CN114353736B - Method for testing free expansion rate of compacted bentonite - Google Patents
Method for testing free expansion rate of compacted bentonite Download PDFInfo
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- CN114353736B CN114353736B CN202210010836.4A CN202210010836A CN114353736B CN 114353736 B CN114353736 B CN 114353736B CN 202210010836 A CN202210010836 A CN 202210010836A CN 114353736 B CN114353736 B CN 114353736B
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Abstract
The invention discloses a method for testing the free expansion rate of compacted bentonite, which comprises an expansion rate testing unit, wherein the expansion rate testing unit comprises a base, the top of the base is fixedly connected with a square measuring tank in a sealing way, the top of the square measuring tank is detachably connected with a top cover, each side wall of the square measuring tank is provided with a lateral dial indicator in a penetrating way, and the top of the base is provided with a permeable stone seat; according to the invention, through the arrangement of the four arc-shaped porous measuring plates, the free expansion of the compacted bentonite can be measured in multiple directions by matching with the permeable stone seat, the permeable Dan Gai, the top dial indicator and the four lateral dial indicators, and four cracks are formed on the side wall after the compacted bentonite column is wrapped by the four arc-shaped porous measuring plates by utilizing the mutual matching of the four porous measuring plates, and the four cracks can simulate the scene that groundwater invades from geological cracks to compact backfill bentonite in a real environment, so that the free expansion rate of the compacted bentonite which is more close to the original position under the action of the geological water is obtained.
Description
Technical Field
The invention relates to the technical field of environmental science research devices, in particular to a method for testing the free expansion rate of compacted bentonite, which is particularly suitable for testing the free expansion rate of compacted bentonite samples in various water environments.
Background
In the deep geological treatment of nuclear waste, in order to prevent radioactive waste from entering the natural environment, the container treatment structure generally adopts a multi-layer barrier system, comprising an artificial barrier formed by concrete, a packaging container and a buffer material and a natural barrier formed by surrounding rock, wherein the buffer backfill material is the last artificial barrier for the radioactive waste to enter the natural environment. Bentonite is considered to be the best cushioning backfill material due to its strong adsorptivity, low permeability, and good self-healing ability. Compacted bentonite in backfill structures may develop fissures under long-term natural forces (e.g., earthquakes, erosion, etc.), and the ability of these fissures to self-heal upon swelling with geological pore water is a key indicator for assessing the long-term safety of disposal reservoirs. Therefore, the laboratory studies the free expansion rate of compacted bentonite in different water chemistry environments, and the method has great significance.
The existing expansion rate testers in the market are all aimed at rock or soil samples, can only measure the expansion rate in a single direction, and are not suitable for testing the free expansion rate of compacted bentonite in water environment. How to accurately test the free expansion rate of compacted bentonite in water environment is a problem to be solved by the invention.
Disclosure of Invention
The invention aims to provide a method for testing free expansion rate of compacted bentonite, so as to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
(1) constructing a compaction bentonite free expansion rate testing device: the device comprises an expansion rate testing unit, wherein the expansion rate testing unit comprises a base, a square measuring pond is fixedly connected to the top of the base in a sealing manner, a top cover is detachably connected to the top of the square measuring pond, lateral dial indicators are arranged on all side walls of the square measuring pond in a penetrating manner, a permeable stone seat is arranged on the top of the base, the permeable stone seat is arranged on the inner side of the square measuring pond, cylindrical samples are arranged on the top of the permeable stone seat, four arc-shaped porous measuring plates are circumferentially distributed on the outer side of the cylindrical samples, the arc-shaped porous measuring plates are in one-to-one correspondence with the lateral dial indicators, permeable Dan Gai are arranged on the top of the cylindrical samples in a penetrating manner, and the measuring ends of the top dial indicators are abutted to the center of the top of the permeable Dan Gai;
(2) the method for testing the free expansion rate of the compacted bentonite comprises the following steps:
step one: water level adjustment: the simulated geological water solution in the first container is conveyed into the square measuring tank through the water supply pipe by the top cover, a valve positioned on a water drain pipe with a corresponding height is opened, redundant simulated geological water solution is led into the second container through the water drain pipe and the collecting pipe until the water level in the square measuring tank is stabilized at a required height, and the simulated geological water solution in the second container is conveyed back into the first container through the return pipe by the second water pump;
step two: and (3) temperature adjustment: when the water level in the square measuring pool reaches the required height, an electric heater is started to heat the simulated geological water solution in the square measuring pool through a temperature controller, the temperature controller automatically controls the switch of the electric heater through temperature feedback of a temperature sensor, when the temperature of the simulated geological water solution does not reach the specified temperature, the electric heater continuously heats, and when the simulated geological water solution reaches the specified temperature, the electric heater automatically shuts off heating so as to maintain the temperature of the simulated geological water solution constant;
step three: and (3) installing a sample: when the water temperature reaches the specified temperature, placing the assembled cylindrical sample, the porous elastic latex film and the arc porous measuring plate on the permeable stone seat, rapidly abutting the measuring ends of the four lateral dial indicators against the end parts of the corresponding measuring rods, fixing and zeroing the lateral dial indicators, then placing the permeable Dan Gai and the top cover, and fixing and zeroing the top dial indicator after the measuring ends of the top dial indicators abut against the top surface of the permeable Dan Gai;
step four: and (3) data recording: after the sample is installed, continuously recording the readings of the top dial indicator and the four lateral dial indicators at fixed time intervals, stopping data recording after the readings of each dial indicator are stable, stopping experiments, calculating the free expansion rate of the cylindrical sample in the water solution with specific temperature through experimental data and a calculation formula, and finally, accurately testing the free expansion rate of the cylindrical sample in the water solution;
the calculation formula is as follows:
in the calculation formula:
F f a free expansion ratio of the cylindrical sample (13);
r 0 is the diameter of a cylindrical sample (13) in mm;
h 0 is the height of the cylindrical sample (13) in mm;
r 1 、r 2 、r 3 、r 4 the unit is mm for the reading of four lateral dial indicators (10);
h s a reading of the top dial gauge (15) in mm;
pi is the circumference ratio.
As a further scheme of the invention: the inner surface and the side of the arc porous measuring plate are provided with water permeable holes which are communicated with each other, the outer surface of the arc porous measuring plate is uniformly and fixedly connected with four stress rods, the ends of the stress rods are fixedly connected with I-shaped bars together, the center of the outer wall of each I-shaped bar is fixedly connected with a measuring rod, and the ends of the measuring rods are propped against the measuring ends of the corresponding lateral dial gauges.
As a further scheme of the invention: the outer wall sleeve of cylindric sample sets up porous elastic latex membrane, the surface of porous elastic latex membrane is laminated with the interior surface of the porous measuring plate of arc.
As a further scheme of the invention: above-mentioned compaction bentonite free expansion rate testing arrangement still includes water supply unit, water supply unit includes first container, first container passes through delivery pipe and square measuring cell intercommunication, the delivery pipe runs through the outer wall in square measuring cell, install first water pump on the delivery pipe.
As a further scheme of the invention: above-mentioned compaction bentonite free expansion rate testing arrangement still includes drainage unit, drainage unit includes the second container, install the collecting pipe on the second container, the outer wall of square measuring cell runs through and is provided with a plurality of drain pipes, and is a plurality of the drain pipe all communicates with the collecting pipe, all install the valve on the drain pipe, a plurality of the drain pipe is from top to bottom equidistance on the surface of square measuring cell and distributes.
As a further scheme of the invention: the second container is communicated with the first container through a return pipe, and a second water pump is arranged on the return pipe.
As a further scheme of the invention: above-mentioned compaction bentonite free expansion rate testing arrangement still includes temperature regulation unit, temperature regulation unit includes temperature sensor, electric heater, temperature controller, temperature sensor runs through square measuring cell's outer wall bottom, electric heater is located the base, temperature sensor, electric heater all are connected with temperature controller electricity.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, through the arrangement of the four arc-shaped porous measuring plates, the free expansion of the compacted bentonite can be measured in multiple directions by matching with the permeable stone seat, the permeable Dan Gai, the top dial indicator and the four lateral dial indicators, and four cracks are formed on the side wall after the compacted bentonite column is wrapped by the four arc-shaped porous measuring plates by utilizing the mutual matching of the four porous measuring plates, and the four cracks can simulate the scene that groundwater invades from geological cracks to compact backfill bentonite in a real environment, so that the free expansion rate of the compacted bentonite which is more close to the original position under the action of the geological water is obtained, and the testing accuracy is high.
2. According to the invention, the porous elastic latex film is wrapped on the cylindrical sample by using the excellent elasticity and the small holes distributed on the surface of the porous elastic latex film, so that the cylindrical sample can be ensured not to collapse after being contacted with water for a long time and fully expanded.
3. According to the invention, the water level in the square measuring pool can be adjusted at any time according to experimental requirements by arranging the plurality of water drain pipes which are distributed at equal intervals, so that the free expansion rate test of the cylindrical sample under different water level burial depths is realized, and the influence research of different water solution temperatures on the free expansion rate of compacted bentonite is realized by arranging the temperature adjusting unit.
Drawings
Fig. 1 is a schematic structural diagram of a compacted bentonite free expansion rate testing device.
Fig. 2 is a schematic structural diagram of an expansion rate testing unit in the compacted bentonite free expansion rate testing device.
FIG. 3 is a schematic view of the mounting location of a porous elastomeric latex film in a compacted bentonite free swell ratio test apparatus.
FIG. 4A is a schematic view of a first view perspective of an arcuate porous measuring plate in a compacted bentonite free expansion ratio testing device;
fig. 4B is a schematic view of a second view perspective of the curved porous measuring plate in the compacted bentonite free expansion ratio testing device.
The expansion ratio testing unit 1, the base 2, the square measuring tank 3, the top cover 4, the arc-shaped porous measuring plate 5, the water permeable hole 6, the stress rod 7, the I-shaped strip 8, the measuring rod 9, the lateral dial indicator 10, the water permeable stone seat 11, the porous elastic latex film 12, the cylindrical sample 13, the water permeable Dan Gai 14, the top dial indicator 15, the drain pipe 16, the temperature sensor 17, the electric heater 18, the temperature controller 19, the water supply unit 20, the first container 21, the water supply pipe 22, the first water pump 23, the drain unit 24, the second container 25, the collecting pipe 26, the return pipe 27 and the second water pump 28.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 4, in the embodiment of the invention, a compacted bentonite free expansion rate testing device comprises an expansion rate testing unit 1, wherein the expansion rate testing unit 1 comprises a base 2, a square measuring tank 3 is fixedly connected to the top of the base 2 in a sealing manner, a top cover 4 is detachably connected to the top of the square measuring tank 3, lateral dial indicators 10 are arranged on all side walls of the square measuring tank 3 in a penetrating manner, a permeable stone seat 11 is arranged on the top of the base 2, the permeable stone seat 11 is positioned on the inner side of the square measuring tank 3, a cylindrical sample 13 is arranged on the top of the permeable stone seat 11, four arc-shaped porous measuring plates 5 are circumferentially distributed on the outer side of the cylindrical sample 13, the arc-shaped porous measuring plates 5 are in one-to-one correspondence with the lateral dial indicators 10, permeable Dan Gai 14 are arranged on the top of the cylindrical sample 13, a top dial indicator 15 is arranged on the top of the top cover 4 in a penetrating manner, and the measuring end of the top dial indicator 15 abuts against the top center of the permeable stone cover 14
In the above scheme, by arranging the permeable stone seat 11 and the permeable stone cover 14, the top and the bottom of the cylindrical sample 13 can be fully contacted and expanded with water, and meanwhile, the integrity of the top and the bottom of the expanded sample is ensured; the square measuring tank 3 is made of transparent organic glass, and can observe whether the experimental process is normal or not and whether the cylindrical sample 13 is complete or not in the experimental process or not in real time, so that the effectiveness of the experiment and the accuracy of the measuring result are ensured.
Specifically referring to fig. 4 (fig. 4A, fig. 4B), the material of the arc porous measurement board 5 is a light anti-corrosion organic material, it possesses characteristics such as acid and alkali corrosion resistance, high temperature resistance, hardness is high, be difficult for yielding, the permeable hole 6 of intercommunication has all been seted up to the internal surface and the side of the arc porous measurement board 5, the purpose of design is to prevent that cylindric sample 13 from putting into solution back and contacting with water fast, after four arc porous measurement boards 5 wrap up compaction bentonite post, can form four cracks at the lateral wall, this four cracks can simulate the scene that groundwater invaded compaction backfill bentonite from geological fissure under the real environment, thereby obtain the free expansion rate of the compaction bentonite of more pressing close to normal position under the effect of geological water, the even fixedly connected with of surface of the arc porous measurement board 5 four atress poles 7, four the tip common fixedly connected with I-shaped strip 8 of atress pole 7, the outer wall center department fixedly connected with measuring rod 9 of I-shaped strip 8, the tip of measuring rod 9 offsets with the measuring end of corresponding side micrometer 10.
The use of the arcuate porous measuring plate 5 serves three purposes, namely, the porous design ensures that the cylindrical sample 13 prepared from compacted bentonite swells sufficiently on contact with the aqueous solution around it; secondly, the four arc-shaped porous measuring plates 5 can wrap the side surfaces of the cylindrical sample 13 completely, and the integrity of the side surfaces of the cylindrical sample 13 after being corroded and expanded by water is guaranteed by the design of a hard arc; thirdly, each arc-shaped porous measuring plate 5 is contacted with four stress rods 7 to form stress points, sixteen stress points are formed, lateral expansion deformation induced by the sixteen stress points is transmitted to the corresponding lateral dial indicator 10 on average, and accuracy of lateral expansion rate measurement is guaranteed.
The outer wall sleeve of cylindric sample 13 sets up porous elastic latex membrane 12, the surface of porous elastic latex membrane 12 is laminated with the interior surface of arc porous measurement board 5.
The porous elastic latex film 12 can be elastically deformed greatly, countless small holes are distributed on the porous elastic latex film 12, the porous elastic latex film 12 is wrapped on the cylindrical sample 13, and the cylindrical sample 13 is ensured not to collapse after being contacted with water for a long time and fully expanded.
The inside diameter of the porous elastic latex film 12 in its natural state is 1-2mm smaller than the outside diameter of the cylindrical sample 13.
By adopting the above-described apparatus, the elastic properties of the porous elastic latex film 12 can be utilized to tightly coat the circumferential outer wall of the cylindrical sample 13.
The device for testing the free expansion rate of the compacted bentonite further comprises a water supply unit 20, wherein the water supply unit 20 comprises a first container 21, the first container 21 is communicated with the square measuring tank 3 through a water supply pipe 22, the water supply pipe 22 penetrates through the outer wall of the square measuring tank 3, and a first water pump 23 is arranged on the water supply pipe 22.
Above-mentioned compaction bentonite free expansion rate testing arrangement, still includes drainage unit 24, drainage unit 24 includes second container 25, install collecting pipe 26 on the second container 25, the outer wall of square measuring cell 3 runs through and is provided with a plurality of drain pipes 16, a plurality of drain pipes 16 all communicate with collecting pipe 26, all install the valve on the drain pipe 16, a plurality of drain pipes 16 are from top to bottom equidistant distribution on the surface of square measuring cell 3, and preferably, every two upper and lower adjacent drain pipes 16 interval distance is 1cm to can adjust the water level height in the square measuring cell 3 at any time according to the experiment needs, realize the free expansion rate test of cylindric sample 13 under different water level buries.
The second reservoir 25 communicates with the first reservoir 21 via a return conduit 27, the return conduit 27 being provided with a second water pump 28.
The device for testing the free expansion rate of the compacted bentonite further comprises a temperature adjusting unit, wherein the temperature adjusting unit comprises a temperature sensor 17, an electric heater 18 and a temperature controller 19, the temperature sensor 17 penetrates through the bottom of the outer wall of the square measuring tank 3, the electric heater 18 is located in the base 2, and the temperature sensor 17 and the electric heater 18 are electrically connected with the temperature controller 19.
In order to improve the heating efficiency of the electric heater 18, in the invention, the base 2 is preferably made of stainless steel, and the influence study of different water solution temperatures on the free expansion rate of compacted bentonite is realized through the arrangement of the temperature adjusting unit.
The testing method of the compacted bentonite free expansion rate testing device comprises the following steps:
step one: water level adjustment: the simulated geological water solution in the first container 21 is conveyed into the square measuring tank 3 through the water supply pipe 22 by the top cover 4, a valve positioned on the water discharge pipe 16 with the corresponding height is opened, the redundant simulated geological water solution is led into the second container 25 through the water discharge pipe 16 and the collecting pipe 26 until the water level in the square measuring tank 3 is stabilized at the required height, and the simulated geological water solution in the second container 25 is conveyed back into the first container 21 through the return pipe 27 by the second water pump 28;
step two: and (3) temperature adjustment: when the water level in the square measuring tank 3 reaches the required height, the electric heater 18 is started by the temperature controller 19 to heat the simulated geological water solution in the square measuring tank 3, the temperature controller 19 automatically controls the on-off of the electric heater 18 through the temperature feedback of the temperature sensor 17, when the temperature of the simulated geological water solution does not reach the specified temperature, the electric heater 18 continuously heats, and when the simulated geological water solution reaches the specified temperature, the electric heater is automatically turned off to heat so as to maintain the temperature of the simulated geological water solution constant;
step three: and (3) installing a sample: when the water temperature reaches the specified temperature, the cylindrical sample 13, the porous elastic latex film 12 and the arc-shaped porous measuring plate 5 which are assembled are placed on the permeable stone seat 11, the measuring ends of the four lateral dial indicators 10 are quickly abutted against the end parts of the corresponding measuring rods 9, the lateral dial indicators 10 are fixed and zeroed, the permeable Dan Gai and the top cover 4 are placed, the measuring ends of the top dial indicator 15 are abutted against the top surface of the permeable stone cover 14, and then the top dial indicator 15 is fixed and zeroed;
step four: and (3) data recording: after the sample is installed, the readings of the top dial indicator 15 and the four lateral dial indicators 10 are continuously recorded at fixed time intervals, the data recording is stopped after the readings of each dial indicator are stable, the experiment is stopped, the free expansion rate of the cylindrical sample 13 in the water solution with the specific temperature is calculated through experimental data and a calculation formula, and finally the accurate test of the free expansion rate of the cylindrical sample 13 in the water solution is realized.
The calculation formula is as follows:wherein F is f Free expansion ratio of the cylindrical sample 13;
r 0 diameter of the cylindrical sample 13 in mm;
h 0 height of the cylindrical sample 13 in mm;
r 1 、r 2 、r 3 、r 4 the readings are in mm for four lateral dial indicators 10;
h s the reading of the top dial gauge 15 is expressed in mm;
pi is the circumference ratio.
Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.
Claims (8)
1. The method for testing the free expansion rate of the compacted bentonite is characterized by comprising the following steps of: (1) constructing a compaction bentonite free expansion rate testing device: including expansion ratio test unit (1), expansion ratio test unit (1) includes base (2), the top seal fixedly connected with square measuring cell (3) of base (2), be connected with top cap (4) can be dismantled at the top of square measuring cell (3), each lateral wall of square measuring cell (3) all runs through and is provided with side micrometer (10), the top of base (2) is provided with permeable stone seat (11), permeable stone seat (11) are located the inboard of square measuring cell (3), the top of permeable stone seat (11) is provided with cylindric sample (13), the outside of cylindric sample (13) is circumference and distributes has four arc porous measuring plates (5), arc porous measuring plates (5) and side micrometer (10) one-to-one, the top of cylindric sample (13) is provided with permeable Dan Gai (14), the top of top cap (4) runs through and is provided with top micrometer (15), the measuring end of top micrometer (15) offsets with the top center department of permeating water Dan Gai (14).
(2) The method for testing the free expansion rate of the compacted bentonite comprises the following steps:
step one: water level adjustment: the simulated geological water solution in the first container (21) is conveyed into the square measuring tank (3) through the water supply pipe (22) by the top cover (4), a valve positioned on a water drain pipe (16) with the corresponding height is opened, the redundant simulated geological water solution is led into the second container (25) through the water drain pipe (16) and the collecting pipe (26) until the water level in the square measuring tank (3) is stabilized at the required height, and the simulated geological water solution in the second container (25) is conveyed back into the first container (21) through the return pipe (27) by the second water pump (28);
step two: and (3) temperature adjustment: when the water level in the square measuring tank (3) reaches the required height, an electric heater (18) is started by a temperature controller (19) to heat the simulated geological water solution in the square measuring tank (3), the temperature controller (19) automatically controls the switch of the electric heater (18) through the temperature feedback of a temperature sensor (17), when the temperature of the simulated geological water solution does not reach the specified temperature, the electric heater (18) continuously heats, and when the simulated geological water solution reaches the specified temperature, the electric heater is automatically closed to heat so as to maintain the temperature of the simulated geological water solution constant;
step three: and (3) installing a sample: when the water temperature reaches the specified temperature, placing the assembled cylindrical sample (13), the porous elastic latex film (12) and the arc-shaped porous measuring plate (5) on the permeable stone seat (11), rapidly abutting the measuring ends of the four lateral dial indicators (10) on the end parts of the corresponding measuring rods (9), fixing and zeroing the lateral dial indicators (10), then placing the permeable Dan Gai (14) and the top cover (4), and fixing and zeroing the top dial indicators (15) after the measuring ends of the top dial indicators (15) abut against the top surface of the permeable Dan Gai (14);
step four: and (3) data recording: after the sample is installed, continuously recording the readings of a top dial indicator (15) and four lateral dial indicators (10) at fixed time intervals, stopping data recording after the readings of the dial indicators are stable, stopping experiments, calculating the free expansion rate of the cylindrical sample (13) in the water solution with a specific temperature through experimental data and a calculation formula, and finally, accurately testing the free expansion rate of the cylindrical sample (13) in the water solution;
the calculation formula is as follows:
in the calculation formula:
F f a free expansion ratio of the cylindrical sample (13);
r 0 is the diameter of a cylindrical sample (13) in mm;
h 0 is the height of the cylindrical sample (13) in mm;
r 1 、r 2 、r 3 、r 4 the unit is mm for the reading of four lateral dial indicators (10);
h s a reading of the top dial gauge (15) in mm;
pi is the circumference ratio.
2. The method for testing the free expansion rate of compacted bentonite according to claim 1, wherein the method comprises the following steps: the inner surface and the side of the arc porous measuring plate (5) are provided with water permeable holes (6) which are communicated with each other, the outer surface of the arc porous measuring plate (5) is uniformly and fixedly connected with four stress rods (7), the ends of the stress rods (7) are fixedly connected with I-shaped strips (8) together, the center of the outer wall of each I-shaped strip (8) is fixedly connected with a measuring rod (9), and the ends of the measuring rods (9) are propped against the measuring ends of corresponding lateral dial gauges (10).
3. The method for testing the free expansion rate of compacted bentonite according to claim 2, wherein the method comprises the following steps: the outer wall sleeve of cylindric sample (13) sets up porous elastic latex membrane (12), the surface of porous elastic latex membrane (12) is laminated with the interior surface of arc porous measurement board (5).
4. A compacted bentonite free expansion test method according to claim 3, wherein: the inside diameter of the porous elastic latex film (12) in a natural state is 1-2mm smaller than the outside diameter of the cylindrical sample (13).
5. The method for testing the free expansion rate of compacted bentonite according to claim 1, wherein the method comprises the following steps: still include water supply unit (20), water supply unit (20) include first container (21), first container (21) are through delivery pipe (22) and square measuring cell (3) intercommunication, delivery pipe (22) run through the outer wall of square measuring cell (3), install first water pump (23) on delivery pipe (22).
6. The method for testing the free expansion rate of compacted bentonite according to claim 5, wherein the method comprises the following steps: still include drainage unit (24), drainage unit (24) include second container (25), install collecting pipe (26) on second container (25), the outer wall of square measuring cell (3) runs through and is provided with a plurality of drain pipes (16), a plurality of drain pipe (16) all communicate with collecting pipe (26), all install the valve on drain pipe (16), a plurality of drain pipe (16) are from top to bottom equidistant distribution in the surface of square measuring cell (3).
7. The method for testing the free expansion rate of compacted bentonite according to claim 6, wherein: the second container (25) is communicated with the first container (21) through a return pipe (27), and a second water pump (28) is arranged on the return pipe (27).
8. The method for testing the free expansion rate of compacted bentonite according to claim 1, wherein the method comprises the following steps: the temperature regulation unit comprises a temperature sensor (17), an electric heater (18) and a temperature controller (19), wherein the temperature sensor (17) penetrates through the bottom of the outer wall of the square measuring tank (3), the electric heater (18) is located in the base (2), and the temperature sensor (17) and the electric heater (18) are electrically connected with the temperature controller (19).
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