CN103016057A - Prevention method for dynamic pressure area of working face - Google Patents
Prevention method for dynamic pressure area of working face Download PDFInfo
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- CN103016057A CN103016057A CN2012105544879A CN201210554487A CN103016057A CN 103016057 A CN103016057 A CN 103016057A CN 2012105544879 A CN2012105544879 A CN 2012105544879A CN 201210554487 A CN201210554487 A CN 201210554487A CN 103016057 A CN103016057 A CN 103016057A
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Abstract
The invention solves the defect in the prior art that a tunnel surrounding rock integrally loses stability due to dynamic pressure prevention, and provides a prevention method for the dynamic pressure area of a working face. Pressure relief holes are vertically arranged in two rows in the side surface of a working face tunnel coal pillar with the space of 3m and the row pitch of 1m; the distance between the upper row of pressure relief holes and a top plate is 1m; the length of the pressure relief holes is 1/2 of the width of the coal pillar; one row of side-pasting stakes are arranged on the coal pillar side with the space of 0.5m; and one beam and three pillars are adopted for a working face tail tunnel advanced hydraulic monomer with the space of 1m. With the method, a bottom plate rock layer can be positioned in a stress lowering area so as to guarantee the stable state of the bottom plate rock layer. The pressure relief holes have the advantages of small construction workload and higher construction speed, and the extraction work is not affected. The prevention method for the dynamic pressure area of the working face is especially suitable for a tunnel bottom heave used for controlling the high ground stress.
Description
Technical field
The present invention relates to safety of coal mines production technique field, particularly, is that a kind of large-mining-height working surface dynamic pressure prevents and treats method.
Background technology
In the process of coal mining, if the goaf is arranged near the roadway workface, can make the chain pillar side be subjected to old top, goaf Activity Effects that work plane is produced lateral stress, simultaneously, on cover the entity coal and can produce vertical stress to work plane.Under the effect of adopting vertical stress and horizontal stress, roadway's sides is failure at first, and whole tunnel all is arranged in the rock stratum than soft broken, and at this moment the wall rock loosening ring of tunnel-surrounding is very large, two areas of stress concentration of helping are transferred to the deep of rock mass, and coal column weakens the effect of contraction of base plate.Then, the extruding floor rock flows in the tunnel under powerful horizontal stress effect, thereby produces Floor Heave in Roadway, crush and two phenomenons of helping sidesway the production safety in serious danger side of body colliery.At present, the main method of processing pucking has been the end, increases simultaneously the quantity of advance support, repeatedly rise the end and not only workload greatly, the roadway maintenance expense is significantly increased, but also can affect the stability of roadway's sides and top board, indirectly cause the whole unstability of roadway surrounding rock.
Summary of the invention
The objective of the invention is to solve the defective that dynamic pressure control in the prior art can cause the whole unstability of roadway surrounding rock, provide a kind of work plane dynamic pressure to prevent and treat method.
For achieving the above object, the technical solution used in the present invention is:
A kind of work plane dynamic pressure district prevents and treats method, comprises step: at roadway workface coal column lateral vertical construction pressure relief vent, pressure relief vent adopts double layout, spacing 3m, and array pitch 1m, upper row's pressure relief vent are apart from top board 1m, and pressure relief vent length is 1/2 of coal pillar width; Establish a row in the coal column side and paste side pin, spacing 0.5m; Adopt a beam three posts at the leading hydraulic monomer in work plane tail lane, spacing is 1m.
The present invention in the large-mining-height working surface tunnel in the dynamic pressure district " destressing method adds the support reinforcement method " unite the method for control, be that to take the people be that measure changes laneway stress.Arrange that pressure relief vent can cause that boring far-end country rock recurring structure sexual desire splits destruction, form a reduction band in the country rock deep, the region of high stress of roadway surrounding rock is shifted to the deep, thereby make country rock be in the low stress area, be conducive to the stable of roadway surrounding rock, support reinforcement can make roadway surrounding rock that unstable failure does not occur.
Adopt method of the present invention can make floor strata be in stress relaxed area, thereby guarantee the stable state of floor strata.Pressure relief vent construction working amount is little, and speed of application is very fast, does not affect actual mining.The present invention is specially adapted to control the Floor Heave in Roadway of high-ground stress.
Description of drawings
Fig. 1 is 8210 work planes, 5210 lane dynamic pressure district supporting floor map.
Among the figure, 1-pressure relief vent, 2-pin, 3-monomer.
The specific embodiment
A kind of work plane dynamic pressure of the present invention district prevents and treats method, comprise step: at roadway workface coal column lateral vertical construction pressure relief vent (1), pressure relief vent (1) adopts double layout, spacing 3m, array pitch 1m, upper row's pressure relief vent (1) is apart from top board 1m, and pressure relief vent (1) length is 1/2 of coal pillar width; Establish a row in the coal column side and paste side pin (2), spacing 0.5m; Adopt a beam three posts at the leading hydraulic monomer in work plane tail lane (3), spacing is 1m.
On the basis of such scheme, further strengthen the supporting to top board, adopt the combined supporting mode of " anchor+net+beam ", to strengthen the globality of top board when pressing.
Below take 12# layer 402 panel, South Mountain, ore deposit, Datong Coal Group Company Jin Hua palace 8210 work planes as example, the technical scheme claimed to the present invention is described further.
The Jin Hua palace pit coal owner of farmland will be divided into three regions: Hebei is regional, Henan is regional, South Mountain is regional.The existing main mining coal seam in zone, South Mountain is 12# layer 402 panel, remains four work planes, and 5.7 meters of average coal seam thicknesses are large-mining-height working surface, 7,280,000 tons of residual recoverable reserves, and expectation can be 5 years the phase of adopting.
One, 12# layer 8210 work plane overview
1700 meters of South Mountain, ore deposit, Jin Hua palace 12# layer 402 panel 8210 work plane strike length, 163.7 meters of face lengths, 5.7 meters of coal seam average thickness.It is 1630 meters that work plane can be adopted strike length, and there are 240 meters squeeze districts at the work plane middle part, and the work plane the inside can be adopted and be moved towards 590 meters, and 800 meters of length can be adopted in the outside.5208 lanes of work plane north for opening up, south are 8212 face goafs (in June, 2011, exploitation finished), and western part is auxiliary belt lane, panel, and the east is the entity coal.This work plane adopts the coal-mining method of keeping on file along the top.On cover 375 meters-542 meters of 9# layer work plane coal columns.
The work plane false roof is the Dark grey arenaceous shale, thickness 0.8-1.05/0.9 rice; Immediate roof is the Dark grey packsand, thickness 0-4.16/2.3m, and folder substratum siltstone is distributed in east district (being in area of stress concentration); Old top is the medium coarse sand rock, thickness 13.57-21.06/18.2 rice, and canescence medium coarse sand rock contains FeS
2The coal bar;
Sets of equipment in working face: one one of MG-1100/2760-GW type double-ended shearer, 98 of ZZ13000/28/60 type chock shields, one one of SGZ1000/1400 type drag conveyor, one one of SZZ-1000/375 bridge-type loader, one one of DTL-120/120/3 * 250 model extensible belt conveyor.
Two, dynamic pressure district, 8210 tunnels manifests characteristics and stress analysis
8210 in the large 12# of mining height team layer 402 panel when 5210 lanes push to adopt to 286 meters and 330 meters, impact occurs and press in the leading 200 meters scopes in tunnel, press for twice to concentrate on:
1, wherein pucking is that the dynamic pressure of giving prominence to the most one of manifests.Local location pucking amount reaches more than the 1m, and strike length reaches 60 meters, and the drift section shrinkage factor reaches more than 30%, even back occurs caves in, and safeguards very difficulty.
2, the fried side of adjacent goaf coal column, large 1.2-2.5 meters of the fried side degree of depth, 45 meters of fried side length, coal column side wall supporting crab-bolt and protecting wire net all lost efficacy.
3, roof to floor convergence is uprushed, and when pucking occurs, also is accompanied by sinking and the phenomenon of rupture of top board.
4, the working resistance of support of work plane tail region is up to 45Mpa, has 12 support safety valves unloading to occur.
Pressure area, 5210 lane can be divided into Three regions: in 70 meters in work plane the place ahead, Floor Heave in Roadway amount, the amount of crushing and two are helped to shift near quantitative change shape and are acutely distinguished; In 70 meters-120 meters in work plane the place ahead, Floor Heave in Roadway amount, the amount of crushing and two help to shift near the quantitative change shape district of easing up; In 120 meters-170 meters in work plane the place ahead, Floor Heave in Roadway amount, the amount of crushing and two help to shift near quantitative change shape stable region.
Analyze pressure condition:
1, adjacent 8212 face goafs in south, 5210 lanes, 8212 goaf Lao Ding still was between active stage in June, 2011 exploitation end, and 5210 lane coal column sides are subjected to the old top of 8212 face goafs Activity Effects unstable, and 8210 work planes are produced the left-hand lateral stress.
2,376 meters-542 meters in tail lane on cover 9# layer entity coal; Stress of coal pillar concentration zones General Influence is 30-60 meters of front and back, and maximum can reach 100 meters, produces vertical stress to 8210.
3, twice pressure is 8210 work planes and is in the periodic weighting step pitch; The ore deposit line chart of buckling manifests force value and has and obviously increase resistance, also produces the rear horizontal stresses to 8210.
Three, preventive action
According to field condition and scientific theory, consider employing: the combined supporting method of support reinforcement method and destressing method.Specific design as shown in Figure 1.
1, pressure relief vent
1) at the 12# layer 8210 work plane 5210 lane coal column sides pressure relief vent 1 of vertically constructing.Tail lane section 4.3m * 3.5m, pressure relief vent 2 adopts double layout, and spacing 3m rejects 1m, and upper row's pressure relief vent is apart from top board 1m.
2) rig adopts the ZYJ296/168J column type hydraulic rotary drilling rig, and pressure relief vent 1 adopts 108mm, considers that 20 meters of coal columns of protection are wide, and hole depth adopts 10 meters long.
3) require construction to adopt in the work plane section to the sequence of construction that pushes to adopt direction, for guaranteeing that the constructor wants safely the job location to be no less than 50 meters distances apart from work plane.
2. support reinforcement
1) at first serious for the fried side of tail lane coal column side, the phenomenon that the top board amount of shifting near is large determines to install a row and paste side pin 2,0.5 meter of spacing pressing close to the coal column side.
2) quantity of the leading hydraulic monomer 2 in work plane tail lane increases, and becomes a beam three posts by original two beams, two posts, and spacing becomes 1 meter by 1.5 meters.
3) strengthen simultaneously supporting to top board, adopt " anchor+net+beam " to hang the combined supporting mode, strengthen the globality of top board when pressing.
3. observation
Increasing is to the observation of the both macro and micro in work plane tail lane, and the microcosmic work plane adopts instrument observation and presses forecast, and adopt in the observation of area of stress concentration construction roof delamination monitoring instrument in the tail lane; Requirement is recorded and data analysis microcosmic and tunnel macroscopic view variation.By after several times dynamic pressure back production observation, not have the larger distortion of generation, successfully realized the prevention target.
Adopt that above preventive action have controlled effectively that the pucking in tunnel, side squeeze, roof delamination, sinking and disconnected anchor cable phenomenon.The tunnel has not needed the end to expand the maintenance works such as side, has saved a large amount of human and material resources, financial resources, has guaranteed roadway quality, has strengthened site safety work.The leading face of not taking measures is to advance 1.5 meters on 2 cuttves every day, advances 7 cuttves the rear every day that takes preventive measures, and becomes 180,000 tons of monthly outputs by producing in the original plan 60,000 tons per month, and 600 yuan/tons of coal prices calculate 6,000 ten thousand yuan of wound economic worths.By plan two months shorten to 35 days simultaneously.
Claims (2)
1. a work plane dynamic pressure district prevents and treats method, it is characterized in that comprising step: at roadway workface coal column lateral vertical construction pressure relief vent (1), pressure relief vent (1) adopts double layout, spacing 3m, array pitch 1m, upper row's pressure relief vent (1) is apart from top board 1m, and pressure relief vent (1) length is 1/2 of coal pillar width; Establish a row in the coal column side and paste side pin (2), spacing 0.5m; Adopt a beam three posts at the leading hydraulic monomer in work plane tail lane (3), spacing is 1m.
2. method according to claim 1 is characterized in that: strengthen the supporting to top board, adopt the combined supporting mode of " anchor+net+beam ".
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Cited By (5)
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| CN104847408A (en) * | 2015-05-06 | 2015-08-19 | 西安科技大学 | Dynamic disaster occurrence mechanism and prevention method |
| CN106703888A (en) * | 2016-12-15 | 2017-05-24 | 大同煤矿集团有限责任公司 | In-situ monitoring method of large space motion of coal mine mining stratum |
| CN108194088A (en) * | 2017-12-28 | 2018-06-22 | 西安科技大学 | A kind of soft top coal layer cuts top release gob-side entry retaining method without explosion |
| CN109359393A (en) * | 2018-10-22 | 2019-02-19 | 山西焦煤集团有限责任公司 | Determination method of reasonable mineable period for four mine quantities under uncertain information |
| CN110118085A (en) * | 2019-04-18 | 2019-08-13 | 中国矿业大学 | A kind of compound advanced secondary tunneling method in two lane of top working face of large mining depth high working face |
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| CN104847408A (en) * | 2015-05-06 | 2015-08-19 | 西安科技大学 | Dynamic disaster occurrence mechanism and prevention method |
| CN106703888A (en) * | 2016-12-15 | 2017-05-24 | 大同煤矿集团有限责任公司 | In-situ monitoring method of large space motion of coal mine mining stratum |
| CN108194088A (en) * | 2017-12-28 | 2018-06-22 | 西安科技大学 | A kind of soft top coal layer cuts top release gob-side entry retaining method without explosion |
| CN108194088B (en) * | 2017-12-28 | 2019-03-19 | 西安科技大学 | A kind of soft top coal layer cuts top release gob-side entry retaining method without explosion |
| CN109359393A (en) * | 2018-10-22 | 2019-02-19 | 山西焦煤集团有限责任公司 | Determination method of reasonable mineable period for four mine quantities under uncertain information |
| CN109359393B (en) * | 2018-10-22 | 2023-04-25 | 山西焦煤集团有限责任公司 | Method for Determination of Reasonable Mining Period of Four Quantities in Mine Under Uncertain Information Conditions |
| CN110118085A (en) * | 2019-04-18 | 2019-08-13 | 中国矿业大学 | A kind of compound advanced secondary tunneling method in two lane of top working face of large mining depth high working face |
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