CN108956931A - A kind of coal and gas prominent centrifugal model test devices and methods therefor - Google Patents
A kind of coal and gas prominent centrifugal model test devices and methods therefor Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 151
- 238000012360 testing method Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000001133 acceleration Effects 0.000 claims abstract description 18
- 239000011435 rock Substances 0.000 claims abstract description 15
- 239000003034 coal gas Substances 0.000 claims abstract description 14
- 125000006850 spacer group Chemical group 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 4
- 238000002347 injection Methods 0.000 claims description 18
- 239000007924 injection Substances 0.000 claims description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 15
- 238000000605 extraction Methods 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 14
- 239000004576 sand Substances 0.000 claims description 12
- 239000002817 coal dust Substances 0.000 claims description 11
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000006004 Quartz sand Substances 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 229910052602 gypsum Inorganic materials 0.000 claims description 3
- 239000010440 gypsum Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims 1
- 238000005119 centrifugation Methods 0.000 claims 1
- 230000007246 mechanism Effects 0.000 abstract description 10
- 230000005484 gravity Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 6
- 238000011160 research Methods 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
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- 238000004880 explosion Methods 0.000 description 4
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- 239000003344 environmental pollutant Substances 0.000 description 2
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- G—PHYSICS
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- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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Abstract
The present invention relates to a kind of coal and gas prominent centrifugal model test devices, and the method for carrying out Intensity of coal-gas burst prediction using the device.The device includes a centrifuge 101, ballast box 102, chamber 103, stratigraphic model case 3；Wherein successively layering setting from top to bottom in stratigraphic model case: rubber spacer 301, roof model 303, seals on coal seam and seals film 306, seat earth model 307 under film 304, coal seam model 305, coal seam overlying rock model 302；Each layer is made by actual formation situation by similitude material and drawdown ratio ruler.Due to the complexity of coal and gas prominent mechanism, also in continuing exploration, the calculation method of the Intensity of coal-gas burst based on various prominent mechanism hypothesis is also immature for the research of coal and gas prominent mechanism.This experimental provision can predict that the intensity of coal and gas prominent, structure are reliable in the coal and gas prominent process under the specific stratum gravity stress effect of specific centrifugal acceleration Imitating.
Description
Technical field
The present invention relates to coal mine underground exploitation coal and gas prominent quantification of intensities prediction and prevention and control fields, and in particular to a kind of
The determination method of coal and gas prominent centrifugal model test device and wherein design parameter.
Background technique
Coal and gas prominent is one of main mine disaster.Due to the complexity of coal and gas prominent mechanism, both at home and abroad
To the research of coal and gas prominent mechanism still in continuing exploration.Based on the intensity of outburst that various prominent mechanism hypothesis propose
Calculation method is also immature.Under these conditions, a kind of room that can predict colliery scene coal and gas prominent intensity of outburst is explored
Interior test method is of great significance.
Currently, the coal and gas prominent experimental rig developed both at home and abroad is mainly the qualitative analysis to intensity of outburst, it cannot
Carry out the quantitative forecast of the Intensity of coal-gas burst of colliery scene.Coal petrography amount outstanding can be from number when coal and gas prominent occurs
To the other scale of upper 10,000 tons, traditional laboratory test can not be simulated ton.
Geo-technical centrifuge is that the geotechnical model of minification is placed in high-speed rotating centrifuge, and model is allowed to bear
Greater than the effect of the centrifugal acceleration of acceleration of gravity, compensate because the self weight of model scale bring earth structure is lost.Mesh
Before, the centrifuge model test carried out both at home and abroad is mainly in stability of slope, deep basal pit and underground tunnel project, harbour and ocean
The simulation of the problems such as migration of engineering, explosion and impact load and Solid Waste Landfills pollutant.
Summary of the invention
The object of the invention is that provide to solve the above-mentioned problems one kind can to coal and gas prominent process into
The centrifugal device of row simulation test and the method for carrying out Intensity of coal-gas burst prediction using it.
The present invention through the following technical solutions to achieve the above objectives:
A kind of coal and gas prominent centrifugal model test device, including a centrifuge, ballast box, chamber, stratum mould
Molding box；
The ballast box and chamber are mounted on the symmetrical position of centrifuge by connecting shaft；
The chamber is identical as the counterweight box shape weight；
The chamber bottom plate of the chamber is bolted stratigraphic model bottom plate under passing through；
The bottom of the counterweight fixes a clump weight identical with stratigraphic model case weight；
The stratigraphic model case includes: stratigraphic model bottom plate, cover board, between stratigraphic model bottom plate and cover board
Cylindrical main tank, wherein main tank top edge is fixed by upper bolt with cover plate for sealing, stratigraphic model bottom plate by lower bolt with
Chamber bottom plate is connected and fixed；
Wherein rubber spacer is one layer of rubber, and overlying rock model is a closed box, bottom shape and main tank inner section
It is identical, steel sand or lead sand are filled in case, it is the sealing film for having deformability that sealing film under film, coal seam is sealed on coal seam, with master
Case constitutes a sealing area, and the coal seam model is made of coal dust and a small amount of binder, is filled in the sealing area；
Main tank is equipped with extraction valve, gas injection valve, exposed coal device at the model of coal seam, and the exposed coal device, which is one, to be had automatically
The fast ejector half sealed valve of open function, inside are connected to coal seam model.In proper timing, open exposed coal device will simulate coal with
Gas Outburst.
Further improvement lies in that: four sides and the bottom connection sealed to each other of the chamber are trickled down after preventing coal inrush.
Further improvement lies in that: the centrifuge is the controllable centrifuge of a velocity of rotation, and the exposed coal device is one
A fast ejector half sealed valve with countdown open function.It in this way can device for opening, simulation in the centrifugal acceleration of needs
The coal and gas prominent result of particular formation weight stress.
Further, the method for carrying out coal and gas prominent scale forecast using the present apparatus, is realized by following steps:
The method for carrying out coal and gas prominent scale forecast using the above coal and gas prominent centrifugal model test device,
It is characterized in that, comprising the following steps:
Step 1, each layer model in stratigraphic model case (3) is prepared,
Step 1-1 obtains colliery scene roof, bottom plate physical and mechanical parameter,
Step 1-2 prepares roof model and seat earth according to the coal seam top of measurement, bottom plate physical and mechanical parameter
Model, coal seam model coal dust and binder are prepared by a certain percentage, and roof and bottom plate model are using similitude material (weight
Spar powder, quartz sand, gypsum, glycerol, cement and water) it prepares by a certain percentage,
Step 1-3 obtains colliery scene coal seam and coal seam top, bottom plate actual (real) thickness,
Step 1-4, by coal seam and coal seam top, bottom plate actual (real) thickness multiplied byDetermine the thickness of each layer in model,
Step 1-5 is self-possessed according to model height, density and centrifugal acceleration three's product equal to roof overlying rock
The principle of stress prepares the height of overlying rock model and the loading of steel sand and lead sand,
Each layer is put into stratigraphic model case in order, selected the suitable rubber spacer of thickness (301), it is ensured that is each by step 1-6
Closed seamless gap between layer, and cover board is installed with bolt；
Step 2, the bore of exposed coal device is determined,
Step 2-1 obtains colliery scene exposed coal section bore；
Step 2-2, by colliery scene exposed coal section bore multiplied byThat is the bore of exposed coal device；
Step 3, position installation exposed coal device, extraction valve and the gas injection valve of coal seam model are corresponded in main tank wall；
Step 4-1 closes exposed coal device and gas injection valve, extracts the gas in the model of coal seam out by extraction valve,
Step 4-2 closes extraction valve, makes the gas in the model of coal seam to coal seam model injection testing gas by gas injection valve
Pressure reaches predetermined value,
Step 4-3: the countdown duration T of setting exposed coal device,
Step 4-4: starting centrifuge, and start countdown,
Step 4-5: after exposed coal device is opened, coal and gas prominent process terminates, and stops centrifuge movement, collects chamber
Interior coal dust and weighing；
Step 5-1: determining Intensity of coal-gas burst similar scale K according to the theory of similarity,
Step 5-2: the quality of pc in chamber is converted into multiplied by K the coal and gas prominent quality of pc of actual scene
That is Intensity of coal-gas burst.
Inventive principle: if centrifugal model obtains N times of acceleration of gravity, N times of size reduction of model and prototype
Weight stress ratio is equal to its density ratio, this is weight stress principle of similarity；According to boundary condition principle of similarity, stratum
The width of model is greater than 20 times of exposed coal device bore.
Geo-technical centrifuge is that the geotechnical model of minification is placed in high-speed rotating centrifuge, and model is allowed to bear
Greater than the effect of the centrifugal acceleration of acceleration of gravity, compensate because the self weight of model scale bring earth structure is lost.Mesh
Before, the centrifuge model test carried out both at home and abroad is mainly in stability of slope, deep basal pit and underground tunnel project, harbour and ocean
The simulation of the problems such as migration of engineering, explosion and impact load and Solid Waste Landfills pollutant.By the ground of minification
Layer model is placed in high-speed rotating centrifuge, and model is allowed to withstand greater than the effect of the centrifugal acceleration of acceleration of gravity.In this way,
For the stratigraphic model by gravity, it is assumed that when N times of size reduction of model bears N times of acceleration of gravity, it is believed that model is certainly
Weight stress is similar to prototype.Currently, the soil body and rock slope scale and crater body are predicted by centrifugal model test both at home and abroad
The research of product etc. obtains good effect.According to the likelihood relationship of centrifugal model, if centrifugal acceleration is N times of gravity
Acceleration, when prototype size reduces N times, then the explosion energy in model is the N of prototype3Times.Wales university of Britain passes through a system
Column centrifugal model test has studied influence of the underground explosion to underground structure, to the research table of crater shape in centrifugal model
Bright, gained crater volume connects very much with the empirical equation prediction result obtained according to field test observation in model test
Closely.
Coal and gas prominent is coal seam property, crustal stress (including weight stress, tectonic stress and mining induced stress) and gas
Three factor interaction of pressure as a result, the present invention provides a kind of coal that can study above-mentioned three factor interaction and gas are prominent
Physical model out.The present invention makes the stratigraphic model of diminution according to than ruler relationship according to the stratum actual (real) thickness of colliery scene,
The physical and mechanical parameter of each stratigraphic model is prepared referring to the physical and mechanical parameter of actual formation according to the likelihood ratio；Close gas injection valve and
Exposed coal device extracts the air in the model of coal seam, injection testing gas out, and the air pressure of coal seam model is made to reach predetermined value；Starting
Centrifuge, when centrifugal acceleration reaches setting acceleration value to schedule, exposed coal device is automatically turned on, and simulation coal mine is existing
Field exposed coal, generates the coal and gas prominent once simulated.According to the intensity of outburst of centrifugal model test than ruler relationship, model is tried
The Intensity of coal-gas burst tested is scaled live intensity of outburst, realizes quantifying for colliery scene Intensity of coal-gas burst
Prediction.
The invention has the advantages that: due to the complexity of coal and gas prominent mechanism, coal and gas prominent mechanism
Research also in continuing exploration, the calculation method of the Intensity of coal-gas burst based on various prominent mechanism hypothesis also not at
It is ripe.Coal petrography amount outstanding can be from several tons to the other scale of upper 10,000 tons when coal and gas prominent occurs, and routine test can not simulate.
Small scaled model can be replaced prototype geologic body by " the time-space compression effect " of centrifugal model test, to meet coal
With the requirement of Gas Outburst prediction of strength.Coal and gas prominent centrifugal model test is both a kind of live coal and gas prominent of prediction
Test method, and be a kind of prominent rational important tests means of mechanism of verifying coal and gas prominent.Pass through foundation and coal
The similar stratigraphic model of mine field geology conditions allows model to bear similar weight stress and coal seam air pressure conditions with scene, presses
According to Model Similitude, the intensity of outburst that simulation test is obtained is scaled the intensity of outburst of colliery scene, realizes coal and gas
The quantitative forecast of intensity of outburst.
In addition the invention proposes the countdown durations of the production ratio and method of concrete model and exposed coal device to set
It is fixed, have more exploitativeness.
Detailed description of the invention
Fig. 1 is static overall structure diagram of the invention；
Overall structure diagram when Fig. 2 is operation of the invention；
Fig. 3 is the structural schematic diagram of stratigraphic model case 3 in the present invention.
Wherein: 101. centrifuges, 3. stratigraphic model casees, 501. lower bolts, 103. chambers, chamber when 106. operation,
107. ballast box when operation, 102. ballast boxes, bolt on 502., 2. stratigraphic model bottom plates, 105. chamber bottom plates, 8. stratum
Model casing top outer rim, 9. stratigraphic model cover plates, 301. rubber spacers, 302. overlying rock models, 303. roof models,
Sealing film on 304. coal seams, 305. coal seam models seal film under 306. coal seams, 307. seat earth models, 4. exposed coal devices,
501. lower bolts, 6. extraction valves, 7. gas injection valves.
Specific embodiment
The application is described in further detail with reference to the accompanying drawing, it is necessary to it is indicated herein to be, implement in detail below
Mode is served only for that the application is further detailed, and should not be understood as the limitation to the application protection scope, the field
Technical staff can make some nonessential modifications and adaptations to the application according to above-mentioned application content.
As shown in Figure 1,3, a kind of coal and gas prominent centrifugal model test device, including centrifuge 101, a ballast box
102, chamber 103, stratigraphic model case 3；
The centrifuge 101 is the controllable centrifuge of a rotation acceleration；The ballast box 102 and chamber 103 are logical
It crosses connecting shaft 104 and is mounted on the symmetrical position of centrifuge 101；
The chamber 103 and 102 shape of the ballast box are identical as weight；
The chamber bottom plate 105 of the chamber 103 connects stratigraphic model bottom plate 2 by lower bolt 501；The test
Four sides and the bottom connection sealed to each other of case 103.
102 bottom of ballast box is equipped with a clump weight identical with 3 weight of stratigraphic model case；
The stratigraphic model case 3 include: stratigraphic model bottom plate 2, cover board 9, between stratigraphic model bottom plate and cover board it
Between cylindrical main tank, wherein main tank top edge 8 is fixed by upper bolt 502 and the sealing of cover board 9, and stratigraphic model bottom plate 2 is logical
Bolt 501 is crossed down to be connected and fixed with chamber bottom plate 105；
The space surrounded between the stratigraphic model bottom plate 2, cover board 9 and main tank, successively layering setting from top to bottom: rubber
Rubber mat layer 301, roof model 303, seals under film 304, coal seam model 305, coal seam on coal seam overlying rock model 302
Seal film 306, seat earth model 307；
Wherein rubber spacer 301 is one layer of rubber, and overlying rock model 302 is a closed box, bottom shape and main tank
Inner section is identical, filling steel sand or lead sand in case, and it is flexible sealing that sealing film 306 under film 304, coal seam is sealed on coal seam
Film constitutes a sealing area with main tank, and the coal seam model 305 is made of coal dust and a small amount of binder, fills close with this
Seal region；
Main tank is equipped with extraction valve 6, gas injection valve 7, exposed coal device 4 at coal seam model 305, and the exposed coal device 4 is one
The fast ejector half sealed valve of function is automatically turned on countdown, inside is connected to coal seam model 305.
When carrying out coal and gas prominent simulation and forecast using the device, carried out according to following steps:
Step 1, each layer model in stratigraphic model case (3) is prepared,
Step 1-2 obtains colliery scene roof, bottom plate physical and mechanical parameter,
Step 1-3 prepares roof model and seat earth according to the coal seam top of measurement, bottom plate physical and mechanical parameter
Model, coal seam model coal dust and binder are prepared by a certain percentage, and roof and bottom plate model are using similitude material (weight
Spar powder, quartz sand, gypsum, glycerol, cement and water) it prepares by a certain percentage,
Step 1-4 obtains colliery scene coal seam and coal seam top, bottom plate actual (real) thickness,
Step 1-5, by coal seam and coal seam top, bottom plate actual (real) thickness multiplied byDetermine the thickness of each layer in model,
Step 1-6 is self-possessed according to model height, density and centrifugal acceleration three's product equal to roof overlying rock
The principle of pressure prepares the height of overlying rock model and the loading of steel sand and lead sand,
Each layer is put into stratigraphic model case (3) by step 1-7 in order, is selected the suitable rubber spacer of thickness (301), really
Closed seamless gap between each layer is protected, and cover board (9) are installed with bolt (502)；
Step 2, the bore of exposed coal device (4) is determined,
Step 2-1 obtains colliery scene exposed coal section bore；
Step 2-2, by colliery scene exposed coal section bore multiplied byThat is the bore of exposed coal device (4)；
Step 3, position installation exposed coal device (4), extraction valve (6) and the gas injection of coal seam model (305) are corresponded in main tank wall
Valve (7)；
Step 4-1 closes exposed coal device (4) and gas injection valve (7), by extraction valve (6) extraction coal seam model (305)
Gas,
Step 4-2 closes extraction valve (6), makes coal to coal seam model (305) injection testing gas by gas injection valve (7)
Air pressure in layer model (305) reaches predetermined value,
Step 4-3: the countdown duration T of setting exposed coal device (4) can reach set turn for general 30 minutes or so
Speed,
Step 4-4: starting centrifuge 101, and start countdown,
Step 4-5: after exposed coal device 4 is opened, coal and gas prominent process terminates, and stops centrifuge 101 and moves, collects examination
Coal dust and weighing in tryoff 103；
Step 5-1: determining Intensity of coal-gas burst similar scale K according to the theory of similarity,
Step 5-2: the quality of pc in chamber 103 is converted into multiplied by K the coal and gas prominent coal dust of actual scene
Quality, that is, Intensity of coal-gas burst.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.
Claims (4)
1. a kind of coal and gas prominent centrifugal model test device, it is characterised in that: including centrifuge (101), a ballast box
(102), chamber (103), stratigraphic model case (3)；
The ballast box (102) and chamber (103) pass through connecting shaft (104) and are mounted on the symmetrical position of centrifuge (101)
It sets；
The chamber (103) and the ballast box (102) shape are identical as weight；
The chamber bottom plate (105) of the chamber (103) connects stratigraphic model bottom plate 2 by lower bolt (501)；
Ballast box (102) bottom is equipped with a clump weight identical with stratigraphic model case (3) weight；
The stratigraphic model case (3) includes: stratigraphic model bottom plate (2), cover board (9), between stratigraphic model bottom plate and cover board
Between cylindrical main tank, wherein main tank top edge (8) pass through upper bolt (502) and cover board (9) sealing fix, stratigraphic model case
Bottom plate (2) is connected and fixed by lower bolt (501) and chamber bottom plate (105)；
The space surrounded between the stratigraphic model bottom plate (2), cover board (9) and main tank, successively layering setting from top to bottom: rubber
Rubber mat layer (301), roof model (303), seals film (304), coal seam model on coal seam at overlying rock model (302)
(305), film (306), seat earth model (307) are sealed under coal seam；
Wherein rubber spacer (301) is one layer of rubber, and overlying rock model (302) is a closed box, bottom shape and main tank
Inner section is identical, and steel sand or lead sand are filled in case for compensating roof overlying rock weight stress and seals film on coal seam
(304), film (306) are sealed under coal seam is the sealing film for having deformability, constitutes a sealing area, the coal seam with main tank
Model (305) is made of coal dust and a small amount of binder, is filled in the sealing area；
Main tank is equipped with extraction valve (6), gas injection valve (7), exposed coal device (4), the exposed coal device (4) at coal seam model (305)
There is the fast ejector half sealed valve for automatically turning on function for one, inside is connected to coal seam model (305).
2. a kind of coal and gas prominent centrifugal model test device according to claim 1, it is characterised in that: the test
Four sides and the bottom connection sealed to each other of case (103).
3. a kind of coal and gas prominent centrifugal model test device according to claim 1, it is characterised in that: the centrifugation
Machine (101) is the controllable centrifuge of a velocity of rotation, and the exposed coal device (4) is one fast with countdown open function
Ejector half sealed valve.
4. a kind of carry out Intensity of coal-gas burst using any coal and gas prominent centrifugal model test device of claim 1-3
The method of prediction, which comprises the following steps:
Step 1, each layer model in stratigraphic model case (3) is prepared,
Step 1-1 obtains colliery scene roof, bottom plate physical and mechanical parameter,
Step 1-2 prepares roof model and seat earth model according to the coal seam top of measurement, bottom plate physical and mechanical parameter,
Coal seam model coal dust and binder are prepared by a certain percentage, and roof and bottom plate model use similitude material (barite
Powder, quartz sand, gypsum, glycerol, cement and water) it prepares by a certain percentage,
Step 1-3 obtains colliery scene coal seam and coal seam top, bottom plate actual (real) thickness,
Step 1-4, by coal seam and coal seam top, bottom plate actual (real) thickness multiplied byDetermine the thickness of each layer in model,
Step 1-5 is equal to roof overlying rock weight stress according to model height, density and centrifugal acceleration three's product
Principle prepare the height of overlying rock model and the loading of steel sand and lead sand,
Each layer is put into stratigraphic model case (3) by step 1-6 in order, is selected the suitable rubber spacer of thickness (301), it is ensured that each
Closed seamless gap between layer, and cover board (9) are installed with bolt (502)；
Step 2, the bore of exposed coal device (4) is determined,
Step 2-1 obtains colliery scene exposed coal section bore；
Step 2-2, by colliery scene exposed coal section bore multiplied byThat is the bore of exposed coal device (4)；
Step 3, position installation exposed coal device (4), extraction valve (6) and the gas injection valve of coal seam model (305) are corresponded in main tank wall
(7)；
Step 4-1 closes exposed coal device (4) and gas injection valve (7), passes through the gas in extraction valve (6) extraction coal seam model (305)
Body,
Step 4-2 closes extraction valve (6), makes coal seam mould to coal seam model (305) injection testing gas by gas injection valve (7)
Air pressure in type (305) reaches predetermined value,
Step 4-3: the countdown duration T of setting exposed coal device (4),
Step 4-4: starting centrifuge (101), and start countdown,
Step 4-5: after exposed coal device (4) is opened, coal and gas prominent process terminates, and stops centrifuge (101) movement, collects examination
Coal dust and weighing in tryoff (103)；
Step 5-1: determining Intensity of coal-gas burst similar scale K according to the theory of similarity,
Step 5-2: the quality of pc in chamber (103) is converted into multiplied by K the coal and gas prominent coal dust matter of actual scene
Amount is Intensity of coal-gas burst.
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| CN201810580712.3A CN108956931B (en) | 2018-06-07 | 2018-06-07 | Coal and gas outburst centrifugal model test device and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN118010102B (en) * | 2024-04-09 | 2024-07-12 | 煤炭科学研究总院有限公司 | Disaster early warning method and device for roof micro-deformation and coal stress collaborative monitoring |
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