opening facing downward and its bottom facing upward, so that the openings of the first shear box 100 and the second shear box 300 are opposite to each other. The opening of the first shear box 100 and the opening of the second shear box 300 are substantially in the same plane (may have a small difference in height), and when the first shear box 100 and the second shear box 300 are filled with a sample 020 (such as geotechnical material) for direct shear test, the shear plane is located on the plane where the openings of the two shear boxes are located. In this embodiment, the cut plane is horizontal.
In the present embodiment, the first shear box 100 is an integrally formed box body, and the opening of the first shear box 100 is larger than the opening of the second shear box 300, so that a projection of the opening of the second shear box 300 in the first direction falls into the opening of the first shear box 100. The opening of the first shear box 100 is larger than the opening of the second shear box 300, so that the size of the shear plane of the sample 020 can be kept unchanged at least in one stroke when the first shear box 100 slides in the second direction relative to the second shear box 300, the shear force can be kept relatively stable, and the shear stress calculated by the shear force and the shear plane area is more accurate.
In this embodiment, the first drive mechanism pulls the first shear box 100 to move in the second direction by providing a pulling force to the first shear box 100. The pulling force of the first shear box 100 by the first collection drive mechanism can be used to represent the shear force of the sample 020 at the shear plane. Of course, in order to enable the pulling force of the first driving mechanism to more accurately represent the shearing force, it is necessary to ensure that the pulling force direction of the first driving mechanism is consistent with the second direction, and to make the resistance between the first shear box 100 and the supporting surface as small as possible.
In order to reduce the resistance to movement of the first shear box 100 (particularly to the support surface), in an alternative embodiment, a sliding assembly 110 is provided on the outside of the bottom of the first shear box 100, and the first shear box 100 abuts the support surface via the sliding assembly 110 and is slidable in the second direction relative to the support surface. Specifically, the sliding assembly 110 may include a sliding rail extending along the second direction and a pulley engaged with the sliding rail, and the sliding assembly 110 may also include a plurality of rollers arranged along the second direction.
Further, in this embodiment, the first driving mechanism includes a first driving member 200 and a pull rod 210, an output end of the first driving member 200 is connected to one end of the pull rod 210 through a first pull ring 220, and the other end of the pull rod 210 is connected to an outer wall of the first shear box 100 through a second pull ring 230. The driving member, the pull rod 210 and the first shear box 100 are connected through the pull ring, so that the joint has certain flexibility, and unnecessary stress influence on the test effect is avoided.
Alternatively, the first driving member 200 may be a motor, a cylinder, a hydraulic cylinder, and various types of jacks. In this embodiment, the first driving member 200 provides a pulling force, and in an alternative embodiment, the first driving member 200 may also provide a pushing force.
In the present embodiment, the second driving mechanism includes a second driving member 400 and a loading plate 420, and one surface of the loading plate 420 is slidably coupled to the bottom outside of the second shear box 300 and the other surface thereof is rotatably coupled to the output end of the second driving member 400. In this embodiment, the second driving member 400 may be a motor, a cylinder, a hydraulic cylinder, and various types of jacks.
In the present embodiment, the loading plate 420 abuts against the bottom outside of the second shear box 300 through the rolling members 430, so that the loading plate 420 can slide in the second direction with respect to the second shear box 300. Specifically, the rolling member 430 may be a roller, and a plurality of rollers are arranged in parallel at intervals in the second direction; the rolling members 430 may also be rollers, ball bearings, or the like. The rolling member 430 may be provided on the loading plate 420 or may be provided outside the bottom of the second shear box 300 as long as it is possible to transmit the pressure applied by the loading plate 420 to the second shear box 300.
The force transmission between the loading plate 420 and the second shear box 300 is realized through the rolling members 430, so that a certain flexibility exists between the loading plate 420 and the second shear box 300, and the slight deviation of the second shear box 300 does not cause stress in other directions to be generated between the loading plate 420 and the second shear box 300, thereby ensuring that the pressure transmitted by the loading plate 420 to the bottom of the second shear box 300 is always vertical to the loading plate 420.
Further, the output end of the second driver 400 is connected to the loading plate 420 through the ball 410, such that the loading plate 420 can rotate in a plurality of directions with respect to the output end of the second driver 400. It will be appreciated that the output end of the second driver 400 is limited to movement in a first direction (including the opposite direction), and the ball 410 allows the loading plate 420 a greater degree of freedom relative to the output end of the second driver 400, avoiding a slight deflection of the loading plate 420 (which may be caused by an uneven bottom of the second shear box 300, tilting of the second shear box 300, etc.) resulting in greater stress between the output end of the driver and the loading plate 420, and also avoiding the loading plate 420 being subjected to forces that force it to have a tendency to rotate in addition to thrust forces, thus ensuring that the forces output to the second shear box 300 at various locations on the loading plate 420 are uniform.
In this embodiment, the output end of the second drive 400 is connected to the load plate 420 at the geometric center thereof, and the output end is aligned with the geometric center of the second shear box 300 as much as possible, so that the load force is not eccentric as much as possible.
As shown in fig. 1 and 2, the direct shear tester 010 further includes a holding member 500, and the holding member 500 is configured to hold the second shear box 300 to limit the second shear box 300 from moving in the second direction. Specifically, the supporting member 500 is a rod, one end of which is abutted against the supporting surface, and the other end of which is abutted against the second cutting box 300. The extending direction of the holding member 500 is the same as the second direction. Preferably, the extension line of the supporting member 500 passes through the geometric center of the second cutting box 300, so that it is ensured that the second cutting box 300 is not easily deflected during the direct cutting test as much as possible.
In an alternative embodiment, the retainer 500 is connected to the outer wall of the second shear box 300 by a bearing 510 so that the second shear box 300 can slide in the first direction relative to the retainer 500. Because the height of the second shear box 300 may change to some extent during the direct shear test, the bearing 510 connects the outer wall of the second shear box 300, so that the supporting force of the supporting member 500 on the second shear box 300 is always perpendicular to the outer wall, the force of the supporting member 500 on the second shear box 300 in the first direction (or the opposite direction) is reduced as much as possible, and the test accuracy is ensured. Of course, in alternative embodiments, the bearing 510 may be replaced with a general roller; the shape of the holding member 500 may be other than a rod shape, and may be designed as needed.
In this embodiment, the second shear box 300 includes a bottom plate 310, a shroud 320, and a side plate 330, the shroud 320 being detachably connected to an edge of the bottom plate 310, one end of the side plate 330 being detachably connected to an end of the shroud 320 remote from the bottom plate 310, the other end of the side plate 330 extending to an outside of the second shear box 300, the side plate 330 being perpendicular to the first direction, and the side plate 330 and an opening of the second shear box 300 being capable of collectively covering the opening of the first shear box 100. In the test preparation phase, during the loading of the sample 020, the edge plate 330 is kept connected with the surrounding plate 320, and the bottom plate 310 is detached, so that the sample 020 can be loaded from the bottom of the second shear box 300 (no opening is formed by the bottom plate 310), and the edge plate 330 covers the edge of the first shear box 100, so that the sample 020 is ensured not to overflow from the edge of the first shear box 100, and meanwhile, the edge plate 330 also provides support for the second shear box 300, and the surrounding plate 320 is prevented from being embedded into the sample 020 in the first shear box 100.
Specifically, the enclosing plate 320 is provided with a screw hole, the side plate 330 is attached to the outer side of the enclosing plate 320, and the screw 340 is matched with the screw hole in the enclosing plate 320 to detachably connect the side plate 330 with the enclosing plate 320. As shown in FIG. 1, the end of side panel 330 adjacent to shroud 320 has an "L-shaped" attachment end that mates with the "inverted L-shaped" attachment end of the end of shroud 320 and is attached by screws 340. After sample 020 is loaded, edge panel 330 can be removed from the outside of enclosure 320 and the test can be performed. In this embodiment, the shroud 320 and base plate 310 are also mated by an "L-shaped" connection end and a "reverse L-shaped" connection end, and are connected by screws 340.
The application method of the direct shear tester 010 provided by the embodiment of the application is as follows:
first, a first shear box 100 is assembled, and then a sample 020 is filled in the first shear box 100; assembling the side plate 330 and the side plate 320 of the second shearing box 300, and coating a layer of vaseline on the inner wall of the second shearing box 300; placing the side plate 330 of the second shear box 300 (the bottom plate 310 is not assembled yet) with an opening facing downwards on the surface of the sample 020 in the first shear box 100, and then filling the second shear box 300 with the sample 020; the bottom plate 310 of the second shear box 300 is mounted. The first shear box 100 and the second shear box 300 filled with the test piece 020 are placed on the sliding assembly 110, the first driving mechanism and the first shear box 100 are connected, and the abutting piece 500 abuts against the second shear box 300. A load plate 420 and a roller 430 are disposed on the outside of the bottom of the second shear box 300, to which the second driving member 400 (shown in fig. 1) is coupled. In the direct shear test, the sideboard 330 of the second shear box 300 is removed (as shown in fig. 2), and then the second driving member 400 is loaded and the first driving member 200 is loaded, so that the first shear box 100 is displaced in the second direction at a predetermined speed. The force values of the first 200 and second 400 drivers are recorded and can be used to determine the strength of the sample 020.
The direct shear tester 010 of the embodiment is characterized in that: the opening area of the first shear box 100 is smaller than that of the second shear box 300, so that the shear area is not changed in the shearing process. After the side plate 330 of the second cutting box 300 is removed, a reserved cutting slot is formed. The supporting member 500 is provided with a bearing 510, so that the vertical friction force between the second shear box 300 and the supporting member 500 is effectively reduced. The loading plate 420, the rolling members 430, and the ball 410 are arranged such that the force output by the second drive 400 is uniform when it is eventually transmitted to the bottom of the second shear box 300. The direct shear tester 010 is applicable to testing of soil samples and can also be used for detecting rock structural surface samples.
To sum up, the direct shear tester 010 provided by the embodiment of the present application includes the first shear box 100, the second shear box 300, the first driving mechanism and the second driving mechanism, the opening of the first shear box 100 is opposite to the opening of the second shear box 300 in the first direction, the first driving mechanism is used for driving the first shear box 100 to move in the second direction, the second direction is perpendicular to the first direction, and the second driving mechanism is used for driving the second shear box 300 to move in the first direction. The second driving mechanism includes a second driving member 400 and a loading plate 420, and one surface of the loading plate 420 is slidably coupled to the outside of the bottom of the second shear box 300 and the other surface thereof is rotatably coupled to the output end of the second driving member 400. When the first driving mechanism drives the first shear box 100 to move in the second direction relative to the second shear box 300, the geotechnical materials inside the first shear box 100 and the second shear box 300 are subjected to shear slip at the openings of the two shear boxes. The first-direction pressure output from the second driving member 400 is first transmitted to the loading plate 420, then to the second shear box 300, and finally to the geotechnical materials in the second shear box 300. Due to the fact that the output end of the second driving member 400 is rotatable with the loading plate 420, and the loading plate 420 is slidably connected with the outer side of the bottom of the second shear box 300, even if the second shear box 300 slightly tilts, the loading plate 420 adaptively slightly rotates, so that the loading plate 420 uniformly rotates towards the outer side of the bottom of the second shear box 300, the stress between the rock-soil material in the second shear box 300 and the rock-soil material in the first shear box 100 is uniform, and the accuracy of the direct shear test result is ensured.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A direct shear tester is characterized by comprising a first shear box, a second shear box, a first driving mechanism and a second driving mechanism, wherein an opening of the first shear box is opposite to an opening of the second shear box in a first direction, the first driving mechanism is used for driving the first shear box to move in a second direction, the second direction is perpendicular to the first direction, and the second driving mechanism is used for driving the second shear box to move in the first direction;
the second driving mechanism comprises a second driving piece and a loading plate, one surface of the loading plate is slidably connected with the outer side of the bottom of the second shearing box, and the other surface of the loading plate is rotatably connected with the output end of the second driving piece.
2. A direct shear tester according to claim 1, wherein the load plate abuts against the outside of the bottom of the second shear box by means of rollers so that the load plate is slidable in the second direction relative to the second shear box.
3. A direct shear tester as claimed in claim 1, wherein the output end of the second driver is connected to the load plate by a ball head so that the load plate can rotate in multiple directions relative to the output end of the second driver.
4. A direct shear tester according to claim 1, wherein the projection of the opening of the second shear box in the first direction falls into the opening of the first shear box.
5. A direct shear tester as claimed in claim 1, further comprising a holding member for holding the second shear box to restrict movement of the second shear box in the second direction.
6. A direct shear tester as claimed in claim 5, wherein the abutment is connected to an outer wall of the second shear box by a bearing so that the second shear box can slide relative to the abutment in the first direction.
7. A direct shear tester as claimed in claim 1, wherein the second shear box comprises a bottom plate, a surrounding plate and a side plate, the surrounding plate is detachably connected to the edge of the bottom plate, one end of the side plate is detachably connected to the end of the surrounding plate far away from the bottom plate, the other end of the side plate extends towards the outside of the second shear box, the side plate is perpendicular to the first direction, and the side plate and the opening of the second shear box can jointly cover the opening of the first shear box.
8. The direct shear tester of claim 7, wherein the coaming is provided with screw holes, the side plate is attached to the outer side of the coaming, and the detachable connection of the side plate and the coaming is realized by matching screws with the screw holes on the coaming.
9. A direct shear tester according to claim 1, wherein a sliding assembly is provided on the outside of the bottom of the first shear box, and the first shear box abuts against a support surface via the sliding assembly and is slidable in the second direction relative to the support surface.
10. The direct shear tester of claim 1, wherein the first driving mechanism comprises a first driving member and a pull rod, an output end of the first driving member is connected with one end of the pull rod through a first pull ring, and the other end of the pull rod is connected with the outer wall of the first shear box through a second pull ring.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111037921.1A CN113624591A (en) | 2021-09-06 | 2021-09-06 | Direct shear tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111037921.1A CN113624591A (en) | 2021-09-06 | 2021-09-06 | Direct shear tester |
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Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101846606A (en) * | 2010-05-27 | 2010-09-29 | 中国科学院武汉岩土力学研究所 | Earth-structure interaction contact surface shearing test visualization device |
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