CN112067458B - Rock true triaxial test system and method integrating microcosmic CT (computed tomography) online scanning - Google Patents
Rock true triaxial test system and method integrating microcosmic CT (computed tomography) online scanning Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 99
- 238000012360 testing method Methods 0.000 title claims abstract description 41
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- 238000002591 computed tomography Methods 0.000 title claims description 61
- 238000010438 heat treatment Methods 0.000 claims abstract description 38
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 238000004806 packaging method and process Methods 0.000 claims abstract description 7
- 239000010720 hydraulic oil Substances 0.000 claims description 16
- 238000006073 displacement reaction Methods 0.000 claims description 11
- 238000009413 insulation Methods 0.000 claims description 8
- 229920000515 polycarbonate Polymers 0.000 claims description 6
- 239000004417 polycarbonate Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000010998 test method Methods 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
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- 239000007769 metal material Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
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- 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
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- G—PHYSICS
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- 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
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- G01N2203/0048—Hydraulic means
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- 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
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
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- 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
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- 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
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- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
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Abstract
A rock true triaxial test system and method fusing microscopic CT online scanning, the system comprises a true triaxial tester, an automatic turntable, a CT ray source, a CT detector, a control cabinet and a control console; the true triaxial test instrument is arranged on the automatic turntable, is positioned between the CT ray source and the CT detector, is connected with the control cabinet through a gas-liquid pipeline, and is electrically connected with the control cabinet. The method comprises the following steps: packaging a rock sample and sending the rock sample into a true triaxial tester, adjusting the positions of a CT ray source and a CT detector, switching on the power supply of each device, applying confining pressure and axial load and starting heating, starting an automatic turntable to enable the true triaxial tester to rotate, carrying out real-time online scanning on the rock sample at the center of the true triaxial tester through the CT ray source and the CT detector, and recording and storing scanning data; the true triaxial tester turns to set angle and then closes the automatic turntable; and resetting the true triaxial tester, unloading confining pressure and axial load, closing heating, and reconstructing according to a scanning data image.
Description
Technical Field
The invention belongs to the technical field of rock mechanics and engineering, and particularly relates to a rock true triaxial test system and method integrating micro CT (computed tomography) online scanning.
Background
In the field of rock mechanics, mechanical testing of rock samples plays an important role and plays an essential role in rock mechanics research. In the field of rock mechanics, a plurality of test methods are provided, including a uniaxial test, a conventional triaxial test and a true triaxial test, and the true triaxial test is an important way for exploring rock mechanical properties and has an irreplaceable role in the field of rock mechanics.
In the true triaxial test, the rock sample is in a closed true triaxial test machine, the state of the rock sample under a certain stress condition cannot be observed and analyzed in real time, and only the damage form or the crack state of the rock sample can be analyzed after the test. And when a typical true triaxial test system is adopted, the fracture expansion process of a rock sample and the real-time change of the sample under each stress state in the test process cannot be analyzed. However, in the rock mechanical test process, the state at each moment and the real-time evolution process have important significance for revealing rock mechanical properties.
Therefore, the change process of the internal structure of the geotechnical material in the stress process can be visually, quantitatively and nondestructively measured by the CT scanning technology. However, in the existing rock sample CT scanning systems, after the rock test is completed and taken out from the loading bin, the rock sample CT scanning systems scan and analyze the crack morphology and the failure rule of the rock sample CT scanning systems.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a rock true triaxial test system and method integrating microcosmic CT online scanning, which can perform 360-degree real-time CT scanning on a rock sample in the high-temperature high-pressure true triaxial test process, can also perform real-time CT scanning on the rock sample in a testing machine at any azimuth angle, can generate a rock sample real-time state image under the high-temperature high-pressure true triaxial stress condition through an image reconstruction technology, is used for revealing the real-time deformation and damage evolution rule of a rock material under the true triaxial stress condition, and provides an important means for further revealing the rock mechanical properties.
In order to achieve the purpose, the invention adopts the following technical scheme: a rock true triaxial test system integrating microcosmic CT online scanning comprises a true triaxial tester, an automatic turntable, a CT ray source, a CT detector, a control cabinet and a control console; the true triaxial test instrument is arranged on the automatic turntable, is positioned between the CT ray source and the CT detector, is connected with the control cabinet through a gas-liquid pipeline, and is electrically connected with the control cabinet; the control cabinet is used for controlling loading and unloading actions of the true triaxial tester; the control console is used for sending control instructions to the true triaxial tester and the automatic turntable and storing and processing CT scanning data and images generated by the cooperation of the CT ray source and the CT detector.
The true triaxial tester comprises a first large main stress actuator, a second large main stress actuator, a first middle main stress actuator, a second middle main stress actuator, a loading bin, a clamping bin and a hydraulic oil tank; the hydraulic oil tank is fixedly arranged on the automatic rotary table, the loading bin is fixedly arranged at the top of the hydraulic oil tank, a clamping bin mounting hole is vertically formed in the center of the loading bin, and the clamping bin is vertically and fixedly arranged in the clamping bin mounting hole of the loading bin; the first large main stress actuator is vertically and fixedly arranged at the top of the clamping chamber, the second large main stress actuator is vertically and fixedly arranged at the bottom of the clamping chamber, and the second large main stress actuator is hidden and arranged in the hydraulic oil tank; the first middle main stress actuator is horizontally and fixedly arranged at the left side part of the loading bin, and the second middle main stress actuator is horizontally and fixedly arranged at the right side part of the loading bin; a heating box is arranged in the center of the clamping bin, loading holes are formed in the wall of the heating box on the upper, lower, left and right sides, and a pressure head, a heat insulation pad and a pressing block are respectively arranged in each loading hole from inside to outside; the first large main stress actuator, the second large main stress actuator, the first middle main stress actuator and the second middle main stress actuator are directly matched with pressing blocks in the corresponding loading holes in a force application manner; the heating plate is arranged on the inner surface of a box plate at the bottom of the heating box, and the center of the heating box is used for placing a rock sample.
The automatic turntable comprises a turntable bottom plate, a turntable box body, a turntable top plate, a turntable rotating plate, a rotation driving motor and a rotating shaft rod; the turntable bottom plate is horizontally and fixedly arranged on the ground, the turntable box body is fixedly arranged on the turntable bottom plate, and the turntable top plate is horizontally and fixedly arranged at the top of the turntable box body; the rotary driving motor is vertically arranged at the center of the inner part of the rotary table box body, a motor shaft of the rotary driving motor faces upwards, the rotary shaft rod vertically penetrates through the rotary table top plate, and the lower end of the rotary shaft rod is fixedly connected with the motor shaft of the rotary driving motor; the rotary table rotating plate is horizontally arranged above the rotary table top plate, the upper end of the rotary shaft rod is fixedly connected with the rotary table rotating plate, and the rotary table rotating plate has a rotating degree of freedom relative to the rotary table top plate; the hydraulic oil tank is fixedly arranged on the upper surface of the turntable rotating plate.
The first large main stress actuator, the second large main stress actuator, the first middle main stress actuator, the second middle main stress actuator, the loading bin and the clamping bin are all made of polycarbonate, and the turntable bottom plate, the turntable box body, the turntable top plate, the turntable revolving plate and the rotating shaft rod are all made of rigid metal materials; the heating box and the heat insulation pad are both made of composite ceramics; the gas-liquid pipeline adopts a flexible pipeline.
The rock sample is packaged by an interlocking type clamp, an LVDT displacement sensor for measuring the deformation of the rock sample in the large main stress direction and the middle main stress direction is arranged on the interlocking type clamp, and an LVDT displacement sensor for measuring the deformation of the rock sample in the small main stress direction is arranged between the interlocking type clamp and the rock sample; the material of each buckled clamp is polycarbonate or high-strength aluminum alloy.
The heating box adopts a combined type assembling structure, and a front side box plate and a rear side box plate of the heating box are packaged and fixed by a through type through long screw rod.
A rock true triaxial test method fusing on-line scanning of micro CT adopts the rock true triaxial test system fusing on-line scanning of micro CT, which comprises the following steps:
the method comprises the following steps: packaging the prepared rock sample into an interlocking type clamp, installing the LVDT displacement sensors in three main stress directions in place to finally form a combination, and then sending the combination into a true triaxial tester;
step two: firstly, completing the wiring connection of each sensor, and then completing the packaging of the heating box;
step three: adjusting the positions of the CT ray source and the CT detector to ensure that the CT ray source and the CT detector are opposite to the rock sample at the center of the true triaxial tester;
step four: arranging the gas-liquid pipeline to prevent the gas-liquid pipeline from knotting when the true triaxial tester rotates;
step five: switching on a power supply of a rotary driving motor, and simultaneously switching on power supplies of a CT ray source and a CT detector;
step six: firstly, controlling a true triaxial tester to apply confining pressure to a rock sample to a set value, then starting a heating plate to enable the environmental temperature of the rock sample to reach the set value, then controlling the true triaxial tester to synchronously apply middle main stress and maximum main stress to the rock sample to reach the middle main stress set value, and finally controlling the true triaxial tester to apply axial load to the rock sample;
step seven: firstly, setting the rotation rate of a turntable rotating plate through a control console, enabling the control console to give a developed starting instruction to a rotation driving motor at a specified time, further enabling the rotation driving motor to drive the turntable rotating plate to rotate according to the set rotation rate, driving a true triaxial tester thereon to synchronously rotate, and observing the winding condition of a gas-liquid pipeline during rotation;
step eight: in the rotation process of the true triaxial tester, a rock sample at the center of the true triaxial tester is scanned on line in real time through a CT ray source and a CT detector, and scanning data is recorded and stored by a console;
step nine: when the true triaxial tester rotates for a circle or rotates to a set angle, the rotation driving motor is turned off, so that the true triaxial tester stops rotating;
step ten: controlling the true triaxial tester to rotate repeatedly, and continuously carrying out real-time online scanning on the rock sample at the center of the true triaxial tester through the CT ray source and the CT detector in the rotating process of the true triaxial tester until the rock sample loading test is finished;
step eleven: reversely starting a rotation driving motor, controlling the true triaxial tester to rotate to an initial position at a set rotation rate, unloading the maximum main stress and the middle main stress, closing the heating plate, unloading confining pressure after the ambient temperature is recovered to normal temperature, and finally taking out the rock sample;
step twelve: and performing image reconstruction according to the obtained scanning projection data, and obtaining the deformation and internal crack states of the rock sample at any time or in any stress state.
The invention has the beneficial effects that:
the rock true triaxial test system and method fusing microcosmic CT on-line scanning can perform 360-degree real-time CT scanning on a rock sample in the high-temperature high-pressure true triaxial test process, can also perform real-time CT scanning on the rock sample in a testing machine at any azimuth angle, can generate a real-time state image of the rock sample under the high-temperature high-pressure true triaxial stress condition through an image reconstruction technology, are used for revealing real-time deformation and damage evolution rules of a rock material under the true triaxial stress condition, and provide an important means for further revealing rock mechanical properties.
Drawings
FIG. 1 is a top view of a rock true triaxial test system with on-line scanning by a fusion micro CT according to the present invention;
FIG. 2 is a top view of a rock true triaxial test system with on-line scanning by a fusion micro CT (true triaxial tester rotating 60 °) according to the present invention;
FIG. 3 is a front view of a rock true triaxial test system with on-line scanning by a fusion micro CT according to the present invention;
FIG. 4 is a side view of a rock true triaxial test system with on-line scanning by fused micro CT according to the present invention (control cabinet and console are not shown);
FIG. 5 is a top view (partially in section) of a true triaxial tester of the present invention;
FIG. 6 is an elevational view (in full section) of an assembly of the true triaxial tester and the automated turntable of the present invention;
FIG. 7 is an elevational view (in full section) of the assembly of the loading chamber, the clamping chamber and the heating chamber of the present invention;
FIG. 8 is a front view (partially in section) of an assembly of the heater box, the interlocking clamp, the rock sample, the LVDT displacement sensor, the ram, the insulation pad and the press block of the present invention;
in the figure, 1-true triaxial tester, 2-automatic turntable, 3-CT ray source, 4-CT detector, 5-control cabinet, 6-control console, 7-gas-liquid pipeline, 8-rock sample, 9-interlocking clamp, 10-LVDT displacement sensor, 101-first large main stress actuator, 102-second large main stress actuator, 103-first middle main stress actuator, 104-second middle main stress actuator, 105-loading bin, 106-clamping bin, 107-hydraulic oil tank, 108-heating box, 109-pressure head, 110-heat insulation pad, 111-pressure block, 112-heating plate, 201-turntable bottom plate, 202-turntable box body, 203-turntable top plate, 204-turntable rotating plate, 205-rotating driving motor, 206-rotating shaft rod.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1-8, a rock true triaxial test system integrating micro CT online scanning comprises a true triaxial tester 1, an automatic turntable 2, a CT ray source 3, a CT detector 4, a control cabinet 5 and a control console 6; the true triaxial test instrument 1 is arranged on the automatic turntable 2, the true triaxial test instrument 1 is positioned between the CT ray source 3 and the CT detector 4, the true triaxial test instrument 1 is connected with the control cabinet 5 through a gas-liquid pipeline 7, and the control cabinet 6 is electrically connected with the control cabinet 5; the control cabinet 5 is used for controlling loading and unloading actions of the true triaxial tester 1; the control console 6 is used for sending control instructions to the true triaxial tester 1 and the automatic turntable 2 and storing and processing CT scanning data and images generated by the cooperation of the CT ray source 3 and the CT detector 4.
The true triaxial tester 1 comprises a first large main stress actuator 101, a second large main stress actuator 102, a first middle main stress actuator 103, a second middle main stress actuator 104, a loading bin 105, a clamping bin 106 and a hydraulic oil tank 107; the hydraulic oil tank 107 is fixedly arranged on the automatic turntable 2, the loading bin 105 is fixedly arranged at the top of the hydraulic oil tank 107, a clamping bin mounting hole is vertically formed in the center of the loading bin 105, and the clamping bin 106 is vertically and fixedly arranged in the clamping bin mounting hole of the loading bin 105; the first large main stress actuator 101 is vertically and fixedly arranged at the top of the clamping chamber 106, the second large main stress actuator 102 is vertically and fixedly arranged at the bottom of the clamping chamber 106, and the second large main stress actuator 102 is hidden in the hydraulic oil tank 107; the first middle main stress actuator 103 is horizontally and fixedly arranged at the left side part of the loading bin 105, and the second middle main stress actuator 104 is horizontally and fixedly arranged at the right side part of the loading bin 105; a heating box 108 is arranged in the center of the clamping chamber 106, loading holes are formed in the upper, lower, left and right four box walls of the heating box 108, and a pressure head 109, a heat insulation pad 110 and a pressing block 111 are respectively arranged in each loading hole from inside to outside; the first large main stress actuator 101, the second large main stress actuator 102, the first middle main stress actuator 103 and the second middle main stress actuator 104 are directly matched with the pressing blocks 111 in the corresponding loading holes in a force application manner; the heating plate 112 is arranged on the inner surface of the bottom box plate of the heating box 108, and the center of the heating box 108 is used for placing the rock sample 8.
The automatic turntable 2 comprises a turntable bottom plate 201, a turntable box 202, a turntable top plate 203, a turntable revolving plate 204, a revolving driving motor 205 and a rotating shaft rod 206; the turntable bottom plate 201 is horizontally and fixedly arranged on the ground, the turntable box body 202 is fixedly arranged on the turntable bottom plate 201, and the turntable top plate 203 is horizontally and fixedly arranged at the top of the turntable box body 202; the rotary driving motor 205 is vertically installed at the center inside the turntable box 202, a motor shaft of the rotary driving motor 205 faces upwards, the rotary shaft rod 206 vertically penetrates through the turntable top plate 203, and the lower end of the rotary shaft rod 206 is fixedly connected with the motor shaft of the rotary driving motor 205; the turntable rotating plate 204 is horizontally arranged above the turntable top plate 203, the upper end of the rotating shaft rod 206 is fixedly connected with the turntable rotating plate 204, and the turntable rotating plate 204 has a rotating degree of freedom relative to the turntable top plate 203; the hydraulic oil tank 107 is fixedly arranged on the upper surface of the turntable rotary plate 204.
The first large main stress actuator 101, the second large main stress actuator 102, the first middle main stress actuator 103, the second middle main stress actuator 104, the loading bin 105 and the clamping bin 106 are all made of polycarbonate, and the turntable bottom plate 201, the turntable box body 202, the turntable top plate 203, the turntable revolving plate 204 and the rotating shaft rod 206 are all made of rigid metal materials; the heating box 108 and the heat insulation pad 110 are both made of composite ceramics; the gas-liquid pipeline 7 adopts a flexible pipeline.
The rock sample 8 is packaged by an interlocking type clamp 9, an LVDT displacement sensor 10 for measuring the deformation of the rock sample 8 in the large main stress direction and the middle main stress direction is arranged on the interlocking type clamp 9, and the LVDT displacement sensor 10 for measuring the deformation of the rock sample 8 in the small main stress direction is arranged between the interlocking type clamp 9 and the rock sample 8; the mutual buckled clamp 9 is made of polycarbonate or high-strength aluminum alloy.
The heating box 108 adopts a combined type assembling structure, and a front side box plate and a rear side box plate of the heating box 108 are packaged and fixed by a through type through long screw rod.
A rock true triaxial test method fusing on-line scanning of micro CT adopts the rock true triaxial test system fusing on-line scanning of micro CT, which comprises the following steps:
the method comprises the following steps: packaging the prepared rock sample 8 with the size of 35mm multiplied by 70mm into an interlocking type clamp 9, simultaneously installing the LVDT displacement sensors 10 in the three main stress directions in place to finally form a combination, and then sending the combination into a true triaxial tester 1;
step two: firstly, completing the wiring connection of each sensor, and then completing the packaging of the heating box 108;
step three: adjusting the positions of the CT ray source 3 and the CT detector 4 to ensure that the CT ray source 3 and the CT detector 4 are opposite to the rock sample 8 at the center of the true triaxial tester 1;
step four: arranging the gas-liquid pipeline 7 to prevent the gas-liquid pipeline 7 from knotting when the true triaxial tester 1 rotates;
step five: turning on the power supply of the rotary driving motor 205, and simultaneously turning on the power supplies of the CT ray source 3 and the CT detector 4;
step six: firstly, controlling the true triaxial tester 1 to apply confining pressure to the rock sample 8 to a set value, then starting the heating plate 112 to enable the environmental temperature of the rock sample 8 to reach the set value, then controlling the true triaxial tester 1 to synchronously apply middle main stress and maximum main stress to the rock sample 8 to reach a middle main stress set value, and finally controlling the true triaxial tester 1 to apply axial load to the rock sample 8;
step seven: firstly, setting the rotation rate of the turntable rotary plate 204 through the control console 6, and enabling the control console 6 to give a developed starting instruction to the rotary driving motor 205 at a specified time, further enabling the rotary driving motor 205 to drive the turntable rotary plate 204 to rotate according to the set rotation rate, and driving the true triaxial tester 1 thereon to synchronously rotate, and observing the winding condition of the gas-liquid pipeline 7 during rotation;
step eight: in the rotation process of the true triaxial tester 1, a rock sample 8 at the center of the true triaxial tester 1 is scanned on line in real time through a CT ray source 3 and a CT detector 4, and scanning data is recorded and stored by a console 6;
step nine: after the true triaxial tester 1 rotates for a circle or rotates to a set angle, the rotation driving motor 205 is turned off, so that the true triaxial tester 1 stops rotating;
step ten: controlling the true triaxial tester 1 to rotate repeatedly, and continuously carrying out real-time online scanning on the rock sample 8 at the center of the true triaxial tester 1 through the CT ray source 3 and the CT detector 4 in the rotating process of the true triaxial tester 1 until the loading test of the rock sample 8 is finished;
step eleven: reversely starting the rotation driving motor 205, controlling the true triaxial tester 1 to rotate to the initial position at a set rotation rate, unloading the maximum main stress and the middle main stress, then closing the heating plate 112, unloading the confining pressure after the ambient temperature returns to the normal temperature, and finally taking out the rock sample 8;
step twelve: and image reconstruction is carried out according to the obtained scanning projection data, so that the deformation and internal crack states of the rock sample 8 at any moment or in any stress state can be obtained.
The embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention are intended to be included in the scope of the present invention.
Claims (2)
1. The utility model provides a real triaxial test system of rock that fuses microcosmic CT on-line scanning which characterized in that: the device comprises a true triaxial tester, an automatic turntable, a CT ray source, a CT detector, a control cabinet and a control console; the true triaxial test instrument is arranged on the automatic turntable, is positioned between the CT ray source and the CT detector, is connected with the control cabinet through a gas-liquid pipeline, and is electrically connected with the control cabinet; the control cabinet is used for controlling loading and unloading actions of the true triaxial tester; the control console is used for sending control instructions to the true triaxial tester and the automatic turntable and storing and processing CT scanning data and images generated by the cooperation of the CT ray source and the CT detector;
the true triaxial tester comprises a first large main stress actuator, a second large main stress actuator, a first middle main stress actuator, a second middle main stress actuator, a loading bin, a clamping bin and a hydraulic oil tank; the hydraulic oil tank is fixedly arranged on the automatic rotary table, the loading bin is fixedly arranged at the top of the hydraulic oil tank, a clamping bin mounting hole is vertically formed in the center of the loading bin, and the clamping bin is vertically and fixedly arranged in the clamping bin mounting hole of the loading bin; the first large main stress actuator is vertically and fixedly arranged at the top of the clamping chamber, the second large main stress actuator is vertically and fixedly arranged at the bottom of the clamping chamber, and the second large main stress actuator is hidden and arranged in the hydraulic oil tank; the first middle main stress actuator is horizontally and fixedly arranged at the left side part of the loading bin, and the second middle main stress actuator is horizontally and fixedly arranged at the right side part of the loading bin; a heating box is arranged in the center of the clamping bin, loading holes are formed in the wall of the heating box on the upper, lower, left and right sides, and a pressure head, a heat insulation pad and a pressing block are respectively arranged in each loading hole from inside to outside; the first large main stress actuator, the second large main stress actuator, the first middle main stress actuator and the second middle main stress actuator are directly matched with pressing blocks in the corresponding loading holes in a force application manner; the heating plate is arranged on the inner surface of a box plate at the bottom of the heating box, and the center of the heating box is used for placing a rock sample;
the automatic turntable comprises a turntable bottom plate, a turntable box body, a turntable top plate, a turntable rotating plate, a rotation driving motor and a rotating shaft rod; the turntable bottom plate is horizontally and fixedly arranged on the ground, the turntable box body is fixedly arranged on the turntable bottom plate, and the turntable top plate is horizontally and fixedly arranged at the top of the turntable box body; the rotary driving motor is vertically arranged at the center of the inner part of the rotary table box body, a motor shaft of the rotary driving motor faces upwards, the rotary shaft rod vertically penetrates through the rotary table top plate, and the lower end of the rotary shaft rod is fixedly connected with the motor shaft of the rotary driving motor; the rotary table rotating plate is horizontally arranged above the rotary table top plate, the upper end of the rotary shaft rod is fixedly connected with the rotary table rotating plate, and the rotary table rotating plate has a rotating degree of freedom relative to the rotary table top plate; the hydraulic oil tank is fixedly arranged on the upper surface of the turntable rotary plate;
the first large main stress actuator, the second large main stress actuator, the first middle main stress actuator, the second middle main stress actuator, the loading bin and the clamping bin are all made of polycarbonate, and the turntable bottom plate, the turntable box body, the turntable top plate, the turntable revolving plate and the rotating shaft rod are all made of rigid metal materials; the heating box and the heat insulation pad are both made of composite ceramics; the gas-liquid pipeline adopts a flexible pipeline;
the rock sample is packaged by an interlocking type clamp, an LVDT displacement sensor for measuring the deformation of the rock sample in the large main stress direction and the middle main stress direction is arranged on the interlocking type clamp, and an LVDT displacement sensor for measuring the deformation of the rock sample in the small main stress direction is arranged between the interlocking type clamp and the rock sample; the material of the mutually buckled clamp is polycarbonate or high-strength aluminum alloy;
the heating box adopts a combined type assembling structure, and a front side box plate and a rear side box plate of the heating box are packaged and fixed by a through type through long screw rod.
2. A rock true triaxial test method fusing on-line scanning of micro CT, which adopts the rock true triaxial test system fusing on-line scanning of micro CT as claimed in claim 1, characterized by comprising the following steps:
the method comprises the following steps: packaging the prepared rock sample into an interlocking type clamp, installing the LVDT displacement sensors in three main stress directions in place to finally form a combination, and then sending the combination into a true triaxial tester;
step two: firstly, completing the wiring connection of each sensor, and then completing the packaging of the heating box;
step three: adjusting the positions of the CT ray source and the CT detector to ensure that the CT ray source and the CT detector are opposite to the rock sample at the center of the true triaxial tester;
step four: arranging the gas-liquid pipeline to prevent the gas-liquid pipeline from knotting when the true triaxial tester rotates;
step five: switching on a power supply of a rotary driving motor, and simultaneously switching on power supplies of a CT ray source and a CT detector;
step six: firstly, controlling a true triaxial tester to apply confining pressure to a rock sample to a set value, then starting a heating plate to enable the environmental temperature of the rock sample to reach the set value, then controlling the true triaxial tester to synchronously apply middle main stress and maximum main stress to the rock sample to reach the middle main stress set value, and finally controlling the true triaxial tester to apply axial load to the rock sample;
step seven: firstly, setting the rotation rate of a turntable rotating plate through a control console, enabling the control console to give a developed starting instruction to a rotation driving motor at a specified time, further enabling the rotation driving motor to drive the turntable rotating plate to rotate according to the set rotation rate, driving a true triaxial tester thereon to synchronously rotate, and observing the winding condition of a gas-liquid pipeline during rotation;
step eight: in the rotation process of the true triaxial tester, a rock sample at the center of the true triaxial tester is scanned on line in real time through a CT ray source and a CT detector, and scanning data is recorded and stored by a console;
step nine: when the true triaxial tester rotates for a circle or rotates to a set angle, the rotation driving motor is turned off, so that the true triaxial tester stops rotating;
step ten: controlling the true triaxial tester to rotate repeatedly, and continuously carrying out real-time online scanning on the rock sample at the center of the true triaxial tester through the CT ray source and the CT detector in the rotating process of the true triaxial tester until the rock sample loading test is finished;
step eleven: reversely starting a rotation driving motor, controlling the true triaxial tester to rotate to an initial position at a set rotation rate, unloading the maximum main stress and the middle main stress, closing the heating plate, unloading confining pressure after the ambient temperature is recovered to normal temperature, and finally taking out the rock sample;
step twelve: and performing image reconstruction according to the obtained scanning projection data, and obtaining the deformation and internal crack states of the rock sample at any time or in any stress state.
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| CN202010973324.9A CN112067458B (en) | 2020-09-16 | 2020-09-16 | Rock true triaxial test system and method integrating microcosmic CT (computed tomography) online scanning |
| PCT/CN2020/117421 WO2022056944A1 (en) | 2020-09-16 | 2020-09-24 | Rock true triaxial testing system and method integrated with microscopic ct online scanning |
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| CN202010973324.9A CN112067458B (en) | 2020-09-16 | 2020-09-16 | Rock true triaxial test system and method integrating microcosmic CT (computed tomography) online scanning |
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| CN112903470B (en) * | 2021-01-18 | 2022-03-25 | 东北大学 | High-temperature seepage coupling experimental device and method based on hard rock true triaxial system |
| CN113791095B (en) * | 2021-11-18 | 2022-02-11 | 煤炭科学研究总院 | Accurate sample position adjusting method for CT scanning |
| CN114839049A (en) * | 2022-04-06 | 2022-08-02 | 珠江水利委员会珠江水利科学研究院 | Concrete and rock cement face shear failure process visualization device in-situ direct shear test |
| CN116256300B (en) * | 2023-05-08 | 2023-10-13 | 中国矿业大学(北京) | Device and method for evaluating damage of high-temperature and high-humidity gas to surrounding rock pore structure |
| CN116539414B (en) * | 2023-07-05 | 2023-08-29 | 中国科学院地质与地球物理研究所 | Rock true triaxial test system with CT (computed tomography) scanning |
| CN117168987B (en) * | 2023-11-01 | 2024-02-02 | 煤炭科学研究总院有限公司 | Loading test system |
| CN117740547B (en) * | 2024-02-19 | 2024-04-26 | 中国石油大学(华东) | Device and method for evaluating interaction between deep anisotropic stratum and wellbore fluid |
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