CN212693492U - Direct shear test device for contact surface anisotropy - Google Patents
Direct shear test device for contact surface anisotropy Download PDFInfo
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- CN212693492U CN212693492U CN202020762337.7U CN202020762337U CN212693492U CN 212693492 U CN212693492 U CN 212693492U CN 202020762337 U CN202020762337 U CN 202020762337U CN 212693492 U CN212693492 U CN 212693492U
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Abstract
The utility model discloses a direct shear test device for contact surface anisotropy, which comprises an upper shear box, a lower shear box and a chassis, wherein the upper shear box, the lower shear box and the chassis are sequentially arranged from top to bottom; the utility model discloses a shear block, including last shearing box, be equipped with the first cavity that is used for holding the soil body in the last shearing box, be equipped with the second cavity that is used for holding the structure thing test block in the lower shearing box, the second cavity communicates with each other with first cavity, the cross sectional area ratio of first cavity and second cavity is 1: (1.05-5); the structure test block is matched with the second cavity, and an angle indicating part is arranged on the top surface of the structure test block; the chassis is provided with angle marking scale lines, and the angle indication part and the angle marking scale lines jointly indicate the direct shear test angle. The utility model discloses experimental convenient and fast, the accuracy of test result is high.
Description
Technical Field
The utility model relates to a geotechnical engineering laboratory test technical field especially relates to a be used for contact surface anisotropy direct shear test device.
Background
In the field of geotechnical engineering, when the interaction analysis is performed on the soil body and different structures (such as piles, retaining walls, anchor rods and the like) in contact with the soil body, the mechanical parameters of the contact surface between the soil body and a specific structure need to be reasonably selected.
At present, the direct shear test is the most common indoor test method for testing the mechanical parameters of the contact surface of the soil body and the structure. The existing contact surface direct shear apparatus is mostly improved on the basis of the conventional soil body direct shear apparatus, and contact surface shear test research between a soil body and different structures is carried out by replacing a lower shear box with different structure test blocks.
However, the existing contact surface direct shear apparatus has the following disadvantages:
(1) when the relative shearing displacement between the upper soil body and the structure is overlarge, soil body particles in the box can leak out, and the test result is influenced;
(2) the existing upper and lower shearing boxes can reduce the actual contact area between the soil body and the structure after relative dislocation occurs between the soil body and the structure in the shearing process, increase the normal stress of the contact surface under the condition of unchanged applied normal load, and simultaneously need area correction when calculating the shearing force of the contact surface;
(3) roughness is taken as an important factor influencing the mechanical property of a contact surface, when the existing instrument is used for researching the roughness anisotropy of the contact surface, a structural object test block needs to be taken out after a shearing test in a shearing direction is completed, and the structural object test block is manually rotated for a certain angle and then is re-installed in a lower shearing box, so that the whole test process is complicated, the angle cannot be accurately determined, and the quantitative analysis on the roughness anisotropy of the contact surface cannot be carried out.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a be used for contact surface anisotropy direct shear test device is provided, its experimental convenient and fast, the accuracy of test result is high.
In order to solve the technical problem, the utility model provides a direct shear test device for contact surface anisotropy, which comprises an upper shear box, a lower shear box and a chassis, wherein the upper shear box, the lower shear box and the chassis are sequentially arranged from top to bottom;
the utility model discloses a shear block, including last shearing box, be equipped with the first cavity that is used for holding the soil body in the last shearing box, be equipped with the second cavity that is used for holding the structure thing test block in the lower shearing box, the second cavity communicates with each other with first cavity, the cross sectional area ratio of first cavity and second cavity is 1: (1.05-5);
the structure test block is matched with the second cavity, and an angle indicating part is arranged on the top surface of the structure test block;
the chassis is provided with angle marking scale lines, and the angle indication part and the angle marking scale lines jointly indicate the direct shear test angle.
As an improvement of the above scheme, the ratio of the cross-sectional areas of the first cavity and the second cavity is 1: (1.1-2).
As an improvement of the above scheme, the angle indicating part is provided with an indicating strip.
As an improvement of the scheme, the indication strip is a groove and/or a convex strip formed on the top surface of the structure test block.
As an improvement of the scheme, the indication strips are arranged in parallel into a plurality of groups.
As an improvement of the scheme, the cross section of the indicating strip is in a sawtooth shape or a long strip shape.
As an improvement of the scheme, the top surface of the structural test block is flush with the top of the lower shear box.
As an improvement of the scheme, the structural object test block is fixed with the lower cutting box.
As an improvement of the scheme, the inner wall of the second cavity is provided with a plurality of groups of positioning strips, the side wall of the structure test block is provided with positioning grooves matched with the positioning strips, and the positioning grooves are clamped with the positioning strips.
As an improvement of the scheme, the upper shearing box, the lower shearing box and the chassis are all cylindrical, and the lower shearing box and the chassis are coaxially arranged;
the angle marking scale lines are arranged on the top surface of the base plate and are arranged along the circumferential direction of the lower shearing box.
Implement the utility model discloses, following beneficial effect has:
the utility model provides a be used for contact surface anisotropy direct shear test device, through with last shearing box, lower shearing box and chassis from last to setting gradually down, establish the first cavity that sets up and be used for holding the soil body in last shearing box, set up the second cavity that is used for holding structure thing test block in lower shearing box, the ratio of the cross sectional area of first cavity and second cavity is 1: (1.05-5), when a direct shear test is carried out, because the cross section area of the second cavity is large enough, when relative dislocation occurs between the soil body and the structure, the situation that the soil body leaks from the bottom of the upper shear box can be avoided, the actual contact area between the soil body and the structure can be kept unchanged, the normal stress of the contact surface is kept consistent before and after under the condition that the applied normal load is unchanged, and the accuracy of the test result is high; in addition, the structure test block sets up in the second cavity with its looks adaptation, the top surface of structure test block sets up angle indicating part, when carrying out the shear test of a plurality of shear directions, only need rotatory lower shear box, make the corresponding angle that the angle mark scale mark line on the directional chassis of angle indicating part of structure test block top surface in the lower shear box, obtain the test result of current angle promptly, whole testing process need not take out the structure test block, and can test under accurate angle, it is experimental convenient and fast, and the accuracy of test result is high.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a direct shear test apparatus for contact surface anisotropy according to the present invention;
FIG. 2 is a schematic structural view of the building block of FIG. 1;
FIG. 3 is a front view of the structure block of FIG. 2;
FIG. 4 is a top view of an upper shear box of another embodiment of a direct contact surface anisotropy shear test apparatus, shown removed.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides an embodiment of a direct shear test apparatus for anisotropic contact surface, which includes an upper shear box 1, a lower shear box 2 and a chassis 3, wherein the upper shear box 1, the lower shear box 2 and the chassis 3 are sequentially arranged from top to bottom; the utility model discloses a structure test block, including last shearing box 1, be equipped with the first cavity 11 that is used for holding the soil body in the last shearing box 1, be equipped with the second cavity 21 that is used for holding structure thing test block 4 in the lower shearing box 2, second cavity 21 communicates with each other with first cavity 11, the cross sectional area ratio of first cavity 11 and second cavity 21 is 1: (1.05-5); the structure test block 4 is matched with the second cavity 21, and the top surface of the structure test block 4 is provided with an angle indicating part 41; the chassis 3 is provided with angle marking scale lines (not shown in the figure), and the angle indication part 41 and the angle marking scale lines jointly indicate the direct shear test angle.
This embodiment is through with the box 1 of cuting from last to setting gradually down of cuting box 1, lower cuting box 2 and chassis 3, establishes the first cavity 11 that is used for holding the soil body in the box 1 of cuting at last, sets up the second cavity 21 that is used for holding structure thing test block 4 in the box 2 of cuting down, and the ratio of the cross sectional area of first cavity 11 and second cavity 21 is 1: (1.05-5), when a direct shear test is carried out, because the cross section area of the second cavity 21 is large enough, when relative dislocation occurs between a soil body and a structure, the situation that the soil body leaks from the bottom of the upper shear box 1 can be avoided, the actual contact area between the soil body and the structure can be kept unchanged, the normal stress of a contact surface is kept consistent before and after under the condition that the applied normal load is unchanged, and the accuracy of a test result is high; in addition, structure test block 4 sets up in the second cavity 21 with its looks adaptation, the top surface of structure test block 4 sets up angle indicating part 41, when carrying out the shear test of a plurality of shear directions, only need rotatory lower shear box 2, make the corresponding angle of angle mark scale mark on the directional chassis 3 of angle indicating part 41 of 4 top surfaces of structure test block in lower shear box 2, obtain the test result of current angle promptly, whole testing process need not take out structure test block 4, and can test under accurate angle, it is experimental convenient and fast, and the accuracy of test result is high.
The upper shear box 1, the lower shear box 2 and the base plate 3 of the present embodiment are preferably cylindrical, and the lower shear box 2 and the base plate 3 are coaxially arranged. In order to facilitate reading of the test angle, the angle marking scale lines are arranged on the top surface of the chassis 3 and arranged along the circumferential direction of the lower shear box 2.
In order to minimize the volume of the whole contact surface anisotropy direct shear test device, the ratio of the cross-sectional areas of the first cavity 11 and the second cavity 21 is preferably 1: (1.1-2), the upper shearing box 1 and the lower shearing box 2 within the ratio range can simultaneously avoid soil body leakage from the bottom of the upper shearing box 1, and the actual contact area of the upper shearing box 1 and the lower shearing box 2 in the shearing process is ensured to be unchanged, namely the actual shearing area in the shearing process is ensured to be constant.
For the convenient contact condition who observes in last shearing box 1 and the soil body in it and the lower shearing box 2 structure thing test block 4, the interval between convenient adjustment last shearing box 1 and the lower shearing box 2 makes lower shearing box 2 provide good locate function for structure thing test block 4 simultaneously, and the top surface of this embodiment structure thing test block 4 is preferred to be flushed with the top of lower shearing box 2.
Referring to fig. 2, the angle indicator 41 of the present embodiment is provided with an indicator bar 411. The indication strip 411 is specifically a groove and/or a raised strip formed on the top surface of the structure test block 4. To facilitate the determination of the current test angle, the indication bars 411 may be arranged in parallel in multiple groups.
With reference to fig. 3, in order to conveniently and accurately determine the current test angle, the cross section of the indicator strip 411 is preferably a sawtooth shape or a strip shape, and such a ridge between adjacent surfaces of the indicator strip 411 can help to quickly and accurately determine the current test angle.
When different angles are changed for testing, in order to ensure that the rotation angle of the lower shearing box 2 is consistent with the angle of the structure test block 4, the structure test block 4 is fixed with the lower shearing box 2. Specifically, with reference to fig. 4, the inner wall of the second cavity 21 is provided with a plurality of sets of positioning strips 211, the side wall of the structure test block 4 is provided with a positioning groove 42 matched with the positioning strips 211, and the positioning groove 42 is clamped with the positioning strips 211 to ensure that the rotation angle of the structure test block 4 is consistent with that of the lower shearing box 2 when the lower shearing box 2 is rotated.
The specific steps of the direct shear test device for the contact surface anisotropy are as follows:
(1) prefabricating a structural object test block 4 with the diameter being the same as the inner diameter of the lower shearing box 2;
in order to simulate a rough structural surface in practical engineering, grooves or ribs are generally required to be prefabricated on the top surface of the structure test block 4, in this embodiment, the prefabricated grooves or ribs are arranged on the top surface of the structure test block 4 in parallel in order to obtain the test angle of the structure test block 4, and the cross sections of the prefabricated grooves or ribs are in a zigzag shape or a long strip shape.
The side of the structure test block 4 is prefabricated with a positioning groove 42 matched with the positioning strip 211 on the inner wall of the second cavity 21.
(2) The structure test block 4 is placed in the lower shearing box 2, the positioning strip 211 of the structure test block 4 is clamped into the positioning groove 42 in the lower shearing box 2, the top surface of the structure test block 4 is flush with the top of the lower shearing box 2, and the arrangement direction of the indication strips 411 on the top surface of the structure test block 4 is kept to form an angle of 0 degree with the shearing direction.
(3) The upper shearing box 1 is stacked above the lower shearing box 2, a test soil body is placed into the upper shearing box 1 according to requirements, and the soil body in the box is in direct contact with the top surface of the structure test block 4.
(4) And applying a vertical load to the soil sample in the box, and applying a horizontal load F to the upper shearing box 1 after the soil body is deformed and stabilized to perform a shearing test at a certain speed.
(5) After the shear test is finished, the upper shear box 1 is removed, and soil samples in the box and on the surface of the structural object test block 4 are cleaned.
(6) The rotation angle of the lower cutting box 2 is the rotation angle of the indicator bar 411 because the structure test block 4 is fixed in the lower cutting box 2.
(7) The operation steps (3) to (6) are repeated, and so on, to complete the contact surface shear test at different anisotropy angles θ (i.e., the included angle formed by the arrangement direction of the indicator strips 411 and the shearing direction).
Therefore, the process of testing by the contact surface anisotropy direct shear testing device is high in testing efficiency, the accuracy of the obtained test result is high, and the test result can be used for further analyzing the influence rule of the anisotropy angle on the mechanical property of the contact surface.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (10)
1. The direct shear test device for the contact surface anisotropy is characterized by comprising an upper shear box, a lower shear box and a chassis, wherein the upper shear box, the lower shear box and the chassis are sequentially arranged from top to bottom;
the utility model discloses a shear block, including last shearing box, be equipped with the first cavity that is used for holding the soil body in the last shearing box, be equipped with the second cavity that is used for holding the structure thing test block in the lower shearing box, the second cavity communicates with each other with first cavity, the cross sectional area ratio of first cavity and second cavity is 1: (1.05-5);
the structure test block is matched with the second cavity, and an angle indicating part is arranged on the top surface of the structure test block;
the chassis is provided with angle marking scale lines, and the angle indication part and the angle marking scale lines jointly indicate the direct shear test angle.
2. The direct shear test device for contact surface anisotropy according to claim 1, wherein the ratio of the cross-sectional areas of the first cavity and the second cavity is 1: (1.1-2).
3. The direct shear test device for contact surface anisotropy according to claim 1 or 2, characterized in that the angle indicator is provided with an indicator strip.
4. The direct shear test device for contact surface anisotropy according to claim 3, wherein the indicator strip is a groove and/or a rib formed on the top surface of the structure test block.
5. The direct shear test device for contact surface anisotropy according to claim 3, wherein the indicator strips are arranged in parallel in multiple groups.
6. The direct shear test device for contact surface anisotropy according to claim 3, wherein the cross section of the indicator strip is saw-toothed or elongated.
7. The direct shear test device for contact surface anisotropy according to claim 1, wherein the top surface of the structure test block is flush with the top of the lower shear box.
8. The direct shear test device for anisotropic contact surface of claim 1, wherein the structure test block is fixed to the lower shear box.
9. The direct shear test device for the contact surface anisotropy according to claim 1 or 8, wherein the inner wall of the second cavity is provided with a plurality of groups of positioning strips, the side wall of the structure test block is provided with positioning grooves matched with the positioning strips, and the positioning grooves are clamped with the positioning strips.
10. The direct shear test device for anisotropic contact surface of claim 1, wherein the upper shear box, the lower shear box and the bottom plate are all cylindrical, and the lower shear box and the bottom plate are coaxially arranged;
the angle marking scale lines are arranged on the top surface of the base plate and are arranged along the circumferential direction of the lower shearing box.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020762337.7U CN212693492U (en) | 2020-05-09 | 2020-05-09 | Direct shear test device for contact surface anisotropy |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020762337.7U CN212693492U (en) | 2020-05-09 | 2020-05-09 | Direct shear test device for contact surface anisotropy |
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| CN212693492U true CN212693492U (en) | 2021-03-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804560A (en) * | 2021-07-30 | 2021-12-17 | 南华大学 | Unsaturated soil and structure interface shear visual test device and method |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804560A (en) * | 2021-07-30 | 2021-12-17 | 南华大学 | Unsaturated soil and structure interface shear visual test device and method |
| CN113804560B (en) * | 2021-07-30 | 2023-09-26 | 南华大学 | Unsaturated soil and structure interface shear visualization test device and method |
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