CN104820084B - Coal and gas outburst similarity simulation test method based on geological mechanical model test - Google Patents
Coal and gas outburst similarity simulation test method based on geological mechanical model test Download PDFInfo
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- CN104820084B CN104820084B CN201510246157.7A CN201510246157A CN104820084B CN 104820084 B CN104820084 B CN 104820084B CN 201510246157 A CN201510246157 A CN 201510246157A CN 104820084 B CN104820084 B CN 104820084B
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Abstract
The invention provides a novel coal and gas outburst similarity simulation test method based on a geological mechanical model test by referring a coal and gas outburst simulation test device and a geotechnical engineering multifunctional test device on the basis of the similar material simulation test concept and the technical concept of the geological mechanical model test. A large-sized three-dimensional coal and gas outburst simulation test device is designed and mainly comprises a reaction frame (1), a hydraulic load (2), a test box body (3), a roadway excavation device (4), a sealing and gas face inflating device (6) and the like. Gas is introduced into a test model of the test box body by establishing a geological structure coal test model (7), so that the geological mechanical model test and the coal and gas outburst similarity simulation test can be reasonably combined, the coal, rock, gas and complex geological structure are integrated, the coal and gas outburst mechanism under variable conditions of the complex geological structure and the coal seam gas reservoir can be explored, and a novel thought is provided for researching the coal and gas outburst mechanism.
Description
Technical field:
The present invention relates to a kind of analog simulation test method, more particularly, to geomechanical model test and large scale three-dimensional coal
The test new method combining with the test of Gas Outburst analog simulation.
Background technology:
China is one of coal and gas prominent disaster country the most serious in the world.
The statistics projecting place in a large number shows, the generation of coal and gas prominent and the impact of complex geological structure have
Close.In Coal mine excavation, when coal seam is in geological structural belt influence area, coalbed gas geology occurrence condition is complicated and changeable,
Unpredictable element increases, and is easier coal and gas prominent under the operating type inductive condition such as driving, exposed coal.
Only fully realize the destructive process of the coal and rock physical equilibrium state being led to by mining operation, understand coal and gas
The development law of prominent dynamic disaster and cause calamity mechanism, solve the key scientific problems that coal and gas prominent dynamic disaster occurs,
Effective hazard prediction, forecasting technique could be studied, reach effective prevention and control coal and gas prominent dynamic disaster to occur
Purpose.
Due to seriousness and the non-controllability of coal and gas prominent, pass through the outstanding research of human-induced in colliery scene
Prominent mechanism is not attainable.Many scholars began in laboratory research coal and gas prominent from last century both at home and abroad, and
Devise many projecting devices although having deepened the progress of coal and gas prominent study mechanism to a certain extent, but most of
Prominent test remains and carries out replica test using moulded coal or other isotropic materials, and less consideration geological structure is to prominent
Impact.
The research great majority with regard to geological structure, coal and gas prominent being affected at present are still managed from the geology of prominent case
Start with by analysis and statistics.
For this reason, the basis in comprehensive reference similar coal and gas prominent experimental rig and Geotechnical Engineering multifunction test device
On, based on Equivalent Materials Testing thought and geomechanical model test new technology thinking it is proposed that a kind of be based on geology power
Learn the coal and gas prominent analog simulation test new method of modeling techniques.
Content of the invention:
Problem to be solved by this invention is: existing coal and gas prominent simulated test exist size little and use be
Moulded coal or other isotropic materials carry out replica test, do not account for the impact to coal and gas prominent for the geological structure, watt
This inflation system is difficult to and the consistent shortcoming of actual coal-bed gas preservation.
For solving the above problems, on the basis of geomechanical model test, by filling in geomechanics test model
Enter methane gas, design gas face aerating device, to realize geomechanical model test and the examination of coal and gas prominent analog simulation
The combination tested.
The coal and gas prominent analog simulation based on geomechanical model testing technology for the present invention tests new method, discloses
A kind of large-scale three dimensional coal and gas prominent analog simulation pilot system, including 1 set of three-dimensional hydraulic charger, 1 large-scale prominent
Simulated test casing, 1 set of gas face aerating device and its corresponding gas gas-flow closure data monitoring system.
Lithology before carrying out coal and gas prominent analog simulation test, first according to the actual coal rock layer in mining area for the present invention
Distribution and geological structure situation, set up structural belt geology coal body test model in laboratory.
Further, before laboratory is carried out before coal and gas prominent simulated test package material, first in test casing four
Be coated with 10mm thick fluid sealant week large-scale prominent simulated test casing is sealed, have after fluid sealant solidification strong sealing and
High resiliency is it is ensured that casing is high pressure resistant and does not leak gas.
Further, the result of the geologic column according to mining area and rock mechanics parameters test, according to analog simulation test
The principle of similitude, be converted into the parameter in model using selected affinity constant, with compression strength as dominant index, carry out similar
Material mixture ratio.
Further, the test model according to the structural belt geology coal body set up, in large-scale prominent simulated test casing
Test material is successively laid according to similar material mixture.The river sand of 1.5mm is less than as aggregate using particle diameter, lime, gypsum are
Cementitious matter as equivalent material simulating Seam Roof And Floor rock stratum, coal seam adopt projecting coal bed in raw coal, structural belt coal seam uses
Prominent coal sample determines by material mixture ratio, joint is all produced using mica with tomography.
Further, after the laying of structural belt geology coal body physical model completes, corresponding in position of sound production set in advance
Data monitoring sensor, including stress, displacement, temperature, gas pressure and sound emission etc..
Further, after sensor and similar materials have been laid, the upper lid of installation test casing and reaction frame, even
Connect the pipeline road that three-dimensional hydraulic loads jack.Meanwhile, gas gas cylinder and the gas face aerating device of test casing are connected, can
Prominent coal sample is implemented uniformly " face inflation ", the actual coal-bed gas of more life-like simulation are originated.
Further, certain pressure is kept to be preloaded after the installation of coal and gas prominent analog simulation pilot system,
Apply the thick silica gel of last layer 30mm afterwards to combine closely with surrounding above box cover plate, formed overall.
Further, connect data monitoring sensor and debugged, the load keeping predetermined is formally loaded and inflates
48 hours to gas adsorption saturation.Thus, can carry out the coal of the coal body of geology containing structural belt under the conditions of different induction modes with watt
This prominent analog simulation test.Meanwhile, the surrouding rock stress in recordable coal and gas prominent generation evolution, displacement, gas
Pressure and sound emission Changing Pattern.
In sum, beneficial effects of the present invention: prominent using the isolation of three-dimensional through hole network structure stainless steel foam material
Simulated test coal sample and air admission hole are it is achieved that implement " face inflation " to coal and gas prominent simulated test coal sample.Test melt coal body,
Rock mass, gas and complex geological structure are integrated, to simulate tomography, fold and to construct the complicated ground quality structure such as soft layering development area
Make band, explore complex geological structure and the changeable Coal Under of coal-bed gas preservation and gas outburst mechanism, be structural belt coal with watt
The research of this prominent mechanism provides a new thinking.
Brief description:
Fig. 1 is the prominent simulation test device structural representation of the present invention.
Fig. 2 is the gas face aerating device composition schematic diagram of the present invention.
Fig. 3 is the analog simulation pilot system of the present invention and the composition schematic diagram of model rock stratum distribution.
Wherein: 1- hydraulic loaded reaction frame；2- hydraulic jack；3- large-scale three dimensional coal and gas prominent analog simulation is tested
Device box；4- roadway excavation mouth；5- gas loading line；6- gas face aerating device；7- structural belt geology coal body；8- is three-dimensional
Through hole network structure stainless steel foam strip of paper used for sealing；Cross pipe road network is inflated in 9- gas face；10- three-dimensional through hole network structure stainless steel steeps
Foam；The airtight panel in 11- gas face aerating device bottom surface；12- stress loading；13- data monitoring sensor；14- analog simulation
The rock stratum distribution of test model.
Specific embodiment:
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment: such as Fig. 1, as shown in Figure 2 and Figure 3, this ciphering type coal and gas prominent three-dimensional simulation experimental rig, including
Hydraulic loading system (1) and (2), test casing (3), 1 gas loading line (5), 1 group of gas face aerating device (6).Described
1 gas loading line (5) is arranged in the lower right side of test casing (3), and described 1 group of gas face aerating device (6) is by 1 gas
The airtight panel in face aerating device bottom surface (11), face inflation cross pipe road network (9), three-dimensional through hole network structure stainless steel foam
(10) form with three-dimensional through hole network structure stainless steel foam strip of paper used for sealing (8), described gas face air inflation sealing device (6) is filled with gas
Air pipe (5) is combined.
The present embodiment, structural belt geology coal body test model (7) set up, there is a drop to be more than coal seam thickness in model
Reversed fault, near Faults develop have fold, make coal seam thickness there occurs change.It is test background according to certain mining area 11-2 coal seam
(14), determine similar materials mix proportion scheme.Similar materials are prepared in test casing according to similar material mixture scheme
(3) successively laid in, before package material, test casing is sealed.
The present embodiment, in the process of deployment of structural belt geology coal body test model (7), lays the base plate rock in coal seam first
Layer and fault plane, then lay footwall above floor strata, leave in casing middle in footwall process of deployment
Groove is used in case laying the reclinate fold of hanging wall below, finally laying hanging wall and twist.Finally, pre-
Positioning puts embedded data monitoring sensor (13).
The present embodiment, after similar materials data monitoring sensor (13) has been laid, adds on test casing
Cover plate, then according to required apply stress university design arrangement hydraulic jack (2) and install reaction frame (1).Finally, connection liquid
The pipeline road of pressure jack and loading line (5).
The present embodiment, keeps certain pressure to carry out preloading two weeks, afterwards on casing after pilot system installation
Apply the thick silica gel of last layer 30mm above cover plate to combine closely with surrounding, formed overall.
The present embodiment, connects data monitoring equipment and acoustic emission probe, and the load keeping predetermined is formally loaded and fills
Gas 48 hours is to gas adsorption saturation.After gas adsorption saturation, open tunnel sealing steel plate and rubber cushion carries out roadway excavation and lures
Lead coal and gas prominent.Record surrouding rock stress, displacement, gas pressure and sound emission Changing Pattern during excavation.
Claims (3)
1. a kind of coal and gas prominent analog simulation test method based on geomechanical model testing technology, it is characterized in that including
Following steps:
(1) lithology distributions according to the actual coal rock layer in mining area and geological structure situation, sets up structural belt geology coal body in laboratory
Test model；
(2) it is coated with the thick fluid sealant of 10mm in test casing surrounding prominent simulated test casing is sealed；
(3) result of the geologic column according to mining area and rock mechanics parameters test, similar former according to analog simulation test
Reason carries out similar material mixture, according to the test model of the structural belt geology coal body set up, according to similar in test casing
Material mixture ratio successively lays test material；
(4) in structural belt geology coal body physical model process of deployment, in position of sound production gas face set in advance charger
With corresponding data monitoring sensor, including stress, displacement, temperature, gas pressure and sound emission；
(5) after sensor and similar materials have been laid, the upper lid of installation test casing and reaction frame, connect three-dimensional liquid
Pressure loads the pipeline road of jack；Meanwhile, gas gas cylinder and the gas face aerating device of test casing are connected；
(6) certain pressure is kept to carry out preloading two weeks after the installation of coal and gas prominent analog simulation pilot system, it
Apply the thick silica gel of last layer 30mm afterwards to combine closely with surrounding above box cover plate, formed overall；
(7) connect data monitoring sensor and debugged, the load keeping predetermined is formally loaded and inflates 48 hours extremely
Gas adsorption saturation, thus, can carry out the coal and gas prominent phase of the coal body of geology containing structural belt under the conditions of different induction modes
Like simulated test；Surrouding rock stress in record coal and gas prominent generation evolution, displacement, gas pressure and sound emission change
Rule.
2. realize the large-scale three dimensional simulation experiment system of the coal and gas prominent analog simulation test method in claim 1, should
System is mainly by hydraulic loaded reaction frame, three-dimensional loading jack, three dimensional taest casing, roadway excavation mouth, gas face inflation dress
Put and test monitoring system composition；Reaction frame overall dimension is 5660mm (length) × 2800mm (wide) × 3430mm (high), test
Casing inside dimension is 2800mm (length) × 2800mm (wide) × 2000mm (high).
3. simulation experiment system described as claimed in claim 2 is it is characterised in that gas face aerating device, airtight in its bottom surface
Crisscross having the high pressure resistant of cancellated diameter 6mm and bore foraminate copper tubule is fixed on panel, copper thin
It is welded with pipe that hole aperture is little, ventilative and impermeable dust three-dimensional through hole network structure stainless steel foam, to isolate air admission hole
With coal sample it is ensured that the inflation of uniform face is carried out to the coal sample of test model.
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| US20130265565A1 (en) * | 2012-04-09 | 2013-10-10 | Progression, Inc. | Coal analysis system |
| CN203587575U (en) * | 2013-10-30 | 2014-05-07 | 中煤科工集团重庆研究院有限公司 | Coal and gas outburst stimulation device |
| CN204287148U (en) * | 2014-12-09 | 2015-04-22 | 山东大学 | Unitary coal and gas adsorption desorb and outstanding test unit |
| CN204575638U (en) * | 2015-05-14 | 2015-08-19 | 安徽理工大学 | The gas face aerating device of large-scale three dimensional coal and gas prominent simulation experiment system |
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Effective date of registration: 20200424 Address after: 236200 Anhui city of Fuyang province Yingshang County Industrial Park Patentee after: AO DE MINING MACHINERY EQUIPMENT SCIENCE AND TECHNOLOGY Co.,Ltd. Address before: 232001 Anhui Province, Huainan city Shungeng Road No. 168 Patentee before: Anhui University of Science and Technology |
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