CN109958420B - Visual test device and test method for simulating coal mine stoping roadway fracture evolution - Google Patents
Visual test device and test method for simulating coal mine stoping roadway fracture evolution Download PDFInfo
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- CN109958420B CN109958420B CN201910197783.XA CN201910197783A CN109958420B CN 109958420 B CN109958420 B CN 109958420B CN 201910197783 A CN201910197783 A CN 201910197783A CN 109958420 B CN109958420 B CN 109958420B
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- 239000003245 coal Substances 0.000 title claims abstract description 59
- 238000012360 testing method Methods 0.000 title claims abstract description 31
- 230000000007 visual effect Effects 0.000 title claims abstract description 19
- 238000010998 test method Methods 0.000 title claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000002245 particle Substances 0.000 claims description 98
- 239000002689 soil Substances 0.000 claims description 38
- 238000009826 distribution Methods 0.000 claims description 36
- 239000007788 liquid Substances 0.000 claims description 29
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- 238000009827 uniform distribution Methods 0.000 claims description 22
- 238000003825 pressing Methods 0.000 claims description 9
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- 238000007599 discharging Methods 0.000 claims description 5
- 238000009412 basement excavation Methods 0.000 claims description 3
- 239000012780 transparent material Substances 0.000 claims description 3
- 239000008187 granular material Substances 0.000 abstract description 15
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- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/002—Survey of boreholes or wells by visual inspection
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Abstract
A visual test device for simulating the crack evolution of a coal mine stoping roadway comprises a vacuum barrel, transparent model case and granule equipartition case, the vacuum drum includes upper cover and staving, on cover and install pressure tester and exhaust pipe, exhaust pipe's upper end is connected with the vacuum pump, transparent model case installs bottom center in the staving, granule equipartition case is located transparent model case directly over, transparent model case's upside is uncovered, circular wash port has been seted up to transparent model case's leading flank, be equipped with the rectangle water pocket in the transparent model case, the rectangle water pocket is connected with the drain pipe, the play water end of drain pipe passes circular wash port, the play water end of drain pipe is equipped with the drain valve, the upside and the downside of granule equipartition case are all uncovered, the board group is put in to the downside fixedly connected with granule of granule equipartition case, both sides difference fixed connection is on the front and back both sides inner wall of. The invention has the advantages of scientific design, reasonable structure and convenient manufacture of the model of the coal mine stoping roadway surrounding rock structure.
Description
Technical Field
The invention relates to the field of coal mine simulation experiment devices, in particular to a visual experiment device for simulating fracture evolution of a coal mine stoping roadway and an experiment method thereof.
Background
The coal mine stoping roadway surrounding rock is a composite structure consisting of a top plate, a bottom plate and two sides with different lithology. Mechanical characteristics such as strength and stress characteristics of all parts in the roadway surrounding rock composite structure are different, and effective support can be adopted to realize accurate control of stability of the roadway surrounding rock only by mastering the crack evolution rule of the coal-rock composite structure.
Due to the complexity of the underground engineering environment and the restriction of difficult field research, the similar simulation test becomes an important scientific research means for realizing the reproduction of complex engineering environments such as geotechnical engineering, geology, mines and the like. The existing simulation test can only observe the deformation and the cracks of the surface of the model, and cannot meet the requirement of deep analysis and research on the deformation and the crack expansion of the whole roadway surrounding rock universe.
In order to solve the above problems, people are always seeking an ideal technical solution.
Disclosure of Invention
The invention aims to provide a visual test device and a test method for simulating fracture evolution of a coal mine stoping roadway, which are scientific in design, reasonable in structure and convenient for manufacturing a model of a coal mine stoping roadway surrounding rock structure.
In order to achieve the purpose, the invention adopts the following technical scheme:
a visual test device for simulating crack evolution of a coal mine stoping roadway comprises a vacuum barrel, a transparent model box and a particle distribution box, wherein the vacuum barrel comprises an upper cover and a barrel body, a pressure tester and an air exhaust pipeline are installed on the upper cover, the lower end of the air exhaust pipeline extends into the vacuum barrel, a vacuum pump is connected to the upper end of the air exhaust pipeline, the upper cover, the barrel body, the transparent model box and the particle distribution box are made of transparent materials, the transparent model box and the particle distribution box are of hollow cuboid structures, the transparent model box is fixedly installed at the center of the bottom in the barrel body, the particle distribution box is installed at the upper part in the barrel body and is positioned right above the transparent model box, the upper side of the transparent model box is open, a circular drain hole is formed in the middle of the front side face of the transparent model box, a rectangular water sac arranged in the front-back horizontal direction is arranged in the transparent model box, the rectangular water sac is connected with, the play water end of drain pipe is equipped with the drain valve, and the upside and the downside of granule equipartition case are all uncovered, and the group board is put in to the downside fixedly connected with granule of granule equipartition case, and the group level setting is put in to the granule, and both sides difference fixed connection is on the both sides inner wall around the staving around the group board is put in to the granule.
The particle throwing plate group comprises an upper plate and a lower plate, the upper plate and the lower plate are rectangular plates which are horizontally arranged, the upper plate and the lower plate are the same in size, the cross section of a particle uniform distribution box is smaller than that of the upper plate, the lower side of the particle uniform distribution box is fixedly connected to the upper surface of the upper plate, the upper plate corresponds to the lower plate up and down, the lower plate is arranged on a barrel body below the upper plate in a sliding manner, the front side and the rear side of the upper plate are fixedly connected to the inner walls of the front side and the rear side of the barrel body through two horizontal connecting shafts respectively, the front side and the rear side of the lower plate are connected to the inner walls of the front side and the rear side of the barrel body in a sliding manner through two horizontal sliding shafts respectively, the front ends of the two horizontal sliding shafts on the front side extend out of the front side of the barrel body, the rear ends of the two horizontal sliding shafts on the rear side extend out of the rear side of the, when the lower plate slides forwards and is staggered with the upper plate, each upper throwing through hole is in one-to-one correspondence with each lower throwing through hole.
The upper throwing through hole and the lower throwing through hole are rectangular holes.
The water drainage pipe is hermetically connected with the circular water drainage hole, and the air exhaust pipeline is provided with an air valve.
The test method of the visual test device for simulating the fracture evolution of the coal mine stoping roadway comprises the following steps:
(1) configuring a simulation bottom plate in the transparent model box;
(2) configuring a simulated coal seam positioned at the top of the simulated bottom plate in the transparent model box;
(3) a simulation top plate positioned at the top of the simulation coal seam is arranged in the transparent model box;
(4) taking out the transparent model box from the vacuum barrel;
(5) and applying pressure to a simulation bottom plate, a simulation coal bed and a simulation top plate which are prepared in the transparent model box, and observing the crack evolution process of the simulated coal mine stoping roadway.
The step (1) is specifically as follows: placing a transparent model box at the center of the bottom of a vacuum barrel, adding pore liquid with a calculated volume into the transparent model box, installing an upper plate and a lower plate, installing a particle uniform distribution box on the upper surface of the upper plate, putting a certain amount of transparent soil particles into the particle uniform distribution box, covering an upper cover on the barrel body to isolate the vacuum barrel from the outside, starting a vacuum pump, when the vacuum degree in the vacuum barrel detected by the pressure tester reaches a specified value, the vacuum pump stops working, two horizontal sliding shafts on the front side are drawn to enable the lower plate to slide forwards for a certain distance, the upper plate and the lower plate are staggered, each upper throwing through hole is respectively in one-to-one correspondence with each lower throwing through hole, therefore, the transparent soil particles are uniformly scattered into the pore liquid in the transparent model box from the particle uniform distribution box through the upper feeding through hole and the lower feeding through hole, and the transparent soil particles and the pore liquid are mutually permeated and fused to form the simulation bottom plate.
The step (2) is specifically as follows: pushing two horizontal sliding shafts at the front side to make the lower plate slide backwards and reset, aligning the upper plate and the lower plate vertically, staggering each upper throwing through hole and each lower throwing through hole, opening the upper cover to take out the particle distribution box from the barrel body, then placing the rectangular water bag in the middle of the upper surface of the bottom plate along the front-back direction, connecting a drain pipe at the front side of the rectangular water bag, enabling the drain pipe to pass through a circular drain hole, enabling the water outlet end of the drain pipe to be arranged at the outer side of the transparent model box, adding pore liquid with calculated volume into the transparent model box, then installing the particle distribution box on the upper surface of the upper plate, placing quantitative transparent soil particles into the particle distribution box, then covering the upper cover on the barrel body to isolate the vacuum barrel from the outside, starting the vacuum pump, when the vacuum degree in the vacuum barrel detected by a pressure tester reaches a specified value, stopping the vacuum pump, and pulling the two horizontal sliding shafts at the front side, the lower plate slides forwards for a certain distance, the upper plate and the lower plate are staggered, and the upper feeding through holes respectively correspond to the lower feeding through holes one by one up and down, so that the transparent soil particles are uniformly scattered into pore liquid in the transparent model box from the particle uniform distribution box through the upper feeding through holes and the lower feeding through holes, and the transparent soil particles and the pore liquid are mutually permeated and fused to form a simulated coal bed.
The step (3) is specifically as follows: two horizontal sliding shafts on the front side are pushed to enable the lower plate to slide backwards and reset, the upper plate and the lower plate are aligned vertically, each upper feeding through hole and each lower feeding through hole are staggered, the upper cover is opened to take out the particle distribution box from the barrel body, pore liquid with the calculated volume is added into the transparent model box, then the particle distribution box is installed on the upper surface of the upper plate, quantitative transparent soil particles are placed into the particle distribution box, the upper cover is covered on the barrel body to isolate the vacuum barrel from the outside, the vacuum pump is started, when the vacuum degree in the vacuum barrel detected by the pressure tester reaches a specified value, the vacuum pump stops working, the two horizontal sliding shafts on the front side are pulled to enable the lower plate to slide forwards for a distance, the upper plate and the lower plate are staggered, each upper feeding through hole corresponds to each lower feeding through hole one-to-one-to-one, and therefore the transparent soil particles uniformly fall into the simulated upper coal bed in the transparent model box from the particle distribution box through the upper feeding through holes and the lower feeding In the pore liquid on the side, the transparent soil particles and the pore liquid are mutually permeated and fused to form a simulation top plate.
The step (4) is specifically as follows: two horizontal sliding shafts on the front side are pushed to enable the lower plate to slide backwards and reset, the upper plate and the lower plate are vertically aligned, each upper feeding through hole and each lower feeding through hole are staggered, the upper cover is opened, the particle distribution box is taken out of the barrel body, the upper plate and the lower plate are disassembled and taken out, then the transparent model box is taken out, and the rectangular pressing plate is added on the upper side of the transparent model box.
The step (5) is specifically as follows: the method comprises the following steps of placing a transparent model box on a mechanical testing machine, discharging water in a rectangular water bag through a water discharging pipe, starting the mechanical testing machine, applying pressure to the transparent model box to simulate coal mine roadway excavation, and observing simulated coal mine stoping roadway crack evolution through the transparent model box.
Compared with the prior art, the invention has outstanding substantive characteristics and remarkable progress, and particularly, the transparent model box is placed at the center of the bottom in the barrel body of the vacuum barrel, the particle uniform distribution box is arranged right above the transparent model box, the invention sequentially adds a certain volume of pore liquid and quantitative transparent soil particles into the transparent model box to manufacture a bottom plate model, a top plate model and a coal bed model, and simulates a coal mine stoping roadway through a rectangular water sac, so as to manufacture a model of a coal mine stoping roadway surrounding rock structure, thereby simulating fracture evolution of the coal mine stoping roadway.
The artificially synthesized transparent soil particles have physical and mechanical properties similar to those of real soil bodies and have good transparency. The transparent soil experimental material is used for simulating deformation and damage of the coal mine stoping roadway, so that the crack evolution rule of the coal-rock mass composite structure can be comprehensively mastered, and a reliable scientific basis is provided for optimizing roadway design and construction schemes.
The visual test device for simulating the crack evolution of the coal mine stoping roadway and the test method thereof have the advantages of scientific design, reasonable structure and convenience in manufacturing the model of the surrounding rock structure of the coal mine stoping roadway.
Drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is a left side view of the present invention.
Fig. 3 is a schematic diagram of the upper plate structure of the present invention.
Fig. 4 is a schematic view of the structure of the lower plate of the present invention.
In the figure: 1. a transparent mold box; 2. a particle uniform distribution box; 3. an upper cover; 4. a barrel body; 5. a pressure tester; 6. an air extraction pipeline; 7. a circular drain hole; 8. a rectangular water bag; 9. a drain pipe; 10. a drain valve; 11. an upper plate; 12. a lower plate; 13. a horizontal connecting shaft; 14. a horizontal sliding shaft; 15. putting the through hole upwards; 16. a lower throwing through hole; 17. and (4) an air valve.
Detailed Description
The embodiments of the present invention are further described below with reference to the drawings.
As shown in fig. 1-4, the visual test device for simulating crack evolution of a coal mine stoping roadway comprises a vacuum barrel, a transparent model box 1 and a particle distribution box 2, wherein the vacuum barrel comprises an upper cover 3 and a barrel body 4, a pressure tester 5 and an air exhaust pipeline 6 are installed on the upper cover 3, the lower end of the air exhaust pipeline 6 extends into the barrel body 4, the upper end of the air exhaust pipeline 6 is connected with a vacuum pump, the upper cover 3, the barrel body 4, the transparent model box 1 and the particle distribution box 2 are made of transparent materials, the transparent model box 1 and the particle distribution box 2 are both in hollow cuboid structures, the transparent model box 1 is fixedly installed at the center of the bottom in the barrel body 4, the particle distribution box 2 is installed at the upper part in the barrel body 4 and is positioned right above the transparent model box 1, the upper side of the transparent model box 1 is open, a circular drain hole 7 is formed in the middle part of the front side surface of the transparent model box 1, a rectangular water sac 8 arranged, rectangular water bag 8 is connected with drain pipe 9, and the play water end of drain pipe 9 passes circular wash port 7 and establishes in the outside of transparent mold box 1, and the play water end of drain pipe 9 is equipped with drain valve 10, and the upside and the downside of granule equipartition case 2 are all uncovered, and the group is put in to the downside fixedly connected with granule of granule equipartition case 2, and the group level setting is put in to the granule, and both sides difference fixed connection is on the both sides inner wall around the staving 4 around the group is put in to the granule.
The vacuum pump is conventional in the art and is not shown.
The particle throwing plate group comprises an upper plate 11 and a lower plate 12, wherein the upper plate 11 and the lower plate 12 are rectangular plates which are horizontally arranged, the upper plate 11 and the lower plate 12 have the same size, the cross section of a particle uniform distribution box 2 is smaller than that of the upper plate 11, the lower side of the particle uniform distribution box 2 is fixedly connected with the upper surface of the upper plate 11, the upper plate 11 corresponds to the lower plate 12 up and down, the lower plate 12 is glidingly arranged on a barrel body 4 below the upper plate 11, the front side and the rear side of the upper plate 11 are respectively and fixedly connected with the inner walls of the front side and the rear side of the barrel body 4 through two horizontal connecting shafts 13, the front side and the rear side of the lower plate 12 are respectively and glidingly connected with the inner walls of the front side and the rear side of the barrel body 4 through two horizontal sliding shafts 14, the front ends of the two horizontal sliding shafts 14 at the front side extend out of the front side of the barrel body 4, a plurality of upper throwing, when the upper plate 11 and the lower plate 12 are vertically aligned, each upper throwing through hole 15 and each lower throwing through hole 16 are staggered with each other, and when the lower plate 12 slides forwards and is staggered with the upper plate 11, each upper throwing through hole 15 corresponds to each lower throwing through hole 16 up and down one by one.
The upper throwing through hole 15 and the lower throwing through hole 16 are both rectangular holes.
The water discharge pipe 9 is connected with the round water discharge hole 7 in a sealing way, and the air exhaust pipeline 6 is provided with an air valve 17.
The test method of the visual test device for simulating the fracture evolution of the coal mine stoping roadway comprises the following steps:
(1) a simulation bottom plate is arranged in the transparent model box 1;
(2) a simulated coal seam positioned at the top of the simulated bottom plate is arranged in the transparent model box 1;
(3) a simulation top plate positioned at the top of the simulation coal seam is arranged in the transparent model box 1;
(4) taking out the transparent model box 1 from the vacuum barrel;
(5) and applying pressure to a simulation bottom plate, a simulation coal bed and a simulation top plate which are prepared in the transparent model box 1, and observing the crack evolution process of the simulated coal mine stoping roadway.
The step (1) is specifically as follows: placing a transparent model box 1 at the center of the bottom of a barrel body 4 of a vacuum barrel, adding pore liquid with a calculated volume into the transparent model box 1, installing an upper plate 11 and a lower plate 12, installing a particle distribution box 2 on the upper surface of the upper plate 11, placing quantitative transparent soil particles into the particle distribution box 2, covering an upper cover 3 on the barrel body 4 to isolate the vacuum barrel from the outside, starting a vacuum pump, stopping the vacuum pump when the vacuum degree in the vacuum barrel detected by a pressure tester 5 reaches a specified value, pumping two horizontal sliding shafts 14 at the front side to enable the lower plate 12 to slide forward for a certain distance, staggering the upper plate 11 and the lower plate 12, respectively enabling each upper feeding through hole 15 to be vertically corresponding to each lower feeding through hole 16 one by one, and enabling the transparent soil particles to be uniformly dispersed into the pore liquid in the transparent model box 1 from the particle distribution box 2 through the upper feeding through holes 15 and the lower feeding through holes 16, the transparent soil particles and pore liquid are mutually permeated and fused to form a simulation bottom plate.
The step (2) is specifically as follows: when the simulation bottom plate reaches a certain strength, two horizontal sliding shafts 14 at the front side are pushed to enable the lower plate 12 to slide backwards and reset, the upper plate 11 and the lower plate 12 are aligned up and down, each upper throwing through hole 15 and each lower throwing through hole 16 are staggered, so that transparent soil particles stop scattering downwards, the upper cover 3 is opened, the particle uniform distribution box 2 is taken out of the barrel body 4, then the rectangular water bag 8 is placed in the middle of the upper surface of the bottom plate along the front-back direction, the front side of the rectangular water bag 8 is connected with the water discharge pipe 9, the water discharge pipe 9 penetrates through the circular water discharge hole 7, the water outlet end of the water discharge pipe is arranged at the outer side of the transparent model box 1, pore liquid with the calculated volume is added into the transparent model box 1, then the particle uniform distribution box 2 is installed on the upper surface of the upper plate 11, a certain amount of transparent soil particles are placed into the particle uniform distribution box 2, then the upper cover 3 is covered on the barrel body 4, so, starting a vacuum pump, stopping the vacuum pump when the vacuum degree in the vacuum barrel detected by the pressure tester 5 reaches a specified value, pumping two horizontal sliding shafts 14 at the front side to enable the lower plate 12 to slide forwards for a certain distance, staggering the upper plate 11 and the lower plate 12, and enabling the upper feeding through holes 15 to respectively correspond to the lower feeding through holes 16 one by one up and down, so that the transparent soil particles are uniformly scattered into pore liquid in the transparent model box 1 from the particle distribution box 2 through the upper feeding through holes 15 and the lower feeding through holes 16, and the transparent soil particles and the pore liquid are mutually permeated and fused to form a simulated coal bed.
The step (3) is specifically as follows: when the simulated coal bed reaches a certain strength, two horizontal sliding shafts 14 at the front side are pushed to enable the lower plate 12 to slide backwards and reset, the upper plate 11 and the lower plate 12 are aligned up and down, each upper throwing through hole 15 and each lower throwing through hole 16 are staggered with each other, so that transparent soil particles stop scattering downwards, the upper cover 3 is opened, the particle distribution box 2 is taken out from the barrel body 4, pore liquid with a calculated volume is added into the transparent model box 1, then the particle distribution box 2 is installed on the upper surface of the upper plate 11, a certain amount of transparent soil particles are put into the particle distribution box 2, then the upper cover 3 is covered on the barrel body 4 to isolate the vacuum barrel from the outside, the vacuum pump is started, when the vacuum degree in the vacuum barrel detected by the pressure tester 5 reaches a specified value, the vacuum pump stops working, the two horizontal sliding shafts 14 at the front side are pulled to enable the lower plate 12 to slide forwards for a certain distance, and the upper plate 11 is staggered with the lower plate 12, the upper throwing through holes 15 are respectively in one-to-one correspondence with the lower throwing through holes 16, so that transparent soil particles are uniformly scattered into pore liquid on the upper side of the simulated coal bed in the transparent model box 1 from the particle distribution box 2 through the upper throwing through holes 15 and the lower throwing through holes 16, and the transparent soil particles and the pore liquid are mutually permeated and fused to form a simulated top plate.
The step (4) is specifically as follows: when the simulation top plate reaches a certain strength, two horizontal sliding shafts 14 on the front side are pushed to enable the lower plate 12 to slide backwards and reset, the upper plate 11 and the lower plate 12 are aligned vertically, each upper throwing through hole 15 and each lower throwing through hole 16 are staggered mutually, so that transparent soil particles stop scattering downwards, the upper cover 3 is opened, the particle distribution box 2 is taken out from the barrel body 4, the upper plate 11 and the lower plate 12 are disassembled and taken out, then the transparent model box 1 is taken out, and a rectangular pressing plate is added on the upper side of the transparent model box 1.
The step (5) is specifically as follows: placing the transparent model box 1 on a mechanical testing machine, discharging water in the rectangular water bag 8 through a water discharge pipe 9, starting the mechanical testing machine, applying pressure to the transparent model box 1 to simulate coal mine roadway excavation, and observing simulated coal mine stoping roadway crack evolution through the transparent model box 1.
A transparent model box 1 is placed in the center of the bottom in a barrel body 4 of a vacuum barrel, a particle distribution box 2 is arranged right above the transparent model box 1, a certain volume of pore liquid and a certain amount of transparent soil particles are sequentially added into the transparent model box 1 to manufacture a bottom plate model, a top plate model and a coal bed model, and a coal mine stoping roadway is simulated through a rectangular water sac, so that a coal mine stoping roadway surrounding rock structure model is manufactured, and the fracture evolution of the coal mine stoping roadway is simulated.
The artificially synthesized transparent soil particles have physical and mechanical properties similar to those of real soil bodies and have good transparency. The transparent soil experimental material is used for simulating deformation and damage of the coal mine stoping roadway, so that the crack evolution rule of the coal-rock mass composite structure can be comprehensively mastered, and a reliable scientific basis is provided for optimizing roadway design and construction schemes.
The above embodiments are merely to illustrate rather than to limit the technical solutions of the present invention, and although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that; modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (9)
1. Visual test device of simulation coal mine stoping tunnel crack evolution, its characterized in that: the vacuum barrel comprises an upper cover and a barrel body, wherein a pressure tester and an air exhaust pipeline are installed on the upper cover, the lower end of the air exhaust pipeline extends into the vacuum barrel, a vacuum pump is connected to the upper end of the air exhaust pipeline, the upper cover, the barrel body, a transparent model box and a particle uniform distribution box are made of transparent materials, the transparent model box and the particle uniform distribution box are both of hollow cuboid structures in appearance, the transparent model box is fixedly installed at the center of the bottom in the barrel body, the particle uniform distribution box is installed at the upper part in the barrel body and is positioned right above the transparent model box, the upper side of the transparent model box is open, a circular drain hole is formed in the middle of the front side face of the transparent model box, rectangular water bags are arranged in the transparent model box along the front-back horizontal direction and are connected with a drain pipe, and the water outlet end of the drain pipe penetrates through the circular drain, the water outlet end of the water drainage pipe is provided with a water drainage valve, the upper side and the lower side of the particle distribution box are both open, the lower side of the particle distribution box is fixedly connected with a particle feeding plate group, the particle feeding plate group is horizontally arranged, and the front side and the rear side of the particle feeding plate group are respectively connected to the inner walls of the front side and the rear side of the barrel body;
the particle throwing plate group comprises an upper plate and a lower plate, the upper plate and the lower plate are rectangular plates which are horizontally arranged, the upper plate and the lower plate are the same in size, the cross section of a particle uniform distribution box is smaller than that of the upper plate, the lower side of the particle uniform distribution box is fixedly connected to the upper surface of the upper plate, the upper plate corresponds to the lower plate up and down, the lower plate is arranged on a barrel body below the upper plate in a sliding manner, the front side and the rear side of the upper plate are fixedly connected to the inner walls of the front side and the rear side of the barrel body through two horizontal connecting shafts respectively, the front side and the rear side of the lower plate are connected to the inner walls of the front side and the rear side of the barrel body in a sliding manner through two horizontal sliding shafts respectively, the front ends of the two horizontal sliding shafts on the front side extend out of the front side of the barrel body, the rear ends of the two horizontal sliding shafts on the rear side extend out of the rear side of the, when the lower plate slides forwards and is staggered with the upper plate, each upper throwing through hole is in one-to-one correspondence with each lower throwing through hole.
2. The visual test device for simulating coal mine stoping roadway fracture evolution of claim 1, which is characterized in that: the upper throwing through hole and the lower throwing through hole are rectangular holes.
3. The visual test device for simulating coal mine stoping roadway fracture evolution of claim 2, characterized in that: the water drainage pipe is hermetically connected with the circular water drainage hole, and the air exhaust pipeline is provided with an air valve.
4. A test method of a visual test device for simulating coal mine stoping roadway fracture evolution as claimed in claim 3, characterized in that: the method comprises the following steps:
(1) configuring a simulation bottom plate in the transparent model box;
(2) configuring a simulated coal seam positioned at the top of the simulated bottom plate in the transparent model box;
(3) a simulation top plate positioned at the top of the simulation coal seam is arranged in the transparent model box;
(4) taking out the transparent model box from the vacuum barrel;
(5) and applying pressure to a simulation bottom plate, a simulation coal bed and a simulation top plate which are prepared in the transparent model box, and observing the crack evolution process of the simulated coal mine stoping roadway.
5. The testing method of the visual testing device for simulating the crack evolution of the coal mine stoping roadway according to claim 4, characterized in that: the step (1) is specifically as follows: placing a transparent model box at the center of the bottom of a vacuum barrel, adding pore liquid with a calculated volume into the transparent model box, installing an upper plate and a lower plate, installing a particle uniform distribution box on the upper surface of the upper plate, putting a certain amount of transparent soil particles into the particle uniform distribution box, covering an upper cover on the barrel body to isolate the vacuum barrel from the outside, starting a vacuum pump, when the vacuum degree in the vacuum barrel detected by the pressure tester reaches a specified value, the vacuum pump stops working, two horizontal sliding shafts on the front side are drawn to enable the lower plate to slide forwards for a certain distance, the upper plate and the lower plate are staggered, each upper throwing through hole is respectively in one-to-one correspondence with each lower throwing through hole, therefore, the transparent soil particles are uniformly scattered into the pore liquid in the transparent model box from the particle uniform distribution box through the upper feeding through hole and the lower feeding through hole, and the transparent soil particles and the pore liquid are mutually permeated and fused to form the simulation bottom plate.
6. The testing method of the visual testing device for simulating the crack evolution of the coal mine stoping roadway according to claim 5, characterized in that: the step (2) is specifically as follows: pushing two horizontal sliding shafts at the front side to make the lower plate slide backwards and reset, aligning the upper plate and the lower plate vertically, staggering each upper throwing through hole and each lower throwing through hole, opening the upper cover to take out the particle distribution box from the barrel body, then placing the rectangular water bag in the middle of the upper surface of the bottom plate along the front-back direction, connecting a drain pipe at the front side of the rectangular water bag, enabling the drain pipe to pass through a circular drain hole, enabling the water outlet end of the drain pipe to be arranged at the outer side of the transparent model box, adding pore liquid with calculated volume into the transparent model box, then installing the particle distribution box on the upper surface of the upper plate, placing quantitative transparent soil particles into the particle distribution box, then covering the upper cover on the barrel body to isolate the vacuum barrel from the outside, starting the vacuum pump, when the vacuum degree in the vacuum barrel detected by a pressure tester reaches a specified value, stopping the vacuum pump, and pulling the two horizontal sliding shafts at the front side, the lower plate slides forwards for a certain distance, the upper plate and the lower plate are staggered, and the upper feeding through holes respectively correspond to the lower feeding through holes one by one up and down, so that the transparent soil particles are uniformly scattered into pore liquid in the transparent model box from the particle uniform distribution box through the upper feeding through holes and the lower feeding through holes, and the transparent soil particles and the pore liquid are mutually permeated and fused to form a simulated coal bed.
7. The testing method of the visual testing device for simulating the crack evolution of the coal mine stoping roadway according to claim 6, characterized in that: the step (3) is specifically as follows: two horizontal sliding shafts on the front side are pushed to enable the lower plate to slide backwards and reset, the upper plate and the lower plate are aligned vertically, each upper feeding through hole and each lower feeding through hole are staggered, the upper cover is opened to take out the particle distribution box from the barrel body, pore liquid with the calculated volume is added into the transparent model box, then the particle distribution box is installed on the upper surface of the upper plate, quantitative transparent soil particles are placed into the particle distribution box, the upper cover is covered on the barrel body to isolate the vacuum barrel from the outside, the vacuum pump is started, when the vacuum degree in the vacuum barrel detected by the pressure tester reaches a specified value, the vacuum pump stops working, the two horizontal sliding shafts on the front side are pulled to enable the lower plate to slide forwards for a distance, the upper plate and the lower plate are staggered, each upper feeding through hole corresponds to each lower feeding through hole one-to-one-to-one, and therefore the transparent soil particles uniformly fall into the simulated upper coal bed in the transparent model box from the particle distribution box through the upper feeding through holes and the lower feeding In the pore liquid on the side, the transparent soil particles and the pore liquid are mutually permeated and fused to form a simulation top plate.
8. The testing method of the visual testing device for simulating the crack evolution of the coal mine stoping roadway according to claim 7, characterized in that: the step (4) is specifically as follows: two horizontal sliding shafts on the front side are pushed to enable the lower plate to slide backwards and reset, the upper plate and the lower plate are vertically aligned, each upper feeding through hole and each lower feeding through hole are staggered, the upper cover is opened, the particle distribution box is taken out of the barrel body, the upper plate and the lower plate are disassembled and taken out, then the transparent model box is taken out, and the rectangular pressing plate is added on the upper side of the transparent model box.
9. The testing method of the visual testing device for simulating the crack evolution of the coal mine stoping roadway according to claim 8, characterized in that: the step (5) is specifically as follows: the method comprises the following steps of placing a transparent model box on a mechanical testing machine, discharging water in a rectangular water bag through a water discharging pipe, starting the mechanical testing machine, applying pressure to the transparent model box to simulate coal mine roadway excavation, and observing simulated coal mine stoping roadway crack evolution through the transparent model box.
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| CN114215504A (en) * | 2022-01-08 | 2022-03-22 | 西安石油大学 | Visual simulation device and method for liquid retention after large-scale fracturing |
| CN116883224B (en) * | 2023-07-04 | 2024-04-16 | 煤炭科学研究总院有限公司 | Coal mine roadway image generation system and method for containing designated features |
| CN117145477B (en) * | 2023-10-30 | 2024-01-30 | 华能煤炭技术研究有限公司 | Coal mining method with uniform subsidence of earth surface |
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