CN204630746U - A kind of top coals' recovery ratio and ore deposit are pressed and are manifested relationship experiments platform - Google Patents
A kind of top coals' recovery ratio and ore deposit are pressed and are manifested relationship experiments platform Download PDFInfo
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- CN204630746U CN204630746U CN201420706962.4U CN201420706962U CN204630746U CN 204630746 U CN204630746 U CN 204630746U CN 201420706962 U CN201420706962 U CN 201420706962U CN 204630746 U CN204630746 U CN 204630746U
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- 238000011084 recovery Methods 0.000 title claims abstract description 41
- 238000002474 experimental method Methods 0.000 title claims abstract description 36
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- 238000005065 mining Methods 0.000 claims abstract description 15
- 238000013480 data collection Methods 0.000 claims abstract description 12
- 238000007405 data analysis Methods 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 12
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Abstract
The utility model discloses a kind of top coals' recovery ratio and ore deposit to press and manifest relationship experiments platform.Described top coals' recovery ratio and ore deposit are pressed and are manifested relationship experiments platform, comprise skeleton mechanism, coal mining mechanism, supporting walking Sub-Level Caving mechanism and data collection and analysis mechanism.The utility model is by skeleton mechanism, coal mining mechanism, supporting walking Sub-Level Caving mechanism and the efficient cooperation of data collection and analysis mechanism, under identical geologic condition can be measured different caving radio, caving mode, drawing coal technology on top coals' recovery ratio under the impact of top coals' recovery ratio and shallow overburden thin bedrock Moderate and Thick Unconsolidated Formation geologic condition on the impact of workplace strata behaviors, reach accurate analog workplace geological condition, efficient precisely prediction work face exploitation accident the object avoiding accident to occur of adopting an effective measure.
Description
Technical field
The utility model relates to mining engineering and technology field, particularly relates to a kind of top coals' recovery ratio and ore deposit and presses and manifest relationship experiments platform.
Background technology
In the recent decade, roof accident has accounted for the first place of all kinds of accident in colliery.Therefore Prevention and controls coal mine roof plate accident is significant for Safety of Coal Mine Production.Serious roof accident was there is in thin-base-rock shallow deep seam mining process, especially under the condition of mine of western shallow overburden, thin bedrock, thick aqueous soil layer, occurred large-area roof step crush force piece, workplace leak top crush support, in unconsolidated formation infiltration cause and leak burst husky, top board of top and be caving suddenly Tornado Impact and cut the accidents such as a roof fall.Therefore by the roof accident control and prediction of mining high-efficiency mining under corresponding experiment table research mining area shallow overburden, thin bedrock, thick aqueous soil layer condition, there is great theory significance and practical value.Based on above-mentioned situation, press in the urgent need to a kind of top coals' recovery ratio and ore deposit and manifest relationship experiments platform, reach accurate analog workplace geological condition, efficient precisely prediction work face exploitation accident the object avoiding accident to occur of adopting an effective measure.
Utility model content
The object of the utility model embodiment is to propose a kind of top coals' recovery ratio and ore deposit and presses and manifest relationship experiments platform, by skeleton mechanism, coal mining mechanism and supporting walking Sub-Level Caving mechanism efficient cooperation, under identical geologic condition can be measured different caving radio, caving mode, drawing coal technology on top coals' recovery ratio under the impact of top coals' recovery ratio and shallow overburden thin bedrock Moderate and Thick Unconsolidated Formation geologic condition on the impact of workplace strata behaviors, reach accurate analog workplace geological condition, efficient precisely prediction work face exploitation accident the object avoiding accident to occur of adopting an effective measure.To achieve these goals, the utility model adopts following technical scheme: a kind of top coals' recovery ratio and ore deposit are pressed and manifested relationship experiments platform, comprising:
Skeleton mechanism, comprise connection template, contiguous block, extrusion screw, girder steel, pressurization screw rod, pressurizing jack, four angle posts, pattern carrier, connecting hole, described extrusion screw to be fixed on contiguous block by screw and to be fixed in contiguous block by its squeezing action by connection template, the height that described connection mode plate experimentally requires is stacked on pattern carrier, described pattern carrier has just been connected to four angle post middle and lower parts, be shaped by pressurization screw rod is fixing between described four angle posts, described girder steel is placed in below top compression screw rod, and connect pressurizing jack bottom it,
Coal mining mechanism, comprise base plate draw-in groove, base plate card, bar shaped bottom plate, turning axle, described base plate draw-in groove is in a row placed in bottom at intervals and connects template middle and lower part, described turning axle end winding support is fixed on bar shaped bottom plate one side in base plate draw-in groove one lateral edges, described base plate card holds up bar shaped bottom plate and is embedded in base plate draw-in groove, realizes the rotation of described bar shaped bottom plate around turning axle by the plug of base plate card;
Supporting walking Sub-Level Caving mechanism, comprises hydraulic support, walking screw mandrel, power transmission block, move frame and put coal screw mandrel, control flume, support bar, move frame slide block, force bearing plate, put coal slide block, slider-crank mechanism, crank and rocker mechanism, control spring, front spy extensible canopy, coal discharge outlet, coal drop, slide block, chute, steel wire, described walking screw mandrel two ends are fixed on four angle posts by bearing, inner tool threaded power transmission block both sides respectively connected row are walked screw mandrel and move frame to put coal screw mandrel, described move frame slide block and put the inner threaded one end of tool of coal slide block be connected to by control flume and move frame and put on coal screw mandrel, described coal slide block other end cunning of putting is embedded on the slide block of described slider-crank mechanism, described moving when the frame slide block other end works is answered back on force bearing plate, the part-structure of described control flume and slider-crank mechanism crank and rocker mechanism is placed on support bar, the slide block of described slider-crank mechanism is placed on hydraulic support by chute, described coal discharge outlet is crank and rocker mechanism one connecting rod, described coal drop is slidably connected on the steel wire of four angle post bottoms, before described, spy extensible canopy is embedded in hydraulic support front-axle beam inside and controls it by built-in control spring and stretches,
Data collection and analysis mechanism, comprise stress section, data line, stress analysis instrument, ultrasonic probe, crack height analyser, described stress analysis instrument is connected with the stress section being placed in coal seam immediate roof by data line, and described crack height analyser is connected with the ultrasonic probe being placed in plastid top and the bottom in analog by data line.
Preferably, described connection template connects by the extrusion screw on contiguous block is mutually flexible, and is stacked on pattern carrier by four angle posts.
Preferably, described four angle posts are fixed-type by the pressurization screw rod be placed in connecting hole.
Preferably, described bar shaped bottom plate material is high strength steel, holding up, can rotate during work around turning axle by being embedded in the base plate card be made up of high-strength material in base plate draw-in groove.
Preferably, described slider-crank mechanism one end by sliding caulking groove with put that coal slide block cunning is embedding to be connected, the crank and rocker mechanism that the other end controls coal discharge outlet by support bar and song is connected.
Preferably, described in move frame and put coal screw mandrel two ends and be connected with walking screw mandrel by power transmission block, in middle part by control flume outer end with move frame slide block be connected the inner with put coal slide block and be connected.
Preferably, described front spy extensible canopy is embedded in hydraulic support front-axle beam inside and controls it by built-in control spring and stretches.
Preferably, in described data collection and analysis mechanism, crack height analyser is all connected with stress section and ultrasonic probe by data line respectively with stress analysis instrument.
Compared with existing three-dimensional simulation experiment table, the utility model tool has the following advantages:
The top coals' recovery ratio that the utility model is addressed and ore deposit are pressed and are manifested relationship experiments platform, subtract by adding or removing the coal rock layer test that scalable template realizes differing heights requirement, the interpolation of varying level stress can be realized, testing table has multiple position to be spliced, and is finished just dismountable, conserve space, is convenient to transport, the relation between top coals' recovery ratio and strata behaviors is studied by the coal cinder of releasing, visual in image, top coal is released smoothly under can realizing the automatic walking of support and distinct methods, after removing partial component, the coal rock layer after test can be divided into two in squash type formwork connection device place if desired, observe section place experimental conditions, by skeleton mechanism, coal mining mechanism, the efficient cooperation of supporting walking Sub-Level Caving mechanism and data collection and analysis mechanism, different caving radio under can measuring identical geologic condition, caving mode, drawing coal technology on top coals' recovery ratio under the impact of top coals' recovery ratio and shallow overburden thin bedrock Moderate and Thick Unconsolidated Formation geologic condition on the impact of workplace strata behaviors, reach accurate analog workplace geological condition, efficient precisely prediction work face exploitation accident the object avoiding accident to occur of adopting an effective measure.
Accompanying drawing explanation
Fig. 1 is that in the utility model embodiment, the one-piece construction schematic diagram manifesting relationship experiments platform is pressed in top coals' recovery ratio and ore deposit;
Fig. 2 is that in the utility model embodiment, the surrounding's skeleton structure diagram manifesting relationship experiments platform is pressed in top coals' recovery ratio and ore deposit;
Fig. 3 is that in the utility model embodiment, the top skeleton structure diagram manifesting relationship experiments platform is pressed in top coals' recovery ratio and ore deposit;
Fig. 4 is that in the utility model embodiment, the corner corbeling figure manifesting relationship experiments platform is pressed in top coals' recovery ratio and ore deposit;
Fig. 5 be in the utility model embodiment top coals' recovery ratio and ore deposit press manifest relationship experiments platform put ground coal structural drawing;
Fig. 6 be in the utility model embodiment top coals' recovery ratio and ore deposit press manifest relationship experiments platform put ground coal component structural figure;
Fig. 7 is that in the utility model embodiment, the Sub-Level Caving structural drawing manifesting relationship experiments platform is pressed in top coals' recovery ratio and ore deposit;
Fig. 8 is that in the utility model embodiment, the walking structure figure manifesting relationship experiments platform is pressed in top coals' recovery ratio and ore deposit;
Fig. 9 is that in the utility model embodiment, the hydraulic rack structure figure manifesting relationship experiments platform is pressed in top coals' recovery ratio and ore deposit;
Figure 10 is that in the utility model embodiment, top coals' recovery ratio and ore deposit are pressed to manifest when relationship experiments platform works and released coal cinder schematic diagram;
Figure 11 is that in the utility model embodiment, top coals' recovery ratio and ore deposit are pressed and manifested relationship experiments platform working state figure.
Embodiment
Shown in composition graphs 1, Fig. 2, Fig. 3, Fig. 4, a kind of top coals' recovery ratio and ore deposit are pressed and are manifested relationship experiments platform, comprise skeleton mechanism, coal mining mechanism, supporting walking Sub-Level Caving mechanism and data collection and analysis mechanism, by the efficient cooperation of each mechanism, under identical geologic condition can be measured different caving radio, caving mode, drawing coal technology on top coals' recovery ratio under the impact of top coals' recovery ratio and shallow overburden thin bedrock Moderate and Thick Unconsolidated Formation geologic condition on the impact of workplace strata behaviors.
In skeleton mechanism, described extrusion screw 111 to be fixed in the disposed thread on contiguous block 113 and to be fixed in contiguous block 113 by its squeezing action by connection template 112, the height that described connection template 112 experimentally requires is stacked on pattern carrier 51, described pattern carrier 51 has just been connected to four angle post 5 middle and lower parts, between described four angle posts, 5 are shaped by pressurization screw rod 3 is fixing, described girder steel 2 is placed in below top compression screw rod 3, and connects pressurizing jack 4 bottom it;
In coal mining mechanism, described base plate draw-in groove 7 is in a row placed in bottom at intervals and connects template 112 middle and lower part, described turning axle 61 end is placed in base plate draw-in groove 7 one lateral edges and is fixed on bar shaped bottom plate 6 one side, described base plate card 71 holds up bar shaped bottom plate 6 and is embedded in base plate draw-in groove 7, realizes the rotation of described bar shaped bottom plate 6 around turning axle 61 by the plug of base plate card 71;
In supporting walking Sub-Level Caving mechanism, described walking screw mandrel 8 two ends are fixed on four angle posts 5 by bearing, inner tool threaded power transmission block 81 both sides respectively connected row are walked screw mandrel 8 and move frame to put coal screw mandrel 91, described move frame slide block 93 and put the threaded one end of the inner tool of coal slide block 92 be connected to by control flume 912 and move frame and put on coal screw mandrel 91, described coal slide block 93 other end cunning of putting is embedded on the slide block 981 of described slider-crank mechanism 98, described moving when frame slide block 92 other end works is answered back on force bearing plate 910, the part-structure of described control flume 912 and slider-crank mechanism 98 crank and rocker mechanism 97 is placed on support bar 95, the slide block 981 of described slider-crank mechanism 98 is placed on hydraulic support 13 by chute 982, described coal discharge outlet 96 is crank and rocker mechanism 97 1 connecting rod, described coal drop 12 is slidably connected on the steel wire 121 of four angle post 5 bottoms, before described, spy extensible canopy 99 is embedded in hydraulic support 13 front-axle beam inside and controls it by built-in control spring 911 and stretches,
In data collection and analysis mechanism, described stress analysis instrument 10 is connected with the stress section 101 being placed in coal seam immediate roof by data line 102, and described crack height analyser 11 is connected with the ultrasonic probe 111 being placed in plastid top and the bottom in analog by data line 112.
Shown in composition graphs 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Figure 10, Figure 11, first experimentally require according to first skeleton mechanism then the coal mining mechanism order that then then supporting walking Sub-Level Caving mechanism lays plastid final data collection analysis mechanism in analog assemble experiment table successively, and check the reliability of each mechanism; Then from base plate draw-in groove 7, extract base plate card 71 makes bar shaped bottom plate 6 rotate releasing bar shaped coal cinder around turning axle 61; Then rotate move frame put coal screw mandrel 91 hydraulic support 13 will putting coal is selected and utilizes walking screw mandrel 8 by power transmission block 81 drive move frame put coal screw mandrel 91 then throw crank slide block mechanism 98 impel crank and rocker mechanism 98 open coal discharge outlet 96 put coal or close coal discharge outlet 96 prevention put coal; Then inject base plate card 71 and tow back to bar shaped bottom plate 6, utilize and move frame and put coal screw mandrel 91 and select hydraulic support 13; Then utilize walking screw mandrel 8 by power transmission block 81 drive move frame put coal screw mandrel 91 promote move the advance that frame slide block 93 bearing plate 910 of answering back on hydraulic prop promotes hydraulic support 13, according to above-mentioned steps work until coal seam has been adopted, utilize stress section 101 and ultrasonic probe 111 to collect related data in above process and be uploaded to stress analysis instrument 10 by data line and crack height analyser 11 carries out analyzing and draws related law and conclusion.
Its experimental procedure is roughly as follows:
A, experimentally require that the scale of experiment table assembles experiment table successively according to skeleton mechanism, coal mining mechanism, supporting walking Sub-Level Caving mechanism, the order of laying plastid, data collection and analysis mechanism in analog, and experiment table is placed on level ground;
B, clamping device is utilized to extract base plate card 71 successively, release the strip identical with bar shaped bottom plate width and simulate coal cinder, and keep the integrality of coal cinder, meanwhile visit extensible canopy 99 automatic spring under control spring 911 acts on before hydraulic support 13, in order to the top board that supporting is exposed;
C, rotate move that frame puts that coal screw mandrel 91 makes the slide block 981 putting in the sliding slider-crank mechanism 98 be embedded in first hydraulic support 13 of coal slide block 92 in, rotate walking screw mandrel 8 to utilize power transmission block 81 to drive to move frame to put coal screw mandrel 91 to walk backward a step pitch, and then throw crank slide block mechanism 98 impels crank and rocker mechanism 97 to be opened by coal discharge outlet 96, carry out the work of first Sub-Level Caving;
D, after reaching regulation top coals' recovery ratio, rotate walking screw mandrel 8 and promote to move frame and put coal screw mandrel 91 and walk forward a step pitch, coal discharge outlet 96 is closed by drive slider-crank mechanism 98 throw crank endplay device 97, and so far first is put coal work and completed;
E, repeat c, Step d and put coal work until complete last, and the base plate card 71 extracted is placed in base plate draw-in groove 7 again holds up the bar shaped bottom plate 6 put down, utilize data collection and analysis mechanism observational record related data;
F, rotate walking screw mandrel 8 and utilize and move frame and put coal screw mandrel 91 and drive and move frame slide block 93 and promote hydraulic support 13 and to advance a step pitch, simultaneously front spy extensible canopy 99 the automatic recovery under squeezing action of hydraulic support 13;
G, rotate walking screw mandrel 8 and utilize and move frame and put coal screw mandrel 91 and drive and move a frame slide block 93 slow astern step pitch, and rotation moves frame puts coal screw mandrel 91 and select second hydraulic support 13 and repeat step f to move second hydraulic support 13;
H, successively repetition step f, h are until complete last movement;
I, successively repetition step a are to step h, and analyzing and processing related data draws related law.
Certainly; more than illustrate and be only preferred embodiment of the present utility model; the utility model is not limited to enumerate above-described embodiment; should be noted that; any those of ordinary skill in the art are under the instruction of this instructions; the all equivalent replacement made, obviously form of distortion, within the essential scope all dropping on this instructions, ought to be subject to protection of the present utility model.
Claims (8)
1. top coals' recovery ratio and ore deposit are pressed and are manifested a relationship experiments platform, it is characterized in that: described top coals' recovery ratio and ore deposit are pressed and manifested relationship experiments platform and comprise:
Skeleton mechanism, comprise connection template, contiguous block, extrusion screw, girder steel, pressurization screw rod, pressurizing jack, four angle posts, pattern carrier, connecting hole, described extrusion screw to be fixed on contiguous block by spiral shell sky and to be fixed in contiguous block by its squeezing action by connection template, the height that described connection mode plate experimentally requires is stacked on pattern carrier, described pattern carrier has just been connected to four angle post middle and lower parts, be shaped by pressurization screw rod is fixing between described four angle posts, described girder steel is placed in below top compression screw rod, and connect pressurizing jack bottom it,
Coal mining mechanism, comprise base plate draw-in groove, base plate card, bar shaped bottom plate, turning axle, described base plate draw-in groove is in a row placed in bottom at intervals and connects template middle and lower part, described turning axle end winding support is fixed on bar shaped bottom plate one side in base plate draw-in groove one lateral edges, described base plate card holds up bar shaped bottom plate and is embedded in base plate draw-in groove, realizes the rotation of described bar shaped bottom plate around turning axle by the plug of base plate card;
Supporting walking Sub-Level Caving mechanism, comprises hydraulic support, walking screw mandrel, power transmission block, move frame and put coal screw mandrel, control flume, support bar, move frame slide block, force bearing plate, put coal slide block, slider-crank mechanism, crank and rocker mechanism, control spring, front spy extensible canopy, coal discharge outlet, coal drop, slide block, chute, steel wire, described walking screw mandrel two ends are fixed on four angle posts by bearing, inner tool threaded power transmission block both sides respectively connected row are walked screw mandrel and move frame to put coal screw mandrel, described move frame slide block and put the inner threaded one end of tool of coal slide block be connected to by control flume and move frame and put on coal screw mandrel, described coal slide block other end cunning of putting is embedded on the slide block of described slider-crank mechanism, described moving when the frame slide block other end works is answered back on force bearing plate, the part-structure of described control flume and slider-crank mechanism crank and rocker mechanism is placed on support bar, the slide block of described slider-crank mechanism is placed on hydraulic support by chute, described coal discharge outlet is crank and rocker mechanism one connecting rod, described coal drop is slidably connected on the steel wire of four angle post bottoms, before described, spy extensible canopy is embedded in hydraulic support front-axle beam inside and controls it by built-in control spring and stretches,
Data collection and analysis mechanism, comprise stress section, data line, stress analysis instrument, ultrasonic probe, crack height analyser, described stress analysis instrument is connected with the stress section being placed in coal seam immediate roof by data line, and described crack height analyser is connected with the ultrasonic probe being placed in plastid top and the bottom in analog by data line.
2. top coals' recovery ratio according to claim 1 and ore deposit are pressed and are manifested relationship experiments platform, it is characterized in that: described connection template connects by the extrusion screw on contiguous block is mutually flexible, and is stacked on pattern carrier by four angle posts.
3. top coals' recovery ratio according to claim 1 and ore deposit are pressed and are manifested relationship experiments platform, it is characterized in that: described four angle posts are fixed-type by the pressurization screw rod be placed in connecting hole.
4. top coals' recovery ratio according to claim 1 and ore deposit are pressed and are manifested relationship experiments platform, it is characterized in that: described bar shaped bottom plate material is high strength steel, holding up by being embedded in the base plate card be made up of high-strength material in base plate draw-in groove, can rotate around turning axle during work.
5. top coals' recovery ratio according to claim 1 and ore deposit are pressed and are manifested relationship experiments platform, it is characterized in that: described slider-crank mechanism one end by sliding caulking groove with put that coal slide block is sliding to be embeddingly connected, the other end is connected with the crank and rocker mechanism controlling coal discharge outlet switch by support bar.
6. top coals' recovery ratio according to claim 1 and ore deposit are pressed and are manifested relationship experiments platform, it is characterized in that: described in move frame put coal screw mandrel two ends by power transmission block with walking screw mandrel be connected, in middle part by control flume outer end with move frame slide block and be connected, by control flume inner with put coal slide block and be connected.
7. top coals' recovery ratio according to claim 1 and ore deposit are pressed and are manifested relationship experiments platform, it is characterized in that: before described, spy extensible canopy is embedded in hydraulic support front-axle beam inside and controls it by built-in control spring and stretches.
8. top coals' recovery ratio according to claim 1 and ore deposit are pressed and are manifested relationship experiments platform, it is characterized in that: in described data collection and analysis mechanism, crack height analyser is all connected with stress section and ultrasonic probe by data line respectively with stress analysis instrument.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614191A (en) * | 2014-11-24 | 2015-05-13 | 中国矿业大学(北京) | Experiment table of relationship between top coal's recovery ratio and strata behavior, application method thereof |
| CN105781617A (en) * | 2016-05-16 | 2016-07-20 | 西安科技大学 | Three-dimensional experiment table for determining optimized parameters of top coal caving mining for extra-thick coal bed |
| CN109372513A (en) * | 2018-12-07 | 2019-02-22 | 山东科技大学 | A kind of top coals' recovery ratio and bastard coal stream percentage of shale content statistic device and method |
| CN109540558A (en) * | 2018-10-25 | 2019-03-29 | 四川大学 | A kind of top coals' recovery ratio and mine pressure show relationship experiments device |
| CN110954671A (en) * | 2018-09-27 | 2020-04-03 | 中国矿业大学(北京) | Fully mechanized caving mining simulation experiment device and method based on stress luminescent material |
| CN114033494A (en) * | 2021-10-18 | 2022-02-11 | 中国矿业大学 | Simulation test system and test method based on top coal caving |
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2014
- 2014-11-24 CN CN201420706962.4U patent/CN204630746U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614191A (en) * | 2014-11-24 | 2015-05-13 | 中国矿业大学(北京) | Experiment table of relationship between top coal's recovery ratio and strata behavior, application method thereof |
| CN104614191B (en) * | 2014-11-24 | 2017-04-12 | 中国矿业大学(北京) | Experiment table of relationship between top coal's recovery ratio and strata behavior, application method thereof |
| CN105781617A (en) * | 2016-05-16 | 2016-07-20 | 西安科技大学 | Three-dimensional experiment table for determining optimized parameters of top coal caving mining for extra-thick coal bed |
| CN105781617B (en) * | 2016-05-16 | 2018-05-11 | 西安科技大学 | A kind of three-dimensional experimental bench of definite super high seam top coal caving Optimal Parameters |
| CN110954671A (en) * | 2018-09-27 | 2020-04-03 | 中国矿业大学(北京) | Fully mechanized caving mining simulation experiment device and method based on stress luminescent material |
| CN110954671B (en) * | 2018-09-27 | 2024-01-26 | 中国矿业大学(北京) | Fully-mechanized caving mining simulation experiment device and method based on stress luminescent material |
| CN109540558A (en) * | 2018-10-25 | 2019-03-29 | 四川大学 | A kind of top coals' recovery ratio and mine pressure show relationship experiments device |
| CN109372513A (en) * | 2018-12-07 | 2019-02-22 | 山东科技大学 | A kind of top coals' recovery ratio and bastard coal stream percentage of shale content statistic device and method |
| CN114033494A (en) * | 2021-10-18 | 2022-02-11 | 中国矿业大学 | Simulation test system and test method based on top coal caving |
| CN114033494B (en) * | 2021-10-18 | 2024-05-07 | 中国矿业大学 | Roof caving coal based simulation test system and test method |
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