CN110988299A - Device for testing unsaturated expansive force of high-compaction bentonite assembly - Google Patents
Device for testing unsaturated expansive force of high-compaction bentonite assembly Download PDFInfo
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- CN110988299A CN110988299A CN201911070825.XA CN201911070825A CN110988299A CN 110988299 A CN110988299 A CN 110988299A CN 201911070825 A CN201911070825 A CN 201911070825A CN 110988299 A CN110988299 A CN 110988299A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
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- G01L5/0028—Force sensors associated with force applying means
Abstract
A device for testing unsaturated expansive force of a high-compaction bentonite assembly comprises a constant volume experiment device, a suction control device, an expansive force measuring device and a sample pressing auxiliary device. The constant volume experimental device provides the functions of sample preparation, sample combination, deformation limitation and the like. The suction control device controls the target suction achieved by the sample by adopting a gas phase method. The expansion force measuring device has the functions of measuring and recording the expansion force under the action of the target suction force. The sample pressing auxiliary device provides functions of plugging, checking and the like required in the sample preparation and sample combination process. The invention realizes the automatic test of the unsaturated expansibility of the high-compaction bentonite composition and the exploration of the self-healing condition of the interface of the composition. The method is easy, has more automatic sampling data, is reliable and easy to implement, can provide basic basis for design, construction and safety evaluation of the engineering barrier system of the deep geological disposal repository, and has important engineering significance and practical value.
Description
Technical Field
The invention belongs to the technical field of civil engineering (geotechnical) and geological engineering, and relates to a device for testing unsaturated expansive force of a high-compaction bentonite assembly.
Background
The high-level waste has the characteristics of strong radioactivity and long half-life period, and the deep geological treatment method is known to be an effective and feasible high-level waste treatment means. The method is to seal a high level waste solidified body in a deep stratum and adopt multiple barriers (including engineering barriers and natural barriers) to block the migration of nuclides to the external environment. The buffer backfill material in the engineering barrier has the key functions of maintaining stable structure, retarding groundwater seepage, retarding nuclide migration and the like. Through the comparison and selection research, the compacted bentonite is preferably used as a buffer backfill material in various countries due to the properties of strong expansion, low permeability, strong adsorption and the like.
In the deep geological disposal concept, the engineering barrier is usually formed by splicing high-compaction bentonite blocks. Thus, three types of interfaces will be formed in the engineering barrier: waste tank-compacted bentonite interface, compacted bentonite composite interface, compacted bentonite-surrounding rock interface. The three interfaces play a role in determining the physical and mechanical integrity of the engineering barrier, and finally influence the chemical-hydraulic-mechanical buffer performance of the engineering barrier. After the disposal hole is closed, the compacted bentonite in the engineering barrier continuously absorbs moisture and hydrates from the surrounding environment to generate expansive force. Research shows that the expansion force plays a key role in the stability, biochemical inhibition and the like of the waste tank. In addition, under the action of pressure (expansion force) and humidity (suction force), the high-compaction bentonite composite interface is gradually cemented and healed, and the process plays a positive role in enhancing the hydraulic barrier capability. Therefore, the evolution process of the expansive force of the high-compaction bentonite composition along with the humidity (suction) and the suction condition for generating interface healing need to be researched, and then the hydraulic and mechanical buffer performance of the engineering barrier system is evaluated.
Aiming at the interface problem in the engineering barrier, the existing research mainly aims at developing indoor experiments and researches the expansibility and the saturation permeability of a waste tank-compacted bentonite interface and a compacted bentonite-surrounding rock interface. However, there is no healing effect between these two types of interfaces, and there is a distinction between the change in expansion force caused by the healing of the interface between compacted bentonite. At present, no relevant research has been carried out on the unsaturated swelling capacity of high compacted bentonite compositions.
Disclosure of Invention
The invention aims to provide a device for testing unsaturated expansibility of a high-compaction bentonite assembly, which is used for developing indoor experimental research and providing scientific basis for research work of a deep geological disposal repository. Furthermore, aiming at the buffer backfill materials in the deep geological disposal library, the expansive force evolution and the interface healing condition of the high-compaction bentonite composite under the suction control condition are analyzed, and a basis is provided for researching the hydraulic state evolution of the engineering barrier system.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a device that is used for high compaction bentonite combination unsaturated swelling power to test, includes four parts of constant volume experimental apparatus, suction controlling means, swelling power measuring device, pressure appearance auxiliary device:
the constant volume experimental device provides the functions of sample preparation, sample combination, deformation limitation and the like;
the suction control device controls the target suction achieved by the sample by adopting a gas phase method;
the expansion force measuring device has the functions of measuring and recording the expansion force under the suction force of the target and the like;
the sample pressing auxiliary device provides functions of plugging, checking and the like required in the sample preparation and sample combination process;
the constant volume experimental device is a main body part of the testing device and is used in the whole testing stage; the sample pressing auxiliary device is used in a sample pressing stage and is respectively installed on the left side and the right side of the constant volume experimental device in an embedded mode; the suction control device is used in the experimental stage and is connected to the left side of the constant volume experimental device by adopting a pipeline. The expansion force measuring device is used in an experimental stage and is installed at the top of the constant volume experimental device through screws. The components are installed and used as required.
Further:
1) the constant volume experimental device comprises a base, a lower sample ring, an upper sample ring, a top cover, a stud, a piston, a sealing ring, filter paper, a permeable stone and a sample. The base, the lower sample ring, the upper sample ring, the top cover, the stud and the piston are all made of stainless steel. The lower sample ring, the upper sample ring and the top cover are respectively provided with four through holes and are connected with the base through four studs, wherein the upper sample ring and the lower sample ring are fixed on the base through nuts. The top cover is fixed at the top end of the stud by a nut. The lower sample ring is provided with a group of horizontal through holes which are symmetrical along the axis at the middle position of the height. The base is internally provided with a communicating channel, and the left end and the right end of the channel are respectively provided with a first base pneumatic quick connector and a second base pneumatic quick connector. The piston is internally provided with a communicating channel, and the left end and the right end of the channel are respectively provided with a first piston pneumatic quick-plugging connector and a second piston pneumatic quick-plugging connector. The sample is positioned in the lower sample ring and is formed by tightly splicing an upper part and a lower part. And filter paper and permeable stones are respectively and sequentially placed on the upper part of the upper sample and the lower part of the lower sample. The piston is embedded in the upper sample ring and presses on the upper permeable stone. And annular sealing grooves are respectively arranged between the upper sample ring and the piston, between the upper sample ring and the lower sample ring, and between the lower sample ring and the base, and sealing rings are installed.
2) The suction control device comprises a diaphragm air pump, a saturated saline solution bottle and a steam purification bottle. The diaphragm air pump is connected with a first piston pneumatic quick connector on the piston through a guide pipe, the steam purification bottle is connected with a first base pneumatic quick connector on the base through a guide pipe, and the diaphragm air pump, the saturated salt solution bottle and the steam purification bottle are connected sequentially through guide pipes. The second base pneumatic quick-plug connector on the base is connected with the second piston pneumatic quick-plug connector on the piston by a guide pipe. The saturated salt solution bottle is used for placing saturated salt solution, the diaphragm air pump blows the saturated salt solution, steam with corresponding humidity (suction value) is generated and enters the steam purification bottle, and the steam purification bottle filters liquid entering the pipeline. Steam enters the constant volume experimental device through the first base pneumatic quick-connection plug on the base and then returns to the diaphragm air pump through the second piston pneumatic quick-connection plug on the piston to form a steam circulation path, and finally the suction force of the sample is the same as the suction force controlled by the saturated salt solution.
3) The expansion force measuring device comprises a pressure sensor, a sensor screw and a paperless recorder. The pressure sensor is fixed on the lower part of the top cover and the upper part of the piston by four screws. The probe of the pressure sensor is embedded in the groove at the top end of the piston. The paperless recorder is connected with the pressure sensor through a cable, and expansion force data are automatically recorded and stored.
4) The sample pressing auxiliary device comprises a plunger, a connecting piece and a connecting piece screw. The plunger can be inserted into and block two horizontal through holes on the lower sample ring. The outer end of the plunger piston is connected with the middle of the connecting piece through threads. And two ends of the connecting sheet are horizontally fixed on the lower sample ring by adopting connecting sheet screws.
The invention can press the lower sample and the upper sample in the lower sample ring and the upper sample ring respectively, push the upper sample in the upper sample ring into the lower sample ring, and finish the tight splicing with the lower sample to form the high-compaction bentonite combination.
And a suction control device (comprising a diaphragm air pump, a saturated salt solution bottle and a steam purification bottle) and a gas phase method are adopted for controlling the suction, and the suction control range can reach 3-309 MPa.
Measuring unsaturated expansive force of the high-compaction bentonite composition by adopting a pressure sensor, and displaying and storing expansive force data in real time by using a paperless recorder.
And (3) plugging the horizontal through hole of the lower sample ring by adopting a sample pressing auxiliary device (a plunger, a connecting sheet and a connecting sheet screw), and pressing a lower sample in the lower sample ring.
The invention can carry out the expansion force experiment of single-stage suction control and can also carry out the expansion force experiment of multi-stage suction control.
The method can be used for measuring the unsaturated expansive force of the high-compaction bentonite composition and can also be used for exploring self-healing suction conditions of the interface of the composition.
Due to the adoption of the technical scheme, the beneficial effects obtained by the invention comprise that:
1) the invention realizes the separated pressing and the close splicing of the high-compaction bentonite combination;
2) the invention realizes the automatic test of the unsaturated expansive force of the high-compaction bentonite assembly under the condition of constant volume, single-stage or multi-stage suction control;
3) the invention realizes the non-saturated expansion force evolution under the constant volume and multistage suction force control condition, and determines the suction force condition for generating the healing effect on the high-compaction bentonite composite interface;
4) the testing method is easy, the testing device is low in price, the automation degree is high, and the whole testing method is reliable and easy to implement.
Drawings
FIG. 1 is a schematic structural diagram of a testing apparatus according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view A-A' of the embodiment shown in FIG. 1.
Fig. 3 is a schematic structural diagram of a sample pressing auxiliary device according to an embodiment of the present invention.
Wherein: 1, a base; 2, lower sample ring; 3, a sample ring is arranged; 4, a top cover; 5, a stud; 6, a piston; 7a first sealing ring; 7b a second seal ring; 7c a third seal ring; 8a first filter paper; 8b second filter paper; 9a first permeable stone; 9b a second permeable stone; 10a upper sample, 10b lower sample; 11a first base pneumatic quick connector; 11b a second base pneumatic quick connector; 12a first piston pneumatic quick connector; 12b a second piston pneumatic quick connector; 13 diaphragm air pump; 14 saturated saline solution bottle; 15 air purifying bottle; 16 a pressure sensor; 17 a sensor screw; 18 paperless recorder; 19 a stud; 20 connecting sheets; 21 connecting the piece screw.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1 to 3, the present invention provides a device for testing unsaturated expansion force of high-compaction bentonite assembly, which comprises four parts of a constant volume experiment device, a suction control device, an expansion force measuring device, and a sample pressing auxiliary device:
1) the constant volume experimental device comprises a base 1, a lower sample ring 2, an upper sample ring 3, a top cover 4, a stud 5, a piston 6, a first sealing ring 7a, a second sealing ring 7b, a third sealing ring 7c, first filter paper 8a, second filter paper 8b, a first permeable stone 9a, a second permeable stone 9b, an upper sample 10a and a lower sample 10 b.
The lower sample ring 2, the upper sample ring 3 and the top cover 4 are respectively provided with four through holes and are connected with the base 1 through four studs 5, wherein the lower sample ring 2 and the upper sample ring 3 are fixed on the base 1 through nuts. The top cover 4 is fixed at the top end of the stud 5 by adopting a nut. The lower sample ring 2 is provided with a set of horizontal through holes at the middle position of the height, which are symmetrical along the axis. The base 1 is internally provided with a communicating channel, and the left end and the right end of the channel are respectively provided with a first base pneumatic quick-plugging connector 11a and a second base pneumatic quick-plugging connector 11 b. The piston 6 is internally provided with a communicating channel, and the left end and the right end of the channel are respectively provided with a first piston pneumatic quick-plugging connector 12a and a second piston pneumatic quick-plugging connector 12 b. The sample is positioned in the lower sample ring 2 and is formed by tightly splicing an upper sample 10a and a lower sample 10 b. A first filter paper 8a and a second filter paper 8b, and a first porous stone 9a and a second porous stone 9b are placed on the upper portion of the upper sample 10a and the lower portion of the lower sample 10b, respectively, in this order. The piston 6 is embedded inside the upper sample ring 3 and presses on the first permeable stone 9 a. Annular seal grooves are respectively arranged between the upper sample ring 3 and the piston 6, between the upper sample ring 3 and the lower sample ring 2, and between the lower sample ring 2 and the base 1, and a first seal ring 7a, a second seal ring 7b and a third seal ring 7c are arranged.
2) The suction control device comprises a diaphragm air pump 13, a saturated saline solution bottle 14 and a steam purifying bottle 15. The diaphragm air pump 13 is connected with a first piston pneumatic quick-plug connector 12a on the piston 6 through a guide pipe, the steam purification bottle 15 is connected with a first base pneumatic quick-plug connector 11a on the base 1 through a guide pipe, and the diaphragm air pump 13, the saturated salt solution bottle 14 and the steam purification bottle 15 are sequentially connected through guide pipes. The second base pneumatic quick-plug connector 11b on the base 1 is connected with the second piston pneumatic quick-plug connector 12b on the piston 6 by a conduit. The saturated saline solution bottle 14 is used for containing saturated saline solution, the diaphragm air pump 13 blows the saturated saline solution, steam with corresponding humidity (suction value) is generated and enters the steam purification bottle 15, and the steam purification bottle 15 filters liquid which possibly enters a pipeline. Steam enters the constant volume experimental device through a first base pneumatic quick-connection plug 11a on the base 1 and then returns to the diaphragm air pump 13 through a second piston pneumatic quick-connection plug 12a on the piston 6 to form a steam circulation path, and finally the suction force of the sample is the same as the suction force controlled by the saturated salt solution.
3) The expansion force measuring device comprises a pressure sensor 16, a sensor screw 17 and a paperless recorder 18. The pressure sensor 16 is fixed to the lower part of the top cover 4 and the upper part of the piston 6 by four sensor screws 17. The probe of the pressure sensor 16 is embedded in a groove at the top end of the piston 6. The paperless recorder 18 is connected with the pressure sensor 16 through a cable, and automatically records and stores the expansion force data.
4) The sample pressing auxiliary device comprises a plunger 19, a connecting piece 20 and a connecting piece screw 21. The plunger 19 can be inserted into and block two horizontal through holes on the lower sample ring 2. The outer end of the plunger 19 is threadedly connected to the middle of the connecting piece 20. The connecting piece 20 is horizontally fixed at both ends to the lower sample ring 2 by connecting piece screws 21.
The working mode of the device for testing the unsaturated expansive force of the high-compaction bentonite assembly is as follows:
1) preparation of lower part sample: the lower sample size was 50mm in diameter, 10mm in height and 1.7g/cm in dry density3. And calculating the mass of the required bentonite powder according to the dry density and the water content of the bentonite powder. First, the test apparatus was disassembled, and the sample pressing and sample combining were performed using only the lower sample ring and the upper sample ring. And (3) plugging horizontal through holes at two sides of the lower sample ring by adopting a sample pressing auxiliary device (a plunger, a connecting sheet and a connecting sheet screw), and adjusting and fixing the position of the plunger. Then, combining the lower sample ring and the upper sample ring, pouring bentonite powder into the lower sample ring, putting the bentonite powder into a pressure rod, and pressing the pressure rod to a preset position at a loading rate of 0.5mm/min by adopting an electronic universal tester; after standing for one hour, the pressure was released at a rate of 20kN/min, and the sample pressing bar was taken out to clean the surface of the lower sample.
2) Top sample preparation: the upper sample size was 50mm in diameter, 10mm in height and 1.7g/cm in dry density3. After the lower sample is pressed, the upper sample ring is separated from the lower sample ring. The upper sample is pressed within the upper sample ring. And weighing bentonite powder with the same mass as that of the lower sample, pouring the bentonite powder into the upper sample ring, putting the pressure rod into the upper sample ring, pressing the upper sample at the same loading rate, standing time and unloading rate, and cleaning the surface of the upper sample.
3) Upper and lower sample combinations: a lower sample ring containing a lower sample and an upper sample ring containing an upper sample are combined, and sample pressing auxiliary devices on both sides of the lower sample ring are removed. The upper sample was placed in a compression bar and combined with the lower sample by pushing the upper sample downward at a rate of 0.2mm/min using an electronic universal tester. During the downward push sample assembly, the stable push sample resistance was recorded and the interface was checked for venting through the horizontal through hole on the lower sample ring. And when the interface is in contact with the lower sample ring and bears pressure of about 0.2MPa and the interface is no longer breathable, the upper sample is considered to be pushed into the lower sample ring and spliced with the lower sample to form a combined body.
4) Assembly unsaturated expansion force test: after completion of sample assembly, the parts were connected in accordance with the structure shown in FIG. 1, and an initial pressure of 0.2MPa was applied. And starting the diaphragm air pump, and gradually adopting different saturated salt solutions to control the suction force under the moisture absorption path step by step. After the expansion force under each stage of suction force is stabilized, the next stage of suction force control can be carried out. In addition, single-stage suction can be performed to complete low-suction control. And after the multi-stage suction control is finished, judging the suction value of the combined body interface which starts to generate healing according to the evolution of the expansive force.
In conclusion, the method is easy, has more automatic sampling data, is reliable and easy to implement, can provide basic basis for design, construction and safety evaluation of the engineering barrier system of the deep geological disposal repository, and has important engineering significance and practical value.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Those skilled in the art may make appropriate adjustments to these embodiments and apply the general principles described herein to other embodiments without the use of inventive faculty. Accordingly, the present invention is not limited to the embodiments described herein. Those skilled in the art should, in light of the present disclosure, appreciate that many changes and modifications can be made without departing from the scope of the invention.
Claims (10)
1. A device that is used for high compaction bentonite composite unsaturated swelling power to test which characterized in that:
the device comprises a constant volume experiment device, a suction control device, an expansion force measuring device and a sample pressing auxiliary device;
the constant volume experimental device provides sample preparation, sample combination and deformation limiting functions;
the suction control device controls the target suction achieved by the sample by adopting a gas phase method;
the expansion force measuring device has the functions of measuring and recording the expansion force under the suction force of the target and the like;
the sample pressing auxiliary device provides functions of plugging, checking and the like required in the sample preparation and sample combination process;
the sample pressing auxiliary devices are respectively installed at the left side and the right side of the constant volume experimental device in an embedded mode; the suction control device is connected to the left side of the constant volume experiment device by adopting a pipeline; the expansion force measuring device is arranged at the top of the constant volume experiment device by adopting a movable connecting structure.
2. The apparatus for the unsaturated expansive force test of high compacted bentonite composition according to claim 1, wherein:
the constant volume experimental device comprises a base (1), a lower sample ring (2), an upper sample ring (3), a top cover (4), a stud (5), a piston (6), a first sealing ring (7a), a second sealing ring (7b), a third sealing ring (7c), first filter paper (8a), second filter paper (8b), a first permeable stone (9a), a second permeable stone (9b), an upper sample (10a) and a lower sample (10 b);
the lower sample ring (2), the upper sample ring (3) and the top cover (4) are respectively provided with four through holes and are connected with the base (1) by four studs (5), wherein the lower sample ring (2) and the upper sample ring (3) are fixed on the base (1) by nuts; the top cover (4) is fixed at the top end of the stud (5) by adopting a nut; a group of horizontal through holes which are symmetrical along the axis are arranged in the middle position of the height of the lower sample ring (2); a communicating channel is arranged in the base (1), and a first base pneumatic quick-plugging connector (11a) and a second base pneumatic quick-plugging connector (11b) are respectively arranged at two ends of the channel; a communicating channel is arranged in the piston (6), and a first piston pneumatic quick-plugging connector (12a) and a second piston pneumatic quick-plugging connector (12b) are respectively arranged at the two ends of the channel; the sample is positioned in the lower sample ring (2) and is formed by tightly splicing an upper sample (10a) and a lower sample (10 b); a first filter paper (8a), a second filter paper (8b), a first permeable stone (9a) and a second permeable stone (9b) are respectively placed on the upper part of the upper sample (10a) and the lower part of the lower sample (10b) in sequence; the piston (6) is embedded in the upper sample ring (3) and is pressed on the first permeable stone (9 a); annular sealing grooves are respectively arranged between the upper sample ring (3) and the piston (6), between the upper sample ring (3) and the lower sample ring (2) and between the lower sample ring (2) and the base (1), and a first sealing ring (7a), a second sealing ring (7b) and a third sealing ring (7c) are installed.
3. The apparatus for the unsaturated expansive force test of high compacted bentonite composition according to claim 1, wherein:
the suction control device comprises a diaphragm air pump (13), a saturated saline solution bottle (14) and a steam purification bottle (15); the diaphragm air pump (13) is connected with a first piston pneumatic quick-plugging connector (12a) on the piston (6) through a guide pipe, the steam purification bottle (15) is connected with a first base pneumatic quick-plugging connector (11a) on the base (1) through a guide pipe, and the diaphragm air pump (13), the saturated salt solution bottle (14) and the steam purification bottle (15) are sequentially connected through guide pipes; a second base pneumatic quick-plug connector (11b) on the base (1) is connected with a second piston pneumatic quick-plug connector (12b) on the piston (6) by a guide pipe; the saturated salt solution bottle (14) is used for containing saturated salt solution, the diaphragm air pump (13) blows the saturated salt solution, steam with a corresponding humidity/suction value is generated and enters the steam purification bottle (15), and the steam purification bottle (15) filters liquid which possibly enters a pipeline; steam enters the constant volume experimental device through a first base pneumatic quick connector (11a) on the base (1) and then returns to the diaphragm air pump (13) through a second piston pneumatic quick connector (12a) on the piston (6) to form a steam circulation path, and finally the suction force of the sample is the same as the suction force controlled by the saturated salt solution.
4. The apparatus for the unsaturated expansive force test of high compacted bentonite composition according to claim 1, wherein:
the expansion force measuring device comprises a pressure sensor (16), a sensor screw (17) and a paperless recorder (18); the pressure sensor (16) is fixed on the lower part of the top cover (4) and the upper part of the piston (6) by four sensor screws (17); a probe of the pressure sensor (16) is embedded into a groove at the top end of the piston (6); the paperless recorder (18) is connected with the pressure sensor (16) through a cable, and expansion force data are automatically recorded and stored.
5. The apparatus for the unsaturated expansive force test of high compacted bentonite composition according to claim 1, wherein:
the sample pressing auxiliary device comprises a plunger (19), a connecting piece (20) and a connecting piece screw (21); the plunger (19) can be inserted into and block two horizontal through holes on the lower sample ring (2); the outer end of the plunger (19) is connected with the middle of the connecting piece (20) through threads; two ends of the connecting piece (20) are horizontally fixed on the lower sample ring (2) by connecting piece screws (21).
6. The apparatus for the unsaturated expansive force test of high compacted bentonite composition according to claim 2, wherein: the lower sample (10b) and the upper sample (10a) can be respectively pressed in the lower sample ring (2) and the upper sample ring (3), the upper sample (10a) in the upper sample ring (3) is pushed into the lower sample ring (2), and the lower sample (10b) is tightly spliced to form the high-compaction bentonite combination.
7. The apparatus for the unsaturated expansive force test of high compacted bentonite composition according to claim 1, wherein: and (3) performing suction control by adopting the suction control device and a gas phase method, wherein the suction control range is 3-309 MPa.
8. The apparatus for the unsaturated expansive force test of high compacted bentonite composition according to claim 1, wherein: measuring unsaturated expansive force of the high-compaction bentonite composition by adopting a pressure sensor, and displaying and storing expansive force data in real time by using a paperless recorder.
9. The apparatus for the unsaturated expansive force test of high compacted bentonite composition according to claim 2, wherein: the horizontal through hole of the lower sample ring (2) is closed by a sample pressing auxiliary device, and the lower sample (10b) is pressed in the lower sample ring (2).
10. The apparatus for the unsaturated expansive force test of high compacted bentonite composition according to claim 1, wherein: the expansion force experiment of single-stage suction control can be carried out, and the expansion force experiment of multi-stage suction control can also be carried out; or the method can be used for measuring the unsaturated expansion force of the high-compaction bentonite composition and can also be used for exploring self-healing suction conditions of the interface of the composition.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111504793A (en) * | 2020-04-23 | 2020-08-07 | 中南大学 | Device and method for measuring saturated and unsaturated strength of polluted soil body |
| CN113945603A (en) * | 2021-10-21 | 2022-01-18 | 中南大学 | Test device and method capable of measuring thermal conductivity coefficient of expansive soil body in hydration process |
| CN114353736A (en) * | 2022-01-05 | 2022-04-15 | 中国人民解放军63653部队 | Method for testing free expansion rate of compacted bentonite |
-
2019
- 2019-11-05 CN CN201911070825.XA patent/CN110988299A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111504793A (en) * | 2020-04-23 | 2020-08-07 | 中南大学 | Device and method for measuring saturated and unsaturated strength of polluted soil body |
| CN111504793B (en) * | 2020-04-23 | 2021-06-15 | 中南大学 | Device and method for measuring saturated and unsaturated strength of polluted soil body |
| CN113945603A (en) * | 2021-10-21 | 2022-01-18 | 中南大学 | Test device and method capable of measuring thermal conductivity coefficient of expansive soil body in hydration process |
| CN114353736A (en) * | 2022-01-05 | 2022-04-15 | 中国人民解放军63653部队 | Method for testing free expansion rate of compacted bentonite |
| CN114353736B (en) * | 2022-01-05 | 2023-08-18 | 中国人民解放军63653部队 | Method for testing free expansion rate of compacted bentonite |
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