Testing device for simulating water-soil chemical action of fissure-containing clay

Abstract

The utility model discloses a test device for simulating water-soil chemical action of crack-containing clay, which is used for water-soil chemical action simulation test and comprises a support, and a closed solution box, a leaching model and a collecting bottle which are sequentially arranged on the support from top to bottom, the leaching model comprises a transparent rectangular leaching box with a through top and a rectangular test soil sample which is arranged in the leaching box and contains cracks, the bottom of the leaching box is communicated with the collection bottle through a liquid discharge pipe, and the bottom of the solution box is respectively communicated with a liquid outlet pipe and an air inlet pipe which extend into the leaching box; and the lowest end of the liquid outlet pipe is horizontally higher than the lowest end of the air inlet pipe. The experimental device disclosed by the utility model is simple in structure and convenient to operate, the development and evolution process of the water-soil chemical action in a soil body crack can be simulated through the arranged leaching model, and meanwhile, in the using process, the leaching solution in the leaching model can be automatically supplemented.

Description

Technical Field

[0001] The utility model relates to the field of water-soil chemical action research technology, in particular to a test device for simulating water-soil chemical action in cracked clay. Background Art

[0002] In actual engineering, there are often many structural cracks inside the soil. Groundwater will undergo various chemical reactions along the dominant seepage channels with the soil on both sides of the cracks, which will lead to the deterioration of the mechanical properties of the soil on the crack surface and cause serious natural disasters such as landslides. However, on-site sampling research has problems such as sampling difficulties and large disturbances. In addition, sampling cannot accurately control the morphology of weak structural surfaces, which brings many difficulties to subsequent mechanical strength tests and microscopic studies.

[0003] Nowadays, traditional indoor test devices for water and soil chemical leaching mostly use intact soil samples, and do not consider the impact of soil fissures on the effect of water chemistry. At the same time, due to problems with sample preparation and simulation technology of the fracture surface, it is difficult to carry out tests on the degradation of mechanical properties of the fracture surface due to water and soil chemical reactions. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a test device for simulating water-soil chemical reactions in cracked clay, which can simulate the development and evolution of water-soil chemical reactions in soil cracks to ensure the accurate implementation of subsequent physical and mechanical tests. It also provides a method for preparing cracked clay, which can quickly obtain cracked experimental soil samples.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] Disclosed is a test device for simulating water-soil chemical reactions in cracked clay, which is used for water-soil chemical reaction simulation tests and comprises a support, and a closed solution box, a leaching model and a collecting bottle which are sequentially placed on the support from top to bottom;

[0007] The leaching model includes a rectangular leaching box with a through and transparent top, and a rectangular test soil sample placed in the leaching box and containing cracks. The bottom of the leaching box is connected to the collecting bottle through a drainage pipe, and the bottom of the solution tank is respectively connected to a liquid outlet pipe and an air inlet pipe extending into the leaching box, and the horizontal height of the lowest end of the liquid outlet pipe is smaller than the horizontal height of the lowest end of the air inlet pipe.

[0008] Preferably, the test soil sample includes two sample blocks. When the two sample blocks are placed in the leaching box one by one, there is a gap between the two sample blocks to form a crack.

[0009] Preferably, the top of the solution box has an injection pipe for adding leaching solution, the injection pipe is provided with a ball valve, and the bottom of the solution box has through holes for installing a liquid outlet pipe and an air inlet pipe respectively.

[0010] Preferably, the bottom of the leaching box has a through hole for installing a drainage pipe, and two porous plates are arranged inside from top to bottom at intervals, and a space for arranging test soil samples is formed between the two porous plates.

[0011] Preferably, the porous plate close to the bottom of the leaching box is fixedly connected to the leaching box and has a gap with the bottom of the leaching box.

[0012] Preferably, the drain pipe is sealedly connected to the collecting bottle, and a top side of the collecting bottle is provided with an exhaust port, and the exhaust port is connected to a vacuum pump through an exhaust pipe.

[0013] Preferably, the leaching box is assembled by connecting five organic glass plates through nuts.

[0014] The utility model discloses a method for preparing a soil sample containing cracks for experiment, comprising the following steps:

[0015] S1: Obtain two sample blocks by striking with a sample striking device;

[0016] S2: Two sample blocks are placed in the leaching box one by one, and a geomembrane for simulating cracks is laid between the two sample blocks;

[0017] S3: Pull the geomembrane out of the leaching box to form a crack between the two sample blocks, and then obtain the test soil sample containing cracks.

[0018] The above-mentioned sample striking device includes a sample striking hammer and a rectangular sample striking box with a through top. The sample striking box is composed of five plates connected by nuts. The length and width of the sample striking cavity inside the sample striking box are equal to the length and width of the test soil sample.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The experimental device disclosed by the utility model has a simple structure and is easy to operate. The development and evolution process of water-soil chemical reactions in soil cracks can be simulated through the set leaching model. At the same time, during use, the leaching solution in the leaching model can be automatically supplemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the leaching model of the utility model after being cut apart along the length direction;

[0023] Figure 3 It is a structural schematic diagram of the leaching model of the utility model after being cut open along the width direction;

[0024] Figure 4 It is a schematic structural diagram of the sample striking device of the utility model when striking a sample;

[0025] Figure 5 It is a structural schematic diagram of the sample striking box of the utility model when striking samples.

[0026] Figure symbols: 1. bracket, 2. solution tank, 21. injection pipe, 3. leaching model, 31. leaching box, 32. test soil sample, 321. sample block, 322. crack, 33. porous plate, 4. collecting bottle, 5. drain pipe, 6. liquid outlet pipe, 7. air inlet pipe, 8. vacuum pump, 9. sample striking device, 91. sample striking hammer, 92. sample striking box. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0028] Example 1

[0029] like Figure 1-3 The test device for simulating water-soil chemical reactions in cracked clay shown in the figure is used for water-soil chemical reaction simulation tests, and comprises a support 1, and a closed solution box 2, a leaching model 3 and a collecting bottle 4 which are placed on the support 1 from top to bottom, wherein the solution box is used to load the leaching solution, the leaching model 3 is used to simulate the development and evolution process of water-soil chemical reactions in soil cracks, and the collecting bottle 4 is used to collect the leaching waste liquid discharged from the leaching model 3.

[0030] The leaching model 3 includes a rectangular leaching box 31 with a through and transparent top, and a rectangular test soil sample 32 placed in the leaching box 31 and containing a crack 322. The bottom of the leaching box 31 is connected to the collecting bottle 4 through a drainage pipe 5. The bottom of the solution tank 2 is respectively connected to a liquid outlet pipe 6 and an air inlet pipe 7 extending into the leaching box 31, and the horizontal height of the lowest end of the liquid outlet pipe 6 is less than the horizontal height of the lowest end of the air inlet pipe 7. Specifically, the bottom of the leaching box 31 has a through hole for installing the drainage pipe 5; the top of the solution tank 2 has The injection pipe 21 is used for adding leaching solution, and a ball valve is arranged on the injection pipe 21. The bottom of the solution tank 2 has through holes for installing the liquid outlet pipe 6 and the air inlet pipe 7 respectively. The set test soil sample 32 includes two sample blocks 321. When the two sample blocks 321 are placed one by one in the leaching box 31, there is a gap between the two sample blocks 321 to form a crack 322, so as to simulate the cracks in the soil body, and then when conducting the water-soil chemical action simulation test, the development and evolution process of the water-soil chemical action in the soil cracks can be simulated.

[0031] In specific implementation, the leaching solution is injected into the solution box 2 from the injection pipe 21, and the ball valve is closed after the leaching solution is injected to ensure that the solution box 2 is in a sealed environment. At the beginning of the test, the ball valve of the injection pipe 21 is opened to allow the leaching solution to enter the leaching box through the outlet pipe 6. When the liquid level of the solution in the leaching box exceeds the bottom height of the air inlet pipe 7, the ball valve of the injection pipe 21 is closed to start the leaching test. During the test, when the liquid level in the leaching box 31 is lower than the bottom height of the air inlet pipe 7, the outside air enters the solution box 2 from the air inlet pipe 7, and the internal air pressure of the solution box 2 increases at this time, and the leaching solution in the solution box 2 flows into the leaching box 31 from the outlet pipe 6. When the liquid level in the leaching box 31 rises to the same height as the discharge section of the air inlet pipe 7, the air inlet pipe 7 is sealed, and the outside air can no longer enter the solution box 2 from the air inlet pipe 7. At this time, the solution box 2 stops injecting the leaching solution into the leaching box 31. As the leaching test proceeds, the leaching solution in the leaching box 31 passes through the test soil sample 32 and is discharged into the collecting bottle 4 through the drain pipe 5. At this time, the liquid level in the leaching box 31 drops, and the outside air can enter the solution tank 2 from the air inlet pipe 7. The solution tank 2 injects the leaching solution into the leaching box 31 again, thereby achieving the purpose of automatically replenishing the leaching solution to the leaching box 31.

[0032] When the test soil sample 32 in the leaching box 31 has been leached for the preset time of water-soil chemical reaction, the test soil sample 32 is taken out of the leaching box 31, and the test soil sample 32 can be subsequently processed to carry out relevant physical mechanics and microscopic experimental research, specifically, two ring knife samples are cut from the test soil sample 32 after leaching, and when cutting the samples, the ring knife is guaranteed to cut the same thickness of soil up and down, so that the surface of the crack 322 is always in the middle; a group of direct shear specimens are cut from the test soil sample 32 after leaching, and the saturation of the cut ring knife samples is calculated after cutting, and the consolidation compression of the saturated ring knife samples is estimated through consolidation compression test before the ring knife samples for direct shear test are placed in the shear box, and filter paper of corresponding thickness is placed at the bottom of the shear box to ensure that the shear surface in the direct shear test is carried out along the preset crack surface. A direct shear test is carried out on the cut ring knife samples to explore the evolution law of the strength characteristics of fissured clay after water-soil chemical reaction.

[0033] It also includes cutting ring samples from the test soil sample 32 after leaching, and then separating the ring samples along the surface of the crack 322, taking the soil on the crack surface for microscopic testing and analysis such as X-ray diffraction test and XRF fluorescence spectrometer, so as to explore the changes in the mineral composition and chemical composition of the soil after water and soil chemical reaction.

[0034] As a preferred solution of the above embodiment, in order to prevent the test soil sample 32 from collapsing during leaching so as to block the through holes at the bottom of the leaching box 31 and the liquid outlet pipe 6 and the air inlet pipe 7, two porous plates 33 are arranged at intervals from top to bottom inside the leaching box 31, and a space for arranging the test soil sample 32 is formed between the two porous plates 33. Preferably, the porous plate 33 close to the bottom of the leaching box 31 is fixedly connected to the leaching box 31 and has a gap with the bottom of the leaching box 31 to prevent the porous plate 33 from blocking the through holes at the bottom of the leaching box 31.

[0035] As a preferred solution of the above embodiment, in order to improve the leaching efficiency, the drain pipe 5 is further sealed and connected to the collecting bottle 4. The top side of the collecting bottle 4 is provided with an exhaust port, and the exhaust port is connected to a vacuum pump 8 through an exhaust pipe. The gas in the collecting bottle 4 is extracted by the vacuum pump 8, so that a negative pressure environment is formed in the bottle, thereby making it easier for the leaching solution to pass through the experimental soil sample 32, thereby shortening the leaching time.

[0036] As a preferred solution of the above embodiment, in order to facilitate taking out the test soil sample 32 after the leaching test in the leaching box 31, the leaching box 31 is assembled by connecting five organic glass plates through nuts.

[0037] The leaching device disclosed in the utility model has a simple structure. The leaching model 3 is set to simulate the development and evolution process of water-soil chemical action in soil cracks. During use, the leaching solution in the leaching model 3 can be automatically supplemented.

[0038] Example 2

[0039] The method for preparing the above-mentioned soil sample containing cracks for testing comprises the following steps:

[0040] S1: Obtain two sample blocks 321 by striking with the sample striking device 9;

[0041] S2: two sample blocks 321 are placed one by one into the leaching box 31, and a geomembrane for simulating the crack 322 is laid between the two sample blocks 321. The geomembrane is used to simulate the crack 322 of the test soil sample 3, and its thickness is equal to the gap of the crack 322;

[0042] S3: The geomembrane is pulled out of the leaching box 31 to form cracks 322 between the sample blocks 321, and the test soil sample 32 containing the cracks 322 can be obtained.

[0043] Preferably, before placing the sample block 321 into the leaching box 31, a layer of vaseline is applied on the wall of the leaching box 31 to facilitate the subsequent removal of the leached test soil sample 3.

[0044] like Figure 4-5As shown, the above-mentioned sampling device 9 includes a sampling hammer 91 and a rectangular sampling box 92 with a through top. The sampling box 92 is composed of five plates connected by nuts. The length and width of the sampling cavity inside the sampling box are equal to the length and width of the test soil sample 32. During implementation, the soil is placed in the sampling box 92 and compacted by the sampling hammer 91 to obtain a sample block 321.

[0045] Of course, the present invention may have many other implementation modes. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A test device for simulating water and soil chemical reactions in cracked clay, used for water and soil chemical reaction simulation tests, characterized in that: It comprises a support (1), and a closed solution box (2), a leaching model (3) and a collection bottle (4) which are sequentially placed on the support (1) from top to bottom; The leaching model (3) comprises a rectangular leaching box (31) with a through and transparent top, and a rectangular test soil sample (32) placed in the leaching box (31) and containing a crack (322); the bottom of the leaching box (31) is connected to a collecting bottle (4) via a liquid discharge pipe (5); the bottom of the solution tank (2) is respectively connected to a liquid outlet pipe (6) and an air inlet pipe (7) extending into the leaching box (31); and the lowest end of the liquid outlet pipe (6) is lower than the lowest end of the air inlet pipe (7).

2. The test device according to claim 1, characterized in that: The test soil sample (32) includes two sample blocks (321). When the two sample blocks (321) are placed in the leaching box (31) one by one, a gap is formed between the two sample blocks (321) to form the crack (322).

3. The test device according to claim 1, characterized in that: The top of the solution box (2) is provided with an injection pipe (21) for injecting leaching solution, and a ball valve is provided on the injection pipe (21). The bottom of the solution box (2) is provided with through holes for installing a liquid outlet pipe (6) and an air inlet pipe (7) respectively.

4. The test device according to claim 1, characterized in that: The bottom of the leaching box (31) has a through hole for installing a drainage pipe (5), and two porous plates (33) are arranged in an interval from top to bottom inside, and a space for arranging the test soil sample (32) is formed between the two porous plates (33).

5. The test device according to claim 4, characterized in that: The porous plate (33) close to the bottom of the leaching box (31) is fixedly connected to the leaching box (31) and has a gap with the bottom of the leaching box (31).

6. The test device according to claim 1, characterized in that: The liquid discharge pipe (5) is sealedly connected to the collecting bottle (4); one side of the top of the collecting bottle (4) is provided with an exhaust port, and the exhaust port is connected to a vacuum pump (8) via an exhaust pipe.

7. The test device according to any one of claims 1 to 6, characterized in that: The leaching box (31) is assembled by connecting five organic glass plates through nuts.

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