A soil-structure shearing test sample making mold and method thereof

Abstract

The application discloses a kind of soil body-structure shearing test sample production mould and its production method, belong to geotechnical test device technical field, production mould includes limiting base and the mould body with profile cavity being equipped at top, limiting base is equipped with the insertion slot for the insertion of mould body, the top of insertion slot and the cavity top of profile cavity are flush, mould body is assembled by two vertically arranged half mould bodies, forming groove for forming profile cavity is equipped on the assembling surface of two half mould bodies, hand-held area for being used to hand is equipped on the back surface of two half mould bodies, the side wall of insertion slot is equipped with the operation openwork area for hand-held area to be exposed.The production method includes: S1, mould installation;S2, compression sample preparation;S3, sample demolding.Demolding mode is simple, fast, and the demolding process will not cause disturbance to sample, can avoid sample damage and distortion in demolding process, and by controlling the height of sample, the dry density of sample soil body can be controlled, to realize the production of controllable soil sample dry density.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geotechnical test devices, in particular to a soil-structure shear test sample preparation mold and method thereof. BACKGROUND

[0002] The interaction between soil and structure (such as soil and foundation, soil and concrete pile, soil and underground pipeline, etc.) is a hot topic in the study of underground space structure, especially the study of the shear strength of the interface between soil and structure: due to the intervention of various environmental factors (such as changes in underground water level, geological disasters, etc.), in actual engineering, the relative movement of soil and structure and the difference between the deformation performance of the two often cause large shear stress at the interface between the two, thereby causing damage to the structure.

[0003] At present, the study of the shear stress between soil and structure is generally to use direct shear test to correctly simulate the interface shear strength and parameters (such as cohesion C, internal friction angle φ, etc.) of soil-structure, so as to guide the engineering design of underground space structure. However, the traditional direct shear sample preparation mold has many problems: first, the sample needs to be vibrated, knocked and squeezed during the demolding process after the sample preparation, which causes great disturbance and damage to the interface of the soil-structure sample, directly leading to the distortion of the direct shear test; second, the preparation height of the sample cannot be observed in real time during the preparation process. Therefore, the patent number "202021181958.2" and the patent name "a soil test sample preparation mold" propose a soil mold that is easy to demold, which includes a cylinder, a bottom plate and a push rod, a circular boss is arranged in the center of the bottom plate, a circular push plate is fixedly connected to the lower end of the push rod, the circular boss of the bottom plate is inserted into the bottom of the cylinder, and the soil and structure are filled into the cylinder, then the circular push plate on the push rod is inserted into the cylinder to press down, and the compression molding of the sample is completed. When demolding, the bottom plate is only removed, and then the soil sample is pushed out from the bottom of the cylinder by the push rod. However, the above-mentioned mold, although it reduces the difficulty of demolding to a certain extent, the hardness and density of the soil and the structure are not the same, and the soil and the structure inside it may move relatively, causing great disturbance and damage to the interface of the soil-structure sample, which still leads to the distortion of the direct shear test. SUMMARY

[0004] The purpose of the present application is to solve the above technical problems, provide a soil-structure shear test sample preparation mold and method thereof, which is simple and fast in demolding mode, and does not disturb the sample during demolding, so as to avoid damage and distortion, and at the same time, by controlling the height of the sample, the dry density of the sample soil can be controlled, and the preparation of the sample with controllable dry density is realized.

[0005] In order to achieve the above object, the present application provides the following scheme: The present application discloses a soil-structure shear test sample production mold, which comprises a limiting base and a mold body provided with a compression cavity at the top, wherein the limiting base is provided with a plug-in groove for the plug-in of the mold body, the groove top of the plug-in groove is flush with the cavity top of the compression cavity, the mold body is assembled by two vertically arranged half mold bodies, the assembling surface of the two half mold bodies is provided with a forming groove for forming the compression cavity, the back surface of the two half mold bodies is provided with a hand holding area for hand holding, and the sidewall of the plug-in groove is provided with an operation hollow area for the exposure of the hand holding area.

[0006] Preferably, the assembling surface of the two half mold bodies is correspondingly provided with a plug-in head and a plug-in hole.

[0007] Preferably, the hand holding area is provided with a lifting hole for the insertion of fingers.

[0008] Preferably, the compression cavity is a cylindrical cavity.

[0009] Preferably, the mold body is a cuboid.

[0010] Preferably, one of the half mold bodies is provided with a transparent section which is in the same height as the compression cavity, and the two sides of the transparent section extend to the hand holding area and the forming groove, respectively.

[0011] Preferably, the transparent section is provided with a scale line along the height direction.

[0012] Preferably, the transparent section and the half mold body are detachably connected.

[0013] Preferably, the transparent section is a cross-shaped long strip, and the half mold body is provided with a cross-shaped groove for the plug-in of the transparent section.

[0014] A soil-structure shear test sample production method is also disclosed, which adopts the soil-structure shear test sample production mold described above and comprises the following steps:

[0015] S1, assembling the two half mold bodies into the mold body, and inserting the mold body into the plug-in groove of the limiting base;

[0016] S2, adding soil and structure material into the compression cavity, compressing by a material compression testing machine, and compressing to a preset height;

[0017] S3, taking out the mold body from the plug-in groove by hand, then disassembling the mold body into the two half mold bodies, and taking out the produced sample completely.

[0018] The present application has the following technical effects compared with the prior art:

[0019] 1. The soil-structure interface shear test sample production mold structure is simple, easy to operate, and can be used with most material compression testing machines on the market, the mold body can be separated into two half mold bodies without damaging the sample by lifting the production mold from the limiting base, and this demolding method will not disturb the sample, causing the soil body and the structure to move relatively and distort.

[0020] 2. The production mold in the application can monitor the production height of the sample in real time by setting a transparent body segment on one of the half mold bodies, so that the sample can be controlled, and the dry density of the soil body can also be controlled by controlling the height.

[0021] 3. The transparent body segment is provided with a scale line, which can quantify the production process and improve the production accuracy.

[0022] 4. The production process steps are simple and fast, and the soil-structure interface shear sample can be produced quickly and without damage by following the preparation process method, and the dry density of the sample can be controlled by controlling the sample height, so that the sample with the preset dry density is obtained, and the problem of being unable to control the dry density of the soil sample during sample preparation and the difficulty of sample demolding causing damage to the soil-structure interface is solved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 Figure 1 is a perspective view of a soil-structure interface shear test sample production mold;

[0025] Figure 2 Figure 2 is a perspective view of a limiting base;

[0026] Figure 3 Figure 3 is a perspective view of a half mold body II;

[0027] Figure 4 Figure 4 is a perspective view of a half mold body I;

[0028] Figure 5 Figure 5 is another perspective view of the half mold body I;

[0029] Figure 6 Figure 6 is a perspective view of a transparent body segment.

[0030] Explanation of reference numerals in the attached drawings: 1. Limiting base; 2. Half-mold I; 3. Half-mold II; 4. Insertion groove; 5. Operating hollow area; 6. Molding groove; 7. Insertion connector; 8. Insertion hole; 9. Lifting hole; 10. Transparent body section; 11. Cross-shaped groove. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1

[0033] This embodiment provides a mold for preparing soil-structure shear test specimens, such as... Figures 1 to 6 As shown, the device includes a mold body and a limiting base 1. The top of the mold body has a molding cavity for filling with soil and structures, so that it can be used with a material compression testing machine to compress the material inside the molding cavity to form a soil-structure shear test specimen. The mold body is assembled from vertically arranged half-molds I2 and II3. Both half-molds I2 and II3 have forming grooves 6 on their assembly surfaces. After the half-molds I2 and II3 are assembled, their forming grooves 6 form the molding cavity. The limiting base 1 has an insertion groove 4 for inserting the mold body. The top of the insertion groove 4 is flush with the top of the molding cavity, thus the insertion groove 4 can tighten the mold body, ensuring that half-molds I2 and II3 do not separate during the specimen compression molding process. Both half-mold I2 and half-mold II3 have hand-held areas on their back surfaces. Through these hand-held areas, workers can easily hold the assembled mold body and insert it into the insertion slot 4. The side wall of the insertion slot 4 of the limiting base 1 has an operating hollow area 5, which exposes the hand-held areas, allowing workers to easily hold the mold body and remove it from the insertion slot 4. By separating half-mold I2 and half-mold II3, the mold can be demolded. This demolding method does not disturb the sample itself, thus avoiding relative movement between the soil and structure in the sample, which would cause distortion.

[0034] Furthermore, in this embodiment, as Figures 1 to 6As shown, the half mold body Ⅱ 3 is provided with a plug-in head 7, and the half mold body Ⅰ 2 is provided with a plug-in hole 8. By inserting the plug-in head 7 into the plug-in hole 8, the half mold body Ⅰ 2 and the half mold body Ⅱ 3 can be assembled to form the mold body. At the same time, the plug-in head 7 and the plug-in hole 8 cooperate to play a guiding role, ensuring that the half mold body Ⅰ 2 and the half mold body Ⅱ 3 will not be separated and cause damage to the sample inside the compression cavity. As a preferred embodiment, four plug-in holes 8 are arranged on the assembly surface of the half mold body Ⅰ 2, two by two, on both sides of the forming groove 6, and four plug-in heads 7 are arranged on the assembly surface of the half mold body Ⅱ 3, two by two, on both sides of the forming groove 6.

[0035] In order to facilitate the assembly, holding and lifting of the mold body, in the present embodiment, as shown in the figure, Figures 1 to 6 the hand holding area of the half mold body Ⅰ 2 and the half mold body Ⅱ 3 is provided with a lifting hole 9, and by inserting the fingers into the lifting hole 9, the above-mentioned actions can be completed. As a preferred embodiment, four lifting holes 9 are arranged on the hand holding area, and the four lifting holes 9 are arranged in a square shape, so that four fingers can be inserted into the lifting hole 9 at the same time, forming a grip similar to the bowling hole.

[0036] In the present embodiment, as shown in the figure, Figures 1 to 6 the compression cavity is a cylindrical cavity, which can cooperate with the material compression testing machine of most circular platens on the market to form a cylindrical sample.

[0037] Further, in the present embodiment, as shown in the figure, Figures 1 to 6 the mold body is a rectangular parallelepiped, and the corresponding half mold body Ⅰ 2 and half mold body Ⅱ 3 are two symmetrically arranged small rectangular parallelepipeds, and the forming groove 6 is two symmetrically arranged semicircular grooves, thereby forming a cylindrical compression cavity. The corresponding limiting base 1 is a rectangular frame structure, and the limiting base 1 is provided with an operation hollow area 5 on each of the four sides, so as to facilitate the insertion of the mold body in any direction into the limiting base 1, and the lifting hole 9 can be exposed, thereby improving the convenience.

[0038] In order to be able to observe the preparation height of the sample in real time during the preparation of the sample, in the present embodiment, as shown in the figure, Figures 1 to 6 a transparent body section 10 is arranged on the half mold body Ⅰ 2, which is the same height as the compression cavity, and the two sides of the transparent body section 10 extend to the hand holding area and the forming groove 6 respectively. Through the operation hollow area 5 and the transparent body section 10, the real-time height of the sample during the compression process can be observed from the outside of the mold body.

[0039] Further, in order to improve the accuracy of sample preparation, in the present embodiment, as shown in the figure, Figures 1 to 6As shown in the figure, the transparent body segment 10 is provided with scale lines along the height direction, so as to control the preparation height of the sample, and by controlling the preparation height of the sample, the dry density Pd of the sample can also be controlled. Because the dry density Pd of the soil refers to the density when the pores of the soil are completely free of water, that is, the ratio of the mass m of the solid particles to the total volume V of the soil. And the total volume V of the soil is the product of the bottom area S of the compression cavity and the sample forming height L, so by observing the sample production height L in real time, the dry density Pd of the prepared sample can be controlled, and when the sample is compressed to the specified height, the compression can be stopped.

[0040] In this embodiment, as shown in the figure, Figures 1 to 6 The transparent body segment 10 and the half mold body I 2 are detachably connected, so if the transparent body segment 10 is seriously worn during the preparation of the sample, it can also be replaced. And the transparent body segment 10 with different precision scale lines can be prepared in advance to replace at any time according to the experimental requirements, to meet the sample preparation precision requirements of different tests.

[0041] Further, in this embodiment, as shown in the figure, Figures 1 to 6 The transparent body segment 10 is a cross-shaped long strip, and the half mold body I 2 is provided with a cross-shaped groove 11 for inserting the transparent body segment 10. As a preferred, the cross-shaped groove 11 is located in the middle of the four upper lifting holes 9. The transparent body segment 10 can be made of transparent tempered glass.

[0042] Embodiment 2

[0043] This embodiment provides a soil-structure shear test sample preparation method, which adopts the soil-structure shear test sample preparation mold in embodiment 1, as shown in the figure, comprising the following steps: Figures 1 to 6

[0044] S1, mold installation: assemble the half mold body I 2 and the half mold body II 3 into the mold body, and insert the mold body into the insertion groove 4 of the limiting base 1;

[0045] S2, compression sample: add soil and structure material to the compression cavity, and compress by the material compression testing machine to a predetermined height;

[0046] S3, sample demolding: take out the mold body from the insertion groove 4 with hands, then disassemble the mold body into the half mold body I and the half mold body II, and the prepared sample can be taken out completely.

[0047] ​The dry density Pd of the soil refers to the density of the soil when the pores are completely free of water, i.e. the ratio of the mass m of the solid particles to the total volume V of the soil. The total volume V of the soil is the product of the bottom area S of the compression cavity and the forming height L of the sample. Therefore, by observing the forming height L of the sample in real time, the dry density Pd of the prepared sample can be controlled, and the compression can be stopped when the sample is compressed to the specified height.

[0048] As shown in the embodiment, Figures 1 to 6 In step S1, first, the transparent scale section 10 is placed in the cross-shaped slot 11 of the half mold body I 2, then the plug-in connector 7 of the half mold body II 3 is inserted into the plug-in hole 8 of the half mold body I 2 one by one, and then the half mold body II 3 and the half mold body I 2 are placed in the plug-in slot 4 of the limiting base 1 to form a relatively fixed manufacturing mold.

[0049] As shown in the embodiment, Figures 1 to 6 In step S2, first, the soil and the structural material are added to the compression cavity, and then the compression is performed by the ordinary material compression testing machine. The height of the sample is observed in real time by the transparent scale section 10, and the compression is stopped when the sample forming height L (i.e. the dry density Pd required for preparing the sample) is reached.

[0050] As shown in the embodiment, ​ In step S3, first, the fingers are inserted into the four parallel lifting holes 9, and then the half mold body I 2 and the half mold body II 3 are lifted upwards to realize the separation of the mold body and the limiting base 1. Then, the half mold body I 2 and the half mold body II 3 are separated in the opposite direction, and the prepared sample can be completely taken out.

[0051] The principles and implementation modes of the present application are described by using specific examples. The above examples are only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation modes and application ranges will be changed. In summary, the content of the present application should not be understood as a limitation of the present application.

Claims

1. A mold for preparing soil-structure shear test specimens, characterized in that, The utility model relates to a mould body with a limiting base and a top with a compression cavity, wherein the limiting base is provided with a plug-in slot for the mould body, the top of the plug-in slot is flush with the top of the compression cavity, the mould body is assembled by two vertically arranged half mould bodies, the assembling surface of the two half mould bodies is provided with a forming slot for forming the compression cavity, the back surface of the two half mould bodies is provided with a hand holding area for hand holding, the sidewall of the plug-in slot is provided with an operation hollow area for the hand holding area to be exposed, the hand holding area is provided with a lifting hole for fingers to be inserted, the mould body is a cuboid, the top of the plug-in slot has no gap, the plug-in slot can tighten the mould body, one of the half mould bodies is provided with a transparent section with the same height as the compression cavity, the two sides of the transparent section extend to the hand holding area and the forming slot respectively, the transparent section is provided with a scale along the height direction, and the transparent section and the half mould body are detachably connected.

2. The soil-structure shear test specimen production mold according to claim 1, characterized by, The assembling surface of the two half mould bodies is correspondingly provided with a plug-in head and a plug-in hole.

3. The soil-structure shear test specimen production mold according to claim 1, characterized by, The compression cavity is a cylindrical cavity.

4. The soil-structure shear test specimen production mold according to claim 1, characterized by, The transparent section is a cross-shaped long strip, and the half mould body is provided with a cross-shaped slot for the transparent section to be plugged in.

5. A method for making a soil-structure shear test specimen using the soil-structure shear test specimen making mold according to any one of claims 1 to 4, characterized by, The utility model relates to a mould body with a limiting base and a top with a compression cavity, wherein the limiting base is provided with a plug-in slot for the mould body, the top of the plug-in slot is flush with the top of the compression cavity, the mould body is assembled by two vertically arranged half mould bodies, the assembling surface of the two half mould bodies is provided with a forming slot for forming the compression cavity, the back surface of the two half mould bodies is provided with a hand holding area for hand holding, the sidewall of the plug-in slot is provided with an operation hollow area for the hand holding area to be exposed, the hand holding area is provided with a lifting hole for fingers to be inserted, the mould body is a cuboid, the top of the plug-in slot has no gap, the plug-in slot can tighten the mould body, one of the half mould bodies is provided with a transparent section with the same height as the compression cavity, the two sides of the transparent section extend to the hand holding area and the forming slot respectively, the transparent section is provided with a scale along the height direction, and the transparent section and the half mould body are detachably connected. The assembling surface of the two half mould bodies is correspondingly provided with a plug-in head and a plug-in hole. The compression cavity is a cylindrical cavity. The transparent section is a cross-shaped long strip, and the half mould body is provided with a cross-shaped slot for the transparent section to be plugged in. The utility model relates to a mould body with a limiting base and a top with a compression cavity, wherein the limiting base is provided with a plug-in slot for the mould body, the top of the plug-in slot is flush with the top of the compression cavity, the mould body is assembled by two vertically arranged half mould bodies, the assembling surface of the two half mould bodies is provided with a forming slot for forming the compression cavity, the back surface of the two half mould bodies is provided with a hand holding area for hand holding, the sidewall of the plug-in slot is provided with an operation hollow area for the hand holding area to be exposed, the hand holding area is provided with a lifting hole for fingers to be inserted, the mould body is a cuboid, the top of the plug-in slot has no gap, the plug-in slot can tighten the mould body, one of the half mould bodies is provided with a transparent section with the same height as the compression cavity, the two sides of the transparent section extend to the hand holding area and the forming slot respectively, the transparent section is provided with a scale along the height direction, and the transparent section and the half mould body are detachably connected. The assembling surface of the two half mould bodies is correspondingly provided with a plug-in head and a plug-in hole. The compression cavity is a cylindrical cavity. The transparent section is a cross-shaped long strip, and the half mould body is provided with a cross-shaped slot for the transparent section to be plugged in. The utility model relates to a mould body with a limiting base and a top with a compression cavity, wherein the limiting base is provided with a plug-in slot for the mould body, the top of the plug-in slot is flush with the top of the compression cavity, the mould body is assembled by two vertically arranged half mould bodies, the assembling surface of the two half mould bodies is provided with a forming slot for forming the compression cavity, the back surface of the two half mould bodies is provided with a hand holding area for hand holding, the sidewall of the plug-in slot is provided with an operation hollow area for the hand holding area to be exposed, the hand holding area is provided with a lifting hole for fingers to be inserted, the mould body is a cuboid, the top of the plug-in slot has no gap, the plug-in slot can tighten the mould body, one of the half mould bodies is provided with a transparent section with the same height as the compression cavity, the two sides of the transparent section extend to the hand holding area and the forming slot respectively, the transparent section is provided with a scale along the height direction, and the transparent section and the half mould body are detachably connected. The assembling surface of the two half mould bodies is correspondingly provided with a plug-in head and a plug-in hole. The compression cavity is a cylindrical cavity. The transparent section is a cross-shaped long strip, and the half mould body is provided with a cross-shaped slot for the transparent section to be plugged in. The utility model relates to a mould body with a limiting base and a top with a compression cavity, wherein the limiting base is provided with a plug-in slot for the mould body, the top of the plug-in slot is flush with the top of the compression cavity, the mould body is assembled by two vertically arranged half mould bodies, the assembling surface of the two half mould bodies is provided with a forming slot for forming the compression cavity, the back surface of the two half mould bodies is provided with a hand holding area for hand holding, the sidewall of the plug-in slot is provided with an operation hollow area for the hand holding area to be exposed, the hand holding area is provided with a lifting hole for fingers to be inserted, the mould body is a cuboid, the top of the plug-in slot has no gap, the plug-in slot can tighten the mould body, one of the half mould bodies is provided with a transparent section with the same height as the compression cavity, the two sides of the transparent section extend to the hand holding area and the forming slot respectively, the transparent section is provided with a scale along the height direction, and the transparent section and the half mould body are detachably connected. The assembling surface of the two half mould bodies is correspondingly provided with a plug-in head and a plug-in hole. The compression cavity is a cylindrical cavity. The transparent section is a cross-shaped long strip, and the half mould body is provided with a cross-shaped slot for the transparent section to be plugged in. The utility model relates to a mould body with a limiting base and a top with a compression cavity, wherein the limiting base is provided with a plug-in slot for the mould body, the top of the plug-in slot is flush with the top of the compression cavity, the mould body is assembled by two vertically arranged half mould bodies, the assembling surface of the two half mould bodies is provided with a forming slot for forming the compression cavity, the back surface of the two half mould bodies is provided with a hand holding area for hand holding, the sidewall of the plug-in slot is provided with an operation hollow area for the hand holding area to be exposed, the hand holding area is provided with a lifting hole for fingers to be inserted, the mould body is a cuboid, the top of the plug-in slot has no gap, the plug-in slot can tighten the mould body, one of the half mould bodies is provided with a transparent section with the same height as the compression cavity, the two sides of the transparent section extend to the hand holding area and the forming slot respectively, the transparent section is provided with a scale along the height direction, and the transparent section and the half mould body are detachably connected. The assembling surface of the two half mould bodies is correspondingly provided with a plug-in head and a plug-in hole. The compression cavity is a cylindrical cavity. The transparent section is a cross-shaped long strip, and the half mould body is provided with a cross-shaped slot for the transparent section to be plugged in. The utility model relates to a mould body with a limiting base and a top with a compression cavity, wherein the limiting base is provided with a plug-in slot for the mould body, the top of the plug-in slot is flush with the top of the compression cavity, the mould body is assembled by two vertically arranged half mould bodies, the assembling surface of the two half mould bodies is provided with a forming slot for forming the compression cavity, the back surface of the two half mould bodies is provided with a hand holding area for hand holding, the sidewall of the plug-in slot is provided with an operation hollow area for the hand holding area to be exposed, the hand holding area is provided with a lifting hole for fingers to be inserted, the mould body is a cuboid, the top of the plug-in slot has no gap, the plug-in slot can tighten the mould body, one of the half mould bodies is provided with a transparent section with the same height as the compression cavity, the two sides of the transparent section extend to the hand holding area and the

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