CN104453899A - Safety recovery method of island working surface under complicated condition - Google Patents

Safety recovery method of island working surface under complicated condition Download PDF

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CN104453899A
CN104453899A CN201410618537.4A CN201410618537A CN104453899A CN 104453899 A CN104453899 A CN 104453899A CN 201410618537 A CN201410618537 A CN 201410618537A CN 104453899 A CN104453899 A CN 104453899A
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work plane
working
meters
coal
hole
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CN201410618537.4A
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CN104453899B (en
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陈旭忠
田利军
张效春
李有春
刘锦荣
陈涛
刘宏旺
刘宏珠
武卫东
马来斌
樊靖
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大同煤矿集团有限责任公司
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C41/00Methods of underground or surface mining; Layouts therefor
    • E21C41/16Methods of underground mining; Layouts therefor
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F16/00Drainage

Abstract

The invention relates to a safety recovery method of an island working surface under a complicated condition. An innovated manner of pre-discharging before mining and mining while discharging is adopted, and normal recovery of the working surface is not influenced by deposited water of a goaf. Other relative rock burst prevention and treatment methods including drilling and pressure relief, bottom plate pressure relief and blasting, coal seam water injection and the like are adopted by rock burst prevention and treatment, so that the accuracy degree of predication is improved, the possibility of rock burst is reduced and guarantees are provided for the normal recovery of the working surface. A working surface mining stopping position is comprehensively determined by adopting a manner of combining adjusting slope of tail mining of the working surface and avoiding a periodic pressure position, the length of the working surface is in a cutting range of a coal mining machine and the two ends of the working surface avoid the periodic pressure position, and the middle part of the working surface does not avoid the periodic pressure position.

Description

Complex condition island working face safety coal extraction method

Technical field

The present invention relates to a kind of coal mine work area stoping method, particularly a kind of complex condition island working face safety coal extraction method.

Background technology

In general two crossheadings of island working face and work plane, ore deposit pressure manifests relatively more serious, and has ponding in goaf, work plane both sides, work plane complicated condition more.As kiln ore deposit, Datong Coal Group Company Xinzhou 11 #eastern panel 8101 work plane of layer is an island working face, is 8103 work plane goafs apart from, 20 meters, 5101 lane, is former 11 apart from work plane open-off cut 23 meters of #the eastern two work plane goaf, panel 8312 of layer are former 11 apart from, 30 meters, 2101 lane #layer 302 goaf, panel, there is ponding in goaf, work plane both sides, and in two crossheadings and work plane, ore deposit pressure manifests relatively more serious, and work plane condition more complicated, brings very large difficulty to working face extraction.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of complex condition island working face safety coal extraction method, and the method can ensure the normal back production of work plane.

A kind of complex condition island working face of the present invention safety coal extraction method, comprises the following steps:

A, discharge water in gob area

Before stope, in work plane two crossheading construction dewatering orifice, release work plane both sides water in gob area, and this process is continued to working face extraction always terminate, by crossheading gutter, concentrate track lane gutter to drain into wellhole, when the advance of the face is to during apart from drain hole 10 meters of, close this drain hole immediately, open next row water hole, carry out successively;

Adopt panel compartment drainage, namely when draining is carried out in a panel, other panels stop draining;

B, prevent from top board large area to press

Work plane adopts spontaneous caving to hold concurrently the artificial overhead caving controlroof of two ends, simultaneously according to Face Ground Pressure Behavior situation, anchor is moved back to the roof timbering of two ends, the object in construction overhead caving hole cuts off the integrality of coal seam immediate roof, aggravation immediate roof is caving, avoid the outstanding top of top board large area, cause stress raisers, thus weaken ore deposit pressure to a certain extent and manifest and reduce the possibility of bump generation.

C, Controlling of Coal Outburst

Adopt the method that boring destressing method, base plate relieving shot and coal-bed flooding method combine,

Boring destressing method, adopt large aperture pressure relief vent, from two gate road first advance 30 meters, help at gate road two, apart from roadway floor 0.6 meter successively with 500mm spacing construction φ=108mm × L=8000mm pressure relief vent to stopping adopting line, when working face mining, ensure the construction first advance more than 200 meters of pressure relief vent, help a lateral stress more concentrated because two gate roads face sky, for avoiding occurring surprisingly, therefore use loess sealing of hole 1 meter after facing the side pressure relief vent construction of empty side;

Base plate relieving shot, from two gate road first advance 60 meters, two gate roads successively with 1000mm spacing construction φ=42mm × L=2000mm shot hole to stopping adopting line, wherein, fortune faces empty side 300mm along crossheading borehole blasting pitch-row, air return way borehole blasting pitch-row faces empty side 500mm, when working face mining, ensure the construction first advance more than 200 meters of pressure relief vent, help a lateral stress more concentrated because two gate roads face sky, for avoiding occurring surprisingly, therefore use loess sealing of hole 1 meter after facing the side pressure relief vent construction of empty side;

Coal-bed flooding method, with elongated hole, two-way water flood, sentences 20 meters of spacing multiple operation faces in two gate road work plane sides apart from roadway floor 1.5 meters and carries out water filling along the punching of seam inclination direction.

D, determine the position of terminal mining line

For avoiding periodic weighting, namely according to stopping adopting the principle of last periodic weighting (2/5) L ~ (3/5) L of line-spacing to determine the position of terminal mining line, L is periodic weighting step pitch;

E, work plane ending oblique adjusting

At work plane the position of terminal mining line, place carries out oblique adjusting, unimpeded for transporting during guarantee oblique adjusting, whirler tail end centered by work plane head end, considers the cut scope of coal-winning machine, and after determining oblique adjusting, face length increases by 1.5 meters, in oblique adjusting process, adopt " length ", " short " cutter to intert coal cutting, because head is without advance rate, for prevent conveyer and support glides, on alter, crowded frame, the problem such as to fall apart, when cutting short sword, moving conveyor carries out when the empty cutter of unit is advanced; When cutting rimmer knife, normally carry out moving conveyor, and conveyer is cut neat rib, full face support alinement along full face straightening.

The present invention has following beneficial effect:

1, break the tradition of administering flood and " first controlling and adopting afterwards ", have employed the innovation mode of " adopting front walkthrough, Bian Caibian row ", ensure that water in gob area does not affect the normal back production of work plane.

2, prevent and treat bump and adopt other relevant Controlling of Coal Outburst ways such as boring release, base plate relieving shot, coal-bed flooding; not only increase the order of accuarcy of prediction; and reduce the possibility of bump generation, for the normal back production of work plane provides guarantee.

3, the employing broken traditions single mode determination work plane stops adopting position, namely only consider to stop adopting top, position, base plate and two helps adjoining rock stability situation, adopt work plane end to adopt oblique adjusting, avoid the mode that periodic weighting position combines and comprehensively determine that work plane stops adopting position, guarantee face length within the scope of coal-winning machine cut and work plane two ends avoid periodic weighting position, keep away not open periodic weighting position in the middle part of work plane.

Accompanying drawing explanation

Fig. 1 is the dual rotation pressure schematic diagram bearing immediate roof, old top the working face wall director time.

Fig. 2 is that oblique adjusting schematic diagram is adopted at work plane end.

Detailed description of the invention

With kiln ore deposit 8101, Datong Coal Group Company Xinzhou work plane, explanation clear, complete is further done to the technical scheme that application claims is protected below.

Work plane basic condition

8101 work planes are positioned at kiln mine field, Xinzhou to oblique east, roughly in a fold tectonic, work face length 126 meters, coal seam thickness 2.8 meters ~ 4.6 meters, average 3.56 meters, the two lanes of work plane are arranged, adopt single longwell retrusive, comprehensive mechanized coal mining method that spontaneous caving holds concurrently the artificial overhead caving controlroof of two ends.Analyze 8101 work plane danger of burst index W t=0.69 through composite index law, have medium impact dangerous.Adjacent 402 panel 8215 work planes (adopting for 1986) goaf, work plane east, adjacent 8405 work planes (adopting for 1970) goaf, south, adjacent eastern two panel 8314 work planes (adopting for 1987) goaf, north, western adjacent 8103 work plane goafs, for island working face, top, base plate are middle packsand and the shale alternating layers of about 8 meters, for typical Datong Mine Area " three is hard " coal seam, fold, isolated island, " three is hard " coal seam all can cause work plane and two gate road stress raisers, thus bring out bump, there is ponding in goaf, work plane thing both sides.

Discharge water in gob area

Because 8105,8103 work planes find that water in gob area is running water in improvement flood process; and increment is larger; can not realize first controlling and adopt afterwards; it has been decided through consideration; adopt the method for " adopting front walkthrough, Bian Caibian row "; ensure that water in gob area does not affect the normal back production of work plane; take at work plane inside and outside construction dewatering orifice release Adjacent Working Face water in gob area; namely before back production 8101 work plane; in the large lane of mine prevailing traffic, that is 865 belt lanes, to 8105 construction dewatering orifices, work plane goaf, add up draining 1960m 3, dewatering orifice design parameter sees the following form; Before back production 8101 work plane, in work plane two crossheading construction dewatering orifice, release work plane both sides water in gob area, and this process is continued to working face extraction always terminate, accumulative draining 12440m 3.Two crossheadings, every 100 meters of construction one dewatering orifices, by crossheading gutter, concentrate track lane gutter to drain into wellhole.When the advance of the face is to during apart from drain hole 10 meters of, closes this drain hole immediately, open next row water hole, carry out successively.Due to the restriction by great Xiang ditch drain discharge, each panel drainage works can not carry out simultaneously, for this reason, my employing panel, ore deposit compartment drainage, namely when draining is carried out in a panel, other panels stop draining, and each panel, according to actual conditions close fit, in turn draining, ensure that normally carrying out of mine drainage work.In working face extraction process, water in gob area does not pour in work plane, facts have proved, the construction of dewatering orifice solves the flood problem of work plane well, for the smooth back production of work plane creates condition.

Prevent from top board large area to press

1. goaf top plate management

Work plane adopts spontaneous caving to hold concurrently the artificial overhead caving controlroof of two ends, simultaneously according to Face Ground Pressure Behavior situation, moves back anchor to the roof timbering (anchor pole, anchor cable) of two ends.The object in construction overhead caving hole cuts off the integrality of coal seam immediate roof, and aggravation immediate roof is caving, and avoids the outstanding top of top board large area, cause stress raisers, thus weaken ore deposit pressure to a certain extent and manifest and reduce the possibility of bump generation.

8101 work planes are in progradation, adopt in " pace type ", caving mode that deep hole combines, except constructing except caving hole in open-off cut, also from apart from open-off cut 4 meters of at two gate roads every 6 meters of 3 groups of caving holes of constructing, construction terminates to apart from stopping adopting line 11 meters of, caving hole first advance 80 meters construction, hangs toplap when two ends and crosses 5 × 10m 2time, carry out powder charge, explosion, during explosion, big gun hole allowed support break line 1.5 meters, when goaf top plate slump is better, and not powder charge, explosion.11 #the pseudo-top thickness 0.6m ~ 0.7m in coal seam, panel, east one, direct top thickness 1.9m ~ 2.8m, old top thickness 4.5m ~ 10.24m, be caving near coal column side side top board is more difficult between work plane two ends, then more easily be caving near work plane side side, simultaneously, consider that the direct object of " caving " is that work plane two ends immediate roof is produced crack again, destroy the integrality of coal seam immediate roof, simultaneously again to the presplitting of old jacking row, so, to construct 2 groups of deep holes in coal column side side, to construct 1 group of mesopore in work plane side side, and must ensure that the vertical depth of hole depth at least enters old 1 meter, top, so far, caving hole design parameter is as shown in table 1.

Table 1

Through long-term practice, find when sealed borehole length is 1/3 of hole depth, demolition effect is best, adopts loess sealing of hole simultaneously, and powder charge adopts forward charge constitution.

Overhead caving hole and two ends are moved back anchor and are combined and avoid that top board large area is outstanding pushes up, and reduce the intensity of stress, prevent top board large area to press from source.

2. face roof management

8101 work planes adopt ZZS6000/17/36 type four post support shield type hydraulic support, amount to 87 framves, support opening pressure of safety valve 31MPa.Adopt advanced KJ216 type top board On-Line Dynamic Monitoring system simultaneously, respectively install a set of at 1#, 10#, 20#, 30#, 40#, 50#, 60#, 70#, 80#, 87# support respectively, zoning monitoring work plane inner support working resistance Changing Pattern and safety valve open frequency.Gathered by ore deposit pressure chamber, arrange ore deposit and press data, analyze, statistics ore deposit pressure data, according to Mine pressure analysis, in conjunction with work plane macroscopic view observed case, estimate first and periodic weighting step pitch, issue work plane weighting length in time, ensure work plane safety, advance fast.

To compare proximal surface 8103 work plane, 8101 work planes have employed advanced top board On-Line Dynamic Monitoring system, monitoring face roof pressure distribution situation and ore deposit pressure can manifest situation at any time, simultaneously, in conjunction with work plane macroscopic view observed case, find Rule of roof movement of coal and periodic weighting step pitch, for evaluation bracket support effect, support provide foundation to the well-posedness of such top board and roof weighting rule.

According to the back production experience of 8105,8103 work planes, this force piece working resistance situation of change and Face Ground Pressure Behavior situation, all water component of this work plane are 21 meters, when work plane pushes up periodic weighting always, working resistance of support is generally at 28-30MPa, the safety valve unlatching frequency is higher, working face wall has wall caving phenomenon, and the vexed pier of two gate roads is frequent, shows that now pressure intensity is higher.When work plane goaf is square, ore deposit pressure manifests more strong.

In view of above-mentioned phenomenon, when advance of the face length is close to distance periodic weighting last time 20 meters, strict guarantee pumping plant operating pressure, support setting load, two crossheading advance support setting loads and raising work plane two ends demolition effect.

Find according to long tracking and monitoring, when work plane two ends demolition effect is poor, move back anchor not in time time, on the one hand, not only can cause the increase of two ends immediate roof area of suspension roof, the increase of two ends place working resistance of support, meanwhile, when the direct top-hung apex distance in goaf from reach capacity span time, once slump, a large amount of toxic and harmful can be discharged to work plane, affect the normal production of work plane; On the other hand,

Two ends immediate roof be not caving for a long time cause the working face wall director time bear immediate roof, old top dual rotation pressure as shown in Figure 1, cause that coal wall caving phenomenon increases the weight of, working resistance of support increases.

Top board On-Line Dynamic Monitoring systematic difference can not only grasp change, the understanding Face Ground Pressure Behavior degree of work plane inner support working resistance in time, to instruct team's group safety in production, and, itself and the artificial overhead caving of two ends, two ends are moved back after anchor combines, artificial overhead caving can be grasped, move back the alleviation situation of anchor to work plane stress concentration degree, to optimize the design parameters in overhead caving hole further, make it more scientific, reasonable.

4, bump monitoring technology

1. drilling cuttings method

Drilling cuttings method is the boring by beating diameter 42 ~ 50mm in coal seam, according to the coal dust amount of discharging and Changing Pattern and relevant dynamic effect, and a kind of method of discriminating danger of burst.

For confirming the existence of borehole effect and finding the stress distribution law of 5101 lane advance support sections, and according to 8105, the back production experience of 8103 work planes, play every 10 meters the boring that a diameter is 50mm in 5101 lane adjacent air space side sides, and a boring is played again after bump occurs, compare with before generation, through testing discovery for a long time, within the scope of 5101 lane first advance 10 meters ~ 15 meters, obviously rise apart from rib 8 meters ~ 12 meters coal dust amounts, and sometimes beat with drilling rod, the dynamic effects such as bit freezing, simultaneously, facts have proved that most bump occurs within the scope of this.Before bump occurs, at 5101 lane first advance about 10 meters place, stress is more concentrated, and after bump occurs, peak stress shifts to coal body depths.Meanwhile, down-hole actual conditions have also met this point, and within the scope of this, roadway floor obviously occurs pucking, and advance support girder steel has buckling phenomenon.

2. micro-seismic method

Along with the continuous propelling of work plane, mine pressure will certainly be caused to redistribute, inevitably bring vibrations to a certain degree, micro-seismic method is exactly the energy of record mining vibrations, and then determine, analyze the direction of vibrations, epicenter location is evaluated and predicts mine power phenomenon.Along with the continuous lifting of engineers and technicians' quality, the continuous renewal of On Microseismic Monitoring Technique, the accuracy rate that my ore deposit utilizes this technological prediction bump to occur brings up to more than 60%.

3. electromagnetic radiation method

After excavation is formed, work plane coal body loses balancing of stresses, play pendulum, coal body must deform or break, with to new balancing of stresses status transition, this process can cause electromagnetic radiation, adopts cordless to accept ELECTROMAGNETIC RADIATION SIGNATURE, thus can stress concentration degree be analyzed, the probability of happening of further predicting rock burst.

My ore deposit now adopts the critical method in electromagnetic radiation method to predict, i.e. Continuous Observation electromagnetic radiation amplitude maximum, amplitude average and umber of pulse data in the region not having bump danger, get k times (general k=1.5) of its average as threshold, its predictor formula is

E critical=kE on average

Current electromagnetic radiation method is also in the starting stage in my ore deposit, still immature, also needs the monitoring strengthening this field further in work afterwards.

4. pressure observation method

Traditional pressure observation method mainly observes the amount of crushing, working resistance of support, support post decrement alive and every day carry out macroscopic view observation to face condition, comprises coal wall caving, vexed pier, roof cracking, goaf hanging deck and inbreak, pump station pressure, two gate road roof delamination amounts etc.On this basis, I adopts advanced KJ216 type top board dynamic monitoring system in ore deposit, install a set of every ten framves, the working resistance Changing Pattern of zoning monitoring work plane inner support and safety valve open frequency, find Rule of roof movement of coal and periodic weighting step pitch, gathered by ore deposit pressure chamber, arrange ore deposit pressure data, analyze, add up ore deposit pressure data, according to Mine pressure analysis, in conjunction with work plane macroscopic view observed case, estimate first and periodic weighting step pitch, issue work plane weighting length in time, provide foundation for what prevent bump with having emphasis.

Through proximal surface (8103 work plane) back production experience and the long-term observation to this work plane, find the periodic weighting step pitch average out to 22 meters of this work plane, when pressing, working resistance of support is maximum reaches 5950KN, top, the maximum amount of shifting near of base plate is 90mm, and with vexed pier, there is pucking in two gate road advance support sections, advance support girder steel bends, working face wall wall caving etc., based on this, work plane is in progradation, when adopting to during apart from about 15 meters, periodic weighting last time place, close observation work plane, two gate road strata behaviors situations in conjunction with the data analysis of monitoring system, determine whether top board presses further, to take correlative protection measure.

After taking KJ216 type top board dynamic monitoring system, more scientific to the research of the working resistance Changing Pattern of work plane inner support, no longer as former dependence experience blindly, simultaneously, first time makes research to safety valve open frequency, and in conjunction with work plane macroscopic view observed case, more accurate to the prediction of Rule of roof movement of coal and periodic weighting step pitch, there is more real directive significance to sector.

5, Controlling of Coal Outburst technology

1. to hole destressing method

Destressing method of holing utilizes boring to reduce the elasticity energy accumulated in coal seam, is a kind of effective ways of release elasticity energy.

My employing large aperture, ore deposit pressure relief vent, from two gate road first advance 30 meters, help at gate road two, apart from roadway floor 0.6 meter successively with 500mm spacing construction φ=108mm × L=8000mm pressure relief vent to stopping adopting line, when working face mining, ensure the construction first advance more than 200 meters of pressure relief vent, it is more concentrated that cause two gate roads face empty side one lateral stress, for avoiding occurring surprisingly, therefore uses loess sealing of hole 1 meter after facing the side pressure relief vent construction of sky side.

After pressure relief vent construction, along with the continuous propelling of work plane, bearing pressure moves forward with certain speed equally, when arriving pressure relief vent position, if when bearing pressure is no more than the stability of hole wall, hole wall does not destroy; When bearing pressure exceedes the stability of hole wall, hole wall deformation, bearing pressure is higher, and hole wall damage envelope is larger, further illustrates, and Tunnel Pressure obtains transfer, release.

2. base plate relieving shot

From two gate road first advance 60 meters, two gate roads successively with 1000mm spacing construction φ=42mm × L=2000mm shot hole to stopping adopting line, wherein, fortune faces empty side 300mm along crossheading borehole blasting pitch-row, air return way borehole blasting pitch-row faces empty side 500mm, shot hole fills 3 grades of coal mine allowable powdered emulsified explosives of three volume φ=35mm × L=200mm, when working face mining, ensure the construction first advance more than 200 meters of pressure relief vent, help a lateral stress more concentrated because two gate roads face sky, for avoiding occurring surprisingly, therefore with loess sealing of hole 1 meter after facing the side pressure relief vent construction of empty side, the construction of shot hole is all complete before working face extraction.

Behind construction relieving shot hole, affect by lead abutment pressure, the base plate before loosened is compacted gradually, and illustrate, pressure obtains effective release, and Floor Heave in Roadway degree obviously weakens.

3. coal-bed flooding method

The object of coal-bed flooding mainly reduces elasticity and the intensity of coal body, makes the coal rock layer fringe area of work plane reduce internal bond power, reduces its elasticity, reduce its potential.

8101 work planes adopt elongated hole, two-way water flood, sentence 20 meters of spacing multiple operation faces in two gate road work plane sides apart from roadway floor 1.5 meters to punch along seam inclination direction, hole depth is (1/3) ÷ Cos γ of face length, γ is bore angle, i.e. hole depth=42 meter, bore angle γ=α-θ

α-seam inclination, gets 3 °;

θ-hole maximum lower to angle, generally get 0.2 ~ 0.5 °, this place gets 0.5 °;

Finally, bore angle γ=2.5 °.

The spacing of wells is the width of the moistening coal body of water, and empirically value gets 20 meters

The distance X=TeS+M of water filling first advance

Te-water filling number of days, S-work plane day advance rate, gets 4 meters, and M-stops holing apart from the distance of work plane during water filling, gets 70 meters ~ 80 meters

X=90 rice as calculated.

The distance of water filling first advance must guarantee that the advance of the face is fully infiltrated to coal body during water injection hole.

Water injection rate Q=LBM γ q

Q-ton coal water injection rate, should determine according to the experience in the porosity of water loss rate during water filling, coal body and water filling practice, generally gets 0.03m 3/ t;

L-face length/2; M-coal seam thickness, gets 3.56 meters; γ-coal seam unit weight, gets 1.34t/m 3; B-water injection hole spacing.

Water injection time t=Q/60S,

Q-single hole water injection rate; S-injection flow, gets 0.1m 3/ min.

Water injection pressure 5MPa, adopts water injection hole packer sealing of hole.

Table 2 is water injection hole parameter.

Table 2

After contrasting the water filling forward and backward coal seam index of correlation, analyzing, before discovery water filling, seam hardness coefficient is 4, is 2.85 after water filling, as can be seen here, water filling can reduce coal rock layer hardness, makes coal petrography soft moistening, reduce elasticity, thus reduce the possibility that coal seam gathers strength.

In 8101 work plane erosion control work, in strict accordance with erosion control six word policy, namely " survey, unload, prop up, break, protect, keep away ", during working surface production, pedestrian is forbidden in 5101 lanes, and " dangerous; to forbid to enter separately " board plate is hung at 5101 damper positions places, lane, when work plane stops production for some reason, when stopping adopting, periodic weighting position must be avoided, simultaneously, improve advance support quality, and advance support material all adopts flexible support material, two gate roads all adopt anchor, net, band support pattern when tunneling, and stop to adopt rigid protection.

In 8101 working face mining processes, only in 170 meters, 5101 lane, 180 meters of press with there occurs 2 Secondary Shocks, and all prediction accurately, personnel casualty accidents does not occur, these all have benefited from taking of above-mentioned measure.

Simultaneously, oblique adjusting is carried out to work plane and also can avoid the outstanding top of top board large area, its principle is, by work plane and two gate road obliques, now old top-hung top is trapezoidal, the principle of the section of breaking when reaching Limit Span according to top board, disrumpent feelings will being unlikely on old top causes work plane to press comprehensively, can reduce the possibility of bringing out bump generation to a certain extent.Secondly sensor is buried underground by gun drilling middle in advanced crossheading, monitor the continuous propelling along with exploitation, the Soft soil treatmen of lead abutment pressure, bearing pressure peak value, bearing pressure height peak position and speed of advancement etc., for advance support scope and prevent bump with having emphasis foundation is provided.These monitorings to bump, prevent and treat that new technology is necessary to be tested in my ore deposit, promote.

6, the position of terminal mining line is determined

For avoiding periodic weighting, be namely periodic weighting step pitch according to stopping adopting last periodic weighting (2/5) L ~ (3/5) L(L of line-spacing) principle to determine the position of terminal mining line, namely stop to adopt the last periodic weighting 7 meters ~ 10.5 meters of line-spacing.

Thus, determine once periodic weighting 9 meters of in distance, 2101 Ting Cai positions, lane, 5101 Ting Cai positions, lane once periodic weighting 7.5(9+19.5-21 in distance after work plane oblique adjusting) rice, two crossheading the position of terminal mining lines meet the requirements.Wherein, 6# support ~ 84# support is undesirable, and 52# support is positioned at periodic weighting place.

7, work plane ending oblique adjusting

In order to improve resource recovery, determine to carry out oblique adjusting at work plane the position of terminal mining line place, unimpeded for transporting during guarantee oblique adjusting, whirler tail end centered by work plane head end, consider the cut scope of coal-winning machine, after determining oblique adjusting, face length increases by 1.5 meters, namely after oblique adjusting, face length is 127.5 meters, stop adopting 19.5 meters, advanced head termination, tail termination, place, in oblique adjusting process, for having managed top board, quick oblique adjusting, adopt " length ", " short " cutter interts coal cutting, because head is without advance rate, for preventing conveyer and support downslide, on alter, squeeze frame, the problem such as to fall apart, when cutting short sword, moving conveyor carries out when the empty cutter of unit is advanced, when cutting rimmer knife, normally carry out moving conveyor, and conveyer is cut neat rib, full face support alinement, for next corner is laid a solid foundation along full face straightening.Fig. 2 is that oblique adjusting schematic diagram is adopted at work plane end.After work plane oblique adjusting, 6# support ~ 84# support does not meet and stops adopting line and stop establishing requirement, and 52# support is positioned at periodic weighting place.For this reason, in oblique adjusting process when unit is advanced into this region, adopt and wipe heading tape pressure and time shift frame, support falls less and draws soon, and guarantees that support setting load is qualified.Work plane oblique adjusting makes the many coal mining outputs in my ore deposit 0.58 ten thousand ton, not only increases resource recovery, also alleviates the tensity of Linking up digging to a certain extent simultaneously.

Claims (1)

1. a complex condition island working face safety coal extraction method, comprises the following steps:
A, discharge water in gob area
Before stope, in work plane two crossheading construction dewatering orifice, release work plane both sides water in gob area, and this process is continued to working face extraction always terminate, by crossheading gutter, concentrate track lane gutter to drain into wellhole, when the advance of the face is to during apart from drain hole 10 meters of, close this drain hole immediately, open next row water hole, carry out successively;
Adopt panel compartment drainage, namely when draining is carried out in a panel, other panels stop draining;
B, prevent from top board large area to press
Work plane adopts spontaneous caving to hold concurrently the artificial overhead caving controlroof of two ends, simultaneously according to Face Ground Pressure Behavior situation, moves back anchor to the roof timbering of two ends,
C, Controlling of Coal Outburst
Adopt the method that boring destressing method, base plate relieving shot and coal-bed flooding method combine,
Boring destressing method, adopt large aperture pressure relief vent, from two gate road first advance 30 meters, help at gate road two, apart from roadway floor 0.6 meter successively with 500mm spacing construction φ=108mm × L=8000mm pressure relief vent to stopping adopting line, when working face mining, ensure the construction first advance more than 200 meters of pressure relief vent, face the rear loess sealing of hole 1 meter of empty side side pressure relief vent construction;
Base plate relieving shot, from two gate road first advance 60 meters, two gate roads successively with 1000mm spacing construction φ=42mm × L=2000mm shot hole to stopping adopting line, wherein, fortune faces empty side 300mm along crossheading borehole blasting pitch-row, and air return way borehole blasting pitch-row faces empty side 500mm, when working face mining, ensure the construction first advance more than 200 meters of pressure relief vent, face the rear loess sealing of hole 1 meter of empty side side pressure relief vent construction;
Coal-bed flooding method, with elongated hole, two-way water flood, sentences 20 meters of spacing multiple operation faces in two gate road work plane sides apart from roadway floor 1.5 meters and carries out water filling along the punching of seam inclination direction;
D, determine the position of terminal mining line
For avoiding periodic weighting, namely according to stopping adopting the principle of last periodic weighting (2/5) L ~ (3/5) L of line-spacing to determine the position of terminal mining line, L is periodic weighting step pitch;
E, work plane ending oblique adjusting
At work plane the position of terminal mining line, place carries out oblique adjusting, whirler tail end centered by work plane head end, after oblique adjusting, face length increases by 1.5 meters, in oblique adjusting process, adopt " length ", " short " cutter to intert coal cutting, because head is without advance rate, for prevent conveyer and support glides, on alter, crowded frame, the problem such as to fall apart, when cutting short sword, moving conveyor carries out when the empty cutter of unit is advanced; When cutting rimmer knife, normally carry out moving conveyor, and conveyer is cut neat rib, full face support alinement along full face straightening.
CN201410618537.4A 2014-11-06 2014-11-06 Complex condition island working face safety coal extraction method CN104453899B (en)

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CN105569699A (en) * 2015-12-22 2016-05-11 大同煤矿集团有限责任公司 Inclined shaft development support technology for isolated coal pillar
CN105626150A (en) * 2016-02-04 2016-06-01 山东大学 Micro-seismic monitoring-based gob-side excavation roadway dynamic monitoring and stability evaluating method
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CN106894816A (en) * 2017-02-23 2017-06-27 中国矿业大学 Far field key stratum based on set square structural model cuts top release shield lane method
CN108594295A (en) * 2018-05-31 2018-09-28 天地科技股份有限公司 A kind of coal seam unloading pressure by blasting effect evaluation method
CN109915140A (en) * 2019-04-13 2019-06-21 山东科技大学 Press control method to a kind of irregular gob-surrounded pillar roadway bump

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CN110005431A (en) * 2019-04-13 2019-07-12 山东科技大学 A kind of irregular gob-surrounded pillar working face Controlling of Coal Outburst method

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CN101050709A (en) * 2006-04-03 2007-10-10 郭国政 High water pressure releasing and blocking mining method for mining area
CN101498225A (en) * 2009-02-24 2009-08-05 太原理工大学 U+I type ventilating system for top-coal caving face
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CN104989405A (en) * 2015-06-12 2015-10-21 北京科技大学 Large-dip-angle coal mining rock burst orientation prevention method
CN105569699A (en) * 2015-12-22 2016-05-11 大同煤矿集团有限责任公司 Inclined shaft development support technology for isolated coal pillar
CN105626150A (en) * 2016-02-04 2016-06-01 山东大学 Micro-seismic monitoring-based gob-side excavation roadway dynamic monitoring and stability evaluating method
CN106337685A (en) * 2016-10-21 2017-01-18 中国矿业大学(北京) Method for combined exploitation of coal and its associated oil shales
CN106894816A (en) * 2017-02-23 2017-06-27 中国矿业大学 Far field key stratum based on set square structural model cuts top release shield lane method
CN108594295A (en) * 2018-05-31 2018-09-28 天地科技股份有限公司 A kind of coal seam unloading pressure by blasting effect evaluation method
CN108594295B (en) * 2018-05-31 2019-12-17 天地科技股份有限公司 Method for evaluating coal bed blasting pressure relief effect
CN109915140A (en) * 2019-04-13 2019-06-21 山东科技大学 Press control method to a kind of irregular gob-surrounded pillar roadway bump

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