CN113959861A - Rock testing device and method for thermal coupling - Google Patents
Rock testing device and method for thermal coupling Download PDFInfo
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- CN113959861A CN113959861A CN202111162699.8A CN202111162699A CN113959861A CN 113959861 A CN113959861 A CN 113959861A CN 202111162699 A CN202111162699 A CN 202111162699A CN 113959861 A CN113959861 A CN 113959861A
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- 239000011435 rock Substances 0.000 title claims abstract description 89
- 238000012360 testing method Methods 0.000 title claims abstract description 35
- 230000008878 coupling Effects 0.000 title claims abstract description 14
- 238000010168 coupling process Methods 0.000 title claims abstract description 14
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title description 6
- 230000005540 biological transmission Effects 0.000 claims abstract description 46
- 230000008859 change Effects 0.000 claims description 10
- 239000010720 hydraulic oil Substances 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims 3
- 239000010959 steel Substances 0.000 claims 3
- 238000010276 construction Methods 0.000 abstract description 3
- 238000010998 test method Methods 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 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
- G01N3/18—Performing tests at high or low temperatures
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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
- 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
- G01N3/068—Special adaptations of indicating or recording means with optical 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
- G01N2203/0048—Hydraulic 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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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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
- G01N2203/0226—High temperature; Heating 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
- G01N2203/023—Pressure
- G01N2203/0232—High pressure
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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
- G01N2203/0236—Other environments
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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
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a thermal coupling rock test device and a thermal coupling rock test method, and the device comprises a portable outer frame body, wherein the portable outer frame body is composed of a top cover (1) and a frame body (2), the middle part of the top cover (1) is rotatably connected with a force transmission shaft (3), the bottom of the force transmission shaft (3) is correspondingly provided with a loading plate (5), the top of the force transmission shaft (3) is connected with a loading handle (4), the top cover (1) is detachably connected with a hydraulic transmission device through a hydraulic pipe (6), a confining pressure cavity (7) of the frame body (2) can contain the loading plate (5) and a rock sample (8) to be tested, and the inner wall of the frame body (2) is provided with a pressure sensor (9). The invention has the advantages of convenient movement, safety, reliability, simple structure and convenient construction on the premise of simultaneously applying temperature and axial force to the rock mass.
Description
Technical Field
The invention relates to the field of rock mechanics and rock tests, in particular to a rock test device and method with thermal coupling.
Background
With the gradual development of earth science from shallow to deep, people have stronger requirements for deeply knowing the mechanical properties of deep rock masses, and face breakthrough of a plurality of key technical problems and improvement of theories in the fields of deep space utilization, deep resource intelligent development, deep well drilling and the like, wherein the internal relation of the deep rock mass physical mechanical properties, deformation control and temperature coupling action is one of the more concerned hot spots. At present, the mastered knowledge of the physical mechanics of shallow rock and the disaster prevention and treatment technology cannot be directly applied to deep strata, so that the research on the physical mechanics of rock considering the deep stratum environment is very necessary and urgent.
The physical and mechanical properties and deformation characteristics of deep rocks can change remarkably under the action of high ground stress and temperature, at present, researchers at home and abroad adopt test devices such as a triaxial apparatus to load the rocks in order to deeply research the destruction characteristics of the rocks, but because the accuracy of temperature control is poor, the triaxial apparatus is too large and cannot move, the problems that the high-temperature condition is difficult to realize in an indoor triaxial apparatus and the like are solved, and the researchers mainly carry out rock strength test under the action of heat or carry out thermal coupling based on a numerical simulation technology and lack authenticity and reliability.
Disclosure of Invention
In view of the shortcomings of the prior art, a first object of the present invention is to provide a thermally coupled rock testing device. The invention has the advantages of convenient movement, safety, reliability, simple structure and convenient construction on the premise of simultaneously applying temperature and axial force to the rock mass.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a rock testing device of thermal coupling which characterized in that: including portable outer frame body, portable outer frame body comprises top cap and support body, and the top cap middle part is rotated and is connected the biography power axle, corresponds in the below of biography power axle and sets up the loading plate, and the loading handle is connected at the biography power axle top, and the top cap passes through the hydraulic pressure pipe and can dismantle the connection hydraulic transmission device, can holding loading plate and the rock specimen that awaits measuring in the confining pressure intracavity of support body, be equipped with pressure sensor on the support body inner wall.
Further: the bottom plate of the bottom of the frame body is provided with a groove, the pressure sensor is arranged in the groove, the surface of the pressure sensor is in contact with the rock sample to be detected, and the groove is positioned in the middle of the bottom plate of the bottom of the frame body.
Further: the bottom of the force transmission shaft is conical, and the top surface of the loading plate is provided with a conical groove matched with the bottom of the force transmission shaft.
Further: and a valve and a pressure gauge are arranged on the hydraulic pipe.
Further: and a flexible gasket is arranged at the bottom of the loading plate, and the bottom of the flexible gasket is contacted with the rock sample to be tested.
Further: the outer diameter of the loading plate is matched with the width of the frame body, and a gap is reserved.
A second object of the present invention is to: the method for testing the rock by thermal coupling is characterized in that the portable outer frame body is used as a testing device of a rock sample to be tested, and the testing method comprises the following steps:
s1, placing the pressure sensor into a bottom plate groove at the bottom of the frame body, and placing the rock sample to be detected into a confining pressure cavity of the frame body;
s2, sequentially placing the flexible gasket and the loading plate on the top end of the rock sample to be tested, penetrating the force transmission shaft into the confining pressure cavity through the top cover, rotating the loading handle to enable the bottom of the force transmission shaft to be in contact with the loading plate, and applying pressure downwards to fix the rock sample to be tested;
s3, connecting the hydraulic pipe with a hydraulic transmission device, opening a valve, injecting high-temperature-resistant hydraulic oil into the confining pressure cavity through the hydraulic transmission device, recording a hydraulic value by a pressure gauge, and closing the valve and detaching the hydraulic transmission device when the confining pressure reaches a designed value;
s4, rotating the loading handle through the connecting rod, enabling the force transmission shaft to gradually go deep into the confining pressure cavity downwards, uniformly applying loading force to the rock sample to be tested through the loading plate and the flexible gasket, and recording the axial loading force applied to the rock sample to be tested by the pressure sensor;
s5, when the axial load force reaches a designed value, stopping rotating the loading handle, and applying constant axial and lateral force to the rock sample to be tested;
s6, putting the whole test device into a thermostat, heating to a design temperature, keeping the test device in a constant temperature state for a period of time, taking the test device out of the thermostat, cooling to room temperature, removing confining pressure and axial force, and taking out a rock sample;
s7, placing the rock sample slice into a CT or a galvanometer scanner to observe the structure and composition change of the rock sample, and analyzing the mesoscopic change rule of the rock under thermal coupling;
s8, placing the next group of rock samples to be tested into the confining pressure cavity of the frame body, repeating the steps S3-S7, changing the design of confining pressure, axial force, temperature and holding time in a constant temperature state, and analyzing the mesoscopic change rules of the rocks under the action of different temperatures and loads.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the portable outer frame body is relatively small in size, and has the advantages of convenience in moving, safety, reliability, simple structure and convenience in construction.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of the charging handle of the present invention.
Reference numerals: 1-a top cover; 2-a frame body; 3-a force transmission shaft; 4-a loading handle; 5-a loading plate; 6-hydraulic pipe; 7-confining pressure cavity; 8-a rock sample to be tested; 9-a pressure sensor; 10-a groove; 11-a tapered slot; 12-valve and pressure gauge; 13-connecting ring; 14-a connecting rod; 15-flexible gasket.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in conjunction with the specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the present invention; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the invention.
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
As shown in fig. 1 to 2, a rock test device of thermal coupling, including portable outer frame body, portable outer frame body comprises top cap 1 and support body 2, and 1 middle part of top cap rotates connects power transmission shaft 3, the axle body and the upper portion of power transmission shaft 3 are all carved with the screw thread, and 3 axle bodies of power transmission shaft and top cap 1 threaded connection, loading handle 4 are connected at 3 tops of power transmission shaft, correspond in the below of power transmission shaft 3 and set up loading plate 5, can be with on the loading plate 5 of holding down force during the power transmission shaft downstream, can break away from loading plate 5 during the upward movement, and top cap 1 can dismantle through hydraulic pressure pipe 6 and connect hydraulic transmission, can holding loading plate 5 and the rock specimen 8 that awaits measuring in the confining pressure chamber 7 of support body 2, be equipped with pressure sensor 9 on the 2 inner walls of support body.
The rock sample 8 to be tested is set to be cylindrical, the ratio of the height to the diameter is 2, the diameter can be designed to be 10 mm, 20 mm and 50mm, and the rock test device provided by the invention is set to be matched with the size of the rock sample 8 to be tested. Before the rock sample 8 to be tested is put into the frame body 2, the outer surface of the rock sample 8 to be tested is wrapped by the thermoplastic film.
The outer surfaces of the top cover 1 and the frame body 2 are respectively provided with a connecting flange at the joint, the connecting flange is provided with a plurality of connecting holes, and the connecting flanges of the top cover 1 and the frame body 2 are connected through bolts, so that the top cover 1 and the frame body 2 are fixedly connected, and a sealing ring and a gasket are arranged in the middle of the two connecting flanges for sealing when the two connecting flanges are connected.
A groove 10 is formed in the bottom base plate of the frame body 2, a pressure sensor 9 is arranged in the groove 10, the surface of the pressure sensor 9 is in contact with a rock sample 8 to be detected, and the groove 10 is located in the middle of the bottom base plate of the frame body 2. The pressure sensor 9 is arranged at the bottom end of the rock sample 8 to be detected, and monitors the action resultant force of the hydraulic pressure and the force transmission shaft 3 applied to the vertical direction of the rock sample.
The bottom of the force transmission shaft 3 is conical, the top surface of the loading plate 5 is provided with a conical groove 11 matched with the bottom of the force transmission shaft 3, and the conical groove 11 is used as a bearing guide interface. The conical groove 11 is specifically processed into a conical concave groove, so that the force transmission shaft 3 and the loading plate 5 can be fully contacted and automatically centered, the loading force is applied along the axis, and no eccentric force is generated.
And a valve and a pressure gauge 12 are arranged on the hydraulic pipe 6. The working process of the hydraulic transmission device is that high-temperature-resistant hydraulic oil is loaded into the hydraulic transmission device, then a jack in the hydraulic transmission device applies force to the high-temperature-resistant hydraulic oil, and the high-temperature-resistant hydraulic oil is directly compressed and conveyed into the surrounding rock cavity 7 through the hydraulic pipe 6.
The loading handle 4 is provided with a connecting ring 13, the middle part of the connecting ring 13 is in threaded connection with the force transmission shaft 3, and a plurality of connecting rods 14 are arranged on the outer side of the connecting ring 13 in the circumferential direction.
And a flexible gasket 15 is arranged at the bottom of the loading plate 5, and the bottom of the flexible gasket 15 is in contact with the rock sample 8 to be tested. The flexible gasket 15 can be a plastic gasket, and the plastic gasket is made of high-temperature-resistant polyester materials, has certain flexibility, and can enable loading force to be uniformly applied to the rock sample.
And a sealing rubber ring is arranged at the connecting part of the force transmission shaft 3 and the top cover 1 for sealing.
The outer diameter of the loading plate 5 is matched with the width of the frame body 2, and a gap is reserved for applying high-temperature-resistant hydraulic oil. The loading plate 5 can slide up and down on the inner wall of the frame body 2.
The invention also provides a thermal coupling rock test method, wherein the portable outer frame body 2 is prefabricated to serve as a test device of a rock sample 8 to be tested, and the test method comprises the following steps:
s1, placing the pressure sensor 9 into the bottom plate groove 10 at the bottom of the frame body 2, and then placing the rock sample 8 to be tested into the confining pressure cavity 7 of the frame body 2;
s2, sequentially placing the flexible gasket 15 and the loading plate 5 at the top end of the rock sample 8 to be tested, penetrating the force transmission shaft 3 through the top cover 1 and extending into the confining pressure cavity 7, rotating the loading handle 4 to enable the bottom of the force transmission shaft 3 to be in contact with the loading plate 5, and applying pressure downwards to fix the rock sample 8 to be tested;
s3, connecting the hydraulic pipe 6 with a hydraulic transmission device, opening a valve, injecting high-temperature-resistant hydraulic oil into the confining pressure cavity 7 through the hydraulic transmission device, recording a hydraulic value by a pressure gauge, and closing the valve and detaching the hydraulic transmission device when the confining pressure reaches a designed value;
s4, rotating the loading handle 4 through the connecting rod 14, enabling the force transmission shaft 3 to gradually go deep into the confining pressure cavity 7 downwards, uniformly applying loading force to the rock sample 8 to be tested through the loading plate 5 and the flexible gasket 15, and recording the axial loading force applied to the rock sample 8 to be tested by the pressure sensor 9;
s5, when the axial load force reaches a designed value, the loading handle 4 stops rotating, and at the moment, the rock sample 8 to be measured is subjected to constant axial and lateral force;
s6, putting the whole test device into a thermostat, heating to a design temperature, keeping the test device in a constant temperature state for a period of time, taking the test device out of the thermostat, cooling to room temperature, removing confining pressure and axial force, and taking out a rock sample;
s7, placing the rock sample slice into a CT or a galvanometer scanner to observe the structure and composition change of the rock sample, and analyzing the mesoscopic change rule of the rock under thermal coupling;
s8, placing the next group of rock samples 8 to be tested into the confining pressure cavity 7 of the frame body 2, repeating the steps S3-S7, changing the design of confining pressure, axial force, temperature and holding time under a constant temperature state, and analyzing the rock microscopic change rules under the action of different temperatures and loads.
In the step S6, the valve is opened, the confining pressure in the confining pressure chamber 7 is removed by the hydraulic transmission device, the loading handle 4 is rotated in the reverse direction, and the axial force is removed.
In the step S8, in the experiment, different confining pressure, axial force, and temperature can be set according to the requirement, and the hydraulic design value of the high-temperature resistant hydraulic oil can be 0, 1, 2, 5, and 10 MPa; the axial load force is applied by rotating the handle, so that the load borne by the end part of the test sample can be 0, 10, 30 or 50 MPa; the temperature of the constant temperature box can be designed to be 0, 100, 200 and 500 ℃; the holding time of the incubator can be 12, 24, 36 and 48 hours.
According to the description of the invention and the accompanying drawings, a person skilled in the art can easily make or use a thermally coupled rock testing apparatus and method of the invention and can produce the positive effects described in the invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (7)
1. A rock testing device of thermal coupling which characterized in that: including portable outer frame body, portable outer frame body comprises top cap (1) and support body (2), and top cap (1) middle part is rotated and is connected dowel steel (3), corresponds in the below of dowel steel (3) and sets up loading plate (5), and loading handle (4) are connected at dowel steel (3) top, and top cap (1) can be dismantled through hydraulic pressure pipe (6) and connect hydraulic transmission device, can holding loading plate (5) and rock specimen (8) that await measuring in confining pressure chamber (7) of support body (2), be equipped with pressure sensor (9) on support body (2) inner wall.
2. A thermally coupled rock testing apparatus according to claim 1, wherein: a bottom plate at the bottom of the frame body (2) is provided with a groove (10), a pressure sensor (9) is arranged in the groove (10), the surface of the pressure sensor (9) is in contact with a rock sample (8) to be detected, and the groove (10) is located in the middle of the bottom plate at the bottom of the frame body (2).
3. A thermally coupled rock testing apparatus according to claim 1, wherein: the bottom of the force transmission shaft (3) is conical, and the top surface of the loading plate (5) is provided with a conical groove (11) matched with the bottom of the force transmission shaft (3).
4. A thermally coupled rock testing apparatus according to claim 1, wherein: and a valve and a pressure gauge (12) are arranged on the hydraulic pipe (6).
5. A thermally coupled rock testing apparatus according to claim 1, wherein: the bottom of the loading plate (5) is provided with a flexible gasket (15), and the bottom of the flexible gasket (15) is in contact with the rock sample (8) to be tested.
6. A thermally coupled rock testing apparatus according to claim 1, wherein: the outer diameter of the loading plate (5) is matched with the width of the frame body (2), and a gap is reserved.
7. A thermally coupled rock testing method, characterized in that the portable outer frame body (2) of claim 1 is used as a testing device for a rock sample (8) to be tested, the testing method comprising the following steps:
s1, placing the pressure sensor (9) into a bottom plate groove (10) at the bottom of the frame body (2), and then placing the rock sample (8) to be tested into a confining pressure cavity (7) of the frame body (2);
s2, sequentially placing the flexible gasket (15) and the loading plate (5) at the top end of the rock sample (8) to be tested, penetrating the force transmission shaft (3) through the top cover (1) and extending into the confining pressure cavity (7), rotating the loading handle (4) to enable the bottom of the force transmission shaft (3) to be in contact with the loading plate (5), and applying pressure downwards to fix the rock sample (8) to be tested;
s3, connecting the hydraulic pipe (6) with a hydraulic transmission device, opening a valve, injecting high-temperature-resistant hydraulic oil into the confining pressure cavity (7) through the hydraulic transmission device, recording a hydraulic value by a pressure gauge, and closing the valve and removing the hydraulic transmission device when the confining pressure reaches a designed value;
s4, rotating the loading handle (4) through the connecting rod (14), enabling the force transmission shaft (3) to gradually go deep into the confining pressure cavity (7) downwards, uniformly applying loading force to the rock sample (8) to be tested through the loading plate (5) and the flexible gasket (15), and recording the axial load force borne by the rock sample (8) to be tested through the pressure sensor (9);
s5, when the axial load force reaches a designed value, the loading handle (4) stops rotating, and at the moment, the rock sample (8) to be tested is subjected to constant axial and lateral force;
s6, putting the whole test device into a thermostat, heating to a design temperature, keeping the test device in a constant temperature state for a period of time, taking the test device out of the thermostat, cooling to room temperature, removing confining pressure and axial force, and taking out a rock sample;
s7, placing the rock sample slice into a CT or a galvanometer scanner to observe the structure and composition change of the rock sample, and analyzing the mesoscopic change rule of the rock under thermal coupling;
s8, placing the next group of rock samples (8) to be tested into the confining pressure cavity (7) of the frame body (2), repeating the steps S3-S7, changing the design confining pressure, axial force, temperature and holding time under a constant temperature state, and analyzing the rock microscopic change rules under the action of different temperatures and loads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111162699.8A CN113959861A (en) | 2021-09-30 | 2021-09-30 | Rock testing device and method for thermal coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111162699.8A CN113959861A (en) | 2021-09-30 | 2021-09-30 | Rock testing device and method for thermal coupling |
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| CN113959861A true CN113959861A (en) | 2022-01-21 |
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| CN202111162699.8A Pending CN113959861A (en) | 2021-09-30 | 2021-09-30 | Rock testing device and method for thermal coupling |
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