CN110985124A - Experimental device for fixed-point quantitative dynamic monitoring system for progressive lifting of coal seam floor - Google Patents
Experimental device for fixed-point quantitative dynamic monitoring system for progressive lifting of coal seam floor Download PDFInfo
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Abstract
The invention discloses an experimental device of a coal seam floor progressive leading fixed point quantitative dynamic monitoring system, which is characterized in that the monitoring system comprises a constant-pressure pressurizing device, a progressive leading fixed point quantitative observation device, a water guide quantity quantitative acquisition device and a stress detection system. Stress data and water flow change data acquired in the test process of the test device are combined with the development state of the bottom plate crack, the simulation of bottom plate crack development and progressive guided lifting cooperative water inrush under the influence of mining is realized by integrating four functions of constant-pressure water injection, fixed-point observation, water flow quantitative acquisition and stress multi-azimuth detection, and the time-space evolution law between the bottom plate damage and progressive guided lifting cooperative water inrush mechanism is disclosed; through the data analysis of stress measuring points arranged in the fault area, along with the different activation degrees of the faults propelled by the working face, the pressure-bearing water guide height is increased along with the continuous release of the stress of the bottom plate rock mass, and the relation between the unloading degree of the bottom plate rock mass and the water yield of the monitoring pipe is observed.
Description
Technical Field
The invention relates to an experimental device of a coal seam floor progressive lead-up fixed point quantitative dynamic monitoring system, in particular to an experimental device of a coal seam floor progressive lead-up fixed point quantitative dynamic monitoring system.
Background
Coal mine floor water inrush accidents frequently occur, the harm degree is even more serious, the loss caused by the economy of the country and the personal safety of people always stays at the head of each large coal mine accident, most of the water inrush accidents occur on a stope, and the water inrush caused by faults accounts for more than 80% of the total water inrush, so that the influence of the faults on the water inrush effect is a great difficult problem in coal production. A great amount of tests and theoretical researches are carried out by the predecessors on fault water inrush prediction, treatment technology and the like, and due to the fact that the fracture structures of coal seam floors are different, the mechanism of the water inrush of the floors obtained by researchers is different. Under the condition of solid-liquid coupling, the progressive lifting guide fixed-point quantitative dynamic monitoring of the coal seam floor is difficult to realize by researching the water inrush mechanism of the coal seam floor, the similar simulation of the fluid-solid coupling problem is complex, the requirement on similar materials is high, and the materials and the original rock must simultaneously meet the requirements of solid deformation and permeability similarity. The prior similar material mainly takes sand, calcium carbonate and gypsum as main components, is easy to disintegrate in water and is not enough to be applied to a fluid-solid coupling similar simulation test.
In the invention
The invention aims to provide an experimental device of a coal seam floor progressive guided lifting fixed point quantitative dynamic monitoring system, wherein stress data and water flow change data acquired in the experimental process of the experimental device are combined with the development state of a floor crack, and the simulation of floor crack development and progressive guided lifting cooperative water inrush under the influence of mining by adopting four-in-one of constant-pressure water injection, fixed point observation, water flow quantitative acquisition and stress multi-azimuth detection is adopted, so that the failure and progressive guided lifting cooperative water inrush mechanism of a stope floor and the space-time evolution rule between the failure and progressive guided lifting cooperative water inrush mechanism are disclosed; through the data analysis of stress measuring points arranged in the fault area, along with the different activation degrees of the faults propelled by the working face, the pressure-bearing water lifting height is increased along with the continuous release of the stress of the bottom plate rock mass, the relation between the unloading degree of the bottom plate rock mass and the water yield of the monitoring pipe is observed, and the water bursting mechanism process is more intuitively and progressively guided and is cooperated with the pressure-bearing water lifting; the simulation of the bottom plate crack development and the progressive guided lifting cooperative water inrush under the mining influence is realized, the fixed-point quantitative dynamic monitoring of the bottom plate in the working face stoping process is realized, and the stope bottom plate damage and progressive guided lifting cooperative water inrush mechanism and the spatial and temporal evolution rule between the stope bottom plate damage and the progressive guided lifting cooperative water inrush mechanism are disclosed.
The purpose of the invention can be realized by the following technical scheme:
a coal seam floor progressive guide lifting fixed point quantitative dynamic monitoring system experimental device comprises a constant-pressure pressurizing device, a progressive guide lifting fixed point quantitative observation device, a water guide quantity quantitative acquisition device and a stress detection system.
The monitoring system is used for a coal seam floor hidden fault progressive leading fixed point quantitative dynamic monitoring process, the constant-pressure pressurizing device is used for pressurizing by injecting air into the pressurizing tank after adding water into the pressurizing tank, and the constant-pressure stability of the floor progressive leading fixed point quantitative dynamic monitoring system device is guaranteed.
The fixed point quantitative observation device for progressive lifting guide is provided with expansion flexible hoses at different positions, so that progressive lifting guide positions can be dynamically seen.
The water guide quantity quantitative acquisition device leads the observation pipe out of the position where the expansion flexible hose is arranged to the metering container, and the water guide quantity quantitative acquisition is realized.
The dynamic observation pipe is arranged below the coal seam, the stress detection system is provided with stress measuring points at the peripheries of the coal seam floor, the hidden fault and the dynamic observation pipe along the working face trend model, the change rule of the coal seam floor stress in the mining process is reflected and analyzed, and the simulation of the floor crack development and the progressive guided lifting cooperative water inrush under the mining influence by four functions of constant-pressure water injection, fixed-point observation, water diversion quantitative acquisition and stress multi-directional detection is realized.
A first water bag is arranged below the dynamic observation tube, and a second water bag is communicated with the first water bag.
Furthermore, the pressurizing tank is filled with water firstly and then filled with air to play a role in maintaining the pressure, a pressure gauge is arranged above the pressurizing tank to display the water pressure, one end of the pressurizing tank, which is provided with a high-pressure water injection pipe, of the high-pressure water injection pipe is connected with the first water bag, and the other end of the pressurizing tank is connected with the pressurizing tank.
Furthermore, the first water sac simulates confined water, the second water sac simulates a hidden fault, the first water sac and the second water sac are communicated, a rock layer is arranged on the coal layer, the upper part of the hidden fault is respectively provided with three branches to replace different hidden cracks of the hidden fault, the hidden cracks are respectively a crack with an angle of 30 degrees, a crack with an angle of 60 degrees and a crack with an angle of 90 degrees, the branches are respectively replaced by hoses, a first dynamic observation pipe, a second dynamic observation pipe and a third dynamic observation pipe are arranged on the 90-degree crack, a fourth dynamic observation pipe and a fifth dynamic observation pipe are arranged on the 60-degree crack, a sixth dynamic observation pipe and a seventh dynamic observation pipe are arranged on the 30-degree crack, the dynamic observation pipes are expandable flexible hoses, the initial state is closed, and in the advancing process of the working face, the bottom plate of the coal layer is under the combined action of mine pressure and water pressure to form the superposition of a stress field and a water pressure field, so that the initial state, and then water filling is carried out, when the position of the dynamic observation pipe is reached, the observation pipe flows out, the development of the layer position bottom plate crack is shown, the guiding and lifting height of the pressure-bearing water in the bottom plate is obtained, and the progressive guiding and lifting phenomenon is generated, so that the progressive guiding and lifting position is dynamically seen.
Furthermore, a collection pipe is communicated with the dynamic observation pipe, one end of the collection pipe is communicated with the dynamic observation pipe, the other end of the collection pipe is communicated with a water quantity measurer, a quantitative water quantity collection pipe is led out from the first dynamic observation pipe, the second dynamic observation pipe, the third dynamic observation pipe, the fourth dynamic observation pipe, the fifth dynamic observation pipe, the sixth dynamic observation pipe and the seventh dynamic observation pipe and is respectively connected with the water quantity measurer, a water valve and an automatic water quantity meter are connected onto the quantitative water quantity collection pipe, wherein the automatic water quantity meter automatically meters the flow of water, a coal seam floor forms superposition of stress field and water pressure field under the combined action of mine pressure and water pressure in the advancing process of a working face, the development of floor fractures at different positions is analyzed according to the size of the flow, the simulation of the development of the floor fractures under the influence of mining and progressive guided lifting in cooperation with water inrush is realized through experiments, the fixed-point quantitative dynamic monitoring of the bottom plate in the stoping process of the working face is realized, and the damage and progressive guided-rise cooperative water inrush mechanism of the stope bottom plate and the spatial and temporal evolution rule between the stope bottom plate and the progressive guided-rise cooperative water inrush mechanism are disclosed.
Further, reflecting and analyzing the change rule of the stress of the coal seam floor in the mining process, arranging stress measuring points on the peripheries of the coal seam floor, the hidden fault and the dynamic observation pipe along the working face trend model, and adopting a high-sensitivity photoelectric strain gauge, thereby establishing a similar prediction point for water inrush caused by the damage and progressive lifting of the coal mining stope floor rock stratum on the pressure water, and analyzing the data according to the stress measuring points arranged in the fault area.
The invention has the beneficial effects that:
1. stress data and water flow change data acquired in the test process of the test device are combined with the development state of the bottom plate crack, the simulation of bottom plate crack development and progressive guided lifting cooperative water inrush under the influence of mining is realized by integrating four functions of constant-pressure water injection, fixed-point observation, water flow quantitative acquisition and stress multi-azimuth detection, and the time-space evolution law between the bottom plate damage and progressive guided lifting cooperative water inrush mechanism is disclosed;
2. according to the test device, through the data analysis of stress measuring points arranged in the fault area, along with the different activation degrees of the faults propelled by the working face, the pressure-bearing water guide height is increased along with the continuous release of the stress of the bottom plate rock mass, the relation between the unloading degree of the bottom plate rock mass and the water yield of the monitoring pipe is observed, and the water inrush mechanism process is more intuitively and progressively guided and lifted;
3. the test device provided by the invention realizes the simulation of the crack development and progressive guided lifting cooperative water inrush of the bottom plate under the influence of mining, realizes the fixed-point quantitative dynamic monitoring of the bottom plate in the working face extraction process, and reveals the stope bottom plate damage and progressive guided lifting cooperative water inrush mechanism and the spatial and temporal evolution rule between the stope bottom plate damage and the progressive guided lifting cooperative water inrush mechanism.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic view of the experimental apparatus of the monitoring system of the present invention;
FIG. 2 is a schematic view of a part of the experimental apparatus of the monitoring system of the present invention;
FIG. 3 is a schematic structural diagram of a water guide quantity quantitative collecting device according to the present invention;
fig. 4 is a schematic structural diagram of a stress detection system according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An experimental device of a coal seam floor progressive leading fixed point quantitative dynamic monitoring system is shown in figures 1 and 2, and the monitoring system comprises a constant-pressure pressurizing device, a progressive leading fixed point quantitative observation device, a water guide quantity quantitative acquisition device and a stress detection system.
Firstly, the model frame is arranged, the guard plate is firmly installed, and the two ends of the guard plate are provided with the laying scale lines, so that the model laying process is accurate. Laying a first water bag 7 of L8 limestone high-strength flexible polyurethane at the fifth layer, and laying a second water bag 5 of the high-strength flexible polyurethane at the hidden layer. After the water sac is laid, a material with a similar proportion is laid on the upper part of the water sac, the water sac is tightly vibrated and compacted, and after standard maintenance, the water sac is pre-pressurized by a pressurizing pump 9 to test the tightness of the water sac. Stress patch sensors are deployed at the paved rock 13 according to the design. Each time, a layer is paved, weak surfaces (flake mica powder) are used for separating the layers, and mica powder with the thickness of 1-2mm is covered on each layer of the layer in a layered mode to simulate the bedding of a rock stratum 13. And after the model is made, maintaining for 5-7 days to perform the test. The water outlet of the pressurizing device is connected with a water bag water inlet pipeline, and coal bed 3 mining is carried out according to a design scheme, so that similar simulation of water inrush caused by the fact that the floor rock stratum 13 of the pressure-bearing water coal mining stope is damaged and is gradually guided and lifted is built, along with different activation degrees of the advancing faults of the working face, the pressure-bearing water guide height is increased along with continuous release of the floor rock stress, the relation between the unloading degree of the floor rock and the water outlet quantity of the monitoring pipe is observed, and the water inrush mechanism process is cooperated with gradual guide and lifting.
Examples
The pressure-bearing water loading system mainly comprises a first water bag 7 made of L8 limestone high-strength flexible polyurethane, a second water bag 5 made of concealed fault layer high-strength flexible polyurethane and a pressurizing device. The first water bag 7 made of high-strength flexible polyurethane after water injection can better share the upper load while keeping certain flexibility. The two ends of the water bag are sealed by high-strength synthetic glue, the middle opening of the first water bag 7 is communicated with the second water bag 5 of the hidden fault high-strength flexible polyurethane, as shown in figure 1, the right end of the water bag is a water injection port, and the pressure-bearing water of the bottom plate is ensured to be consistent with the water pressure of the fault. The dip angle of the hidden fault is 45 degrees, the second water sac 5 of the embedded fault replaces the function of the AoBu water in advance, and the maximum guide height is 15 cm. In the test, in the process of working face mining, cracks appear at the bottom plate part of a coal seam 3, a dynamic observation pipe 4 is arranged below the coal seam 3, pressure-bearing water is guided to rise and flows out of the dynamic observation pipe 4, the pressure of a water sac is reduced, a water outlet of a pressurizing water pump is connected with water inlets of a first water sac 7 and a second water sac 5, an automatic pressure supplementing and maintaining function of a pressurizing device can be maintained at a set value, the water pressure of a certain mine is 5.0-5.3 MPa, the pressure required by the test is 0.03MPa through calculation, the water pressure of the water sac is guaranteed to be constant, and a sensor numerical display can monitor the applied pressure in real time.
The first water bag 7 is used for simulating confined water, the second water bag 5 is used for simulating a hidden fault, and the first water bag and the second water bag are in through connection. In order to simulate the essential change process of the process of water inrush caused by the destruction of the stope floor rock layer 13 and the gradual lifting in a more dynamic and similar way. Three branches are respectively arranged at the upper part of the hidden fault to replace different hidden cracks of the hidden fault, for the convenience of research, the hidden crack with the angles of 30 degrees of cracks 16, 60 degrees of cracks 15 and 90 degrees of cracks 14 is respectively replaced by hoses, the 90 degrees of cracks 14 are provided with a first dynamic observation pipe 410, a second dynamic observation pipe 401 and a third dynamic observation pipe 402, the 60 degrees of cracks 15 are provided with a fourth dynamic observation pipe 403 and a fifth dynamic observation pipe 404, the 30 degrees of cracks 16 are provided with a sixth dynamic observation pipe 405 and a seventh dynamic observation pipe 406, the dynamic observation pipe 4 adopts an expandable flexible hose, the initial state is closed, in the advancing process of a working surface, the bottom plate of the coal seam 3 forms the superposition of a stress field and a water pressure field under the combined action of mine pressure and water pressure, so that the flexible riser pipe is expanded first when the initial state is closed, then water filling is carried out, and when the position of the dynamic observation pipe is reached, and observing the outflow of the water of the pipe, showing the development of the crack of the bottom plate at the position, obtaining the ascending height of the pressure-bearing water in the bottom plate, generating a progressive ascending phenomenon, and dynamically seeing the progressive ascending position.
The quantitative water collection tube 6 is led out from the first dynamic observation tube 410, the second dynamic observation tube 401, the third dynamic observation tube 402, the fourth dynamic observation tube 403, the fifth dynamic observation tube 404, the sixth dynamic observation tube 405 and the seventh dynamic observation tube 406 and respectively connected to the water measurer 12, the quantitative water collection tube 6 is connected with the water valve 17 and the automatic water meter 18, and the automatic water meter 18 automatically meters the flow of water. In the working face advancing process, the bottom plate of the coal seam 3 forms superposition of a stress field and a water pressure field under the combined action of mine pressure and water pressure, the development of the bottom plate cracks at different positions can be analyzed according to the flow, the simulation of the bottom plate crack development and progressive guided lifting cooperative water inrush under the mining influence is realized through experiments, the fixed-point quantitative dynamic monitoring of the bottom plate in the working face mining process is realized, and the mining face bottom plate damage and progressive guided lifting cooperative water inrush mechanism and the space-time evolution rule between the mining face bottom plate damage and progressive guided lifting cooperative water inrush mechanism are disclosed.
In order to reflect and analyze the change rule of the floor stress of the coal seam 3 in the mining process, stress measuring points 11 are arranged on the peripheries of the floor of the coal seam 3, a hidden fault and a dynamic observation pipe 4 along a working face trend model, a high-sensitivity photoelectric strain gauge is adopted, so that a similar prediction point of water inrush caused by the fact that the floor rock 13 of a coal mining stope on the pressure-bearing water is damaged and is gradually guided to rise is built, data analysis is carried out according to the stress measuring points 11 arranged in the fault area, along with the fact that the activation degree of the fault is pushed by the working face is different, the pressure-bearing water guiding height is increased along with the continuous release of the floor rock stress, the relation between the unloading degree of the floor rock and the water yield of the monitoring pipe is observed, and.
In order to intuitively research the cooperative law of the crack development and progressive leading of the bottom rock stratum 13, the work of excavation of a working surface, recording of the damage phenomenon of the bottom slab, photographing and the like are carried out simultaneously. The length of a working face of the model is 200cm, in order to avoid the influence of a boundary effect on the test effect of the coal seam 3 during mining, excavation is carried out from the left to the right of the model, the opening hole 1 is taken as a protective coal pillar 50cm away from the boundary, the width of the opening hole 1 is 10cm, the rightmost 50cm is taken as the protective coal pillar, the 10cm is taken as an excavation footage, 20 times of excavation are carried out totally, 200cm of excavation is carried out totally, 2h after each excavation is carried out, one record is observed, particularly, the observation is carried out on 13 fracture development of a bottom plate rock stratum, a hidden fault and a hidden fracture key area, and along with the excavation process of the working face, the development law of the bottom plate fracture of the coal seam. The characteristic of overburden failure caused by face extraction, the damage influence on fault zones and the condition of guided lifting of confined water in the fault zones. In the experimental process, the pressure values of the first water bag 7 and the second water bag 5 are checked, and the water pressure of the water bags simulating the fault water filling pressure is ensured to be constant. According to the design scheme, the model is gradually excavated, and the characteristics of the stope floor rock stratum 13 fracture and progressive lifting cooperative rule can be analyzed.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (5)
1. The experimental device of the coal seam floor progressive guided lifting fixed point quantitative dynamic monitoring system is characterized in that the monitoring system comprises a constant-pressure pressurizing device, a progressive guided lifting fixed point quantitative observation device, a water guide quantity quantitative acquisition device and a stress detection system;
the monitoring system is used for the progressive fixed-point quantitative dynamic monitoring process of the hidden fault of the bottom plate of the coal seam (3), the constant-pressure pressurizing device is used for maintaining the pressure by adding water into the pressurizing tank (9) and then injecting air, and the constant pressure of the progressive fixed-point quantitative dynamic monitoring system device of the bottom plate is ensured to be stable;
the progressive guided-lifting fixed-point quantitative observation device is provided with expansion flexible hoses at different positions, so that progressive guided-lifting positions can be dynamically seen;
the water-conducting quantitative acquisition device leads an observation tube out of the position where the expansion flexible hose is arranged to a metering container to realize the quantitative acquisition of the water-conducting quantity;
a dynamic observation pipe (4) is arranged below the coal seam (3), stress measuring points (11) are arranged on the peripheries of the coal seam (3) bottom plate, the hidden fault and the dynamic observation pipe (4) of the stress detection system along the working face trend model, the change rule of the coal seam (3) bottom plate stress in the mining process is reflected and analyzed, and the simulation of bottom plate crack development and progressive guided lift coordinated water inrush under the mining influence of four integration of constant-pressure water injection, fixed-point observation, water diversion quantitative acquisition and stress multi-azimuth detection is carried out;
a first water bag (7) is arranged below the dynamic observation tube (4), and a second water bag (5) is communicated with the first water bag (7).
2. The experimental device of the quantitative and dynamic monitoring system for the coal seam floor progressive guide lifting fixed point according to claim 1, wherein a pressure gauge (10) is arranged above the pressurizing tank (9) by adding water and injecting air into the pressurizing tank (9) to display water pressure, one end of the pressurizing tank (9) provided with a high-pressure water injection pipe (8) and a high-pressure water injection pipe (8) is connected with the first water sac (7), and the other end of the pressurizing tank (9) is connected with the first water sac (7).
3. The experimental device of the quantitative and dynamic monitoring system for the coal seam floor progressive lifting fixed points is characterized in that the first water sac (7) simulates confined water, the second water sac (5) simulates hidden faults and is in through connection with the hidden faults, a rock layer (13) is arranged on the coal seam (3), three branches are respectively arranged at the upper part of each hidden fault to replace different hidden faults of each hidden fault, the hidden faults are respectively hidden fractures (16, 15 and 14) with angles of 30 degrees and are respectively replaced by hoses, a first dynamic observation pipe (410), a second dynamic observation pipe (401) and a third dynamic observation pipe (402) are arranged on each 90-degree fracture (14), a fourth dynamic observation pipe (403) and a fifth dynamic observation pipe (404) are arranged on each 60-degree fracture (15), a sixth dynamic observation pipe (405) and a seventh dynamic observation pipe (406) are arranged on each 30-degree fracture (16), the dynamic observation pipe (4) adopts an expansion flexible hose, the initial state is closed, in the process of advancing a working face, the floor of the coal seam (3) is overlapped with a stress field and a water pressure field under the combined action of mine pressure and water pressure, so that the initial state of the flexible guiding pipe is closed, expansion occurs first, then water filling occurs, when the position of the dynamic observation pipe (4) is reached, the observation pipe flows out, the development of the floor crack of the position is shown, the guiding height of pressure-bearing water in the floor is obtained, and the progressive guiding position is dynamically seen when a progressive guiding phenomenon occurs.
4. The experimental device of the coal seam floor progressive guided lifting fixed point quantitative dynamic monitoring system according to claim 1, wherein a collection pipe (6) is communicated with the dynamic observation pipe (4), one end of the collection pipe (6) is communicated with the dynamic observation pipe (4), the other end of the collection pipe is communicated with a water quantity measurer (12), the first dynamic observation pipe (410), the second dynamic observation pipe (401), the third dynamic observation pipe (402), the fourth dynamic observation pipe (403), the fifth dynamic observation pipe (404), the sixth dynamic observation pipe (405) and the seventh dynamic observation pipe (406) lead out quantitative water quantity collection pipes (6) to be respectively connected to the water quantity measurer (12), a water valve (17) and an automatic water quantity meter (18) are connected to the quantitative water quantity collection pipes (6), wherein the automatic water quantity meter (18) automatically meters the flow quantity of water, and in the process of working face propulsion, the coal seam (3) bottom plate forms the superposition of a stress field and a water pressure field under the combined action of mine pressure and water pressure, the development of bottom plate cracks at different positions is analyzed according to the flow, the simulation of the bottom plate crack development and progressive guided lifting cooperative water inrush under the influence of mining is realized through experiments, the fixed-point quantitative dynamic monitoring of the bottom plate in the working face mining process is realized, and the failure and progressive guided lifting cooperative water inrush mechanism of the bottom plate of the mining field and the space-time evolution rule between the failure and progressive guided lifting cooperative water inrush mechanism are disclosed.
5. The experimental device of the quantitative and dynamic monitoring system for the progressive guided lifting fixed points of the coal seam floor as claimed in claim 1, wherein the change rule of the stress of the coal seam floor (3) in the mining process is reflected and analyzed, stress measuring points (11) are arranged on the peripheries of the coal seam floor (3), the hidden fault and the dynamic observation tube (4) of the working face trend model, high-sensitivity photoelectric strain gauges are adopted, so that a similar prediction point of water inrush caused by the damage of the floor strata (13) of the coal mining stope on the pressure water and the progressive guided lifting together is built, and data analysis is carried out according to the stress measuring points (11) arranged in the fault area.
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| CN201911335133.3A CN110985124A (en) | 2019-12-23 | 2019-12-23 | Experimental device for fixed-point quantitative dynamic monitoring system for progressive lifting of coal seam floor |
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| CN201911335133.3A CN110985124A (en) | 2019-12-23 | 2019-12-23 | Experimental device for fixed-point quantitative dynamic monitoring system for progressive lifting of coal seam floor |
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