CN210982055U - Experimental device for test coal mining in-process bursting water sand bursting start condition - Google Patents
Experimental device for test coal mining in-process bursting water sand bursting start condition Download PDFInfo
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- CN210982055U CN210982055U CN201921749234.0U CN201921749234U CN210982055U CN 210982055 U CN210982055 U CN 210982055U CN 201921749234 U CN201921749234 U CN 201921749234U CN 210982055 U CN210982055 U CN 210982055U
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Abstract
The utility model discloses an experimental device for test coal mining in-process bursting water sand bursting start condition, include: the device comprises a containing cavity for containing an experimental sample, a soil pressure equivalent supply system for providing in-situ pressure equivalent loading of a loose layer soil body for the experimental sample in the containing cavity, a water level loading system for injecting water into the containing cavity, and a water surface air pressure supply system for providing water head pressure equivalent loading for the containing cavity; the holding cavity is internally provided with a bedrock test piece which is placed at the bottom of the experimental sample and is provided with a fracture channel, and the upper part of the bedrock test piece is provided with a water pressure sensor which is in communication connection with the water pressure information collector. The utility model discloses can carry out systematic experimental study to bursting water sand bursting disaster starting condition, thereby can realize effective acquisition for the calamity early warning to bursting water sand bursting disaster's the change information of the preceding pore water pressure of start-up provide the foundation, provide reason foundation for bursting water sand bursting disaster's prevention and cure to prevention economic loss improves the security of mining environment in the pit.
Description
Technical Field
The utility model relates to a colliery is experimental relevant technical field, especially an experimental apparatus of test coal mining in-process bursting water sand bursting start condition.
Background
A goaf is formed after coal resources are mined, the stable state of the whole overlying strata is broken due to the fact that the rock mass on the upper portion of the goaf loses bottom restraint, the overlying strata collapse, move and settle towards the goaf under the action of gravity, and a new balance state is finally achieved through long-time internal stress adjustment. In the process of adjusting from an original stress balance state to a new stress balance state, huge damage occurs inside the overlying rock body, and the rock body damage process is the development process of 'initiation-development-through-closure' of cracks inside the rock body.
The western coal resources in China are abundant in reserves, the occurrence conditions of the coal are simple, and the method is extremely suitable for large-scale mechanized mining. The working conditions of thin bedrock test piece thickness, large loose layer thickness and large water head height in the loose layer are commonly met in the shallow coal mining process. Because the bedrock test piece is small in thickness, the whole bedrock test piece layer completely collapses under the influence of mining, rock body cracks penetrate through the whole bedrock test piece layer to form crack channels for connecting a loose aquifer and a goaf, so that water sand bursts to a coal face along the bedrock test piece cracks, accumulated sand bodies bury a hydraulic support and mining equipment, so that the hydraulic support cannot move forwards along with the driving face, the mixture of the water burst and the sand bursts causes the water burst in the well to increase suddenly, and the water carrying the sediment cannot be directly discharged out by using a water pump, so that the normal mining working progress is seriously influenced, and the life safety of underground workers is seriously threatened.
In recent years, western mining areas have been affected by multiple water bursting and sand bursting accidents, and mine production units do a large amount of disaster prevention and control work aiming at water bursting and sand bursting, and the main work comprises the following steps: before mining, water is drained, and cement slurry is poured into a loose layer on the top of a bedrock test piece, so that great manpower, material resources and financial resources are consumed while a certain disaster prevention and reduction effect is achieved. At present, the problems encountered by mine production units in the process of developing water drainage are as follows: the water head height needs to be controlled within a certain range to be safe, the thickness of the bedrock test piece is lower than the thickness of the bedrock test piece to be safe, and the pouring of cement slurry into a unconsolidated layer on the top of the bedrock test piece needs to be at least to a certain extent. The quantitative relation of various main control factors generated by water bursting and sand bursting needs to be determined, so that the technical situations that theoretical guidance is lacked, water discharging holes are increased blindly and grouting amount is increased blindly in the implementation process of the prior art are changed.
Aiming at the problems encountered in field construction, a large number of expert and scholars develop a large number of researches, and research results show that the occurrence of the water bursting and sand bursting disasters is related to a large number of influence factors, wherein the thickness of a bedrock test piece, the thickness of a clay layer, the thickness of a loose water-bearing layer and the fracture characteristics of a mining bedrock test piece on a working surface are all important influence factors for starting the water bursting and sand bursting disasters. However, the quantitative research result of the starting condition of the water bursting and sand bursting disaster is relatively scarce, the main reason is that a large amount of experimental sample data is needed for the starting condition of the water bursting and sand bursting disaster under the influence of multiple factors, the current reference data can be only the engineering condition of the disaster site, and the progress of the quantitative research of the water bursting and sand bursting disaster is severely limited due to the lack of complete indoor simulation test equipment.
SUMMERY OF THE UTILITY MODEL
Based on this, it is necessary to provide an experimental apparatus for testing the water bursting and sand bursting start-up conditions in the coal mining process, aiming at the technical problem that the prior art lacks complete indoor simulation test equipment for testing the water bursting and sand bursting start-up conditions in the coal mining process.
The utility model provides an experimental device for test coal mining in-process bursting water sand bursting start condition, include: the device comprises a containing cavity for containing an experimental sample, a soil pressure equivalent supply system which is connected with the containing cavity and provides the experimental sample in the containing cavity with the in-situ pressure equivalent loading of the unconsolidated formation soil body, a water level loading system which is connected with the containing cavity and supplies water into the containing cavity, and a water surface air pressure supply system which is connected with the containing cavity and provides the containing cavity with the water head pressure equivalent loading;
the experimental sample containing cavity is characterized in that a bedrock test piece which is placed at the bottom of the experimental sample and is provided with a fracture channel is arranged in the containing cavity, a water pressure sensor which is in communication connection with a water pressure information collector is arranged at the upper part of the bedrock test piece, an opening area which can be opened and closed is arranged at the bottom of the containing cavity, and an outlet at the lower end of the fracture channel is located in the opening area.
Further, the accommodation cavity comprises: the base is provided with the hole-opening area, the barrel body and the top cover, the bedrock test piece is placed on the base, an outlet at the lower end of the fracture channel is located in the hole-opening area, the hole-opening area is provided with a rotary plug screw, the barrel body is sleeved with the bedrock test piece and erected on the base, and the top cover is installed on the upper portion of the barrel body;
the soil pressure equivalent replenishment system is provided with a soil pressure replenishment plate which penetrates through the top cover and provides in-situ pressure equivalent loading of the loose layer soil body for the experimental sample in the barrel body;
and the top cover is provided with a water injection air inlet for the water surface air pressure supply system to provide equivalent water head pressure loading for the experimental sample of the barrel body.
Furthermore, the water pressure information collector is in communication connection with the water pressure sensor through a communication line buried in the bedrock test piece.
Furthermore, a groove is formed in the base, the barrel body is arranged on the groove, and a sealing piece is arranged between the barrel body and the groove.
Furthermore, caulking sand is filled between the barrel body and the bedrock test piece.
Furthermore, the accommodating cavity further comprises a leveling support arranged below the base.
Further, the soil pressure equivalent replenishing system also comprises the following components which are communicated in sequence: the soil pressure compensating device comprises an air pump, a first air pressure control valve, a first stop valve, an air pressure reversal control valve and an air cylinder, wherein a telescopic rod of the air cylinder is connected with the soil pressure supplementing plate.
Still further, the surface of water atmospheric pressure system of supplying includes that communicate in proper order: the water source and a third stop valve, the third stop valve with the water injection inlet port intercommunication.
Still further, the surface air pressure supply system includes: the setting is in the air pump with three way connection, first quick-operation joint, second quick-operation joint and fourth stop valve between the first pneumatic control valve, three way connection passes through second pneumatic control valve, second stop valve and second quick-operation joint intercommunication, the third stop valve in proper order with first quick-operation joint and fourth stop valve intercommunication, first quick-operation joint with second quick-operation joint can dismantle the connection.
Still further, the soil pressure supplement plate is a rigid sieve tray.
The utility model discloses a true simulation of on-spot flood peak height, the true simulation of the original stress state of on-spot unconsolidated formation bottom sand body unit has been realized, the indoor calamity process simulation of coal face bursting water sand burst accident has been realized, can develop quantitative research and calamity aassessment to the bursting water sand burst disaster to different on-the-spot engineering circumstances through the indoor experiment, can develop systematic experimental study to bursting water sand burst disaster starting condition, thereby can realize effective collection for the calamity early warning to the change information of bursting water pore water pressure before bursting water sand burst disaster's the start-up provides the foundation, for bursting water sand disaster's prevention and control provides the reason foundation, in order to prevent economic loss, improve the security of mining environment in the pit.
Drawings
Fig. 1 is a schematic structural diagram of an experimental device for testing the water bursting and sand bursting starting conditions in the coal mining process of the utility model;
fig. 2 shows an experimental method of the experimental apparatus for testing the water bursting and sand bursting start conditions in the coal mining process according to the preferred embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 the utility model relates to a test coal mining in-process experimental apparatus's of bursting water sand bursting start condition's structural schematic diagram, include: the device comprises a containing cavity for containing an experimental sample, a soil pressure equivalent supply system which is connected with the containing cavity and provides the experimental sample in the containing cavity with the in-situ pressure equivalent loading of the unconsolidated formation soil body, a water level loading system which is connected with the containing cavity and supplies water into the containing cavity, and a water surface air pressure supply system which is connected with the containing cavity and provides the containing cavity with the water head pressure equivalent loading;
the water pressure monitoring device is characterized in that a bedrock test piece 22 which is placed at the bottom of the experimental sample and is provided with a fracture channel 19 is arranged in the containing cavity, a water pressure sensor 20 which is in communication connection with the water pressure information collector 1 is arranged at the upper part of the bedrock test piece 22, an opening area which can be opened and closed is arranged at the bottom of the containing cavity, and an outlet at the lower end of the fracture channel 19 is located in the opening area.
Specifically, the bedrock test piece 22 is provided with test samples including, but not limited to, a clay layer 24 and a sand layer 25 corresponding to the experimental protocol.
During the experiment, the closed opening area is firstly filled with the clay layer 24 corresponding to the experimental scheme above the bedrock test piece 22, and the sand layer 25 with the required thickness and mixed according to the proportion is filled after being compacted and leveled and is compacted and leveled. Then, providing in-situ pressure equivalent loading of the loose-bed soil body in the accommodating cavity through the soil pressure equivalent replenishment system, and injecting water into the accommodating cavity to an experimental design height through the water level loading system; and air pressure is supplied to the accommodating cavity through the water surface air pressure supply system, and the actual water head height of the engineering simulation is realized through the action of the air pressure on water.
And then, opening the opening area, and carrying out an experiment for testing the water bursting and sand bursting starting conditions in the coal mining process.
The utility model discloses a true simulation of on-spot flood peak height, the true simulation of the original stress state of on-spot unconsolidated formation bottom sand body unit has been realized, the indoor calamity process simulation of coal face bursting water sand burst accident has been realized, can develop quantitative research and calamity aassessment to the bursting water sand burst disaster to different on-the-spot engineering circumstances through the indoor experiment, can develop systematic experimental study to bursting water sand burst disaster starting condition, thereby can realize effective collection for the calamity early warning to the change information of bursting water pore water pressure before bursting water sand burst disaster's the start-up provides the foundation, for bursting water sand disaster's prevention and control provides the reason foundation, in order to prevent economic loss, improve the security of mining environment in the pit.
In one embodiment, the receiving cavity includes: the base 2, the barrel body 3 and the top cover 4 are arranged in the hole forming area, the bedrock test piece 22 is placed on the base 2, the outlet at the lower end of the fracture channel 19 is located in the hole forming area, the hole forming area is provided with a rotary plug screw 33, the barrel body 3 is erected on the base 2 after being sleeved with the bedrock test piece, and the top cover 4 is installed on the upper portion of the barrel body 3;
the soil pressure equivalent replenishment system is provided with a soil pressure replenishment plate 21 which penetrates through the top cover 4 and provides in-situ pressure equivalent loading of loose layer soil for the experimental sample in the barrel body 3;
and the top cover 4 is provided with a water injection air inlet 6 for the water surface air pressure supply system to provide equivalent water head pressure loading for the experimental sample of the barrel body 3.
The embodiment realizes the specific structure of the accommodating cavity.
In one embodiment, the water pressure information collector 1 is in communication connection with the water pressure sensor 20 through a communication line buried in the bedrock test piece 22.
Specifically, the link communication line of the water pressure sensor 20 and the water pressure information collector 1 is built into concrete during the prefabrication of the bedrock.
In the embodiment, the communication line is buried in the bedrock test piece so as to ensure the smooth communication between the water pressure sensor and the water pressure information collector.
In one embodiment, the base 2 is provided with a groove, the barrel 3 is arranged on the groove, and a sealing member 28 is arranged between the barrel 3 and the groove.
Specifically, the seal 28 is a sealing rubber ring.
This embodiment guarantees the leakproofness of staving through setting up the sealing member.
In one embodiment, caulking sand 23 is filled between the barrel body 3 and the bedrock test piece 22.
Specifically, caulking sand 23 is filled into the gap between the bedrock test piece 22 and the barrel 3, and is tamped along the gap with a metal thin rod.
In one embodiment, the receiving cavity further comprises a leveling support 34 disposed below the base 2.
The present embodiment achieves leveling of the base 2 by providing the leveling support 34.
In one embodiment, the equivalent soil pressure replenishment system further comprises: the soil pressure compensating device comprises an air pump 11, a first air pressure control valve 9, a first stop valve 8, an air pressure reversal control valve 7 and an air cylinder 5, wherein the telescopic rod of the air cylinder 5 is connected with the soil pressure supplementing plate 21.
The present embodiment provides pressure to the soil pressure supplement plate through the air cylinder.
In one embodiment, the water level loading system comprises: a water source 14, and a third stop valve 15, the third stop valve 15 being in communication with the water injection inlet hole 6.
This embodiment realizes the water injection in the holding cavity through water source and third stop valve.
In one embodiment, the surface air pressure supply system comprises: the setting is in the air pump 11 with three way connection 10, first quick-operation joint 16, second quick-operation joint 17 and fourth stop valve 18 between the first pneumatic control valve 9, three way connection 10 passes through second pneumatic control valve 13, second stop valve 12 and second quick-operation joint 17 intercommunication, third stop valve 15 in proper order with first quick-operation joint 16 and fourth stop valve 18 intercommunication, first quick-operation joint 16 with second quick-operation joint 17 can dismantle the connection.
The embodiment realizes the air pressure supply on the water surface through the air pump.
In one embodiment, the soil pressure supplement plate 21 is a rigid sieve tray.
As the utility model discloses the best embodiment, an experimental apparatus for test coal mining in-process bursting water sand bursting start condition, include: the device comprises a water pressure information collector 1, a base 2, a barrel body 3 using a transparent acrylic barrel, a top cover 4, a cylinder 5, a water injection air inlet 6, an air pressure reversal control valve 7, a first stop valve 8, a first air pressure control valve 9, a three-way joint 10, an air pump 11, a second stop valve 12, a second air pressure control valve 13, a water source 14, a third stop valve 15, a first quick joint 16, a second quick joint 17, a fourth stop valve 18, a fracture channel 19, a water pressure sensor 20, a soil pressure supplement plate 21, a bedrock test piece 22, caulking sand 23, a clay layer 24, a sand layer 25, a water layer 26, air 27, a sealing rubber ring 28, an acrylic barrel fixing groove 29, a flange sheet 30, a screw rod 31, a nut 32, a rotary screw plug 33 and a leveling support 34. Placing a prefabricated bedrock test piece 22 with cracks at the right middle position of a circular groove at the upper part of a leveling support 34, placing a water pressure sensor 20 connected with a water pressure information collector 1 at the upper part of the bedrock test piece, placing a lead of the water pressure information collector 1 in the bedrock test piece 22 in advance in the process of prefabricating the bedrock test piece 22, placing a sealing rubber ring 28 at the edge position of the circular groove 29 at the upper surface of the leveling support 34, sleeving an acrylic barrel 3 on the bedrock test piece 22, standing in the circular groove 29 at the upper surface of the leveling support 34, ensuring that the bottom of the acrylic barrel 3 is uniformly covered on the sealing rubber ring 28, placing caulking sand 23 into the gap between the bedrock test piece 22 and the acrylic barrel 3, paving a sand layer 25 sampled on site at the upper part of the bedrock test piece 22, installing a top cover 4 at the upper part of the acrylic barrel 3, adjusting the top cover 4 to be horizontal through a flange 30, a screw rod 31 and a nut 32, the air cylinder 5, the air pressure reversal control valve 7, the first stop valve 8, the first air pressure control valve 9, the three-way joint 10 and the air pump 11 are connected in series through a conduit to form a soil pressure equivalent replenishing system, the in-situ pressure equivalent loading of the unconsolidated layer soil body is realized by adjusting the first air pressure control valve 9, the first stop valve 8, the air pressure reversal control valve 7 and the soil pressure replenishing plate 21, the water injection air inlet hole 6, the fourth stop valve 18, the three-way joint 10, the third stop valve 15, the second air pressure control valve 13, the three-way joint 10 and the air pump 11 are connected in series through a conduit to form a water surface air pressure replenishing system, the water head pressure equivalent loading is realized by adjusting the second air pressure control valve 13, the third stop valve 15 and the fourth stop valve 18, the water inlet hole three-way joint 10, the third stop valve 15 and the water source 14 are connected in series through a conduit to form a water level, After the loading is finished, the rotary screw plug 33 at the lower part of the leveling support is opened to realize the smoothness of the prefabricated crack, the experiment starts to observe and record the experiment phenomenon, and after the experiment is finished, the soil pressure supplement plate is lifted by the air pump 11 through the air pressure reversal control valve 7, the first stop valve 8, the first air pressure control valve 9 and the three-way joint 10, so that the dismantling of the experiment model at this time is finished.
Fig. 2 shows an experimental method of an experimental apparatus for testing the water bursting and sand bursting start condition in the coal mining process according to the preferred embodiment of the present invention, which includes:
step S201, the leveling support 33 is adjusted to make the bottom plate 2 in a horizontal state.
Step S202, the bedrock test piece 22 is placed in a shallow groove in the center of the bottom plate 2, an outlet at the lower end of the fracture channel 19 is positioned in an opening area of the bottom plate 2, and sealant is applied to a contact part of the upper edge of the shallow groove and the surface of the bedrock test piece 22 to prevent lateral sand from flowing out along the bottom plate.
And step S203, connecting a lead at the upper end of the fracture channel 19 with the sensor 20, and connecting a lead at the lower end with the collector 1. And seals off the central opening of the bottom plate 2.
Step S204, the clamping groove of the bottom plate 2 for placing the transparent acrylic barrel 3 is cleaned, and the embedded O-shaped ring 28 and the flat O-shaped ring 29 are arranged in the clamping groove.
Step S205, filling dry sand in the fractured channel 19, and placing fine colored round particles on the upper surface of the channel for marking and timing.
Step S206, the acrylic barrel 3 is placed in the clamping groove of the bottom plate 2.
Step S207, filling caulking sand 23 into the gap between the bedrock test piece 22 and the acrylic barrel 3, and tamping the crack by a metal thin rod along the gap. And filling an clay layer 24 corresponding to the experimental scheme above the bedrock test piece 22, filling a sand layer 25 with required thickness and mixed according to the proportion after compacting and leveling, and compacting and leveling.
In step S208, the flat O-ring 29 and the flange piece 30 are assembled with the base plate 2 and fixed by the external support screw 31 and the nut 32. After four external support screws 31 are assembled on the lower portion of the device, the clamping grooves of the top cover 2 are assembled from bottom to top according to the sequence of the flange plate 30, the flat O-shaped ring and the top cover 4, and the clamping grooves of the top cover 2 are matched with the acrylic barrel 3. The air tightness requirement inside the equipment is realized by adjusting the nut 32.
Step S209, closing the first stop valve 8 and the second stop valve 12, starting the air pump 11, obtaining continuous and stable experimental air pressure by adjusting the first air pressure control valve 9, adjusting the hand-pulling valve 7 to a state that the air cylinder 5 extends outwards after the pressure is stabilized, opening the first stop valve 8, compacting the sand layer 25 by the soil pressure supplementing plate 21 connected with the front section of the telescopic rod of the air cylinder 5, and achieving the purpose of supplementing experimental soil pressure in the simulation engineering practice.
And step S210, detaching the second quick connector 17, opening the third stop valve 15 and the fourth stop valve 18, and injecting water into the experimental equipment to the experimental design height through the water injection air inlet hole 6 by using the water source 14.
And S211, connecting the second quick connector 17 again, closing the third stop valve 15 and the fourth stop valve 18, opening the second stop valve 12, adjusting the pressure reducing valve B13, opening the fourth stop valve 18 after the required numerical air pressure is continuously stable, and simulating the actual water head height of the engineering through the action of the air pressure on water.
And step S212, standing, and carrying out data and phenomenon record acquisition preparation work.
Step S213, removing the hole plug in the center of the bottom plate 2, and starting the experiment.
Step S214, after the experiment is completed, the soil pressure is supplemented to the plate 21 through the air pressure reversal control valve 7, the first stop valve 8, the first air pressure control valve 9, the three-way joint 10 and the air pump, and the detachment of the experiment model is completed.
The pressure load of the soil pressure supplement plate is obtained by calculation according to the thickness of a loose layer, the water-containing thickness of the bottom of the loose layer, the dry density of a sand body of the loose layer and the saturation density of the sand body of the loose layer, wherein the actual pressure load borne by a sand body unit at the bottom of the loose layer in a field project is that Preal rho dry soil gH is dry and rho saturated soil gH is saturated, the soil pressure supplement plate is a circular rigid sieve tray, the soil pressure is uniformly applied without blocking the water, the air pressure required to be supplemented in a cylinder in a simulation experiment process is that Preal × r2 plate/r 2 cylinder is supplemented, the pressure value of the soil pressure supplement is calculated according to the height of the actual water head involved in the field project, the calculation method is that Pwater rho gH water head, the Pwater supplement is Pwater-rho water gH water layer, the soil pressure supplement plate and the water head height supplement pump are unified as external connection sources, the pressure value is specifically adjusted by an air pressure control valve, the actual loose layer bottom sand body is the loose layer, the upper part of the loose layer reaches the upper part of the dry layer, the water pressure of the soil is the water pressure of the soil in the field is the soil supplement plate, the actual water pressure supplement, the soil supplement plate, the actual water pressure supplement plate, the water pressure of the soil in the water-saturated soil in the field is the water-saturated soil, the water-saturated soil in the water-saturated pressure supplement plate, the water-saturated soil in the field.
The water pressure sensor and the water pressure information collector are connected through a connecting wire, the connecting wire is required to be built into concrete in the process of prefabricating the bedrock test piece, in the installation process before the experiment begins, the water pressure sensor is required to be installed at a position 5cm above a fracture channel opening of the bedrock test piece and deviates 10cm right above the fracture channel opening, and therefore the situation that the water pressure sensor is directly immersed in water and cannot collect pore water pressure due to the fact that substances on the lower portion of a sand body are lost in the experiment process is prevented.
Up to this point, the present embodiment has been described in detail with reference to the accompanying drawings. From the above description, those skilled in the art should have clear understanding of the experimental apparatus for testing the water bursting and sand bursting start condition in the coal mining process of the present invention. The utility model discloses a true simulation of on-spot flood peak height, the true simulation of the original stress state of on-spot unconsolidated formation bottom sand body unit has been realized, the indoor calamity process simulation of coal face bursting water sand burst accident has been realized, can develop quantitative research and calamity aassessment to the bursting water sand burst disaster to different on-the-spot engineering circumstances through the indoor experiment, can develop systematic experimental study to bursting water sand burst disaster starting condition, thereby can realize effective collection for the calamity early warning to the change information of bursting water pore water pressure before bursting water sand burst disaster's the start-up provides the foundation, for bursting water sand disaster's prevention and control provides the reason foundation, in order to prevent economic loss, improve the security of mining environment in the pit.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. The utility model provides an experimental apparatus for test coal mining in-process bursting water sand bursting start condition, its characterized in that includes: the device comprises a containing cavity for containing an experimental sample, a soil pressure equivalent supply system which is connected with the containing cavity and provides the experimental sample in the containing cavity with the in-situ pressure equivalent loading of the unconsolidated formation soil body, a water level loading system which is connected with the containing cavity and supplies water into the containing cavity, and a water surface air pressure supply system which is connected with the containing cavity and provides the containing cavity with the water head pressure equivalent loading;
the device is characterized in that a bedrock test piece (22) which is placed at the bottom of the experimental sample and is provided with a fracture channel (19) is arranged in the accommodating cavity, a water pressure sensor (20) which is in communication connection with the water pressure information collector (1) is arranged on the upper portion of the bedrock test piece (22), an opening area which can be opened and closed is arranged at the bottom of the accommodating cavity, and an outlet at the lower end of the fracture channel (19) is located in the opening area.
2. The experimental device for testing the water bursting and sand bursting starting conditions in the coal mining process according to claim 1, wherein the accommodating cavity comprises: the bedrock test piece is placed on the base (2), an outlet at the lower end of the fracture channel (19) is located in the hole forming area, a rotary plug screw (33) is arranged in the hole forming area, the barrel body (3) is sleeved on the bedrock test piece and erected on the base (2), and the top cover (4) is installed on the upper portion of the barrel body (3);
the soil pressure equivalent replenishment system is provided with a soil pressure replenishment plate (21) which penetrates through the top cover (4) and provides in-situ pressure equivalent loading of the unconsolidated formation soil body for the experimental sample in the barrel body (3);
and a water injection air inlet (6) for supplying water surface air pressure supply system to provide water head pressure equivalent loading for the experimental sample of the barrel body (3) is arranged on the top cover (4).
3. The experimental device for testing the water bursting and sand bursting starting conditions in the coal mining process as claimed in claim 2, wherein the water pressure information collector (1) is in communication connection with the water pressure sensor (20) through a communication line embedded in the bedrock test piece.
4. The experimental device for testing the water bursting and sand bursting starting conditions in the coal mining process as claimed in claim 2, wherein a groove is formed in the base (2), the barrel body (3) is arranged on the groove, and a sealing member (28) is arranged between the barrel body (3) and the groove.
5. The experimental device for testing the water bursting and sand bursting starting conditions in the coal mining process as claimed in claim 2, wherein caulking sand (23) is filled between the barrel body (3) and the bedrock test piece (22).
6. The experimental device for testing the water bursting and sand bursting starting conditions in the coal mining process according to claim 2, wherein the accommodating cavity further comprises a leveling support (34) arranged below the base (2).
7. The experimental device for testing the starting conditions of water bursting and sand bursting in the coal mining process according to claim 2, wherein the soil pressure equivalent replenishing system further comprises: the soil pressure compensating device comprises an air pump (11), a first air pressure control valve (9), a first stop valve (8), an air pressure reversal control valve (7) and an air cylinder (5), wherein a telescopic rod of the air cylinder (5) is connected with a soil pressure supplementing plate (21).
8. The experimental device for testing the water bursting and sand bursting starting conditions in the coal mining process according to claim 7, wherein the water level loading system comprises: a water source (14), and a third shut-off valve (15), the third shut-off valve (15) being in communication with the water injection inlet aperture (6).
9. The experimental device for testing the starting conditions of water bursting and sand bursting in the coal mining process according to claim 8, wherein the water surface air pressure supply system comprises: the air pump (11) with three way connection (10), first quick-operation joint (16), second quick-operation joint (17) and fourth stop valve (18) between first air pressure control valve (9) set up, three way connection (10) are through second air pressure control valve (13), second stop valve (12) and second quick-operation joint (17) intercommunication, third stop valve (15) in proper order with first quick-operation joint (16) and fourth stop valve (18) intercommunication, first quick-operation joint (16) with second quick-operation joint (17) can dismantle the connection.
10. The experimental device for testing the water bursting and sand bursting start-up conditions in the coal mining process as claimed in claim 2, wherein the soil pressure supplement plate (21) is a rigid sieve tray.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579406A (en) * | 2019-10-17 | 2019-12-17 | 神华神东煤炭集团有限责任公司 | Experimental device and method for testing water bursting and sand bursting starting conditions in coal mining process |
| CN116625770A (en) * | 2023-05-26 | 2023-08-22 | 中国矿业大学(北京) | Device and method for researching micro-cracks in deep coal mining subsidence area |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579406A (en) * | 2019-10-17 | 2019-12-17 | 神华神东煤炭集团有限责任公司 | Experimental device and method for testing water bursting and sand bursting starting conditions in coal mining process |
| CN110579406B (en) * | 2019-10-17 | 2024-10-22 | 神华神东煤炭集团有限责任公司 | Experimental device and method for testing water and sand bursting starting conditions in coal mining process |
| CN116625770A (en) * | 2023-05-26 | 2023-08-22 | 中国矿业大学(北京) | Device and method for researching micro-cracks in deep coal mining subsidence area |
| CN116625770B (en) * | 2023-05-26 | 2023-11-28 | 中国矿业大学(北京) | Device and method for researching micro-cracks in deep coal mining subsidence area |
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