CN208297497U - A kind of coal and gas prominent centrifugal model test device - Google Patents
A kind of coal and gas prominent centrifugal model test device Download PDFInfo
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- CN208297497U CN208297497U CN201820880893.7U CN201820880893U CN208297497U CN 208297497 U CN208297497 U CN 208297497U CN 201820880893 U CN201820880893 U CN 201820880893U CN 208297497 U CN208297497 U CN 208297497U
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Abstract
The utility model relates to a kind of coal and gas prominent centrifugal model test devices, including 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；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 certain stratum gravity stress effect of centrifugal acceleration Imitating of setting.
Description
Technical field
The utility model 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 coal and gas prominent centrifugal model test device.
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.Coal with
Coal petrography amount outstanding can be from several tons to the other scale of upper 10,000 tons when Gas Outburst occurs, and traditional laboratory test can not be simulated.
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.
Utility model content
The purpose of this utility model be that provide one kind to solve the above-mentioned problems can be to coal and gas prominent mistake
The centrifugal device of Cheng Jinhang simulation test.
The utility model achieves the above object through the following technical schemes:
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 main tank
A sealing area is constituted, 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 gravity pressure.
Inventive principle: geo-technical centrifuge is that the geotechnical model of minification is placed in high-speed rotating centrifuge,
Allow model to bear the effect for being greater than the centrifugal acceleration of acceleration of gravity, compensate because model scale bring earth structure from
It loses again.Currently, the centrifuge model test carried out both at home and abroad mainly stability of slope, deep basal pit and underground tunnel project,
The simulation of the problems such as migration of harbour and ocean engineering, explosion and impact load and Solid Waste Landfills pollutant.It will contracting
The stratigraphic model of small size is placed in high-speed rotating centrifuge, and model is allowed to withstand greater than the centrifugal acceleration of acceleration of gravity
Effect.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,
Think that model stress is similar to prototype.Currently, predicted both at home and abroad by centrifugal model test the soil body and rock slope scale and
The research of crater volume etc. obtains good effect.According to the likelihood relationship of centrifugal model, if centrifugal acceleration is N
Times acceleration of gravity, when prototype size reduces N times, then the blasting energy in model is the N of prototype3Times, therefore, using minute quantity
Explosive, it can simulation prototype flood tide explosive demolition effect.Wales university of Britain is ground by a series of centrifugal model tests
Studied carefully influence of the underground explosion to underground structure, in centrifugal model to crater shape studies have shown that in model test institute
Crater volume and the empirical equation prediction result that is obtained according to field test observation it is very close.
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 utility model provide a kind of coal that can study above-mentioned three factor interaction with watt
This protrudes physical model.The present invention makes the stratum mould of diminution according to than ruler relationship according to the stratum actual (real) thickness of colliery scene
The physical and mechanical parameter of type, 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 extract the air in the model of coal seam, injection testing gas out, and the air pressure of coal seam model are made to reach predetermined value；
Start centrifuge, when centrifugal acceleration reaches setting acceleration value to schedule, exposed coal device is automatically turned on, and simulates coal
Mine scene exposed coal generates the coal and gas prominent once simulated.According to the intensity of outburst similar scale relationship of centrifugal model test,
The Intensity of coal-gas burst that model test is obtained is scaled live intensity of outburst, realizes that colliery scene coal and gas prominent is strong
The quantitative forecast of degree.
The utility model has the beneficial effect that the complexity due to coal and gas prominent mechanism, coal and gas prominent
The research of mechanism is also in continuing exploration, and the calculation method of the Intensity of coal-gas burst based on various prominent mechanism hypothesis is also not
It is mature.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 mould
It is quasi-.
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.
Detailed description of the invention
Fig. 1 is the static overall structure diagram of the utility model；
Overall structure diagram when Fig. 2 is the operation of the utility model；
Fig. 3 is the structural schematic diagram of stratigraphic model case 3 in the utility model.
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 velocity of rotation；The ballast box 102 and chamber 103 pass through
Connecting shaft 104 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；
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；Four sides and the bottom connection sealed to each other of the chamber 103.
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；
The overlying rock model 302 is a closed box, filling steel sand or lead sand in case；
Main tank is equipped with extraction valve 6, gas injection valve 7, exposed coal device 4 at the model of coal seam, and the inside of the exposed coal device 4 is connected to
Coal seam model 305, and be an automatic opening exposed coal device with countdown function.
Coal seam bottom is prepared using analog material (blanc fixe, quartz sand, gypsum, glycerol, cement and water) by a certain percentage
Slab 307 installs coal seam model 305 on seat earth model 307, and prepared by the coal seam of coal seam model 305 and binder, coal
About 305 layer model, which is installed to seal on coal seam respectively, seals film 306 under film 304 and coal seam, exposed coal device 308, extraction valve 6, note
It is sealed on air valve 7 and coal seam and seals one closed space of film 306 and stratigraphic model box enclosure composition under film 304 and coal seam, protected
The air-tightness of coal seam model has been demonstrate,proved, has sealed the roof model 303 for being mounted with to be prepared on film 304 by analog material on coal seam,
Coal seam model 305, seat earth model 307 and roof model 303 are all to prepare under a certain pressure, roof model
Overlying rock model 302 is installed, overlying rock model 302 is a closed box, filling steel sand or lead sand in case, for mending on 303
Roof overlying rock weight stress is repaid, clogs rubber spacer 301 on 302 top of overlying rock model, effect is to guarantee
The close tight in inner space.Cover board 9 is connected with outer rim 8 on main tank by stratigraphic model case case top fixing bolt 502, uses case
Stratigraphic model case 3 is fixed on chamber bottom plate 105 by bottom fixing bolt 501, is closed exposed coal device 4 and gas injection valve 7, is passed through pumping
Air valve 6 extracts the air in coal seam model 305 out, injection testing gas and reaches air pressure into coal seam model 305 by gas injection valve 7
To scheduled air pressure, gas injection valve 7 is closed.
Such as Fig. 2, centrifuge 101 is started, when 101 acceleration of centrifuge is when the countdown of setting accelerates to predetermined value, is taken off
Device for coal 4 because the time to due to open, simulate exposed coal process, collect the coal dust amount outstanding tested, by weight of intensity of outburst is than ruler
For colliery scene intensity of outburst, the quantitative forecast of colliery scene Intensity of coal-gas burst is realized.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the common of this field
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the protection scope of the utility model.
Claims (3)
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, filling steel sand or lead sand in case, and sealing sealing film (306) under film (304), coal seam on coal seam is to have deformability
Sealing film, constitute a sealing area with main tank, the coal seam model (305) is made of coal dust and a small amount of binder, fills out
It fills 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.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108956931A (en) * | 2018-06-07 | 2018-12-07 | 安徽理工大学 | A kind of coal and gas prominent centrifugal model test devices and methods therefor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108956931A (en) * | 2018-06-07 | 2018-12-07 | 安徽理工大学 | A kind of coal and gas prominent centrifugal model test devices and methods therefor |
| CN108956931B (en) * | 2018-06-07 | 2023-08-01 | 安徽理工大学 | Coal and gas outburst centrifugal model test device and method |
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