CN103397883B - Mutil-coal seam mining Rock Burst method for integrated control - Google Patents
Mutil-coal seam mining Rock Burst method for integrated control Download PDFInfo
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Abstract
The invention discloses a kind of mutil-coal seam mining Rock Burst method for integrated control, estimate employing two according to monitored data and help relieving shot, offering to dredge presses chamber and coal seam high pressure water injection to prevent and treat, wherein, the source of monitored data comprises electromagnetic radiation monitoring, drilling cuttings method coal dust is monitored, ore pressure monitor and Microseismic monitoring system monitoring, deephole bench blasting is on work plane, during the driving of lower lane, immediately following the lower side of driving face in upper lane, lower lane upper, lower side arranges deephole bench blasting, offer Xia Banghexia lane upper of dredging in upper lane during pressure chamber is driving, lower side offers every 40 meters and dredges pressure chamber one, coal-bed flooding is side up and down in tunnel and dredges pressure cave indoor construction Advance Water Injection and be aided with high pressure coal-bed flooding and carry out Controlling of Coal Outburst.The present invention adopts multiple method to carry out Comprehensive forecasting, improves Controlling of Coal Outburst level, effectively can reduce again the loss that bump brings, strengthen specific aim and the validity of erosion control work greatly.
Description
Technical field
The present invention relates to safety of coal mines, specifically a kind of mutil-coal seam mining Rock Burst method for integrated control.
Background technology
Induced factors of pressure bump comprises following several respects factor: (1) tight roof, and thick and hard sandstone roof and floor is easy to put aside energy, and in this case, the coal petrography dynamic impact problem Instability that roof break causes is abnormal swift and violent.The destructiveness of this coal petrography dynamic impact problem unstability is maximum, sudden the strongest in all top board coal petrography dynamic impact problem unstability classifications, the omen of this kind of normal coal petrography dynamic impact problem unstable phenomenon such as not have such as pressure increase, two to help that structure changes.Rock property is Roof rock feature and thickness and the property emitted after seam mining thereof mainly, it is the key factor affecting coal petrography dynamic impact problem unstability, particularly when old top is thick-layer sandstone or other competent bed, base plate is also that the danger of burst coal seam of competent bed structure has more shock hazard.(2) extremely irregularcoal seam, coal seam thickness changes suddenly, coal seam fork, thinning or pinching, change of pitch angle position be the region that bearing pressure increases, easily bring out coal petrography dynamic impact problem unstability.The coal petrography dynamic impact problem unstability disasters such as Sichuan Tianchi Coal Mine, colliery, Mentougou, Beijing all have same rule.(3) exploitation forms the region of high stress, and irrational mining Design often forms high stress areas with construction, and brings out coal petrography dynamic impact problem unstability.Occur that the reason of the region of high stress mainly contains: 1. exploiting field mining sequence is unreasonable; 2. exploitation method is unreasonable; 3. roof controlling method is unreasonable; 4. force piece intensity is low; 5. thick seam slicing system is unreasonable; ⑥ great lane or crossheading are arranged in below coal column; 7. direction of extraction is unreasonable.
In a certain mine or a certain Production Regional, the factor of bringing out coal petrography dynamic impact problem unstability is determined, as operational parameter, geological structure or regularity of coal seam or adopt dark etc., and these parameters are all the imbodies of deep rock mass characteristic.The final purpose of bump research effectively prevents and treats the generation of bump.From the formation mechenism of bump, control the generation of rock blast hazard, change the stress state of coal and rock in fact exactly or control heavily stressed generation, to ensure that coal and rock is not enough to produce unstable failure or astable destruction.According to actual coal and rock condition, the control of bump comprises two aspects, has namely had the bump solution danger of danger of burst coal rock layer and there is no danger of burst at present but the control problem of bump may occur in recovery process.
Controlling of Coal Outburst work all achieves a large amount of achievements from aspects such as theoretical research, prediction, the comprehensive regulations.Exploration of Mechanism has the multiple theories such as strength theory, energy theory, rigidity theory, impact orientation theory, coal petrography Unstability Theory, discloses the genesis mechanism of bump from different perspectives, understanding bump phenomenon is played an important role.But, because bump formation mechenism is very complicated, it manifest and be diversified, be not also very clear to the understanding of bump at present, also do not form unified theory.In the prediction of bump, due to the randomness and sudden that bump occurs, and the diversity of mode of failure, often produce effects less only according to a kind of method.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of mutil-coal seam mining Rock Burst method for integrated control effectively can preventing and treating the generation of bump.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of mutil-coal seam mining Rock Burst method for integrated control; adopt two to help relieving shot according to monitored data, offer to dredge and press chamber and coal seam high pressure water injection to prevent and treat; wherein; the source of monitored data comprises electromagnetic radiation monitoring, the monitoring of drilling cuttings method coal dust; ore pressure monitor and Microseismic monitoring system monitoring; deephole bench blasting is during the driving of work plane upper and lower lane; upper and lower side immediately following the lower side of driving face in upper lane, lower lane arranges deephole bench blasting; arrange a relieving shot hole, the delayed driving face distance≤8m in relieving shot hole for every 5 meters; Offer the upper and lower side dredged in the Xia Banghexia lane in upper lane during pressure chamber is driving and offer thin pressure chamber one every 40 meters, dredging pressure chamber design size is: dark × wide × height=4.5m × 4.0m × 2.6m; Chamber extended distance roadway floor 0.3m, dredging pressure chamber is trapezoidal cross-section, adopts anchor rete cord to carry out supporting, and roll bolt adopts ￠ 22 × 2500mm full-thread bolt, between array pitch 700 × 700mm, two help to adopt ￠ 40 × 2000mm wood bolt, array pitch 800 × 800mm, and diamond mesh protects top side, at top construction two row anchor cable, first row is at chamber opening part, and second row is apart from first row 1m, anchor cable specification ￠ 17.8 × 8000mm; Coal-bed flooding is side up and down in tunnel and dredges pressure cave indoor construction Advance Water Injection and be aided with high pressure coal-bed flooding and carry out Controlling of Coal Outburst.
The present invention is on the basis analyzing geological conditions and production specifications, multiple method is adopted to carry out Comprehensive forecasting, improve Controlling of Coal Outburst level, effectively can reduce again the loss that bump brings, for the recovery scheme design before adopting and the bump integrated control work in recovery process provide scientific basis and technical guarantee, strengthen specific aim and the validity of erosion control work greatly.
Detailed description of the invention
In order to make those skilled in the art understand the present invention better, below in conjunction with detailed description of the invention, clear, complete description is done to technical scheme of the present invention.
Mutil-coal seam mining Rock Burst method for integrated control of the present invention adopts according to monitored data two to help relieving shot, offer and dredge pressure chamber and coal seam high pressure water injection prevents and treats.
One, data monitoring
The source of monitored data comprises electromagnetic radiation monitoring, the monitoring of drilling cuttings method coal dust, ore pressure monitor and Microseismic monitoring system monitoring.Comprehensive all monitored data, laneway stress layout scenarios during analyzing driving, carries out prediction to bump deathtrap.
1, electromagnetic radiation monitoring
(1) type electromagnetic radiation instrument in KBD-5, is utilized to carry out electromagnetic radiation monitoring to the upper and lower lane of work plane.The lower side in point layout Xia Banghexia lane in lane on work plane, driving face arranges 2 points, apart from upper and lower side each 0.5 meter, outwards first 100 meters, arrange a measuring point for every 10 meters, the every 20m of rear 250m arranges a measuring point, carries out sectional monitoring (every 20m arranges a measuring point) to the bump deathtrap divided, each measuring point monitors 2 minutes, and monitoring every day once.When the monitoring of a certain measuring point run into interference value bigger than normal time, again should monitor when this exclusive PCR, be confirmed whether normal.
(2), monitoring and prediction index is intensity level, and size and the change of the intensity level utilizing electromagnetic radiation instrument to record carry out prediction to work plane.
2, drilling cuttings method coal dust monitoring
Drilling cuttings method, as checking means, is carried out drilling cuttings method coal dust to the deathtrap roadway's sides of monitoring out and is detected, and drilling cuttings adopts ZQSJ-90/2.4 type handheld pneumatic rig, drilling rod adopts 1m to visit coal borer bar, drill pipe diameter Ф 42mm, drilling depth 10m, bore angle+5 °.Get bits from 4m(the 4th bar) to 10m(the 10th bar) carry out getting bits successively, weigh once for every meter, when occurring that coal dust weight meets or exceeds 2.8Kg/m, to this bore diameter be changed into 75mm, and this drilling depth extends to 20m, then carry out relieving shot (blasting parameter helps relieving shot parameter with two).
3, pressure observation
During tunneling, arrange pressure observation point in tunnel, follow driving face when tunneling forward, along work plane every 6 to 10 rack arrangement survey line, YHY60 (B) mine digital pressure gauge installed by every bar survey line.Generally within every three days, gather a secondary data, special circumstances gather once for one day.The data gathered are carried out analysis by exclusive data process software in time and are preserved.Find data exception, work plane is pressed, and assign in time to press notice and the forecast of bump danger.
4, micro seismic monitoring forecast
Adopt Polish SOS Microseismic monitoring system to realize whole mine large-scale, the monitoring and forecasting of the large microseismic event of the low frequency of high-order rock stratum, high-energy provides technical basis for Controlling of Coal Outburst during work plane driving.
Two, prophylactico-therapeutic measures
1, two relieving shot is helped
During the driving of work plane upper and lower lane, the upper and lower side immediately following the lower side of driving face in upper lane, lower lane arranges deephole bench blasting, arranges a relieving shot hole for every 5 meters.The delayed driving face distance≤8m in relieving shot hole, strengthens laneway stress release, and the situation avoiding laneway stress to concentrate occurs.
Before explosion, the tunnel of explosion place left and right 20m must watering dust extinguishing, must distinguished and admirable middle gas density within the scope of detailed inspection work plane and explosion place and neighbouring 20 meters, only has and can detonate when gas density is no more than 0.5%.After borehole is accomplished fluently, by eye powder charge, line, every explosive payload is 10.8kg.For guaranteeing the ignition completely of intraocular powder stick, borehole adopts continuation mode powder charge, and shot hole adopts 6 joint cap sensitives, and each powder stick installs a detonator, and each powder stick of intraocular must connect pressure, adopts direct initiation.During the driving of upper and lower lane and when carrying out relieving shot during separating danger, when tunnelling length is less than 300m, under all personnel must withdraw the home at parking lot place, upper and lower lane to, when tunnelling length is greater than 300m, remove people's radius and must not be less than 300m, the big gun time of hiding must not be less than 30 minutes.After explosion, fireman, on-the-spot person in charge start conscientiously to check the situation of explosion place and work plane, phenomenon of whether miss-firing, and scent a hidden danger process in time.After blowing out, apart from blowing out a little 20 meters of scope planted agent watering and lowering dusts.
2, thin pressure chamber is offered
Offer thin pressure chamber one in the upper and lower side in the Xia Banghexia lane in upper lane every 40 meters during driving, dredging pressure chamber design size is: dark × wide × height=4.5m × 4.0m × 2.6m, chamber extended distance roadway floor 0.3m, dredging pressure chamber is trapezoidal cross-section, anchor rete cord is adopted to carry out supporting, roll bolt adopts ￠ 22 × 2500mm full-thread bolt, between array pitch 700 × 700mm, two help to adopt ￠ 40 × 2000mm wood bolt, between array pitch 800 × 800mm, diamond mesh protects top side, at top construction two row anchor cable, first row is at chamber opening part, second row is apart from first row 1m, anchor cable specification ￠ 17.8 × 8000mm, lattice door is accomplished fluently at chamber mouth after Chamber Construction is complete, detect gas except watt inspection person and erosion control person can enter and carry out except pressure observation, other staff must not enter.
3, coal-bed flooding
In work plane tunneling construction except relieving shot, also to be aided with high pressure coal-bed flooding in the side up and down in tunnel and thin pressure cave indoor construction Advance Water Injection and carry out Controlling of Coal Outburst.
Every day is analyzed all monitored data, comprehensive analysis bump degree of danger, when confirming there is danger of burst, drilling cuttings method is adopted to verify, when drilling cuttings index exceeding standard immediately, in time relieving shot is carried out to the abnormal location of detected intensity value, danger releasing measures is tested with electromagnetic radiation instrument after implementing, until when the monitoring of electromagnetic radiation instrument is normal, dangerous releasing can be confirmed, can normal operation be carried out.
For kiln colliery, Datong Coal Group Company Xinzhou, implementation result of the present invention is described below.
Kiln colliery, Xinzhou is located in large oblique in the same way northern minimum position, exploitation Datong seam group, and belong to highly gassy mine, mine yearly productive capacity is 2,300,000 tons, and main employing is moved towards longwall and combined and adopt, combine and put coal-mining method.11
-2-12
-1it is current main mining coal seam that coal closes layer, and it adopts dark average about 378m.This ore deposit adopts multiple seam combined development, and interlamellar spacing is 0-30m.The laminated integrally sandstone having 10-25m thick grown by top board, Protodyakonov coefficient f=8-16, coal seam thickness 0.8-13m, Protodyakonov coefficient f=4.5, and joint fissure agensis belongs to typical tight roof, hard coal seam condition.
According to statistics, 2004 to 2010, the rock blast hazard more than 30 differed at different panels occurrence injury such as eastern three panels and western panels in kiln ore deposit, Xinzhou rises, cause tunnel in various degree and damage of facilities and certain casualties, have impact on normally carrying out of production, resume production and need drop into a large amount of manpower, material resources and financial resources.The project implementation of the present invention so far, though still have the generation of bump, after prediction and prevention measure is implemented, can not affect normal production substantially.Item compared implement before and after the extent of injury of bump can the economic benefit of this project, division it:
1, ensure normally to produce.Kiln ore deposit, Xinzhou produces 2300000 tons per year, and the generation meeting breaks in production of rock blast hazard, the escape from danger phase, carry out necessary prophylactico-therapeutic measures until the process eliminated danger will affect the production in colliery, estimate to be about 100 days/year, by ton coal profit 173.11 yuan calculating, by ensure produce continue carry out, this project can increase economic benefit about 173.11 × 230 × 1,00/,365,=10,908 ten thousand yuan.
2, the expense of overhauling in tunnel is saved.Table 1 is depicted as roadway construction expense, within 1 year, destroys the calculating of 200 meters, tunnel, save the tunnel expense of overhauling and be about 17712.12 × 2,00=,354 ten thousand yuan after the project implementation by bump.
Table 1 roadway construction expense
| Support material takes (unit/rice) | Overhaul expense (unit/rice/year) | Initial investment expense (unit/rice) |
| 9356.06 | 8356.06 | 17712.12 |
3, simultaneously, the predict early of rock blast hazard can reduce the damage of mining equiment, thus saves the expense of equipment component renewal and maintenance, estimates to save about about 5,000,000 yuan every year.
The scope of protection of present invention is not limited to above embodiment; to those skilled in the art; the present invention can have various deformation and change, all in design of the present invention and any amendment, the improvement done within principle be equal to replacement and all should be included within protection scope of the present invention.
Claims (1)
1. mutil-coal seam mining Rock Burst method for integrated control, it is characterized in that: adopt two to help relieving shot according to monitored data, offering to dredge presses chamber and coal seam high pressure water injection to prevent and treat, wherein, the source of monitored data comprises electromagnetic radiation monitoring, drilling cuttings method coal dust is monitored, ore pressure monitor and Microseismic monitoring system monitoring, deephole bench blasting is on work plane, during the driving of lower lane, immediately following the lower side of driving face in upper lane, lower lane upper, lower side arranges deephole bench blasting, arrange a relieving shot hole for every 5 meters, the delayed driving face distance≤8m in relieving shot hole, offer the upper and lower side dredged in the Xia Banghexia lane in upper lane during pressure chamber is driving and offer thin pressure chamber one every 40 meters, dredging pressure chamber design size is: dark × wide × height=4.5m × 4.0m × 2.6m, chamber extended distance roadway floor 0.3m, dredging pressure chamber is trapezoidal cross-section, adopts anchor rete cord to carry out supporting, and roll bolt adopts ￠ 22 × 2500mm full-thread bolt, between array pitch 700 × 700mm, two help to adopt ￠ 40 × 2000mm wood bolt, array pitch 800 × 800mm, and diamond mesh protects top side, at top construction two row anchor cable, first row is at chamber opening part, and second row is apart from first row 1m, anchor cable specification ￠ 17.8 × 8000mm, coal-bed flooding is side up and down in tunnel and dredges pressure cave indoor construction Advance Water Injection and be aided with high pressure coal-bed flooding and carry out Controlling of Coal Outburst,
Described electromagnetic radiation monitoring, utilize type electromagnetic radiation instrument in KBD-5 to carry out electromagnetic radiation monitoring to the upper and lower lane of work plane, the lower side in point layout Xia Banghexia lane in lane on work plane, driving face arranges 2 points, apart from upper and lower side each 0.5 meter, outwards first 100 meters, arrange a measuring point for every 10 meters, the every 20m of rear 250m arranges a measuring point, sectional monitoring is carried out to the bump deathtrap divided, every 20m arranges a measuring point, and each measuring point monitors 2 minutes, and monitoring every day once;
Described drilling cuttings method coal dust monitoring, carry out drilling cuttings method coal dust to the deathtrap roadway's sides of monitoring out to detect, drilling cuttings adopts ZQSJ-90/2.4 type handheld pneumatic rig, drilling rod adopts 1m to visit coal borer bar, drill pipe diameter Ф 42mm, drilling depth 10m, bore angle+5 °, get bits and carry out getting bits successively from 4m to 10m, weighing once for every meter, when occurring that coal dust weight meets or exceeds 2.8Kg/m, this drill pipe diameter be changed into 75mm, and this drilling depth extends to 20m, then carry out relieving shot;
Described pressure observation is during tunneling, arrange pressure observation point in tunnel, and follow driving face when tunneling forward, along work plane every 6 to 10 rack arrangement survey line, YHY60 (B) mine digital pressure gauge installed by every bar survey line.
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