CN112557280B - Solid-liquid coupling experimental device and experimental method - Google Patents
Solid-liquid coupling experimental device and experimental method Download PDFInfo
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- 239000007788 liquid Substances 0.000 title claims abstract description 129
- 230000008878 coupling Effects 0.000 title claims abstract description 37
- 238000010168 coupling process Methods 0.000 title claims abstract description 37
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 37
- 238000002474 experimental method Methods 0.000 title claims abstract description 21
- 239000003245 coal Substances 0.000 claims abstract description 42
- 238000012360 testing method Methods 0.000 claims abstract description 27
- 239000011435 rock Substances 0.000 claims abstract description 10
- 238000005192 partition Methods 0.000 claims description 22
- 238000007789 sealing Methods 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 230000008859 change Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 238000005498 polishing Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000004088 simulation Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 230000001808 coupling effect Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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Abstract
The invention provides a solid-liquid coupling experimental device and an experimental method, wherein the experimental device mainly comprises a left loading base frame, a right loading base frame, a front loading base frame, a rear loading base frame and a solid-liquid integrated loading device; the solid-liquid integrated loading device is fixed on the side surface and the bottom surface of the left loading base frame, the side surface and the upper surface of the right loading base frame, the front loading base frame and the rear loading base frame in a clamping groove limiting mode; the left loading foundation frame and the right loading foundation frame are fixedly connected through bolts, the front loading foundation frame is fixedly connected with the left loading foundation frame and the right loading foundation frame through bolts, and the rear loading foundation frame is fixedly connected with the left loading foundation frame and the right loading foundation frame through bolts. By adopting the solid-liquid coupling experimental device, loading and unloading experiments of different loads can be carried out on different areas of a coal body or rock body test piece, and complex stress field and seepage field environments in engineering practice can be well simulated.
Description
Technical Field
The invention belongs to the field of solid-liquid coupling experiments, and particularly relates to a solid-liquid coupling experiment device and an experiment method suitable for coal bodies and rock masses.
Background
The coal seam mining causes the damage of the overlying aquifer, and according to incomplete statistics, every 1t of coal mined in China generates about 2t of mine water. In order to fully utilize water resources of a mine underground, a trabecular Chigzhao warzky proposes to establish an underground reservoir by utilizing a goaf under the coal mine and utilize a working face to protect a coal pillar as a dam body of the underground reservoir. The pillar dam body of the coal mine underground reservoir is not only influenced by the action of mine pressure, but also influenced by the action of circulating water injection and drainage of the underground reservoir, and belongs to the coupling action of a complex stress field and a seepage field.
In order to research the change characteristics of the strength, permeability and the like of the coal pillar dam under the multiple stress coupling action of mine pressure, mine water permeability pressure and the like, research and development of a solid-liquid coupling experimental device and an experimental method are urgently needed. Aiming at a solid-liquid coupling test method and a test device, a solid-liquid coupling servo pressurization type variable water head generating device and a test method (ZL201810547708.7) thereof are provided by river and sea university, the patent mainly realizes servo control on water head pressure change, but is difficult to realize a complicated loading and unloading change process of a coal pillar dam body; the Chinese mining university provides a three-dimensional solid-liquid coupling analog simulation system and a three-dimensional solid-liquid coupling analog simulation method (ZL201910567055.3) for coal seam excavation, and the device mainly simulates the process of damaging an overlying water-bearing layer caused by coal seam excavation and is difficult to be suitable for the research of a coal pillar dam body of an underground reservoir; the North China science and technology institute provides a simulation box (ZL201720062903.1) for a three-dimensional solid-liquid coupling analog simulation experiment, which is mainly used for improving the waterproofness and is difficult to simulate the influence of water pressure and mine pressure change on a test piece in a box body; the elmin institute has proposed a simulator (ZL201922016594.6) for solid-liquid coupling physical similar materials, which mainly realizes automatic adjustment of aquifer water supply pressure, but is difficult to realize complex three-way loading and unloading processes.
The existing solid-liquid coupling simulation experiment table mainly focuses on the traditional similar simulation experiment, and is difficult to freely adjust the stress and the osmotic pressure of a test piece; the traditional laboratory true triaxial seepage test device is difficult to realize the adjustment of different mining stress and seepage pressure to different areas of a test piece, and can not meet the requirement of experimental simulation on the complex stress and seepage pressure change process of a coal mine underground reservoir coal pillar dam body.
Disclosure of Invention
Based on the problems, the invention provides a solid-liquid coupling experimental device and an experimental method, and solves the problem that the existing solid-liquid coupling experimental device is difficult to simulate the regional complicated stress and water seepage pressure change process of a test piece.
The invention provides a solid-liquid coupling experimental device, which comprises: the device comprises a left loading base frame, a right loading base frame, a front loading base frame, a rear loading base frame and a solid-liquid integrated loading device;
the left loading base frame and the right loading base frame have the same structure, and the front loading base frame and the rear loading base frame have the same structure;
the solid-liquid integrated loading device is fixed on the side surface and the bottom surface of the left loading base frame, the side surface and the upper surface of the right loading base frame, the front loading base frame and the rear loading base frame in a clamping groove limiting mode;
the left loading foundation frame and the right loading foundation frame are fixedly connected through bolts, the front loading foundation frame is fixedly connected with the left loading foundation frame and the right loading foundation frame through bolts, and the rear loading foundation frame is fixedly connected with the left loading foundation frame and the right loading foundation frame through bolts.
Further, the left loading base frame comprises a top supporting partition plate, an upper supporting partition plate, a lower supporting partition plate, a bottom supporting partition plate, a left supporting vertical plate, a middle supporting vertical plate, a right supporting vertical plate, a supporting end plate, a vertical plate supporting cross beam, an inclined supporting reinforcing plate and a supporting bottom beam;
a lateral loading device fixing clamping groove is formed in the middle supporting vertical plate, and a vertical loading device fixing clamping groove is formed in the lower supporting partition plate and used for limiting the solid-liquid integrated loading device;
the middle supporting vertical plate and the right supporting vertical plate are provided with a lateral loading frame connecting hole;
the supporting end plate is provided with an end loading base frame connecting hole which is used for being connected and fixed with the front end loading base frame and the rear end loading base frame;
the top supporting baffle plate, the upper supporting baffle plate, the lower supporting baffle plate and the bottom supporting baffle plate are respectively and fixedly connected with the left supporting vertical plate, the middle supporting vertical plate and the supporting end plate;
the right supporting vertical plate is fixedly connected with the supporting end plate and the bottom supporting partition plate respectively;
the vertical plate supporting cross beam is respectively and fixedly connected with the left supporting vertical plate and the middle supporting vertical plate;
the supporting bottom beam is respectively and fixedly connected with the middle supporting vertical plate and the right supporting vertical plate, is used for improving the rigidity of the middle supporting vertical plate and the right supporting vertical plate and simultaneously provides support for the solid-liquid integrated loading device;
furthermore, the front loading base frame comprises a base frame bearing plate and a base frame fixing plate;
the base frame bearing plate is fixedly connected with the base frame fixing plate, and an end loading device fixing clamping groove is arranged on the base frame bearing plate and used for limiting the solid-liquid integrated loading device;
and the foundation frame fixing plate is provided with a foundation frame fixing connecting hole for connecting and fixing the foundation frame with the left loading foundation frame and the right loading foundation frame.
Still further, the integrative loading device of solid-liquid includes high-pressure liquid inlet hole post, pressure loading board, stress application piece, seepage pressure application piece.
Further, the stress applying member includes a pressurizing hole column, a pressurizing plate;
the pressurizing plate is of a hollow structure;
the external diameter of the pressurizing hole column is the same as the internal diameter of the high-pressure liquid inlet hole column, and the pressurizing hole column is effectively sealed through a sealing ring and is arranged in the high-pressure liquid inlet hole column.
Furthermore, the seepage pressure applying piece comprises a seepage pressurizing hole column, a seepage pressurizing plate and a seepage hole;
the seepage pressurization plate is of a hollow structure;
the outer diameter of the seepage pressurization hole column is the same as the inner diameter of the high-pressure liquid inlet hole column, effective sealing is carried out through the sealing ring, and the seepage pressurization hole column is arranged in the high-pressure liquid inlet hole column.
The technical scheme of the invention also provides a method for carrying out a solid-liquid coupling experiment on a coal test piece or a rock test piece by using the solid-liquid coupling experiment device, which comprises the following steps:
s001, cutting and polishing the coal sample collected on site according to the size requirement of the solid-liquid coupling loading and unloading experimental device, so that the overall size and the surface flatness of the coal sample test piece meet the experimental requirement;
s002, placing a plurality of solid-liquid integrated loading devices on a lateral loading device fixing clamping groove and a vertical loading device fixing clamping groove of the left loading base frame;
s003, placing the processed and polished coal body test piece on a left loading foundation frame, placing a plurality of solid-liquid integrated loading devices on a lateral loading device fixing clamping groove and a vertical loading device fixing clamping groove of the right loading foundation frame, sealing the clamping groove positions and joints by adopting sealing strips, and connecting and fixing the left loading foundation frame and the right loading foundation frame by utilizing bolts;
s004, respectively placing the solid-liquid integrated loading device into fixing clamping grooves of end loading devices of a front-end loading base frame and a rear-end loading base frame, sealing the positions and joints of the clamping grooves by adopting sealing strips, and connecting and fixing the front-end loading base frame and the rear-end loading base frame with a left-side loading base frame and a right-side loading base frame by utilizing bolts;
s005, injecting high-pressure liquid into a stress applying piece of the solid-liquid integrated loading device, injecting different liquid pressure values into different stress applying pieces according to experimental requirements, simulating that different positions of the coal pillar dam body are subjected to different mine pressures, adjusting the pressure values of the injected liquid according to the actual mine pressure change rule, and simulating a complex stress field of the coal pillar dam body;
s006, keeping the stress field unchanged, and injecting high-pressure liquid into a seepage pressure applying piece of the solid-liquid integrated loading device, wherein the coal pillar dam body generally only bears single-side water pressure, so that the high-pressure liquid can be injected into the seepage pressure applying piece of the solid-liquid integrated loading device on the left loading base frame or the right loading base frame, and the liquid with different pressures can be injected into the seepage pressure applying pieces in different regions according to experimental requirements to simulate the change of the water pressure value in the underground reservoir;
and S007, after the experiment is finished, sequentially removing the front end loading base frame, the rear end loading base frame, the right side loading base frame, the left side loading base frame and the solid-liquid integrated loading device.
Drawings
FIG. 1 is a structural diagram of a solid-liquid coupling experimental apparatus provided in an embodiment of the present invention;
FIG. 2 is a top view of a solid-liquid coupling experimental apparatus provided in an embodiment of the present invention;
FIG. 3 is a front view of a solid-liquid coupling experimental apparatus provided in an embodiment of the present invention;
FIG. 4 is a side view of a solid-liquid coupling experimental apparatus provided in an embodiment of the present invention;
FIG. 5 is a first block diagram of a left side loading base frame;
FIG. 6 is a second block diagram of the left load base;
FIG. 7 is a schematic view of a connection structure of a left loading base frame and a right loading base frame;
FIG. 8 is a schematic structural view of a front loading base frame;
FIG. 9 is a front view of the front loading base frame;
FIG. 10 is a schematic structural diagram of a solid-liquid integrated loading device;
FIG. 11 is a view showing the structure of a stress applying member;
FIG. 12 is a view showing the construction of a seepage pressure applying member;
FIG. 13 is a schematic view of a connection structure of a left loading base frame and a solid-liquid integrated loading device;
FIG. 14 is a schematic view of a connection structure of a front end loading base frame and a solid-liquid integrated loading device;
FIG. 15 is an experimental flowchart of the solid-liquid coupling experimental apparatus.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the device or assembly referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
This embodiment provides a solid-liquid coupling experimental apparatus, as shown in fig. 1-4, mainly includes: the device comprises a left loading base frame 1, a right loading base frame 2, a front loading base frame 3, a rear loading base frame 4 and a solid-liquid integrated loading device 5;
specifically, the structure of the left loading base frame 1 is completely the same as that of the right loading base frame 2; the front end loading base frame 3 and the rear end loading base frame 4 have the same structure;
the solid-liquid integrated loading device 5 is fixed on the side surface and the bottom surface of the left loading base frame 1 in a clamping groove limiting mode, and the solid-liquid integrated loading device 5 is fixed on the side surface and the upper surface of the right loading base frame 2 in a clamping groove limiting mode; the solid-liquid integrated loading device 5 is respectively fixed on the front end loading base frame 3 and the rear end loading base frame 4 in a clamping groove limiting manner;
specifically, the left loading base frame 1 and the right loading base frame 2 are fixedly connected through bolts, the front loading base frame 3 is fixedly connected with the left loading base frame 1 and the right loading base frame 2 through bolts, and the rear loading base frame 4 is fixedly connected with the left loading base frame 1 and the right loading base frame 2 through bolts, so that a closed solid-liquid integrated uneven coupling loading and unloading experimental environment is formed;
specifically, a left loading foundation frame 1, a right loading foundation frame 2, a front loading foundation frame 3 and a rear loading foundation frame 4 are fixed by bolts to form a stable solid-liquid loading experiment foundation; the solid-liquid integrated loading device 5 can carry out solid-liquid coupling loading on the coal test piece or the rock test piece in the experimental device based on the stable solid-liquid loading experimental basis formed above.
The left loading base frame 1 comprises a top supporting partition plate 101, an upper supporting partition plate 102, a lower supporting partition plate 103, a bottom supporting partition plate 104, a left supporting vertical plate 105, a middle supporting vertical plate 106, a right supporting vertical plate 107, a supporting end plate 108, a vertical plate supporting cross beam 109, an inclined supporting reinforcing plate 110 and a supporting bottom beam 111, which are shown in fig. 5-6;
specifically, the top supporting partition plate 101, the upper supporting partition plate 102, the lower supporting partition plate 103 and the bottom supporting partition plate 104 are respectively and fixedly connected with the left supporting vertical plate 105, the middle supporting vertical plate 106 and the supporting end plate 108; the right supporting vertical plate 107 is respectively fixedly connected with the supporting end plate 108 and the bottom supporting partition plate 104; the vertical plate supporting cross beam 109 is respectively and fixedly connected with the left supporting vertical plate 105 and the middle supporting vertical plate 106, and is used for improving the rigidity of the left supporting vertical plate 105 and the middle supporting vertical plate 106 and preventing deformation after being stressed; the supporting bottom beam 111 is respectively and fixedly connected with the middle supporting vertical plate 106 and the right supporting vertical plate 107, and is used for improving the rigidity of the middle supporting vertical plate 106 and the right supporting vertical plate 107 and providing support for the solid-liquid integrated loading device 5;
a lateral loading device fixing clamping groove 112 is formed in the middle supporting vertical plate 106, a vertical loading device fixing clamping groove 113 is formed in the lower supporting partition plate 103 and used for limiting the solid-liquid integrated loading device 5, and when the solid-liquid integrated loading device 5 applies load to a coal body or rock mass test piece, the lateral loading device fixing clamping groove 112 and the vertical loading device fixing clamping groove 113 can be used for applying counterforce to the left-side loading base frame 1 or the right-side loading base frame 2;
lateral loading frame connecting holes 114 are formed in the middle supporting vertical plate 106 and the right supporting vertical plate 107, wherein the lateral loading frame connecting hole 114 in the middle supporting vertical plate 106 of the left loading base frame 1 is connected with the lateral loading frame connecting hole 114 in the right supporting vertical plate 107 of the right loading base frame 2; the lateral loading frame connecting hole 114 on the right supporting vertical plate 107 of the left loading base frame 1 is connected with the lateral loading frame connecting hole 114 on the middle supporting vertical plate 106 of the right loading base frame 2, as shown in fig. 7;
an end loading base frame connecting hole 115 is formed in the support end plate 108 and is used for being connected and fixed with the front loading base frame 3 and the rear loading base frame 4.
The front end loading base frame 3 comprises a base frame bearing plate 31 and a base frame fixing plate 32, which are shown in fig. 8-9;
specifically, the foundation frame bearing plate 31 is fixedly connected with the foundation frame fixing plate 32, and the end loading device fixing clamping groove 33 is arranged on the foundation frame bearing plate 31 and used for limiting the solid-liquid integrated loading device 5, so that when the solid-liquid integrated loading device 5 applies load to the coal body and rock body test piece, the end loading device fixing clamping groove 33 can be used for applying counter force to the front end loading foundation frame 3 or the rear end loading foundation frame 4;
the foundation frame fixing plate 32 is provided with foundation frame fixing connection holes 34, and the front end loading foundation frame 3 can be connected and fixed with the end loading foundation frame connection holes 115 on the left side loading foundation frame 1 and the right side loading foundation frame 2 through bolts.
The solid-liquid integrated loading device 5 comprises a high-pressure liquid inlet hole column 51, a pressure bearing plate 52, a stress applying member 53 and a seepage pressure applying member 54, which are shown in FIGS. 10 to 12;
specifically, the stress applying member 53 includes a pressurizing hole column 531 and a pressurizing plate 532, wherein the pressurizing plate 532 has a hollow structure; the outer diameter of the pressurizing hole column 531 is the same as the inner diameter of the high-pressure liquid inlet hole column 51, effective sealing is carried out through a sealing ring, and the pressurizing hole column 531 is placed in the high-pressure liquid inlet hole column 51;
in a specific embodiment, when high-pressure liquid enters the high-pressure liquid inlet hole column 51, the high-pressure liquid enters the pressurizing plate 532 through the pressurizing hole column 531, and since the pressurizing plate 532 is of a hollow structure and can move relative to the high-pressure liquid inlet hole column 51 through the pressurizing hole column 531, acting force can be applied to a coal body or rock body test piece in the test device;
specifically, the seepage pressure applying member 54 includes a seepage pressurization hole column 541, a seepage pressurization plate 542, and a seepage hole 543, the seepage pressurization plate 542 is a hollow structure, the outer diameter of the seepage pressurization hole column 541 is the same as the inner diameter of the high-pressure liquid inlet hole column 51, and the seepage pressurization hole column 541 is effectively sealed by a sealing ring, and is placed in the high-pressure liquid inlet hole column 51;
in a specific embodiment, when the high-pressure liquid enters the high-pressure liquid inlet hole column 51, the high-pressure liquid enters the seepage pressure plate 542 through the seepage pressure hole column 541, and because the seepage pressure plate 542 is of a hollow structure, seepage pressure can be applied to a coal body or rock body test piece in the test device through the seepage hole 543;
can exert a plurality of stress 53, the piece 54 is exerted to seepage pressure according to the experiment needs on placing pressure bearing board 52 in, according to the experiment needs to inject the liquid of different pressure into different high pressure inlet hole posts 51, realize exerting different stress and seepage pressure to coal body or rock mass test piece.
Taking a solid-liquid coupling loading and unloading experiment of a coal pillar dam as an example, a method for performing a coal body test piece loading and unloading experiment is described by using the solid-liquid coupling experimental device, and as shown in fig. 13 to 15, the method mainly comprises the following steps:
s001, cutting and polishing the coal sample collected on site according to the size requirement of the solid-liquid coupling loading and unloading experimental device, so that the overall size and the surface flatness of the coal sample test piece meet the experimental requirement;
s002, placing a plurality of solid-liquid integrated loading devices 5 on the lateral loading device fixing slot 112 and the vertical loading device fixing slot 113 of the left loading base frame 1, as shown in fig. 13;
s003, placing the processed and polished coal body test piece on a left loading base frame 1, placing a plurality of solid-liquid integrated loading devices 5 on a lateral loading device fixing clamping groove 112 and a vertical loading device fixing clamping groove 113 of a right loading base frame 2, sealing the clamping groove positions and the joints by adopting sealing strips, and connecting and fixing the left loading base frame 1 and the right loading base frame 2 by utilizing bolts;
s004, respectively placing the solid-liquid integrated loading device 5 in the end loading device fixing slot 33 of the front end loading base frame 3 and the rear end loading base frame 4, as shown in fig. 14, sealing the slot positions and joints with sealing strips, and connecting and fixing the front end loading base frame 3 and the rear end loading base frame 4 with the left side loading base frame 1 and the right side loading base frame 2 by using bolts;
s005, injecting high-pressure liquid into the stress applying member 53 of the solid-liquid integrated loading device 5, injecting different liquid pressure values into different stress applying members 53 according to experimental requirements, simulating different mine pressures applied to different positions of the coal pillar dam body, adjusting the pressure values of the injected liquid according to an actual mine pressure change rule, and simulating a complex stress field applied to the coal pillar dam body;
s006, keeping the stress field unchanged, injecting high-pressure liquid into the seepage pressure applying piece 54 of the solid-liquid integrated loading device 5, and because the coal pillar dam generally only bears single-side water pressure, injecting high-pressure liquid into the seepage pressure applying piece 54 of the solid-liquid integrated loading device 5 on the left loading foundation frame 1 or the right loading foundation frame 2, and injecting liquid with different pressures into the seepage pressure applying pieces 54 in different regions according to experimental requirements to simulate the change of the water pressure value in the underground reservoir;
and S007, after the experiment is finished, sequentially removing the front end loading base frame 3, the rear end loading base frame 4, the right side loading base frame 2, the left side loading base frame 1 and the solid-liquid integrated loading device 5.
What has been described is merely illustrative of the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several other modifications can be made on the basis of the principle of the present invention, and the protection scope of the present invention should be regarded.
Claims (4)
1. A solid-liquid coupling experimental device is characterized by comprising: the device comprises a left loading base frame, a right loading base frame, a front loading base frame, a rear loading base frame and a solid-liquid integrated loading device;
the solid-liquid integrated loading device comprises a high-pressure liquid inlet hole column, a pressure bearing plate, a stress applying piece and a seepage pressure applying piece;
the stress applying piece comprises a pressurizing hole column and a pressurizing plate;
the pressurizing plate is of a hollow structure;
the outer diameter of the pressurizing hole column is the same as the inner diameter of the high-pressure liquid inlet hole column, the pressurizing hole column is effectively sealed through a sealing ring, and the pressurizing hole column is placed in the high-pressure liquid inlet hole column;
the seepage pressure applying piece comprises a seepage pressurizing hole column, a seepage pressurizing plate and a seepage hole;
the seepage pressurization plate is of a hollow structure;
the outer diameter of the seepage pressurization hole column is the same as the inner diameter of the high-pressure liquid inlet hole column, effective sealing is carried out through a sealing ring, and the seepage pressurization hole column is placed in the high-pressure liquid inlet hole column;
the left loading base frame and the right loading base frame have the same structure, and the front loading base frame and the rear loading base frame have the same structure;
the solid-liquid integrated loading device is fixed on the side surface and the bottom surface of the left loading base frame, the side surface and the upper surface of the right loading base frame, the front loading base frame and the rear loading base frame in a clamping groove limiting mode;
the left loading foundation frame and the right loading foundation frame are fixedly connected through bolts, the front loading foundation frame is fixedly connected with the left loading foundation frame and the right loading foundation frame through bolts, and the rear loading foundation frame is fixedly connected with the left loading foundation frame and the right loading foundation frame through bolts.
2. The solid-liquid coupling experimental device according to claim 1, wherein the left loading base frame comprises a top supporting partition plate, an upper supporting partition plate, a lower supporting partition plate, a bottom supporting partition plate, a left supporting vertical plate, a middle supporting vertical plate, a right supporting vertical plate, a supporting end plate, a vertical plate supporting cross beam, an inclined supporting reinforcing plate and a supporting bottom beam;
a lateral loading device fixing clamping groove is formed in the middle supporting vertical plate, and a vertical loading device fixing clamping groove is formed in the lower supporting partition plate and used for limiting the solid-liquid integrated loading device;
the middle supporting vertical plate and the right supporting vertical plate are provided with a lateral loading frame connecting hole;
the supporting end plate is provided with an end loading base frame connecting hole which is used for being connected and fixed with the front end loading base frame and the rear end loading base frame;
the top supporting baffle plate, the upper supporting baffle plate, the lower supporting baffle plate and the bottom supporting baffle plate are respectively and fixedly connected with the left supporting vertical plate, the middle supporting vertical plate and the supporting end plate;
the right supporting vertical plate is fixedly connected with the supporting end plate and the bottom supporting partition plate respectively;
the vertical plate supporting cross beam is respectively and fixedly connected with the left supporting vertical plate and the middle supporting vertical plate;
the supporting bottom beam is fixedly connected with the middle supporting vertical plate and the right supporting vertical plate respectively, and is used for improving the rigidity of the middle supporting vertical plate and the right supporting vertical plate and providing support for the solid-liquid integrated loading device.
3. The solid-liquid coupling experimental device according to claim 1, wherein the front loading base frame comprises a base frame bearing plate and a base frame fixing plate;
the base frame bearing plate is fixedly connected with the base frame fixing plate, and an end loading device fixing clamping groove is arranged on the base frame bearing plate and used for limiting the solid-liquid integrated loading device;
and the foundation frame fixing plate is provided with a foundation frame fixing connecting hole for connecting and fixing the foundation frame with the left loading foundation frame and the right loading foundation frame.
4. A method for carrying out a solid-liquid coupling experiment on a coal body test piece or a rock body test piece by adopting the solid-liquid coupling experiment device as claimed in any one of claims 1 to 3, which is characterized by comprising the following steps:
s001, cutting and polishing the coal sample collected on site according to the size requirement of the solid-liquid coupling loading and unloading experimental device, so that the overall size and the surface flatness of the coal sample test piece meet the experimental requirement;
s002, placing a plurality of solid-liquid integrated loading devices on a lateral loading device fixing clamping groove and a vertical loading device fixing clamping groove of the left loading base frame;
s003, placing the processed and polished coal body test piece on a left loading foundation frame, placing a plurality of solid-liquid integrated loading devices on a lateral loading device fixing clamping groove and a vertical loading device fixing clamping groove of the right loading foundation frame, sealing the clamping groove positions and joints by adopting sealing strips, and connecting and fixing the left loading foundation frame and the right loading foundation frame by utilizing bolts;
s004, respectively placing the solid-liquid integrated loading device into fixing clamping grooves of end loading devices of a front-end loading base frame and a rear-end loading base frame, sealing the positions and joints of the clamping grooves by adopting sealing strips, and connecting and fixing the front-end loading base frame and the rear-end loading base frame with a left-side loading base frame and a right-side loading base frame by utilizing bolts;
s005, injecting high-pressure liquid into a stress applying piece of the solid-liquid integrated loading device, injecting different liquid pressure values into different stress applying pieces according to experimental requirements, simulating different mine pressures applied to different positions of the coal pillar dam body, adjusting the pressure values of the injected liquid according to the actual mine pressure change rule, and simulating a complex stress field applied to the coal pillar dam body;
s006, keeping the stress field unchanged, injecting high-pressure liquid into a seepage pressure applying piece of the solid-liquid integrated loading device, and because the coal pillar dam body generally only bears single-side water pressure, injecting the high-pressure liquid into the seepage pressure applying piece of the solid-liquid integrated loading device on the left loading base frame or the right loading base frame, and injecting liquid with different pressures into the seepage pressure applying pieces in different areas according to experimental requirements to simulate the change of the water pressure value in the underground reservoir;
and S007, after the experiment is finished, sequentially detaching the front end loading base frame, the rear end loading base frame, the right side loading base frame, the left side loading base frame and the solid-liquid integrated loading device.
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