CN113916647A - Rock fracture shearing seepage coupling test device and test method thereof - Google Patents
Rock fracture shearing seepage coupling test device and test method thereof Download PDFInfo
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- CN113916647A CN113916647A CN202111165382.XA CN202111165382A CN113916647A CN 113916647 A CN113916647 A CN 113916647A CN 202111165382 A CN202111165382 A CN 202111165382A CN 113916647 A CN113916647 A CN 113916647A
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- 239000011435 rock Substances 0.000 title claims abstract description 96
- 238000012360 testing method Methods 0.000 title claims abstract description 40
- 238000010008 shearing Methods 0.000 title claims abstract description 33
- 230000008878 coupling Effects 0.000 title claims abstract description 32
- 238000010168 coupling process Methods 0.000 title claims abstract description 32
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 32
- 238000010998 test method Methods 0.000 title claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 74
- 238000006073 displacement reaction Methods 0.000 claims abstract description 41
- 238000001125 extrusion Methods 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000001808 coupling effect Effects 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 12
- 239000010438 granite Substances 0.000 description 10
- 239000004809 Teflon Substances 0.000 description 5
- 229920006362 Teflon® Polymers 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000009434 installation Methods 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
- 239000000243 solution 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
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for 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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
Abstract
The invention relates to a rock fracture shearing seepage coupling test device and a test method thereof, belonging to the technical field of rock mechanics, wherein the device comprises a pressure chamber, an integrated flexible tubular body, a first pressure head and a second pressure head, wherein the first pressure head and the second pressure head are arranged at two ends of the flexible tubular body; the flexible tubulose body is placed in the pressure chamber, is equipped with the normal direction displacement sensor who detects the flexible tubulose body axis direction of perpendicular to in the pressure chamber, and the inside rock crack sample that is used for placing of flexible tubulose body, and the pressure head at flexible tubulose body both ends can be relative motion extrusion rock crack sample at its axis direction to produce the shearing force in inside, be equipped with water inlet channel in the first pressure head, be equipped with out the water passageway in the second pressure head. Can guarantee through the device that rock sample is shearing the invariable of direction under the coupling effect of cuting, have good seepage flow seal effect, can realize the displacement detection to rock sample normal direction simultaneously.
Description
Technical Field
The invention belongs to the technical field of rock mechanics, and particularly relates to a rock fracture shear seepage coupling test device and a test method thereof.
Background
With the increasing deep rock engineering in China, the faced engineering geological problems are more and more complex and comprise the difficult problems of active faults, high ground stress, high groundwater and the like, the rock mass consists of rock blocks and cracks, the cracks are main water guide channels, and shear slip instability of the rock mass under the action of hydraulic coupling usually can cause serious geological disasters, so that the deep research on the shear-seepage coupling characteristic of the rock mass and the instability rule caused by the shear slip instability characteristic have a vital role in ensuring the safety and stability of the underground rock engineering, and the rock crack shear seepage coupling test is the most direct and effective means for researching the hydraulic characteristic of the rock cracks.
At present, the devices and methods related to shear seepage coupling mainly have the following disadvantages: adopt the direct shear box to cut the seepage flow test, nevertheless because the upper and lower shearing box body of direct shear box is difficult to guarantee the invariant of shearing direction at the shearing in-process that slides, lead to sealed difficulty in the seepage flow test process, and adopt the shearing seepage flow test under the conventional triaxial pressure chamber structure, because the restriction of pressure chamber structure, only can realize detecting the displacement of the axis direction of rock sample, can't realize detecting the normal direction displacement of perpendicular to rock sample axis.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a rock fracture shearing seepage coupling test device and a test method thereof, which can ensure the constant shearing direction of a rock sample under the action of shearing seepage coupling, have good sealing capability and can realize displacement detection of the rock sample in the normal direction.
The embodiment of the invention provides a rock fracture shearing seepage test device which comprises a pressure chamber, an integrated flexible tubular body, a first pressure head and a second pressure head, wherein the first pressure head and the second pressure head are arranged at two ends of the flexible tubular body;
the flexible tubulose body is placed in the pressure chamber, is equipped with the normal direction displacement sensor who detects the flexible tubulose body axis direction of perpendicular to in the pressure chamber, and the inside rock crack sample that is used for placing of flexible tubulose body, and the pressure head at flexible tubulose body both ends can be relative motion extrusion rock crack sample at its axis direction to produce the shearing force in inside, be equipped with water inlet channel in the first pressure head, be equipped with out the water passageway in the second pressure head.
Furthermore, two ends of the flexible tubular body are hermetically connected with the pressure chamber, an annular sealing cavity is formed between the outer wall surface of the flexible tubular body and the pressure chamber, an oil inlet and an oil outlet are arranged on the pressure chamber, and the oil inlet and the oil outlet are communicated with the annular sealing cavity.
Further, the normal displacement sensor comprises an upper normal displacement meter and a lower normal displacement meter, wherein the upper normal displacement meter and the lower normal displacement meter are arranged in the annular sealing cavity.
Furthermore, sealing rings are arranged between the two ends of the flexible tubular body and the pressure chamber, a pressing ring is arranged outside the flexible tubular body and fixed on the pressure chamber through a pin shaft, and a locking nut is arranged outside the pressing ring and connected with the pressure chamber through threads.
Furthermore, the end part of the first pressure head, which is contacted with the rock fracture sample, is provided with a first annular seepage groove, the first annular seepage groove is communicated with the water inlet channel, the end part of the second pressure head, which is contacted with the rock fracture sample, is provided with a second annular seepage groove, and the second annular seepage groove is communicated with the water outlet channel.
Further, the ends, contacted with the rock fracture sample, of the first pressure head and the second pressure head are divided into a first semi-cylindrical rigid bulge and a second semi-cylindrical rigid bulge, the first semi-cylindrical rigid bulge is integrally arranged with the pressure head body, the second semi-cylindrical rigid bulge can move along the axial direction of the pressure head, and the first semi-cylindrical rigid bulge and the second semi-cylindrical rigid bulge are symmetrical about the center of the sample to be measured.
Furthermore, a polytetrafluoroethylene semi-cylinder is arranged between the second semi-cylinder rigid bulge and the pressure head body.
Furthermore, a water inlet communicated with the water inlet channel is arranged on the first pressure head, a water outlet communicated with the water outlet channel is arranged on the second pressure head, the water inlet is connected with a water inlet pipeline, the water outlet is connected with a water outlet pipeline, and the water inlet pipeline and the water outlet pipeline are connected with a flow meter and a liquid pressure meter.
Furthermore, a pressure sensor is arranged on the first pressure head and can move along the axial direction of the flexible tubular body, and the second pressure head is fixed.
The embodiment of the invention also provides a test method of the rock fracture shear seepage coupling test device based on any one of the above, which comprises the following steps:
placing the rock fracture sample to be detected in the flexible tubular body, so that two ends of the rock fracture sample are respectively contacted with the second pressure head and the first pressure head;
the first pressure head and the second pressure head are controlled to move relatively to extrude the rock fracture sample, so that shearing force is generated inside the rock fracture sample to be tested, water is injected into the water inlet channel in the first pressure head, water flows out of the water outlet channel in the second pressure head through the rock fracture sample to be tested, the rock sample shearing seepage coupling test is realized, and the change of the normal displacement sensor is observed.
The invention has the following beneficial effects:
according to the shear seepage coupling test device provided by the invention, a rock sample to be tested is placed in the flexible tubular body, and axial direction force is applied to the rock sample through the pressure heads at the two ends of the flexible tubular body, so that shear force is generated in the rock sample to be tested, and meanwhile, water is injected into the rock sample through the pressure heads at the two ends to complete a shear seepage coupling test.
Drawings
FIG. 1 is an overall structure diagram of a rock fracture shear seepage coupling test device provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of the interior of a triaxial cell in the coupling test apparatus according to an embodiment of the present invention;
FIG. 3 is a block diagram of a confining pressure loading system connected to a triaxial cell according to an embodiment of the present invention;
FIG. 4 is a block diagram of a seepage control system coupled to a triaxial cell according to an embodiment of the present invention;
FIG. 5 is a block diagram of a first ram in a coupling testing apparatus according to an embodiment of the present invention;
fig. 6 is a schematic view of an axial loading system according to an embodiment of the present invention.
In the figure: 10. a triaxial pressure chamber, 101, an upper normal displacement meter, 102, a lower normal displacement meter, 103, an annular sealing cavity, 104, a pressing ring, 105, a locking nut, 106, an adjusting cover, 107, an oil filling port, 108, a confining pressure loading computer control end, 109, an oil outlet, 110, an oil collecting tank, 111, a cylindrical pin, 112, a limiting block, 113, an O-shaped sealing ring, 20, a second pressure head, 201, a left water guide channel, 202, a left water outlet, 203, a second fluid pressure meter, 204, a second flow meter, 205, a fluid collector, 30, a first pressure head, 301, a right water guide channel, 302, a right water inlet, 303, a first fluid pressure meter, 304, a first flow meter, 305, a seepage control system, 306, a transparent Teflon heat shrink tube, 307, a sample, 308, a second semi-cylinder, 309, a first semi-cylinder, 310, a circular groove, granite, a water gap, 312, an axial pressure sensor, 313. The device comprises an annular shaft shoulder, 314, a special joint, 315, a polytetrafluoroethylene semi-cylinder, 316, an axial loading computer control end, 40, a flexible tubular body, 50, an axial fixing device, 60, an axial propelling device, 70 and a reaction frame.
Detailed Description
Referring to fig. 1-2, the rock fracture shear seepage coupling test device according to the embodiment of the invention mainly comprises a triaxial pressure chamber 10, and a second pressure head 20 and a first pressure head 30 connected to the triaxial pressure chamber 10, wherein the second pressure head 20 is fixed on a reaction frame 70 through an axial fixing device 50, and the first pressure head 30 is connected to an axial propelling device 60 and can be brought to the first pressure head 30 through the axial propelling device 60 to move in a direction close to the second pressure head 20.
Be equipped with the flexible siphonozooid 40 that the level was placed in the triaxial pressure chamber 10, wherein the inside of flexible siphonozooid 40 is used for placing the rock sample that awaits measuring, wherein the shape of rock sample that awaits measuring is cylindrical, the both ends at flexible siphonozooid 40 are installed respectively to second pressure head 20 and first pressure head 30, and second pressure head 20 and first pressure head 30 all go deep into the inside of flexible siphonozooid 40, second pressure head 20 is connected with the one end of rock sample that awaits measuring, first pressure head 30 is connected with the other end of rock sample that awaits measuring, when second pressure head 20 removes along axial direction, through the extrusion of second pressure head 20 and first pressure head 30 to rock sample spare that awaits measuring, the inside shearing force that can produce of rock sample that awaits measuring.
Further, an upper normal displacement meter 101 and a lower normal displacement meter 102 are arranged on the upper side and the lower side of the flexible tubular body 40 of the pressure chamber, and both the two normal displacement meters are in contact with the surface of the flexible tubular body 40 and are used for detecting the normal displacement of the rock sample during the rock shear seepage test.
Therefore, the shearing seepage coupling test device that this embodiment provided, place the rock sample that awaits measuring in flexible tubulose body 40, the pressure head through flexible tubulose body 40 both ends exerts axial direction power for the rock sample, thereby at the inside shearing force that produces of rock sample that awaits measuring, accomplish shearing seepage coupling test to the inside water injection of rock sample through second pressure head 20 and first pressure head 30 simultaneously, compare in present direct shear box, the box body slides in the shearing down-cut, the device can guarantee the invariant of shearing direction through flexible tubulose body 40, improve the leakproofness when measuring accuracy and sample seepage, be equipped with the normal displacement sensor in the inside of pressure chamber simultaneously and can detect the normal displacement of the rock fracture in the shearing seepage test process.
Specifically, referring to fig. 2, in the present embodiment, a central through hole with left and right ports is formed inside the pressure chamber, wherein the flexible tubular body 40 is installed in the center of the central through hole, the inner diameter of the flexible tubular body 40 is smaller than that of the central through hole, and two ends of the flexible tubular body 40 are hermetically connected to side walls of two ends of the pressure chamber.
An annular sealing cavity 103 or a confining pressure cavity is formed between the outer wall surface of the flexible tubular body 40 and the inner wall of the central through hole of the pressure chamber, referring to fig. 4, an oil filling port 107 and an oil outlet 109 are arranged on the pressure chamber, the oil filling port 107 and the oil outlet 109 are both communicated with the annular sealing cavity 103, wherein the oil filling port 107 is connected with a confining pressure loading computer control end 108 through an oil inlet pipeline, the oil outlet 109 is connected with an oil collecting tank 110 through an oil discharge pipeline, so that confining pressure oil can be injected through the oil filling port 107 on the pressure chamber, and the confining pressure oil finally flows into the oil collecting tank 110 for storage through the annular sealing cavity 103 and the oil outlet 109.
Thus, confining pressure oil is injected into a confining pressure cavity of the pressure chamber through the oil injection port 107, confining pressure application to the flexible tubular body 40 for fixing the rock fracture sample is achieved, a specific confining pressure value is obtained at a confining pressure loading computer control end 108, and due to the fact that the applied confining pressure is generally larger than seepage pressure, the sealing effect of preventing seepage fluid from flowing out of the side edge of the rock fracture sample can be achieved.
Referring to fig. 2, in the present embodiment, the upper normal displacement meter 101 is installed at the upper portion of the pressure chamber and extends into the annular sealing cavity 103 to contact with the outer surface of the flexible tubular body 40, and the lower normal displacement meter 102 is installed at the lower portion of the pressure chamber and extends into the annular sealing cavity 103 to contact with the outer surface of the flexible tubular body 40, so that the normal displacement of the rock fracture sample in the shear seepage process can be detected at any time.
In order to avoid the flexible tubular body 40 from affecting the accuracy of the test, the flexible tubular body 40 in this embodiment has good sealing and deformability.
Further, referring to fig. 3, in the present embodiment, a right water inlet 302 is disposed on the first pressure head 30, and a right water channel 301 is disposed in the first pressure head 30, and the right water channel 301 is communicated with the right water inlet 302 through a right cavity; the second pressure head 20 is provided with a left water outlet 202, a left water guide channel 201 is arranged inside the second pressure head 20, and the left water guide channel 201 is connected with the left water outlet 202 through a left cavity.
The right water inlet 302 is connected with a seepage control system 305 through a water inlet pipeline, the water inlet pipeline is connected with a first flow meter 304 and a first fluid pressure meter 303 for measuring and recording seepage pressure values and seepage flow of an injection end, the left water outlet 202 is connected with a fluid collector 205 through a water outlet pipeline, and the water outlet pipeline is provided with a second flow meter 204 and a second fluid pressure meter 203 for measuring and recording seepage pressure values and seepage flow of an outflow end.
While the second ram 20 and the first ram 30 are pressing against the rock fracture sample, water may be injected into the first ram 30 through the water inlet line, then through the inflow rock fracture sample, and finally out through the water outlet 202 of the second ram 20 and then into the fluid collector 205, thus completing the seepage test.
In order to ensure the sealing performance of the flexible tubular body 40, referring to fig. 2, in the embodiment, two ends of the flexible tubular body 40 form a circular disk to be abutted to end surfaces of two sides of the pressure chamber, and the circular disks of the two sides and the end surfaces of two sides of the pressure chamber are connected in a sealing manner through an O-shaped rubber ring 113, so that liquid is ensured not to flow out from a gap between the two.
Furthermore, the outer sides of the two ends of the flexible tubular body 40 are respectively provided with a pressing ring 104, the two ends of the flexible tubular body 40 are tightly pressed on the end surfaces of the two sides of the pressure chamber by the pressing ring 104 and are fixed on the end surfaces of the two sides of the pressure chamber through a cylindrical pin 111, meanwhile, the outer side of the pressing ring 104 is also provided with a locking nut 105, the locking nut 105 is in threaded connection with the two ends of the pressure chamber, when the locking nut 105 is screwed on the pressure chamber, the locking nut 105 is in contact with the pressing ring 104, so that the pressing ring 104 can be used for giving an axial force to the pressing ring 104 through the locking nut 105, the pressing ring 104 can be used for ensuring that the flexible tubular body 40 can be tightly fixed on the end surfaces of the two ends of the pressure chamber, and the overall sealing performance is improved.
In this embodiment, the second ram 20 and the first ram 30 are mainly composed of cylinder structures with different diameters at two ends, and an annular shoulder 313 is disposed between the two cylinder structures with different diameters, wherein the annular shoulder 313 of the second ram 20 can contact with an inner wall of the lock nut 105, and an adjusting cover 106 is connected to an outer side of the lock nut 105 for fixing the first ram 30, the adjusting cover 106 is connected to the right lock nut 105 through a thread, and an inner portion of the adjusting cover 106 contacts with the shoulder of the first ram 30 through the limiting block 112, so that the second ram 20 and the first ram 30 are fixed.
Referring to fig. 5, in order to enable the second indenter 20 and the first indenter 30 to generate a shear force inside the rock fracture sample when the rock fracture sample is pressed, wherein the first indenter 30 is a cylinder, and the end of the first indenter 30 is divided into three parts, namely, a first semi-cylinder 309 and a second semi-cylinder 308, and a teflon semi-cylinder 315, wherein the thickness or height of the first semi-cylinder 309 is greater than that of the second semi-cylinder 308, the first semi-cylinder 309 is integrally formed with the first indenter 30, and the second indenter 20 is also constructed in such a way, except that the first semi-cylinder 309 of the second indenter 20 and the first semi-cylinder 309 of the first indenter 30 are symmetrical with respect to the center of the rock fracture sample, that is, if the first semi-cylinder 309 of the first indenter 30 is located at the upper part, the first semi-cylinder 309 of the second indenter 20 is located at the lower part, this ensures that the second ram 20 and the first ram 30 are pressed against each other and that horizontal shear forces are generated within the rock sample.
Further, the second half cylinders 308 of the first pressing head 30 and the second pressing head 20 in this embodiment are slidably disposed on the pressing head body, and a teflon half cylinder 315 is disposed between the pressing head body and the second half cylinders 308, so that when the rock fracture sample is sheared and deformed, the teflon half cylinders 315 can be pressed by the second half cylinders 308, and thus, a certain shearing and deformation space for the rock fracture sample can be provided.
It should be noted that the first semi-cylinder 309 and the second semi-cylinder 308 of the second indenter 20 and the first indenter 30 are made of rigid materials, so as to ensure that the contact end surfaces of the indenters and the rock sample are flat.
Referring to fig. 5, in the embodiment, a plurality of concentric circular grooves 310 are formed in an end surface of the first ram 30, the circular grooves 310 are communicated with each other, a water gap 311 is formed in the end surface of the first ram 30, the water gap 311 is communicated with the right water guide channel 301 inside the ram, the water gap 311 is formed in the first semi-cylinder 309, and one circular groove 310 is communicated with each other, so that water flowing out of the first ram 30 can uniformly enter the inside of the rock sample, and the same circular groove 310 is also formed in the second ram 20.
Since the end of the ram is divided into a first half cylinder 309 and a second half cylinder 308 in this embodiment, each circular groove 310 in the end of the ram is also divided into two sections.
Further, in the present embodiment, the inside of the first ram 30 is further provided with an axial pressure sensor 312, by which the axially applied load can be recorded, and meanwhile, the axial pressure sensor 312 is placed inside the first ram 30, so that the rock shear strength can be measured more accurately.
Referring to fig. 6, the second pressure head 20 in the embodiment is fixed on the counterforce frame through a left axial fixing device 50, the first pressure head 30 is connected with an axial propelling device 60 and a special joint 314, the axial propelling device 60 is connected with an axial displacement meter, wherein the axial displacement meter and the normal displacement meter form a displacement measuring system for detecting the displacement condition of the rock sample in the shear seepage test process.
Meanwhile, the first pressing head 30 is connected with an axial loading computer control end 316 through a special connector 314, and the load applied by the first pressing head 30 is controlled through the axial loading computer control end.
The following describes in detail a test method based on the rock fracture shear seepage coupling test device:
the method comprises the following steps: installing the rock fracture sample, forming the second ram 20, the granite sample 307 and the first ram 30 into an assembled body;
specifically, in this step, first, a standard cylindrical granite sample of 50 × 100mm is processed; secondly, splitting the granite sample by using Brazilian splitting test equipment to form a horizontal crack surface parallel to the end surface and obtain a granite crack sample; finally, assembling the second pressure head 20, the granite sample 307, the first pressure head 30 and the transparent Teflon heat-shrinkable tube 306 together to form a combined body, and ensuring that the protruding plane of the shearing pressure head main body and the rock crack surface are in the same level;
step two: installing the flexible tubular body 40 within the pressure chamber while the combination is installed within the flexible tubular body 40;
specifically, in this step, the flexible tubular body 40 is installed in the triaxial pressure chamber 10, and the upper normal displacement meter 101, the lower normal displacement meter 102, the triaxial pressure chamber 10 body and the flexible tubular body 40 together form a confining pressure cavity, and at the same time, confining pressure oil is separated from the rock fracture sample; the combination body is arranged in the flexible tubular body 40 from right to left, and the two ends of the flexible tubular body 40 are tightly fixed on the end faces of the two ends of the pressure chamber by using a locking nut 105 and a pressure ring 104 to realize integral sealing; meanwhile, the position of the assembly is finely adjusted through the installed adjusting cover 106, so that the accurate installation position of the sample is ensured;
step three: starting to realize a rock sample shearing seepage coupling test;
specifically, in this step, the test operation is as follows: through a confining pressure loading system, confining pressure oil is injected into a confining pressure cavity through an oil injection port 107, so that confining pressure of a granite fracture sample is applied, a specific confining pressure value is obtained at a confining pressure loading computer control end 108, and the confining pressure is kept unchanged after the specific confining pressure value is loaded to a target confining pressure value; the seepage fluid is injected through a first flow meter 304, a first fluid pressure meter 303, a water inlet pipeline and a right water inlet 302 by a seepage control system 305, then flows into a granite fissure sample through a first pressure head 30, a right water guide channel 301 and a water gap 311, flows out to a fluid collector 205 through the water gap 311, a left water guide channel 301, a second pressure head 20, a left water outlet 202, a water outlet pipeline, a second fluid pressure meter 203 and a second flow meter 204, and reaches a target seepage pressure value;
applying an axial load to the granite crack sample through an axial loading device; the axially applied load is recorded by an axial pressure sensor 312 integrated into the first ram 30, and the axial shear displacement is recorded by an axial displacement sensor; the normal displacement change of the granite fracture sample in the shearing seepage process is accurately measured through a normal displacement sensor, and the seepage flow and the seepage pressure change in the shearing process are calculated through a pressure gauge and a flow meter in the seepage control system 305.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. A rock fracture shear seepage test device is characterized by comprising a pressure chamber, an integrated flexible tubular body, a first pressure head and a second pressure head, wherein the first pressure head and the second pressure head are arranged at two ends of the flexible tubular body;
the flexible tubulose body is placed in the pressure chamber, is equipped with the normal direction displacement sensor who detects the flexible tubulose body axis direction of perpendicular to in the pressure chamber, and the inside rock crack sample that is used for placing of flexible tubulose body, and the pressure head at flexible tubulose body both ends can be relative motion extrusion rock crack sample at its axis direction to produce the shearing force in inside, be equipped with water inlet channel in the first pressure head, be equipped with out the water passageway in the second pressure head.
2. The rock fracture shearing and seepage coupling test device as claimed in claim 1, wherein two ends of the flexible tubular body are hermetically connected with the pressure chamber, an annular seal cavity is formed between the outer wall surface of the flexible tubular body and the pressure chamber, the pressure chamber is provided with an oil inlet and an oil outlet, and the oil inlet and the oil outlet are both communicated with the annular seal cavity.
3. The rock fracture shear-seepage coupling test device of claim 2, wherein the normal displacement sensor comprises an upper normal displacement gauge and a lower normal displacement gauge, wherein the upper normal displacement gauge and the lower normal displacement gauge are disposed in the annular seal cavity.
4. The rock fracture shearing seepage coupling test device as claimed in claim 2, wherein sealing rings are arranged between two ends of the flexible tubular body and the pressure chamber, a pressing ring is arranged outside the flexible tubular body, the pressing ring is fixed on the pressure chamber through a pin shaft, a locking nut is arranged outside the pressing ring, and the locking nut is in threaded connection with the pressure chamber.
5. The rock fracture shear-seepage coupling test device of claim 1, wherein the end of the first pressure head in contact with the rock fracture sample is provided with a first annular seepage groove, the first annular seepage groove is communicated with the water inlet channel, the end of the second pressure head in contact with the rock fracture sample is provided with a second annular seepage groove, and the second annular seepage groove is communicated with the water outlet channel.
6. The rock fracture shear-seepage coupling test device of claim 1, wherein the ends of the first and second indenters that contact the rock fracture sample are each divided into a first semi-cylindrical rigid protrusion that is integrally provided with the indenter body and a second semi-cylindrical rigid protrusion that is movable in the direction of the axis of the indenter, the first semi-cylindrical rigid protrusion and the second semi-cylindrical rigid protrusion being symmetrical about the center of the sample to be tested.
7. The rock fracture shear-seepage coupling test device of claim 6, wherein a polytetrafluoroethylene semi-cylinder is arranged between the second semi-cylindrical rigid protrusion and the indenter body.
8. The rock fracture shear seepage coupling test device of claim 1, wherein the first pressure head is provided with a water inlet communicated with the water inlet channel, the second pressure head is provided with a water outlet communicated with the water outlet channel, the water inlet is connected with the water inlet pipeline, the water outlet is connected with the water outlet pipeline, and the water inlet pipeline and the water outlet pipeline are connected with the flow meter and the liquid pressure meter.
9. The rock fracture shear-seepage coupling test device of claim 1, wherein the first pressure head is provided with a pressure sensor and can move along the axial direction of the flexible tubular body, and the second pressure head is fixed.
10. The test method of the rock fracture shear-seepage coupling test device based on any one of claims 1-9 is characterized by comprising the following processes:
placing the rock fracture sample to be detected in the flexible tubular body, so that two ends of the rock fracture sample are respectively contacted with the second pressure head and the first pressure head;
the first pressure head and the second pressure head are controlled to move relatively to extrude the rock fracture sample, so that shearing force is generated inside the rock fracture sample to be tested, water is injected into the water inlet channel in the first pressure head, water flows out of the water outlet channel in the second pressure head through the rock fracture sample to be tested, the rock sample shearing seepage coupling test is realized, and the change of the normal displacement sensor is observed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111165382.XA CN113916647B (en) | 2021-09-30 | 2021-09-30 | Rock fracture shear seepage coupling test device and test method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111165382.XA CN113916647B (en) | 2021-09-30 | 2021-09-30 | Rock fracture shear seepage coupling test device and test method thereof |
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| Publication Number | Publication Date |
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| CN113916647A true CN113916647A (en) | 2022-01-11 |
| CN113916647B CN113916647B (en) | 2023-07-28 |
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Effective date of registration: 20240409 Address after: Room 907, block a, plot C-3, Greenland central square, Huaiyin District, Jinan City, Shandong Province Patentee after: Jinan mineral rock test instrument Co.,Ltd. Country or region after: China Address before: 250061, No. ten, No. 17923, Lixia District, Ji'nan City, Shandong Province Patentee before: SHANDONG University Country or region before: China |