Mixed buffer backfill material erosion test device and test method

Abstract

The present invention discloses a mixed buffer backfill material corrosion test device and a test method thereof, which relates to the field of corrosion test, and includes: at least one mold assembly, in which a test sample is arranged; a solution supply device, which includes at least one solution supply container, each of which is provided with seepage liquid; a solution collecting device, which includes at least one solution collecting container, the solution supply container, the solution collecting container and the mold assembly correspond to each other, and the solution supply container, the mold assembly and the solution collecting container are connected in sequence; a solution driving device for driving the movement of the seepage liquid, each of which is connected to the solution driving device; a weighing assembly, which includes at least one weighing device, the weighing device corresponds to the solution collecting container one by one, and the weighing device is used to weigh the weight of the solution collected by the corresponding solution collecting container. The device can simulate the corrosion process of the mixed buffer backfill material.

Description

Technical Field

[0001] The invention relates to the technical field of erosion testing, in particular to a mixed buffer backfill material erosion testing device and a testing method thereof. Background Art

[0002] In the engineering barrier system for deep geological disposal of high-level radioactive waste, buffer backfill materials refer to the materials filled between waste containers and between waste containers and geological bodies. The main component or base material of mixed buffer backfill materials is bentonite, which is a commonly used clay material that acts as a hydraulic barrier, chemical barrier and mechanical buffer. The erosion of mixed buffer backfill materials is a complex process, which is affected by many factors, such as the expansibility, permeability and colloidal properties of bentonite, the mechanical and hydraulic properties of the surrounding rock, the width, depth and side wall surface characteristics (such as roughness) of the surrounding rock cracks, the chemical composition, flow rate and flow rate of groundwater, etc., and each factor is closely related to each other. At present, there is a lack of corresponding test equipment in the study of mixed buffer backfill material erosion. Therefore, how to provide a mixed buffer backfill material erosion test device that can simulate the erosion process of mixed buffer backfill materials has become a problem that technicians in this field urgently need to solve. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a mixed buffer backfill material erosion test device and a test method thereof which can simulate the erosion process of the mixed buffer backfill material.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a mixed buffer backfill material erosion test device, comprising: at least one mold assembly, the mold assembly comprising a first clamping structure, a second clamping structure and a mold body arranged between the first clamping structure and the second clamping structure, the mold body comprising at least one sample mold connected in sequence, the sample mold comprising a sample container and a water-permeable structure, the first end of the sample container is provided with a first opening, the second end of the sample container is provided with a second opening for accommodating the water-permeable structure, the sample container is used to accommodate a test sample, the test sample comprises bentonite and granular material mixed with each other, the pores of the water-permeable structure are larger than the particle size of the bentonite and smaller than the particle size of the granular material; a solution supply device, the solution supply device comprising at least one solution A supply container, wherein the solution supply container corresponds to the mold assembly one-to-one, and each solution supply container is provided with seepage liquid inside; a solution collecting device, wherein the solution collecting device comprises at least one solution collecting container, wherein the solution collecting container corresponds to the mold assembly one-to-one, and the solution supply container, the first clamping structure, the mold body, the second clamping structure and the solution collecting container are connected in sequence; a solution driving device, wherein each solution supply container is connected to the solution driving device, and the solution driving device is used to drive the seepage liquid to move; a weighing assembly, wherein the weighing assembly comprises at least one weighing device, wherein the weighing device corresponds to the solution collecting container one-to-one, and the weighing device is used to weigh the weight of the solution collected by the corresponding solution collecting container.

[0006] Preferably, the sample mold is a cylindrical structure, and the sample mold includes two symmetrically arranged semi-cylindrical molds.

[0007] Preferably, the mold assembly also includes a support assembly and a fastening pad, and the support assembly, the fastening pad and the sample mold correspond to each other one by one. The support assembly is sleeved on the outside of the sample mold, and the fastening pad is arranged on the inner side wall of the support assembly, and the fastening pad is used to hold the sample mold tightly.

[0008] Preferably, the support assembly, the fastening pad and the sample container are all made of transparent material.

[0009] Preferably, the solution driving device includes a gas cylinder, a sealed container, a first pressure gauge and a second pressure gauge, each of the solution supply containers is arranged in the sealed container, and each of the solution supply containers is connected to the sealed container, the gas cylinder is connected to the sealed container, the first pressure gauge is used to detect the gas pressure output by the gas cylinder, and the second pressure gauge is used to detect the internal pressure of the sealed container.

[0010] Preferably, the mold assembly further comprises a connecting bolt, a first end of which is provided with a nut, and a second end of the connecting bolt passes through the first clamping structure and the second clamping structure in sequence and is tightened and fixed by a nut.

[0011] Preferably, the mold assembly also includes a liquid inlet pipe, a liquid outlet pipe, a liquid inlet valve and a liquid outlet valve, the solution supply container, the liquid inlet pipe, the first clamping structure, the mold body, the second clamping structure, the liquid outlet pipe and the solution collection container are connected in sequence, the liquid inlet valve is arranged on the liquid inlet pipe, and the liquid outlet valve is arranged on the liquid outlet pipe.

[0012] Preferably, the first end and the second end of the sample container are respectively provided with a first sealing ring and a second sealing ring, a limiting step for limiting axial movement of the water permeable structure is provided inside the sample container, and a third sealing ring is provided between the water permeable structure and the limiting step.

[0013] Preferably, the granular material is quartz sand.

[0014] The present invention also provides a test method for the mixed buffer backfill material erosion test device, comprising the following steps: determining the critical ratio of the bentonite to the granular material when the bentonite can swell and block the permeable structure and no erosion occurs, setting a plurality of the mold assemblies, and the ratio of the bentonite to the granular material of the test samples in different mold assemblies is different; studying the relationship between the seepage length and the erosion of the test samples, setting a plurality of the mold assemblies, and the number of sample molds in different mold assemblies is different; studying the relationship between the roughness of the inner wall of the sample container and the seepage path, the seepage length and the ratio of the bentonite to the granular material, setting a plurality of the mold assemblies, and the roughness of the inner wall of the sample container in different mold assemblies is different; studying the influence of the type, concentration and flow rate of the seepage fluid on the erosion of the test samples, setting a plurality of the mold assemblies, and the type, concentration and flow rate of the seepage fluid in different mold assemblies are all different.

[0015] Compared with the prior art, the present invention has achieved the following technical effects:

[0016] The mixed buffer backfill material erosion test device provided by the present invention comprises: at least one mold assembly, the mold assembly comprises a first clamping structure, a second clamping structure and a mold body arranged between the first clamping structure and the second clamping structure, the mold body comprises at least one sample mold connected in sequence, the sample mold comprises a sample container and a water-permeable structure, the first end of the sample container is provided with a first opening, the second end of the sample container is provided with a second opening for accommodating the water-permeable structure, the sample container is used to accommodate a test sample, the test sample comprises bentonite and granular material mixed with each other, the pores of the water-permeable structure are larger than the particle size of the bentonite and smaller than the particle size of the granular material; a solution supply device, the solution supply device comprises The mold body comprises at least one solution supply container, the solution supply container corresponds to the mold assembly one by one, and each solution supply container is provided with seepage liquid; a solution collecting device, the solution collecting device comprises at least one solution collecting container, the solution collecting container corresponds to the mold assembly one by one, and the solution supply container, the first clamping structure, the mold body, the second clamping structure and the solution collecting container are connected in sequence; a solution driving device, each solution supply container is connected to the solution driving device, and the solution driving device is used to drive the seepage liquid to move; a weighing component, the weighing component comprises at least one weighing device, the weighing device corresponds to the solution collecting container one by one, and the weighing device is used to weigh the weight of the corresponding solution collecting container.

[0017] By setting multiple mold assemblies and making the ratio of bentonite and granular material of the test samples in different mold assemblies different, the critical ratio of bentonite and granular material when bentonite can expand and block the permeable structure without erosion can be determined; by setting multiple mold assemblies and making the number of sample molds in different mold assemblies different, the relationship between the seepage length and the erosion of the test sample can be studied; by setting multiple mold assemblies and making the roughness of the inner wall of the sample container in different mold assemblies different, the relationship between the roughness of the inner wall of the sample container and the seepage path, seepage length and the ratio of bentonite and granular material can be studied; by setting multiple mold assemblies and making the type, concentration and flow rate of the seepage liquid in different mold assemblies different, the influence of the type, concentration and flow rate of the seepage liquid on the erosion of the test sample can be studied. In this way, the mixed buffer backfill material erosion test device can simulate the erosion process of the mixed buffer backfill material. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1It is a structural schematic diagram of a mixed buffer backfill material erosion test device provided in an embodiment of the present invention;

[0020] Figure 2 It is a structural schematic diagram of a mold assembly provided in an embodiment of the present invention;

[0021] Figure 3 is a cross-sectional view of a sample container provided in an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of the arrangement of the wave-shaped protrusions provided in an embodiment of the present invention;

[0023] Figure 5 It is a schematic structural diagram of a support assembly provided in an embodiment of the present invention.

[0024] Explanation of the reference numerals: 100, mixed buffer backfill material erosion test device; 1, mold assembly; 101, first clamping structure; 102, second clamping structure; 103, sample mold; 1031, sample container; 1032, water-permeable structure; 1033, first sealing ring; 1034, second sealing ring; 1035, third sealing ring; 1036, first protrusion; 1037, wave-shaped protrusion; 104, support assembly; 1041, semi-cylindrical support; 105, connecting bolt; 106, nut; 107, liquid inlet pipe; 108, liquid outlet pipe; 109, liquid inlet valve; 110, liquid outlet valve; 111, fastening pad; 1111, semi-cylindrical fastening pad; 2, solution supply container; 3, solution collecting device; 4, weighing device; 5, gas cylinder; 6, closed container; 7, first pressure gauge; 8, second pressure gauge; 9, ventilation pipe. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The purpose of the present invention is to provide a mixed buffer backfill material erosion test device and a test method thereof which can simulate the bentonite erosion process.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] refer to Figure 1-Figure 5As shown, this embodiment provides a mixed buffer backfill material erosion test device 100, comprising: at least one mold assembly 1, the mold assembly 1 comprises a first clamping structure 101, a second clamping structure 102 and a mold body arranged between the first clamping structure 101 and the second clamping structure 102, the mold body comprises at least one sample mold 103 connected in sequence, the sample mold 103 comprises a sample container 1031 and a water-permeable structure 1032, the first end of the sample container 1031 is provided with a first opening, the second end of the sample container 1031 is provided with a second opening for accommodating the water-permeable structure 1032, the sample container 1031 is used to accommodate a test sample, the test sample comprises bentonite and granular material mixed with each other, the pores of the water-permeable structure 1032 are larger than the particle size of the bentonite and smaller than the particle size of the granular material The particle size of the solution supply device includes at least one solution supply container 2, which corresponds to the mold assembly 1 one by one, and each solution supply container 2 is provided with a seepage liquid inside; the solution collecting device 3 includes at least one solution collecting container, which corresponds to the mold assembly 1 one by one, and the solution supply container 2, the first clamping structure 101, the mold body, the second clamping structure 102 and the solution collecting container are connected in sequence; the solution driving device, each solution supply container 2 is connected to the solution driving device, and the solution driving device is used to drive the seepage liquid to move; the weighing component includes at least one weighing device 4, which corresponds to the solution collecting container one by one, and the weighing device 4 is used to weigh the weight of the solution collected by the corresponding solution collecting container. The mixed buffer backfill material erosion test device 100 can simulate the erosion process of the mixed buffer backfill material.

[0029] Specifically in this embodiment, the permeable structure 1032 is a permeable gasket, and the permeable gasket is a large-pore stainless steel sintered mesh with a thickness of 1.7 mm. The permeable structure 1032 simulates the cracks in the surrounding rock. The permeable structure 1032 can also use a granite gasket with artificial cracks. The pores of the large-pore stainless steel sintered mesh and the granite gasket can only pass through bentonite particles, not granular materials. The permeable gasket is soaked in deionized water, ultrasonically cleaned, and then dried.

[0030] Specifically in this embodiment, the first clamping structure 101 is a first clamping plate, and the second clamping structure 102 is a second clamping plate.

[0031] In this embodiment, if Figure 3-Figure 4 As shown, the sample mold 103 is a cylindrical structure, and the sample mold 103 includes two symmetrically arranged semi-cylindrical molds.

[0032] In this embodiment, for the convenience of connection, the first protrusion 1036 and the second protrusion are symmetrically arranged on both sides of the semi-cylindrical mold, and the two first protrusions 1036 and the two second protrusions are connected by bolts. Further, in order to prevent leakage of the seepage liquid, the two opposite end surfaces of the two first protrusions 1036 are provided with a first sealing strip, and the two opposite end surfaces of the two second protrusions are provided with a second sealing strip, and the two first sealing strips are arranged oppositely, and the two second sealing strips are arranged oppositely.

[0033] In this embodiment, if Figure 2 As shown, the mold assembly 1 also includes a support assembly 104 and a fastening pad 111. The support assembly 104, the fastening pad 111 and the sample mold 103 correspond to each other one by one. The support assembly 104 is sleeved on the outside of the sample mold 103, and the fastening pad 111 is arranged on the inner wall of the support assembly 104. The fastening pad 111 is used to hold the sample mold 103 tightly to ensure that the sampling position is not offset during the test disassembly.

[0034] Furthermore, if Figure 5 As shown, the support assembly 104 includes two symmetrically arranged and detachably connected semi-cylindrical supports 1041, the two semi-cylindrical supports 1041 correspond to the two semi-cylindrical molds one by one, the two semi-cylindrical molds are respectively clamped in the corresponding semi-cylindrical supports 1041, and the two semi-cylindrical supports 1041 are connected by fastening bolts. Correspondingly, the fastening pad 111 includes two symmetrically arranged semi-cylindrical fastening pads 1111. The fastening pad 111 and the support assembly 104 are bolted to the sample mold 103 to fix the relative position between the support assembly 104 and the sample mold 103.

[0035] In this embodiment, in order to facilitate observation of the test situation, the support assembly 104, the fastening pad 111 and the sample container 1031 are all made of transparent materials. Specifically, in this embodiment, the support assembly 104 and the sample container are made of high-transparency organic glass, and the fastening pad 111 is made of transparent rubber.

[0036] In this embodiment, specifically, the solution supply container 2 is a liquid inlet pipe 107, the solution collection container is a liquid collecting bottle, and each liquid collecting bottle is provided with a vent pipe 9, and the weighing device 4 is an electronic balance.

[0037] In this embodiment, if Figure 1 As shown, the solution driving device includes a gas cylinder 5, a closed container 6, a first pressure gauge 7 and a second pressure gauge 8. Each solution supply container 2 is arranged in the closed container 6, and each solution supply container 2 is connected to the closed container 6. The gas cylinder 5 is connected to the closed container 6. The first pressure gauge 7 is used to detect the gas pressure output by the gas cylinder 5, and the second pressure gauge 8 is used to detect the internal pressure of the closed container 6.

[0038] In this embodiment, if Figure 2 As shown, the mold assembly 1 also includes a connecting bolt 105 , a nut is provided at the first end of the connecting bolt 105 , and the second end of the connecting bolt 105 passes through the first clamping structure and the second clamping structure 102 in sequence and is tightened and fixed by a nut 106 .

[0039] In this embodiment, there are multiple connecting bolts 105, and the multiple connecting bolts 105 are evenly arranged along the circumference of the mold body. In this embodiment, the number of the connecting bolts 105 is specifically four.

[0040] In this embodiment, if Figure 2 As shown, the mold assembly 1 also includes a liquid inlet pipe 107, a liquid outlet pipe 108, a liquid inlet valve 109 and a liquid outlet valve 110. The solution supply container 2, the liquid inlet pipe 107, the first clamping structure 101, the mold body, the second clamping structure 102, the liquid outlet pipe 108 and the solution collecting container are connected in sequence. The liquid inlet valve 109 is arranged on the liquid inlet pipe 107, and the liquid outlet valve 110 is arranged on the liquid outlet pipe 108. The liquid inlet valve 109 is used to control the opening or closing of the liquid inlet pipe 107, and the liquid outlet valve 110 is used to control the opening or closing of the liquid outlet pipe 108.

[0041] In this embodiment, the first end and the second end of the sample container 1031 are respectively provided with a first sealing ring 1033 and a second sealing ring 1034, a limiting step for limiting the axial movement of the water permeable structure 1032 is provided inside the sample container 1031, and a third sealing ring 1035 is provided between the water permeable structure 1032 and the limiting step.

[0042] In this embodiment, the granular material is quartz sand. It should be noted that the granular material refers to a material with a particle size larger than that of bentonite, and is not limited to quartz sand, which is only an example.

[0043] In this embodiment, the electronic balance is connected to the computer for communication, and the electronic balance transmits the measured data to the computer.

[0044] The test method of the mixed buffer backfill material erosion test device 100 provided in this embodiment includes the following steps: determining the critical ratio of bentonite to granular material when bentonite can swell and block the permeable structure 1032 and no erosion occurs, setting multiple mold assemblies 1, and the ratio of bentonite to granular material of the test samples in different mold assemblies 1 is different; studying the relationship between the seepage length and the erosion of the test samples, setting multiple mold assemblies 1, and the number of sample molds in different mold assemblies 1 is different; studying the relationship between the roughness of the inner wall of the sample container 1031 and the seepage path, seepage length and the ratio of bentonite to granular material, setting multiple mold assemblies 1, and the roughness of the inner wall of the sample container 1031 in different mold assemblies 1 is different; studying the influence of the type, concentration and flow rate of the seepage fluid on the erosion of the test sample, setting multiple mold assemblies 1, and the type, concentration and flow rate of the seepage fluid in different mold assemblies 1 are all different.

[0045] Specifically in this embodiment, the roughness of the mold container can be changed by providing a wave-shaped protrusion 1037 on the inner wall of the mold container, but the method is not limited to changing the roughness of the mold container in this way.

[0046] The following is a further description of the test method of the mixed buffer backfill material erosion test device 100 provided in this embodiment in combination with detailed test steps. The mixed buffer backfill material erosion test device 100 on which the test method is based specifically includes four mold assemblies 1, and each of the mold assemblies 1 is provided with 6 sample molds 103.

[0047] Step 1: Sample compression

[0048] Select bentonite, use the spray method to humidify the bentonite powder to a moisture content of 16% to 18% and seal it for more than 240 hours. Use it after the moisture content is uniform. Measure the height and inner diameter of the sample mold 103, fix the support assembly 104 on each sample mold 103, weigh the mass of each set of mold assembly 1, and record it separately, and then disassemble the support assembly 104. Weigh a certain proportion of bentonite and quartz sand according to the calculated density and mix them well. Use a small pressure testing machine and sample mold 103 to prepare a φ50mm×50mm compacted test sample by uniaxial compaction method. The compression rate is 2mm / min and the load holding time is 20min. Put the compacted test sample into each sample mold 103.

[0049] Step 2: Test device installation

[0050] (1) Loosen the connecting bolts 105 of the four sets of mold assemblies 1 respectively and remove the sample mold 103;

[0051] (2) Fixing the six support assemblies 104 on the six sample molds 103 respectively;

[0052] (3) The six sample molds 103 are connected in sequence and arranged between the first clamping structure 101 and the second clamping structure 102. Then, the second end of the connecting bolt 105 passes through the first clamping structure 101 and the second clamping structure 102 in sequence and is tightened and fixed by the nut 106.

[0053] (4) One end of the liquid inlet pipe 107 is connected to the first clamping structure 101, and the other end is connected to the solution supply container 2, and the liquid inlet valve 109 is closed; one end of the liquid outlet pipe 108 is connected to the second clamping structure 102, and the other end is connected to the solution collection container, and the liquid outlet valve 110 is closed, and an electronic balance is placed under the solution collection container;

[0054] (5) Connecting the electronic balance to the computer for communication;

[0055] (6) First open the liquid inlet valve 109, then open the liquid outlet valve 110;

[0056] (7) Turn on the computer and start receiving and recording the data measured by the electronic balance;

[0057] (8) Unscrew the switch of the gas cylinder 5. When the first pressure gauge 7 shows a value slightly less than 0.01Mpa, stop and observe the change in the value displayed by the second pressure gauge 8. When the value of the second pressure gauge 8 does not change, it means that the pipeline is sealed and intact and can meet the test requirements. If the value of the second pressure gauge 8 decreases, it means that there is a gas leak in the pipeline and it needs to be repaired. After the repair, check the pipeline sealing again;

[0058] (9) After ensuring that the pipeline is airtight, fine-tune the switch of the gas cylinder 5 so that the second pressure gauge 8 reaches the required pressure of 0.01 MPa for the test.

[0059] Step 3: Experimental Phase

[0060] (1) At the beginning of the test, the turbidity, conductivity, pH value and material composition of the collected solution in the solution collection container shall be measured every 6 hours. When the turbidity value is between 0 and 10, and the conductivity, pH value and material composition no longer change, the turbidity, conductivity, pH value and material composition of the collected solution can be measured every 24 hours;

[0061] (2) Each time the solution collection container is full, the mass of the collected solution is recorded, the collected solution is dried, and the collected solution is sorted by time;

[0062] (3) Observe the changes in the value of the electronic balance. When the mass value does not change when the solution collection container is full within 72 hours, and the measured turbidity, conductivity, pH value and material composition are also fixed, the test can be paused, and the air pressure value is changed to 0.05Mpa and started again. The collected solution collected before the air pressure value is changed is dried and weighed, and its composition is measured. The air pressure value can be changed multiple times according to the required permeate flow rate. Repeat steps 3 (1) and (2);

[0063] (4) When the solution collection container is full and the mass value does not change within 72 hours and the measured turbidity, conductivity, pH value and material composition are also fixed, stop the test and dismantle the container. Dry and weigh the collected solution after changing the air pressure value to measure its composition.

[0064] Step 4: Dismantling

[0065] First, turn off the switch of the gas cylinder 5, and when the value of the second pressure gauge 8 drops to zero, the seepage liquid stops flowing. Then proceed as follows:

[0066] (1) First, close the liquid inlet valve 109 and separate the liquid inlet pipe 107 from the solution supply container 2 to ensure that the permeate is not affected by gravity and flows into the mold body again through the liquid inlet pipe 107;

[0067] (2) then closing the liquid outlet valve 110 and separating the liquid outlet pipe 108 from the solution collection container to ensure that the seepage liquid flows into the mold body through the liquid outlet pipe 108 without being affected by gravity;

[0068] (3) Unscrew the nut 106 and separate the six sample molds 103. The fastening bolts of the support assembly 104 on each sample mold 103 are not loosened. Ensure that the relative positions of the six sample molds 103 in the horizontal direction remain unchanged and are numbered from left to right as No. 1 to No. 6. Each group of mold assemblies separated must be weighed.

[0069] (4) The test samples in each group of sample molds 103 are divided into 6 equal parts through the center of the circle and numbered respectively, and 6 samples are taken from each part and numbered respectively.

[0070] Step 5: Data processing

[0071] (1) Corresponding the mass, detection components and time schedule of the seepage sample obtained by drying the solution collected in the solution collection container each time, and drawing a curve;

[0072] (2) Compare the quality and composition of the seepage samples obtained by drying the collected solution before and after changing the gas pressure value to confirm the effect of the seepage fluid flow rate on the erosion of the mixed buffer backfill material;

[0073] (3) By weighing the mass of the sample mold 103 in sequence, the wet weight and moisture content of the test sample can be calculated, and then the wet density of the test sample can be calculated based on the height and diameter of the sample mold 103 measured at the beginning;

[0074] (4) The moisture content and composition of 36 samples taken from each group of mold components 1 are measured respectively, and the position number of each sample is clearly marked. The seepage length and the ratio of bentonite and quartz sand are determined according to the moisture content and composition of each sample.

[0075] The device and experimental method are also applicable to the test of adding other substances or replacing the test samples. It can also be used to conduct horizontal comparative tests on multiple groups of test solutions (permeate) with unchanged flow rate, but changing the test samples, solution types or the internal structure of the sample mold 103; it can also be used to conduct horizontal comparative tests on the test samples with unchanged test samples, but changing the solution types, solution flow rates or the internal structure of the sample mold 103; it can also be used to conduct horizontal comparative tests on the internal structure of the sample mold 103 with unchanged test samples, solution flow rates or solution types; and it can also be used to conduct horizontal comparative tests with one of the conditions unchanged and the other two changed.

[0076] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A mixed buffer backfill material erosion test device, It is characterized in that include: At least one mold assembly, the mold assembly includes a first clamping structure, a second clamping structure and a mold body arranged between the first clamping structure and the second clamping structure, the mold body includes at least one sample mold connected in sequence, the sample mold includes a sample container and a water-permeable structure, the first end of the sample container is provided with a first opening, the second end of the sample container is provided with a second opening for accommodating the water-permeable structure, the sample container is used to accommodate a test sample, the test sample includes bentonite and granular material mixed with each other, the pores of the water-permeable structure are larger than the particle size of the bentonite and smaller than the particle size of the granular material, and the inner wall of the sample container is provided with a wavy protrusion; A solution supply device, the solution supply device comprising at least one solution supply container, the solution supply containers corresponding to the mold assemblies one by one, and each solution supply container is provided with a seepage liquid; A solution collecting device, the solution collecting device comprising at least one solution collecting container, the solution collecting container corresponding to the mold assembly one by one, the solution supply container, the first clamping structure, the mold body, the second clamping structure and the solution collecting container being connected in sequence; A solution driving device, each of the solution supply containers is connected to the solution driving device, and the solution driving device is used to drive the permeate to move; A weighing component, wherein the weighing component comprises at least one weighing device, wherein the weighing device corresponds to the solution collecting container one by one, and the weighing device is used to weigh the weight of the solution collected in the corresponding solution collecting container.

2. The mixed buffer backfill material erosion test device according to claim 1, It is characterized in that The sample mold is a cylindrical structure, and the sample mold includes two symmetrically arranged semi-cylindrical molds.

3. The mixed buffer backfill material erosion test device according to claim 2, It is characterized in that The mold assembly also includes a support assembly and a fastening pad. The support assembly, the fastening pad and the sample mold correspond to each other one by one. The support assembly is sleeved on the outside of the sample mold, and the fastening pad is arranged on the inner side wall of the support assembly. The fastening pad is used to hold the sample mold tightly.

4. The mixed buffer backfill material erosion test device according to claim 3, It is characterized in that The support assembly, the fastening pad and the sample container are all made of transparent material.

5. The mixed buffer backfill material erosion test device according to claim 1, It is characterized in that The solution driving device includes a gas cylinder, a sealed container, a first pressure gauge and a second pressure gauge. Each of the solution supply containers is arranged in the sealed container, and each of the solution supply containers is connected to the sealed container. The gas cylinder is connected to the sealed container. The first pressure gauge is used to detect the gas pressure output by the gas cylinder, and the second pressure gauge is used to detect the internal pressure of the sealed container.

6. The mixed buffer backfill material erosion test device according to claim 1, It is characterized in that The mold assembly also includes a connecting bolt, a first end of which is provided with a nut, and a second end of the connecting bolt passes through the first clamping structure and the second clamping structure in sequence and is tightened and fixed by a nut.

7. The mixed buffer backfill material erosion test device according to claim 1, It is characterized in that The mold assembly also includes a liquid inlet pipe, a liquid outlet pipe, a liquid inlet valve and a liquid outlet valve. The solution supply container, the liquid inlet pipe, the first clamping structure, the mold body, the second clamping structure, the liquid outlet pipe and the solution collection container are connected in sequence. The liquid inlet valve is arranged on the liquid inlet pipe, and the liquid outlet valve is arranged on the liquid outlet pipe.

8. The mixed buffer backfill material erosion test device according to claim 1, It is characterized in that The first end and the second end of the sample container are respectively provided with a first sealing ring and a second sealing ring, a limiting step for limiting the axial movement of the water permeable structure is provided inside the sample container, and a third sealing ring is provided between the water permeable structure and the limiting step.

9. The mixed buffer backfill material erosion test device according to claim 1, It is characterized in that The granular material is quartz sand.

10. A test method for the mixed buffer backfill material erosion test device according to any one of claims 1 to 9, It is characterized in that The following steps are involved: Determine a critical ratio of the bentonite to the granular material when the bentonite can swell and seal the water-permeable structure without erosion, and set a plurality of the mold assemblies, wherein the ratio of the bentonite to the granular material of the test samples in different mold assemblies is different; Studying the relationship between the seepage length and the erosion of the test sample, setting a plurality of the mold assemblies, and different mold assemblies have different numbers of the sample molds; Studying the relationship between the roughness of the inner wall of the sample container and the seepage path, the seepage length, and the ratio of the bentonite to the granular material, setting a plurality of the mold assemblies, and the roughness of the inner wall of the sample container in different mold assemblies is different; To study the influence of the type, concentration and flow rate of the seepage fluid on the erosion of the test sample, a plurality of the mold assemblies are provided, and the type, concentration and flow rate of the seepage fluid in different mold assemblies are different.

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