CN114353736A - 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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- CN114353736A CN114353736A CN202210010836.4A CN202210010836A CN114353736A CN 114353736 A CN114353736 A CN 114353736A CN 202210010836 A CN202210010836 A CN 202210010836A CN 114353736 A CN114353736 A CN 114353736A
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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 cell in a sealing way, the top of the square measuring cell is detachably connected with a top cover, each side wall of the square measuring cell 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 porous stone seat, the porous stone cover, the top dial indicator and the four lateral dial indicators are matched, the free expansion of the compacted bentonite can be measured from multiple directions, and by utilizing the mutual matching of the four porous measuring plates, after the compacted bentonite column is wrapped by the four arc-shaped porous measuring plates, four cracks can be formed on the side wall, and the four cracks can simulate the scene that groundwater enters the backfilled compacted bentonite from geological cracks under a real environment, so that the free expansion rate of the compacted bentonite closer to the original position under the action of geological water can be 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 disposal process of nuclear waste, in order to prevent radioactive waste from entering a natural environment, a container disposal structure generally adopts a multilayer barrier system, and comprises an artificial barrier consisting of concrete, a packaging container and a buffer material and a natural barrier consisting of surrounding rocks, wherein the buffer backfill material is the last artificial barrier for the radioactive waste to enter the natural environment. Bentonite is considered the best buffer backfill material due to its strong adsorption, low permeability and good self-healing ability. The compacted bentonite in the backfill structure can generate cracks under long-term natural acting force (such as earthquake, erosion and the like), and the expansion self-healing capacity of the cracks after encountering geological pore water is a key index for evaluating the long-term safety of a disposal reservoir. Therefore, the laboratory researches on the free expansion rate of the compacted bentonite in different water chemical environments are of great significance.
The existing expansion rate testers in the market are all directed at rock or soil samples, can only test the expansion rate in a single direction, and are not suitable for testing the free expansion rate of the compacted bentonite in a water environment. The problem to be solved by the invention is how to accurately test the free expansion rate of the compacted bentonite in the water environment.
Disclosure of Invention
The invention aims to provide a method for testing the free expansion rate of compacted bentonite, which solves the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
constructing a testing device for the free expansion rate of the compacted bentonite: the device for testing the free expansion rate of the compacted bentonite 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 cell in a sealing way, the top of the square measuring cell 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, the top of the base is provided with a permeable stone seat, the permeable stone seat is positioned at the inner side of the square measuring tank, the top of the permeable stone seat is provided with a cylindrical sample, four arc-shaped porous measuring plates are circumferentially distributed on the outer side of the cylindrical sample, the arc-shaped porous measuring plates correspond to the lateral dial indicators one by one, a permeable stone cover is arranged at the top of the cylindrical sample, a top dial indicator penetrates through the top of the top cover, and the measuring end of the top dial indicator abuts against the center of the top of the permeable stone cover;
② the testing method of the free expansion rate of the compacted bentonite comprises the following steps:
the method comprises the following steps: water level adjustment: conveying the simulated geological aqueous solution in the first container into a square measuring tank through a water supply pipe through a top cover, opening a valve on a drain pipe at a corresponding height, guiding redundant simulated geological aqueous solution into a second container through the drain pipe and a collecting pipe until the water level in the square measuring tank is stabilized at a required height, and conveying the simulated geological aqueous solution in the second container back into the first container through a return pipe through a second water pump;
step two: temperature regulation: when the water level in the square measuring pool reaches the required height, the electric heater is started through the temperature controller to heat the simulated geological water solution in the square measuring pool, the temperature controller automatically controls the switch of the electric heater through the temperature feedback of the 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 temperature of the simulated geological water solution reaches the specified temperature, the electric heater automatically turns off to heat so as to maintain the temperature of the simulated geological water solution to be constant;
step three: installing a sample: when the water temperature reaches a specified temperature, placing the assembled cylindrical sample, the porous elastic latex film and the arc-shaped porous measuring plate on a 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 a permeable stone cover and a top cover, and abutting the measuring ends of the top dial indicator against the top surface of the permeable stone cover, and fixing and zeroing the top dial indicator;
step four: and (3) data recording: after the installation of the sample is finished, 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 the dial indicators are stable, stopping the experiment, calculating the free expansion rate of the cylindrical sample in the aqueous solution at a specific temperature through experimental data and a calculation formula, and finally realizing the accurate test of the free expansion rate of the cylindrical sample in the aqueous solution;
the calculation formula is as follows:
in the calculation formula:
Ffthe free expansion rate of the cylindrical sample (13);
r0is the diameter of the cylindrical sample (13) in mm;
h0is the height of the cylindrical sample (13) in mm;
r1、r2、r3、r4the readings of four lateral dial indicators (10) are shown in mm;
hsindicating the reading of the top dial gauge (15) in mm;
and pi is the circumferential ratio.
As a further scheme of the invention: the inner surface and the side of the arc-shaped porous measuring plate are provided with water permeable holes which are communicated with each other, four stress rods and four I-shaped bars are fixedly connected to the outer surface of the arc-shaped porous measuring plate uniformly, the outer wall center of each I-shaped bar is fixedly connected with a measuring rod, and the end of each measuring rod is abutted to the measuring end of the corresponding lateral dial indicator.
As a further scheme of the invention: the outer wall sleeve of the cylindrical sample is provided with a porous elastic latex film, and the outer surface of the porous elastic latex film is attached to the inner surface of the arc-shaped porous measuring plate.
As a further scheme of the invention: above-mentioned compaction bentonite free expansion rate testing arrangement still includes the water supply unit, the 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 the drainage unit, the 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, and is a plurality of the drain pipe is from top to bottom equidistance distribution on the surface of square measuring cell.
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 installed on the return pipe.
As a further scheme of the invention: 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, an electric heater and a temperature controller, the temperature sensor penetrates through the bottom of the outer wall of the square measuring cell, the electric heater is located in the base, and the temperature sensor and the electric heater are electrically connected with the temperature controller.
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 porous stone seat, the porous stone cover, the top dial indicator and the four lateral dial indicators are matched, the free expansion of the compacted bentonite can be measured from multiple directions, and by utilizing the mutual matching of the four porous measuring plates, after the compacted bentonite column is wrapped by the four arc-shaped porous measuring plates, four cracks can be formed on the side wall, and the four cracks can simulate the scene that groundwater enters the backfilled compacted bentonite from geological cracks under a real environment, so that the free expansion rate of the compacted bentonite closer to the original position under the action of 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 to be contacted with water for a long time and not to collapse after being fully expanded.
3. According to the invention, the water level height in the square measuring tank can be adjusted at any time according to experiment requirements by arranging the plurality of drainage 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 research on the influence of different water solution temperatures on the free expansion rate of the 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 test unit in the compacted bentonite free expansion rate test device.
FIG. 3 is a schematic diagram of the installation position of a porous elastic latex film in a compacted bentonite free expansion rate testing device.
FIG. 4A is a schematic view of a first viewing direction of a curved porous measuring plate in a compacted bentonite free expansion rate testing device;
fig. 4B is a schematic view of a second viewing direction three-dimensional structure of an arc-shaped porous measuring plate in the compacted bentonite free expansion rate testing device.
Wherein, expansion rate test unit 1, base 2, square measuring cell 3, top cap 4, the porous measuring plate of arc 5, the hole of permeating water 6, atress pole 7, I-shaped strip 8, measuring stick 9, side direction amesdial 10, the porous stone seat 11, porous elastic latex membrane 12, cylindric sample 13, the porous stone lid 14, top amesdial 15, drain pipe 16, temperature sensor 17, electric heater 18, temperature controller 19, water supply unit 20, first container 21, delivery pipe 22, first water pump 23, drainage unit 24, second container 25, collecting pipe 26, back flow 27, second water pump 28.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 4, in the embodiment of the present invention, the device for testing the free expansion rate of compacted bentonite includes an expansion rate testing unit 1, the expansion rate testing unit 1 includes a base 2, a square measuring cell 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 cell 3, lateral dial indicators 10 are respectively arranged on each side wall of the square measuring cell 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 located on the inner side of the square measuring cell 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 correspond to the cylindrical dial indicators 10 one by one, a permeable stone cover 14 is arranged on the top of the sample 13, a top dial indicator 15 is arranged on the top of the top cover 4 in a penetrating manner, the measuring end of the top dial indicator 15 is propped against the top center of the permeable stone cover 14
In the scheme, the permeable stone seat 11 and the permeable stone cover 14 are arranged, so that the completeness of the top and the bottom of a cylindrical sample 13 after the sample is expanded is ensured while the top and the bottom of the sample are in full contact with water for expansion; the square measuring tank 3 is made of transparent organic glass, whether the experimental process is normal or not and whether the cylindrical sample 13 is complete or not in the experimental process can be observed in real time, so that the effectiveness of the experiment and the accuracy of the measuring result are ensured.
Specifically, with reference to fig. 4 (fig. 4A and 4B), the arc-shaped porous measuring plate 5 is made of a light anticorrosive organic material and has the characteristics of acid and alkali corrosion resistance, high temperature resistance, high hardness, and non-deformation, and the inner surface and the side surface of the arc-shaped porous measuring plate 5 are both provided with water permeable holes 6 which are communicated with each other, so that the cylindrical sample 13 is prevented from being rapidly contacted with water after being placed in a solution, after the compacted bentonite column is wrapped by the four arc-shaped porous measuring plates 5, four cracks are formed on the side wall, and the four cracks can simulate the scene that groundwater in a real environment invades compacted backfilled bentonite from geological cracks, so as to obtain the free expansion rate of the compacted bentonite closer to the original position under the action of geological water, the outer surface of the arc-shaped porous measuring plate 5 is uniformly and fixedly connected with four stress rods 7, and the end portions of the four stress rods 7 are jointly and fixedly connected with i-shaped bars 8, the center of the outer wall of the I-shaped bar 8 is fixedly connected with a measuring rod 9, and the end part of the measuring rod 9 abuts against the measuring end of the corresponding lateral dial indicator 10.
The use of the arc-shaped porous measuring plate 5 has the following three purposes, namely, the porous design ensures that the periphery of a cylindrical sample 13 prepared by compacting bentonite is fully contacted with an aqueous solution to generate expansion; secondly, the four arc-shaped porous measuring plates 5 can completely wrap the side surface of the cylindrical sample 13, and the design of the hard arc shape ensures the integrity of the side surface of the cylindrical sample 13 after being eroded and expanded by water; and thirdly, each arc-shaped porous measuring plate 5 is contacted with four stress rods 7 to form stress points, the total number of the stress points is sixteen, lateral expansion deformation induced by the sixteen stress points is averagely transmitted to the corresponding lateral dial indicator 10, and the accuracy of lateral expansion rate measurement is ensured.
The outer wall sleeve of the cylindrical sample 13 is provided with a porous elastic latex film 12, and the outer surface of the porous elastic latex film 12 is attached to the inner surface of the arc-shaped porous measuring plate 5.
The porous elastic latex film 12 can generate large elastic deformation, countless small holes are distributed on the upper edge of the porous elastic latex film, and the porous elastic latex film 12 is wrapped on the cylindrical sample 13, so that the cylindrical sample 13 is ensured not to collapse after being contacted with water for a long time and fully expanded.
The natural state inner diameter of the porous elastic latex film 12 is 1-2mm smaller than the outer diameter of the cylindrical sample 13.
By adopting the above device, the elasticity of the porous elastic latex film 12 can be utilized to tightly coat the circumferential outer wall of the cylindrical sample 13.
The testing device for 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 installed 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, and is a plurality of drain pipe 16 all communicates with collecting pipe 26, all install the valve on the drain pipe 16, and is a plurality of drain pipe 16 distributes at square measuring cell 3's surface equidistance from top to bottom, and is preferred, and every two interval distance that are adjacent drain pipe 16 from top to bottom is 1cm to can adjust the water level height in the square measuring cell 3 at any time according to the experiment needs, realized the free expansion rate test of cylindric sample 13 under different water level burial depths.
The second reservoir 25 communicates with the first reservoir 21 via a return pipe 27, and a second water pump 28 is mounted on the return pipe 27.
The testing device for 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 cell 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 of different water solution temperatures on the free expansion rate of the compacted bentonite is researched by arranging the temperature adjusting unit.
The testing method of the testing device for the free expansion rate of the compacted bentonite comprises the following steps:
the method comprises the following steps: 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 on the water discharge pipe 16 at the corresponding height is opened, the redundant simulated geological water solution is guided 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: temperature regulation: when the water level in the square measuring pool 3 reaches the required height, the electric heater 18 is started through the temperature controller 19 to heat the simulated geological water solution in the square measuring pool 3, the temperature controller 19 automatically controls the switch 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 temperature of 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 to be constant;
step three: installing a sample: after the water temperature reaches the designated temperature, the assembled cylindrical sample 13, the porous elastic latex film 12 and the arc-shaped porous measuring plate 5 are placed on the permeable stone seat 11, the measuring ends of the four lateral dial indicators 10 are rapidly abutted against the end parts of the corresponding measuring rods 9, the lateral dial indicators 10 are fixed and zeroed, then the permeable stone cover 14 and the top cover 4 are placed, and the top dial indicator 15 is fixed and zeroed after the measuring end of the top dial indicator 15 is abutted against the top surface of the permeable stone cover 14;
step four: and (3) data recording: after the installation of the sample is completed, continuously recording the readings of the top dial indicator 15 and the four lateral dial indicators 10 according to a fixed time interval, stopping data recording after the readings of the dial indicators are stable, stopping the experiment, calculating the free expansion rate of the cylindrical sample 13 in the aqueous solution at a specific temperature through experimental data and a calculation formula, and finally realizing the accurate test of the free expansion rate of the cylindrical sample 13 in the aqueous solution.
The calculation formula is as follows:
in the formula, FfThe free expansion ratio of the cylindrical sample 13;
r0is the diameter of the cylindrical sample 13 in mm;
h0is the height of the cylindrical sample 13 in mm;
r1、r2、r3、r4the readings of the four lateral dial indicators 10 are shown in mm;
hsindicating the reading of the top dial gauge 15 in mm;
and pi is the circumferential ratio.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (8)
1. The method for testing the free expansion rate of the compacted bentonite is characterized by comprising the following steps: constructing a testing device for the free expansion rate of the compacted bentonite: the device comprises an expansion rate testing unit (1), wherein the expansion rate testing unit (1) comprises a base (2), the top of the base (2) is fixedly connected with a square measuring pool (3) in a sealing manner, the top of the square measuring pool (3) is detachably connected with a top cover (4), each side wall of the square measuring pool (3) is provided with a lateral dial indicator (10) in a penetrating manner, the top of the base (2) is provided with a permeable stone seat (11), the permeable stone seat (11) is positioned at the inner side of the square measuring pool (3), the top of the permeable stone seat (11) is provided with a cylindrical sample (13), 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) correspond to the lateral dial indicators (10) one by one, and the top of the cylindrical sample (13) is provided with a permeable stone cover (14), a top dial indicator (15) penetrates through the top of the top cover (4), and the measuring end of the top dial indicator (15) is abutted against the center of the top of the permeable stone cover (14);
② the testing method of the free expansion rate of the compacted bentonite comprises the following steps:
the method comprises the following steps: water level adjustment: the simulated geological water solution in the first container (21) is conveyed into the square measuring pool (3) through the top cover (4) through the water supply pipe (22), a valve on the water discharge pipe (16) at the corresponding height is opened, the redundant simulated geological water solution is guided into the second container (25) through the water discharge pipe (16) and the collecting pipe (26) until the water level in the square measuring pool (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) through the second water pump (28);
step two: temperature regulation: when the water level in the square measuring pool (3) reaches the required height, the electric heater (18) is started through the temperature controller (19) to heat the simulated geological water solution in the square measuring pool (3), the temperature controller (19) automatically controls the switch 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 designated temperature, the electric heater (18) continuously heats, and when the temperature of the simulated geological water solution reaches the designated temperature, the electric heater automatically turns off to heat so as to maintain the temperature of the simulated geological water solution to be constant;
step three: installing a sample: after the water temperature reaches a specified temperature, placing a cylindrical sample (13), a porous elastic latex film (12) and an arc-shaped porous measuring plate (5) which are assembled on a permeable stone seat (11), rapidly abutting the measuring ends of four lateral dial indicators (10) against the end parts of corresponding measuring rods (9), fixing and zeroing the lateral dial indicators (10), then placing a permeable stone cover (14) and a top cover (4), abutting the measuring end of a top dial indicator (15) against the top surface of the permeable stone cover (14), and fixing and zeroing the top dial indicator (15);
step four: and (3) data recording: after the installation of the sample is finished, continuously recording the readings of the top dial indicator (15) and the four lateral dial indicators (10) at fixed time intervals, stopping data recording after the readings of the dial indicators are stable, stopping the experiment, calculating the free expansion rate of the cylindrical sample (13) in the aqueous solution at a specific temperature through experimental data and a calculation formula, and finally realizing the accurate test of the free expansion rate of the cylindrical sample (13) in the aqueous solution;
the calculation formula is as follows:
in the calculation formula:
Ffthe free expansion rate of the cylindrical sample (13);
r0is the diameter of the cylindrical sample (13) in mm;
h0is the height of the cylindrical sample (13) in mm;
r1、r2、r3、r4the readings of four lateral dial indicators (10) are shown in mm;
hsindicating the reading of the top dial gauge (15) in mm;
and pi is the circumferential ratio.
2. The compacted bentonite free expansion rate test method as set forth in claim 1, wherein: the internal surface and the side of the arc-shaped porous measuring plate (5) are provided with water permeable holes (6) which are communicated with each other, four stress rods (7) and four stress rods (7) are fixedly connected to the outer surface of the arc-shaped porous measuring plate (5) uniformly, the end parts of the stress rods (7) are fixedly connected with I-shaped bars (8) together, the outer wall center of each I-shaped bar (8) is fixedly connected with a measuring rod (9), and the end parts of the measuring rods (9) are abutted to the measuring ends of corresponding lateral dial indicators (10).
3. The compacted bentonite free expansion rate test method as set forth in claim 2, wherein: the outer wall cover of cylindric sample (13) sets up porous elastic latex membrane (12), the surface of porous elastic latex membrane (12) and the interior surface laminating of arc porous measurement board (5).
4. The compacted bentonite free expansion rate test method as set forth in claim 3, wherein: the natural state inner diameter of the porous elastic latex film (12) is 1-2mm smaller than the outer diameter of the cylindrical sample (13).
5. The compacted bentonite free expansion rate test method as set forth in claim 1, wherein: 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 in square measuring cell (3), install first water pump (23) on delivery pipe (22).
6. The compacted bentonite free expansion rate test method as set forth in claim 5, wherein: 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), and is a plurality of drain pipe (16) all communicate with collecting pipe (26), all install the valve on drain pipe (16), and is a plurality of drain pipe (16) are from top to bottom equidistance distribution on the surface of square measuring cell (3).
7. The compacted bentonite free expansion rate test method as set forth in 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 installed on the return pipe (27).
8. The compacted bentonite free expansion rate test method as set forth in claim 1, wherein: still include the temperature regulation unit, the temperature regulation unit includes temperature sensor (17), electric heater (18), temperature controller (19), temperature sensor (17) run through the outer wall bottom of square measuring cell (3), electric heater (18) are located base (2), temperature sensor (17), electric heater (18) all are connected with temperature controller (19) electricity.
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| 鲁文?;刘月妙;谢敬礼;高玉峰;佟强;: "高庙子钠基膨润土的膨胀性能研究", 中国矿业, no. 03 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115015519A (en) * | 2022-05-06 | 2022-09-06 | 中原工学院 | Geotechnical soil test device |
| CN115015519B (en) * | 2022-05-06 | 2023-11-07 | 中原工学院 | Geotechnical engineering test device |
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| CN114353736B (en) | 2023-08-18 |
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