CN117074194B - Three-dimensional stress controllable closed environment load-holding freeze-thawing soil sample air pressure loading system - Google Patents
Three-dimensional stress controllable closed environment load-holding freeze-thawing soil sample air pressure loading system Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 131
- 238000010257 thawing Methods 0.000 title claims abstract description 46
- 230000007246 mechanism Effects 0.000 claims abstract description 8
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 238000005192 partition Methods 0.000 claims description 8
- 238000012360 testing method Methods 0.000 abstract description 17
- 230000002457 bidirectional effect Effects 0.000 abstract description 5
- 239000003570 air Substances 0.000 description 93
- 230000008014 freezing Effects 0.000 description 6
- 238000007710 freezing Methods 0.000 description 6
- 210000003437 trachea Anatomy 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0224—Thermal cycling
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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Abstract
The invention discloses a three-dimensional stress controllable closed environment load-holding freeze-thawing soil sample air pressure loading system, which comprises: a backing plate; the pressure chamber is fixed at the top end of the base plate and is coaxially arranged with the base plate, and a soil sample is fixed at the central position in the pressure chamber through a fixing mechanism; a first confining pressure system; a second confining pressure system; an axle pressure system; the air supply system is used for supplying air to the first confining pressure system, the second confining pressure system and the shaft pressure system; the pressure sensor is arranged at the top of the soil sample and is connected with the top of the soil sample. The invention can set different shaft pressures and bidirectional confining pressures for testing. Meanwhile, the device is convenient to move, and can be widely applied to indoor freeze thawing tests of soil samples. The problem that the actual stress state of the soil body cannot be simulated when the conventional equipment performs a freeze thawing test is effectively solved.
Description
Technical Field
The invention relates to the field of soil mechanics tests, in particular to a three-dimensional stress controllable closed environment load-holding freeze thawing soil sample air pressure loading system.
Background
China is the third large frozen earth country in the world, wherein seasonal frozen earth accounts for about 53.5% of the total land area of China. With the continuous development of economic construction in China, more and more large infrastructures are built in the season frozen soil areas. As the foundation of the building and the main body of the geotechnical structure, the strength stability and the deformation stability of the soil body under the long-term freezing and thawing action are important guarantees of the safe service of the superstructure. In the freeze thawing and expanding process of the soil body, the deformation path of the soil body is obviously affected by the initial stress state, so that the arrangement of soil particles and the connection among the soil particles are changed, and the structure and mechanical properties of the soil are changed. At present, the research on the freeze thawing of the soil body is mainly focused on a zero stress state or a completely lateral stress state, and the freeze thawing degradation effect of the mechanical property of the soil body under the three-dimensional stress condition is not considered.
Two prior patents, 201720292939.9 and 201910718941.1, respectively describe a test piece freeze-thawing cycle automation device of a strain control triaxial apparatus and a large freeze-thawing cycle triaxial test equipment for coarse-grained soil. However, their operation relies on a number of complex components, maintenance and troubleshooting are relatively complex, and the samples used are cylindrical, cannot simulate the three-dimensional stress state of the soil mass, and cannot be rapidly tested in batches.
Aiming at the problems, the closed environment load-holding freeze-thawing soil sample air pressure loading system with controllable three-dimensional stress is provided, so that a freeze-thawing cycle test of a soil body under the three-dimensional stress condition is realized, the three-dimensional complex stress state of the soil body in an actual project is simulated more truly, and the defect of research on the influence of the freeze-thawing cycle on the mechanical property of the soil body under the complex stress condition is overcome.
Disclosure of Invention
The invention aims to provide a closed environment load-holding freeze-thawing soil sample air pressure loading system with controllable three-dimensional stress so as to solve the problems in the prior art.
In order to achieve the above object, the present invention provides the following solutions: the invention provides a three-dimensional stress controllable closed environment load-holding freeze-thawing soil sample air pressure loading system, which comprises:
a backing plate;
the pressure chamber is fixed at the top end of the base plate and is coaxially arranged with the base plate, and a soil sample is fixed at the central position in the pressure chamber through a fixing mechanism;
the first confining pressure system is arranged in the pressure chamber and corresponds to the left side and the right side of the soil sample;
the second confining pressure system is arranged in the pressure chamber and corresponds to the front surface and the rear surface of the soil sample;
the shaft pressing system is arranged at the bottom of the pressure chamber and corresponds to the bottom of the soil sample;
the air supply system is used for supplying air to the first confining pressure system, the second confining pressure system and the shaft pressure system;
the pressure sensor is arranged on the top of the soil sample and is connected with the top of the soil sample;
the first confining pressure system, the second confining pressure system and the air supply system are positioned on three coordinate axes of a space rectangular coordinate system taking the center of the soil sample as an origin.
According to the three-dimensional stress controllable closed environment load-holding freeze-thawing soil sample air pressure loading system provided by the invention, the pressure chamber comprises four rigid outer walls and a pressure chamber top plate, the four rigid outer walls are arranged in a rectangular annular structure, and the pressure chamber top plate is positioned at the top of the rigid outer walls and is detachably connected with the rigid outer walls.
According to the three-dimensional stress controllable closed environment load-holding freeze thawing soil sample air pressure loading system provided by the invention, the fixing mechanism comprises a soil sample top plate and a soil sample bottom plate which are respectively arranged at the top end and the bottom end of the soil sample, the soil sample bottom plate is fixedly connected with the rigid outer wall, the soil sample bottom plate is fixed on the top surface of the base plate, through holes are respectively formed in the center positions of the pressure chamber top plate and the soil sample bottom plate, the soil sample top plate is detachably connected in the through holes of the pressure chamber top plate, the base plate is provided with a fixing assembly, and the pressure sensor is detachably connected on the soil sample top plate through the fixing assembly.
According to the three-dimensional stress controllable closed environment load-holding freeze-thawing soil sample air pressure loading system provided by the invention, the fixing assembly comprises the support frame fixedly connected to the top surface of the base plate, the support frame is of a U-shaped structure, the through hole in the center of the top plate of the pressure chamber is internally provided with the fixing plate, the bottom surface of the fixing plate is abutted with the pressure sensor, the support frame is vertically connected with the positioning bolt in a threaded manner, and the positioning bolt is abutted with the top surface of the fixing plate.
According to the three-dimensional stress controllable closed environment load-holding freeze-thawing soil sample air pressure loading system provided by the invention, the air supply system comprises an air pump, and the first confining pressure system, the second confining pressure system and the shaft pressure system are fixedly communicated with the air pump respectively.
According to the three-dimensional stress controllable closed environment load-holding freeze thawing soil sample air pressure loading system provided by the invention, the first confining pressure system comprises two first confining pressure air bags, the two first confining pressure air bags are respectively arranged between the left and right side walls of the soil sample and the corresponding rigid outer wall, the left and right side walls of the pressure chamber are respectively provided with a first confining pressure air hole, the output end of the air pump is fixedly connected with a first confining pressure air pipe, and the first confining pressure air pipe passes through the first confining pressure air holes and is fixedly communicated with the first confining pressure air bags.
According to the three-dimensional stress controllable closed environment load-holding freeze thawing soil sample air pressure loading system provided by the invention, the second confining pressure system comprises two second confining pressure air bags, the two second confining pressure air bags are respectively arranged between the front outer wall and the rear outer wall of the soil sample and the corresponding rigid outer wall, second confining pressure air holes are respectively formed in the front outer wall and the rear outer wall of the pressure chamber, the output end of the air pump is fixedly connected with a second confining pressure air pipe, and the second confining pressure air pipe passes through the second confining pressure air holes and is fixedly communicated with the second confining pressure air bags.
According to the three-dimensional stress controllable closed environment load-holding freeze thawing soil sample air pressure loading system provided by the invention, the axial pressure system comprises an axial pressure air bag fixed between the bottom of the soil sample and the soil sample bottom plate, an axial pressure air hole is formed in the soil sample bottom plate, the output end of the air pump is fixedly communicated with an axial pressure air pipe, and one end of the axial pressure air pipe is fixedly communicated with the axial pressure air bag through the axial pressure air hole.
According to the three-dimensional stress controllable closed environment load-holding freeze-thawing soil sample air pressure loading system provided by the invention, the first confining pressure air pipe, the second confining pressure air pipe and the shaft pressure air pipe are respectively provided with a precise pressure controller, and the precise pressure controllers are used for respectively controlling the pressures of the first confining pressure air bag, the second confining pressure air bag and the shaft pressure air bag.
According to the three-dimensional stress controllable closed environment load-holding freeze-thawing soil sample air pressure loading system provided by the invention, a partition plate is arranged between adjacent rigid outer walls, and an included angle between the partition plate and the rigid outer walls is 45 degrees.
The invention discloses the following technical effects:
1) When the soil sample freezing and thawing test device works, the soil sample is fixed in the pressure chamber, the first confining pressure system, the second confining pressure system and the confining pressure system are respectively arranged at the periphery and the bottom of the soil sample, the air supply system is respectively connected with the first confining pressure system, the second confining pressure system and the confining pressure system, the pressure sensor is fixed at the top of the soil sample through the fixing mechanism, then the air supply system is used for supplying air to the first confining pressure system, the second confining pressure system and the confining pressure system, the pressure sensor is connected with the pressure acquisition system, the pressure acquisition system displays that the bidirectional confining pressure and the axial pressure of the soil sample reach preset values, the pressure chamber is placed in the freezing and thawing circulation box, and the air supply system is positioned outside the pressure chamber, so that the soil sample can be subjected to continuous and stable confining pressure and axial pressure effects during freezing and thawing circulation, and the freezing and thawing test of the soil body can be simulated in the three-way stress state born by the soil body in practical engineering.
2) The invention can set different shaft pressures and any bidirectional confining pressure to test. Meanwhile, the device is convenient to move, and can be widely applied to indoor freeze thawing tests of soil samples. Effectively solves the problems of the prior equipment in the research of mechanical properties under the simulated soil freezing and thawing cycle state.
3) The invention has high simulation precision, and can simulate the three-dimensional stress state borne by the soil body in the actual environment, including horizontal two-way confining pressure and vertical axial pressure.
4) The device can keep the stability of confining pressure and axial pressure in the freeze thawing test, and more truly reflects the influence of the change of the soil structure in the freeze thawing process on the mechanical property of the soil. Compared with the existing freeze-thawing cycle test technology, the method can provide more real and accurate test data.
5) Compared with the existing freeze thawing test equipment, the device is easy to assemble, convenient to operate, easy to maintain and easy to remove faults. The workload of the testers is greatly reduced, and the test efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an isometric view of a loading system for loading a freeze-thaw soil sample under load according to the present invention;
FIG. 2 is a cross-sectional view of a front view of the loading system for holding a freeze-thaw soil sample in accordance with the present invention;
FIG. 3 is a cross-sectional view of a top view of the freeze-thaw soil sample gas pressure loading system of the present invention;
FIG. 4 is an exploded view of the air pressure loading system for holding a freeze-thaw soil sample of the present invention.
Wherein, 1, backing plate; 2. a soil sample; 3. a pressure sensor; 4. a rigid outer wall; 5. a pressure chamber top plate; 6. a soil sample top plate; 7. a soil sample bottom plate; 8. a support frame; 9. a fixing plate; 10. positioning bolts; 11. an air pump; 12. a first confining pressure balloon; 13. a first confining pressure air hole; 14. a first ambient air duct; 15. a second confining pressure balloon; 16. a second confining pressure air hole; 17. a second confining pressure air tube; 18. an axial compression air bag; 19. shaft pressing air holes; 20. an axial plenum; 21. a partition plate; 22. and (5) fixing the screw.
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.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1-4, the present invention provides a three-dimensional stress controllable closed environment load-holding freeze thawing soil sample air pressure loading system, comprising:
a backing plate 1;
the pressure chamber is fixed at the top end of the base plate 1 and is coaxially arranged with the base plate 1, and a soil sample 2 is fixed at the central position in the pressure chamber through a fixing mechanism;
the first confining pressure system is arranged in the pressure chamber and corresponds to the left side and the right side of the soil sample 2;
the second confining pressure system is arranged in the pressure chamber and corresponds to the front surface and the rear surface of the soil sample 2;
the shaft pressing system is arranged at the bottom of the pressure chamber and corresponds to the bottom of the soil sample 2;
the air supply system is used for supplying air to the first confining pressure system, the second confining pressure system and the shaft pressure system;
a pressure sensor 3, the pressure sensor 3 is arranged on the top of the soil sample 2 and is arranged on the top of the soil sample 2;
the pressing directions of the first confining pressure system, the second confining pressure system and the air supply system are positioned on three coordinate axes of a space rectangular coordinate system taking the center of the soil sample 2 as an origin.
When the device works, the soil sample 2 is fixed in the pressure chamber, the first confining pressure system, the second confining pressure system and the shaft pressure system are respectively arranged at the periphery and the bottom of the soil sample 2, the air supply system is respectively connected with the first confining pressure system, the second confining pressure system and the shaft pressure system, the pressure sensor 3 is fixed at the top of the soil sample 2 through the fixing mechanism, then the air supply system supplies air for the first confining pressure system, the second confining pressure system and the shaft pressure system, the pressure sensor 3 is connected with the pressure acquisition system, the pressure acquisition system displays that the bidirectional confining pressure and the shaft pressure applied to the soil sample 2 reach preset values, the pressure chamber is placed in the freeze thawing circulation box, and the air supply system is positioned outside the pressure chamber, so that the soil sample 2 can be subjected to continuous and stable confining pressure and shaft pressure effects while being subjected to freeze thawing circulation, and the freeze thawing test of the soil body can be simulated while the three-dimensional stress state is born under natural environment.
According to a further optimization scheme, the pressure chamber comprises four rigid outer walls 4 and a pressure chamber top plate 5, the four rigid outer walls 4 are arranged in a rectangular annular structure, and the pressure chamber top plate 5 is located at the top of the rigid outer walls 4 and is detachably connected with the rigid outer walls 4. The rigid outer wall 4 is detachably connected with the pressure chamber top plate 5 by means of a set screw 22.
Further optimizing scheme, fixed establishment is including setting up soil sample roof 6 and soil sample bottom plate 7 in soil sample 2 top and bottom respectively, and soil sample bottom plate 7 and rigidity outer wall 4 fixed connection, and soil sample bottom plate 7 is fixed at the top surface of backing plate 1, and the through-hole has been seted up respectively to the central point of pressure chamber roof 5, soil sample bottom plate 7 put, and soil sample roof 6 can be dismantled and connect in the through-hole of pressure chamber roof 5, is provided with fixed subassembly on backing plate 1, and pressure sensor 3 can dismantle through fixed subassembly and connect on soil sample roof 6.
Further optimizing scheme, fixed subassembly includes support frame 8 of fixed connection at backing plate 1 top surface, and support frame 8 is U type structure, is provided with fixed plate 9 in the through-hole at pressure chamber roof 5 center, and fixed plate 9 bottom surface and pressure sensor 3 butt, vertical threaded connection has positioning bolt 10 on the support frame 8, and positioning bolt 10 and the top surface butt of fixed plate 9.
Further optimizing scheme, air feed system includes air pump 11, and first confining pressure system, second confining pressure system, axle pressure system are fixed intercommunication with air pump 11 respectively.
Further optimizing scheme, first confining pressure system includes two first confining pressure air bags 12, and two first confining pressure air bags 12 set up respectively between the soil sample 2 left and right sides wall and corresponding rigidity outer wall 4, have seted up first confining pressure gas pocket 13 respectively on the lateral wall about the pressure chamber, and the output fixedly connected with first confining pressure trachea 14 of air pump 11, first confining pressure trachea 14 pass first confining pressure gas pocket 13 and first confining pressure air bag 12 fixed communication.
Further optimizing scheme, the second confining pressure system includes two second confining pressure air bags 15, and two second confining pressure air bags 15 set up respectively between outer wall and corresponding rigidity outer wall 4 around soil sample 2, have seted up second confining pressure gas pocket 16 respectively on the outer wall around the pressure chamber, and the output fixedly connected with second confining pressure trachea 17 of air pump 11, second confining pressure trachea 17 pass second confining pressure gas pocket 16 and second confining pressure air bag 15 fixed communication.
Further optimizing scheme, axle pressure system is including fixing the axle pressure gasbag 18 between soil sample 2 bottom and soil sample bottom plate 7, has seted up axle pressure gas pocket 19 on the soil sample bottom plate 7, and the fixed intercommunication of the output of air pump 11 has axle pressure trachea 20, and axle pressure trachea 20 one end passes axle pressure gas pocket 19 and axle pressure gasbag 18 fixed intercommunication.
In a further optimized scheme, the first confining pressure air pipe 14, the second confining pressure air pipe 17 and the shaft pressure air pipe 20 are respectively provided with a precise pressure controller, and the precise pressure controllers are used for respectively controlling the pressures of the first confining pressure air bag 12, the second confining pressure air bag 15 and the shaft pressure air bag 18.
The air pump 11 is controlled by the precise pressure controller to restart into the first confining pressure air bag 12, the second confining pressure air bag 15 and the shaft pressure air bag 18, so that the shaft pressure and confining pressure of the soil sample 2 are precisely controlled.
In a further optimization scheme, a partition plate 21 is arranged between the adjacent rigid outer walls 4, and an included angle between the partition plate 21 and the rigid outer walls 4 is 45 degrees. The arrangement of the partition plate 21 separates the adjacent first confining pressure air bags 12 and the second confining pressure air bags 15, and the pressures of the opposite air bags are equal, so that the bidirectional unequal confining pressure of the soil body in the natural environment can be simulated.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (6)
1. The utility model provides a controllable closed environment of three-dimensional stress holds load freeze thawing soil sample atmospheric pressure loading system which characterized in that includes:
a backing plate (1);
the pressure chamber is fixed at the top end of the base plate (1) and is coaxially arranged with the base plate (1), and a soil sample (2) is fixed at the central position in the pressure chamber through a fixing mechanism; the pressure chamber comprises four rigid outer walls (4) and a pressure chamber top plate (5), the four rigid outer walls (4) are arranged in a rectangular annular structure, and the pressure chamber top plate (5) is positioned at the top of the rigid outer walls (4) and is detachably connected with the rigid outer walls (4); a partition plate (21) is arranged between the adjacent rigid outer walls (4), and an included angle between the partition plate (21) and the rigid outer walls (4) is 45 degrees;
the first confining pressure system is arranged in the pressure chamber and corresponds to the left side and the right side of the soil sample (2);
the second confining pressure system is arranged in the pressure chamber and corresponds to the front surface and the rear surface of the soil sample (2);
the axial compression system is arranged at the bottom of the pressure chamber and corresponds to the bottom of the soil sample (2);
the air supply system is used for supplying air to the first confining pressure system, the second confining pressure system and the shaft pressure system;
a pressure sensor (3), wherein the pressure sensor (3) is arranged on the top of the soil sample (2) and is contacted with the top of the soil sample (2);
the first confining pressure system, the second confining pressure system and the shaft pressure system are positioned on three coordinate axes of a space rectangular coordinate system taking the center of the soil sample (2) as an origin;
the fixing mechanism comprises a soil sample top plate (6) and a soil sample bottom plate (7) which are respectively arranged at the top end and the bottom end of the soil sample (2), the soil sample bottom plate (7) is fixedly connected with the rigid outer wall (4), the soil sample bottom plate (7) is fixed on the top surface of the base plate (1), through holes are respectively formed in the center positions of the pressure chamber top plate (5) and the soil sample bottom plate (7), the soil sample top plate (6) is detachably connected in the through holes of the pressure chamber top plate (5), a fixing assembly is arranged on the base plate (1), and the pressure sensor (3) is detachably connected on the soil sample top plate (6) through the fixing assembly;
the fixing assembly comprises a supporting frame (8) fixedly connected to the top surface of the base plate (1), the supporting frame (8) is of a U-shaped structure, a fixing plate (9) is arranged in the through hole in the center of the pressure chamber top plate (5), the bottom surface of the fixing plate (9) is abutted to the pressure sensor (3), a positioning bolt (10) is vertically connected to the supporting frame (8) in a threaded mode, and the positioning bolt (10) is abutted to the top surface of the fixing plate (9).
2. The three-dimensional stress controllable closed environment load-holding freeze-thawing soil sample air pressure loading system as defined in claim 1, wherein: the air supply system comprises an air pump (11), and the first confining pressure system, the second confining pressure system and the shaft pressure system are fixedly communicated with the air pump (11) respectively.
3. The three-dimensional stress controllable closed environment load-holding freeze thawing soil sample air pressure loading system as defined in claim 2, wherein: the first confining pressure system comprises two first confining pressure air bags (12), the two first confining pressure air bags (12) are respectively arranged between the left side wall and the right side wall of the soil sample (2) and the corresponding rigid outer wall (4), first confining pressure air holes (13) are respectively formed in the left side wall and the right side wall of the pressure chamber, the output end of the air pump (11) is fixedly connected with a first confining pressure air pipe (14), and the first confining pressure air pipe (14) passes through the first confining pressure air holes (13) and is fixedly communicated with the first confining pressure air bags (12).
4. A three-dimensional stress controllable closed environment load-holding freeze thawing soil sample air pressure loading system as defined in claim 3, wherein: the second confining pressure system comprises two second confining pressure air bags (15), the two second confining pressure air bags (15) are respectively arranged between the front outer wall and the rear outer wall of the soil sample (2) and the corresponding rigid outer wall (4), second confining pressure air holes (16) are respectively formed in the front outer wall and the rear outer wall of the pressure chamber, the output end of the air pump (11) is fixedly connected with a second confining pressure air pipe (17), and the second confining pressure air pipe (17) penetrates through the second confining pressure air holes (16) and the second confining pressure air bags (15) to be fixedly communicated.
5. The three-dimensional stress controllable closed environment load-holding freeze thawing soil sample air pressure loading system as recited in claim 4, wherein: the axial compression system comprises an axial compression air bag (18) fixed between the bottom of the soil sample (2) and the soil sample bottom plate (7), an axial compression air hole (19) is formed in the soil sample bottom plate (7), an axial compression air pipe (20) is fixedly communicated with the output end of the air pump (11), and one end of the axial compression air pipe (20) penetrates through the axial compression air hole (19) and is fixedly communicated with the axial compression air bag (18).
6. The three-dimensional stress controllable closed environment load-holding freeze thawing soil sample air pressure loading system as defined in claim 5, wherein: the first confining pressure air pipe (14), the second confining pressure air pipe (17) and the shaft pressure air pipe (20) are respectively provided with a precise pressure controller, and the precise pressure controllers are used for respectively controlling the pressure of the first confining pressure air bag (12), the second confining pressure air bag (15) and the shaft pressure air bag (18).
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