CN104453899B - Complex condition island working face safety coal extraction method - Google Patents
Complex condition island working face safety coal extraction method Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
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Abstract
The present invention relates to a kind of complex condition island working face safety coal extraction method, have employed the innovation mode of " adopting front walkthrough, Bian Caibian row ", it is ensured that water in gob area does not affect the normal back production of work surface.Preventing and treating bump uses other relevant Controlling of Coal Outburst ways such as boring release, base plate relieving shot, coal-bed flooding, not only increases the order of accuarcy of prediction, and reduces the possibility that bump occurs, and the normal back production for work surface provides guarantee.Work surface end is used to adopt oblique adjusting, avoid the mode that periodic weighting position combines and comprehensively determine that work surface stops adopting position, guarantee that in the range of coal-winning machine cut and work surface two ends avoids periodic weighting position to face length, keeps away not open periodic weighting position in the middle part of work surface.
Description
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 returns safely
Mining method.
Background technology
In general two crossheadings of island working face and work surface, to manifest ratio more serious and many in goaf, work surface both sides for ore deposit pressure
There are hydrops, work surface complicated condition.Such as kiln ore deposit, Datong Coal Group Company Xinzhou 11#Eastern panel 8101 work surface of layer is an isolated island job
Face, is 8103 work surface goafs at 20 meters of 5101 lane, is former 11 at work surface open-off cut 23 meters#Eastern two panel 8312 of layer
Work surface goaf, is former 11 at 30 meters of 2101 lane#Layer 302 goaf, panel, there is hydrops in goaf, work surface both sides, and two is suitable
In groove and work surface, to manifest ratio more serious for ore deposit pressure, and work surface condition is more complicated, brings the biggest 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, the party
Method can ensure the normal back production of work surface.
One complex condition island working face safety coal extraction method of the present invention, comprises the following steps:
A, discharge water in gob area
Before stope, in work surface two crossheading construction dewatering orifice, release work surface both sides water in gob area, and
It is continued for this process to working face extraction to terminate, drains into shaft bottom water by crossheading drain pipe, collection middle orbit lane drain pipe
Storehouse, when the advance of the face is to time at osculum 10 meters, closes this osculum immediately, opens next row water hole, carry out successively；
Using panel compartment drainage, i.e. when a panel carries out draining, other panels stop draining；
B, prevent top board large area from pressing
Work surface uses spontaneous caving to hold concurrently two ends artificial overhead caving controlroof, simultaneously according to Face Ground Pressure Behavior
Situation, moves back anchor to the roof timbering of two ends, and the purpose in construction overhead caving hole is turned off the integrity that coal seam is directly pushed up,
Aggravation directly top is caving, it is to avoid the outstanding top of top board large area, causes stress raisers, thus it is aobvious to weaken ore deposit pressure to a certain extent
The probability that existing and reduction bump occurs.
C, Controlling of Coal Outburst
Use the method that boring platen press, base plate pressure explosion and coal-bed flooding method combine,
Boring destressing method, uses large aperture pressure relief vent, from the beginning of two gate road first advance 30 meters, at gate road
Two help, adopt line, in work with the pressure relief vent of 500mm spacing construction φ=108mm, L=8000mm to stopping successively away from roadway floor 0.6 meter
When making face exploitation, it is ensured that the construction first advance of pressure relief vent more than 200 meters, relatively collect because two gate roads face empty side one lateral stress
In, for avoiding the occurrence of accident, therefore with loess sealing of hole 1 meter after facing the side pressure relief vent construction of empty side；
Base plate relieving shot, from the beginning of two gate road first advance 60 meters, at two gate roads successively with 1000mm
Spacing construction φ=42mm, the blast hole of L=2000mm adopt line to stopping, and 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, it is ensured that the construction first advance of pressure relief vent 200 meters
Above, relatively concentrate because two gate roads face empty side one lateral stress, for avoiding the occurrence of accident, therefore after facing the side pressure relief vent construction of empty side
With loess sealing of hole 1 meter；
Coal-bed flooding method, with elongated hole, two-way water flood, two gate road work surfaces sides at roadway floor 1.5 meters with
20 meters of spacing multiple operation faces carry out water filling along the punching of seam inclination direction.
D, determine the position of terminal mining line
For avoiding periodic weighting, i.e. determine according to the principle stopping adopting line-spacing last time periodic weighting (2/5) L～(3/5) L
The position of terminal mining line, L is periodic weighting step pitch；
E, work surface ending oblique adjusting
Oblique adjusting is carried out at work surface the position of terminal mining line, unimpeded for transporting during ensureing oblique adjusting, with work surface head end be
Central rotation machine tail end, it is contemplated that the cut scope of coal-winning machine, after determining oblique adjusting, face length increases by 1.5 meters, in oblique adjusting mistake
Cheng Zhong, uses " length ", " short " cutter to intert coal cutting, owing to head is without advance rate, for prevent conveyer and support downslide, on
Altering, squeeze frame, the problem such as fall apart, when cutting short sword, moving conveyor is carried out when unit sky cutter is advanced；When cutting rimmer knife, it is normally carried out
Moving conveyor, and conveyer along full face straightening and is cut neat rib, full face support alinement.
The method have the advantages that
1, break the tradition that improvement flood " is first controlled and adopted afterwards ", have employed the innovation mode of " adopting front walkthrough, Bian Caibian row ", protect
Card water in gob area does not affect the normal back production of work surface.
2, preventing and treating bump uses other relevant bumps such as boring release, base plate relieving shot, coal-bed flooding
Prevention and treatment method, not only increases the order of accuarcy of prediction, and reduces the possibility that bump occurs, normal for work surface
Back production provides guarantee.
3, the single mode of employing broken traditions determines that work surface stops adopting position, the most only consider to stop adopting top, position, base plate and
Two help adjoining rock stability situation, use work surface end to adopt oblique adjusting, avoid the mode that periodic weighting position combines and comprehensively determine work
Face stops adopting position, it is ensured that face length is in the range of coal-winning machine cut and work surface two ends avoids periodic weighting position, work
Periodic weighting position is kept away not open as Middle face.
Accompanying drawing explanation
Fig. 1 is to bear directly top, the dual rotation pressure schematic diagram on old top at working face wall for a long time.
Fig. 2 is that oblique adjusting schematic diagram is adopted at work surface end.
Detailed description of the invention
Claimed technical scheme is done the most clear with kiln ore deposit 8101, Datong Coal Group Company Xinzhou work surface below
Chu, complete explanation.
Work surface basic condition
8101 work surfaces are positioned at kiln mine field, Xinzhou to oblique east, and substantially in a fold tectonic, work face length 126 meters, coal
Layer thickness 2.8 meters～4.6 meters, average 3.56 meters, the double lane of work surface is arranged, uses single longwell retrusive, spontaneous caving to hold concurrently two
The comprehensive mechanized coal mining method of termination artificial overhead caving controlroof.8101 work surface impact danger are analyzed through composite index law
Danger index W t=0.69, has medium impact dangerous.Adjacent 402 panel 8215 work surfaces (adopting for 1986) goaf, work surface east, south
Adjacent 8405 work surfaces (adopting for 1970) goaf, adjacent eastern two panel 8314 work surfaces (adopting for 1987) goaf, north, west is adjacent
8103 work surface goafs, for island working face, top, base plate are medium-fine sand rock and the shale alternating layers of about 8 meters, for typically
Datong Mine Area " three is hard " coal seam, work surface and two gate road local stress collection all can be caused in fold, isolated island, " three is hard " coal seam
In, thus inducing bump, there is hydrops in goaf, work surface thing both sides.
Discharge water in gob area
Owing to 8105,8103 work surfaces find that during administering flood water in gob area is running water, and increment compares
Greatly, it is impossible to realize first controlling adopting afterwards, it has been decided through consideration, the method using " adopting front walkthrough, Bian Caibian row ", it is ensured that water in gob area is not
Affect the normal back production of work surface, take to discharge in work surface inside and outside construction dewatering orifice Adjacent Working Face water in gob area, i.e. exist
Before back production 8101 work surface, in belt lane, the big lane of mine prevailing traffic that is 865 to 8105 construction dewatering orifices, work surface goaf,
Accumulative draining 1960m3；Before back production 8101 work surface, in work surface two crossheading construction dewatering orifice, release work surface both sides are adopted
Dead zone hydrops, and be continued for this process to working face extraction to terminate, accumulative draining 12440m3.Two crossheadings are every 100 meters
Construct a dewatering orifice, drain into wellhole by crossheading drain pipe, collection middle orbit lane drain pipe.When the advance of the face is to away from draining
Time at 10 meters of hole, close this osculum immediately, open next row water hole, carry out successively.Due to by great Xiang ditch drain discharge
Limiting, each panel drainage works can not be carried out simultaneously, to this end, my ore mining panel compartment drainage, i.e. carries out when a panel
During draining, other panels stop draining, and each panel is according to practical situation close fit, in turn draining, it is ensured that mine drainage work
That makees is normally carried out.During working face extraction, water in gob area does not pour in work surface, in practice it has proved that, dewatering orifice
Construction solve the flood problem of work surface well, the smooth back production for work surface creates condition.
Prevent top board large area from pressing
1. goaf top plate management
Work surface uses spontaneous caving to hold concurrently two ends artificial overhead caving controlroof, simultaneously according to Face Ground Pressure Behavior
Situation, moves back anchor to the roof timbering (anchor pole, anchor cable) of two ends.It is direct that the purpose in construction overhead caving hole is turned off coal seam
The integrity on top, aggravation directly top is caving, it is to avoid the outstanding top of top board large area, causes stress raisers, thus to a certain degree
On weaken ore deposit pressure manifest and reduces bump generation probability.
8101 work surfaces, in progradation, use in " pace type ", caving mode that deep hole combines, except cutting opening
Outside ophthalmic construction caving hole, also starting at away from open-off cut 4 meters at two gate roads every 6 meters of 3 groups of caving holes of constructing, construction is extremely
Terminate away from stopping adopting at 11 meters of line, caving hole first advance 80 meters construction, hang toplap when two ends and cross 5 × 10m2Time, fill
Medicine, explosion, during explosion, big gun hole allowed support break line 1.5 meters, when goaf top plate slump is preferable, not powder charge, explosion.11#
East one coal seam, panel puppet top thickness 0.6m～0.7m, direct top thickness 1.9m～2.8m, old top thickness 4.5m～10.24m, between work surface
Two ends is caving near coal column side side top board is more difficult, is then easier to be caving near work surface side side, considers again meanwhile
The direct purpose of " caving " is that work surface two ends is directly pushed up generation crack, destroys the integrity that coal seam is directly pushed up, the most again
Will to old jacking row presplitting, so, construct 2 groups of deep holes in coal column side side, 1 group of mesopore of constructing in work surface side side, and must
Must ensure that the vertical depth of hole depth at least enters 1 meter of old top, so far, caving hole design parameter is as shown in table 1.
Table 1
Through long-term practice, finding when 1/3 that sealed borehole length is hole depth, demolition effect is best, uses loess simultaneously
Sealing of hole, powder charge uses forward charge constitution.
Overhead caving hole is moved back anchor and is combined and avoid the outstanding top of top board large area with two ends, reduces the collection intermediate range of stress
Degree, prevents top board large area to press from source.
2. face roof management
8101 work surfaces use ZZS6000/17/36 type four post support shield type hydraulic support, 87 frame altogether, support safety
Valve opening pressure 31MPa.Use simultaneously advanced person KJ216 type top board On-Line Dynamic Monitoring system, respectively 1#, 10#, 20#,
30#, 40#, 50#, 60#, 70#, 80#, 87# support is respectively installed a set of, zoning monitoring work surface inner support working resistance change rule
Rule and relief valve open frequency.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 surface macroscopic view observed case, it is contemplated that first and periodic weighting step pitch, issue work surface weighting length in time, it is ensured that work
Face safely, quickly propel.
Compare proximal surface 8103 work surface, and 8101 work surfaces have employed the top board On-Line Dynamic Monitoring system of advanced person, it is possible to
Monitoring face roof pressure distribution situation and ore deposit pressure manifest situation at any time, meanwhile, in conjunction with work surface macroscopic view observed case, find
Rule of roof movement of coal and periodic weighting step pitch, for evaluating bracket support effect, support to the well-posedness of such top board and top board
Rule is pressed to provide foundation.
According to the back production experience of 8105,8103 work surfaces, this force piece working resistance situation of change and work surface ore deposit
Pressure manifests situation, and all water component of this work surface are 21 meters, and when work surface pushes up periodic weighting always, working resistance of support is universal
At 28-30MPa, the relief valve unlatching frequency is higher, and working face wall has wall caving phenomenon, and the two vexed piers of gate road are frequent, show this
Time pressure intensity higher.When work surface goaf is square, ore deposit pressure manifests the strongest.
In view of above-mentioned phenomenon, when advance of the face length is close to during away from periodic weighting last time 20 meters, strict guarantee pumping plant work
Make pressure, support setting load, two crossheading advance support setting loads and improve work surface two ends demolition effect.
Find according to long tracking and monitoring, when work surface two ends demolition effect is poor, when moving back anchor not in time, a side
Face, not only results in working resistance of support at the increase of two ends direct top-hung top area, two ends and increases, meanwhile, work as goaf
Directly top-hung apex distance from reach capacity span time, once slump, a large amount of toxic and harmfuls can be discharged to work surface, affect work
The normal production in face；On the other hand,
Two ends is directly pushed up not to be caving for a long time to cause and is born directly top, old dual time pushed up at working face wall for a long time
Turn pressure as it is shown in figure 1, cause coal wall caving phenomenon to increase the weight of, working resistance of support increase.
Top board On-Line Dynamic Monitoring systematic difference can not only grasp in time work surface inner support working resistance change,
Solve Face Ground Pressure Behavior degree, in order to instruct team's group safety in production, and, itself and the artificial overhead caving of two ends, two ends
Move back after anchor combines, artificial overhead caving can be grasped, move back the anchor alleviation situation to work surface stress concentration degree, in order to further
Optimize the design parameter in overhead caving hole so that it is 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 discharged and Changing Pattern thereof
With relevant dynamic effect, differentiate a kind of method of danger of burst.
For confirming the existence of borehole effect and finding the stress distribution law of 5101 lane advance support sections, and foundation 8105,
The back production experience of 8103 work surfaces, plays the boring of an a diameter of 50mm in 5101 lane adjacent air space side sides every 10 meters, and in impact
Play a boring again after ground Hair Fixer is raw, compare, through testing discovery for a long time, at 5101 lane first advances before occurring
In the range of 10 meters～15 meters, at rib 8 meters～12 meters, coal dust amount substantially rises, and sometimes beat with drilling rod, bit freezing etc. dynamic
Stress effect, simultaneously, in practice it has proved that most bumps occur within the range.Before bump occurs, super in 5101 lanes
Leading face about 10 meters place, stress is relatively concentrated, and after bump occurs, peak stress shifts to coal body depths.Meanwhile, down-hole
Practical situation has also complied with this point, and in the range of being somebody's turn to do, roadway floor substantially occurs that pucking, advance support girder steel have buckling phenomenon.
2. micro-seismic method
Along with the continuous propelling of work surface, mine pressure will certainly be caused to redistribute, inevitably bring certain
The vibrations of degree, micro-seismic method is exactly the energy of record mining vibrations, and then determines, analyzes the direction of vibrations, carrys out epicenter location
Evaluate and prediction mine power phenomenon.Along with constantly the promoting of engineers and technicians' quality, On Microseismic Monitoring Technique the most more
Newly, the accuracy rate that my ore deposit utilizes this technological prediction bump to occur has brought up to more than 60%.
3. electromagnetic radiation method
After excavation is formed, work surface coal body loses stress equilibrium, plays pendulum, and coal body must become
Shape or rupture, with to new stress equilibrium status transition, this process can cause electromagnetic radiation, uses cordless to accept electricity
Magnetic radiation signal such that it is able to analyze stress concentration degree, the probability of happening of further predicting rock burst.
My ore deposit now uses the critical method in electromagnetic radiation method to be predicted, and i.e. connects in the region not having bump danger
Continuous observation electromagnetic radiation amplitude maximum, amplitude meansigma methods and umber of pulse data, k times (general k=1.5) taking its meansigma methods are made
For marginal value, its predictor formula is
ECritical=kEAveragely
At present electromagnetic radiation method in my ore deposit also in the starting stage, the most immature, work afterwards also needs to into one
Step strengthens the monitoring in this field.
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
Face condition is carried out macroscopic view observation, including coal wall caving, vexed pier, roof cracking, goaf hanging deck and inbreak, pumping plant pressure
Power, two gate road roof delamination amounts etc..On this basis, the KJ216 type top board dynamic monitoring system that my ore mining is advanced, often
Install a set of every ten framves, the working resistance Changing Pattern of zoning monitoring work surface inner support and relief valve open frequency, find top
Plate mechanics and periodic weighting step pitch, gathered by ore deposit pressure chamber, arrange ore deposit pressure data, analyzes, adds up ore deposit pressure data, presses according to ore deposit
Analyze, in conjunction with work surface macroscopic view observed case, it is contemplated that first and periodic weighting step pitch, issue work surface weighting length in time, for
Prevent bump generation with having emphasis provides foundation.
Through proximal surface (8103 work surface) back production experience and the long-term observation to this work surface, find the cycle of this work surface
Water component average out to 22 meters, when pressing, working resistance of support maximum can reach 5950KN, and top, the base plate maximum amount of shifting near are
90mm, and with vexed pier, there is the bending of pucking, advance support girder steel, working face wall wall caving in two gate road advance support sections
Deng, based on this, work surface is in progradation, when adopting to about 15 meters at last time periodic weighting, closely observe work surface,
Two gate road strata behaviors situations also combine the data analysis of monitoring system, further determine that whether top board presses, with
Just correlative protection measure is taked.
After taking KJ216 type top board dynamic monitoring system, the research to the working resistance Changing Pattern of work surface inner support
More scientific, no longer as dependence experience the most blindly, meanwhile, for the first time relief valve open frequency is made research, and tie
Closing work surface macroscopic view observed case, the prediction to Rule of roof movement of coal and periodic weighting step pitch is more accurate, has had sector more
Add the directive significance of reality.
5, Controlling of Coal Outburst technology
1. hole destressing method
Boring destressing method is that utilization boring reduces the elasticity energy accumulating in coal seam, is that the one of the elastic energy of release has efficacious prescriptions
Method.
My ore mining large aperture pressure relief vent, from the beginning of two gate road first advance 30 meters, help at gate road two, away from
Roadway floor 0.6 meter adopts line with 500mm spacing construction φ=108mm, the pressure relief vent of L=8000mm to stopping successively, opens at work surface
When adopting, it is ensured that the construction first advance of pressure relief vent more than 200 meters, relatively concentrate because two gate roads face empty side one lateral stress, for
Avoid the occurrence of accident, therefore with loess sealing of hole 1 meter after facing the side pressure relief vent construction of empty side.
After pressure relief vent construction, along with the continuous propelling of work surface, a bearing capacity moves forward with certain speed equally, when
When arriving pressure relief vent position, if a bearing capacity is less than the stability of hole wall, hole wall does not destroys；When a bearing capacity surpasses
When crossing the stability of hole wall, hole wall deformation, a bearing capacity is the highest, and hole wall damage envelope is bigger, further illustrates, Tunnel Pressure
Shifted, discharged.
2. base plate relieving shot
From the beginning of two gate road first advance 60 meters, two gate roads successively with 1000mm spacing construction φ=
The blast hole of 42mm, L=2000mm adopts line to stopping, and wherein, fortune faces empty side 300mm along crossheading borehole blasting pitch-row, quick-fried in air return way
Holes is away from facing empty side 500mm, and blast hole fills 3 grades of coal mine allowable powdered emulsified explosives of volume three φ=35mm, L=200mm, in work
During the exploitation of face, it is ensured that the construction first advance of pressure relief vent more than 200 meters, relatively collect because two gate roads face empty side one lateral stress
In, for avoiding the occurrence of accident, therefore use loess sealing of hole 1 meter after facing the side pressure relief vent construction of empty side, the construction of blast hole is at work surface
Before back production the most complete.
Behind construction relieving shot hole, being affected by lead abutment pressure, the base plate before loosened gradually is compacted, and illustrates, pressure
Power has obtained effective release, and Floor Heave in Roadway degree substantially weakens.
3. coal-bed flooding method
The purpose of coal-bed flooding mainly reduces elasticity and the intensity of coal body, in making the coal rock layer marginal zone of work surface reduce
Portion's cohesive force, reduces its elasticity, reduces its potential.
8101 work surfaces use elongated hole, two-way water floods, two gate road work surfaces side at roadway floor 1.5 meters with
Punching along seam inclination direction in 20 meters of spacing multiple operation faces, hole depth is that (1/3) ÷ the Cos γ, γ of face length are for holing
Angle, i.e. hole depth=42 meter, bore angle γ=α-θ,
α-seam inclination, takes 3 °；
Along angle under θ-boring maximum, typically take 0.2～0.5 °, at this, take 0.5 °；
Finally, bore angle γ=2.5 °.
The spacing of wells is the width that water moistens coal body, and empirically value takes 20 meters
The distance X=Te S+M of water filling first advance
Te-water filling natural law, S-work surface day advance rate, take 4 meters, M-stops the boring distance away from work surface during water filling, takes
70 meters～80 meters
It is computed X=90 rice.
The distance of water filling first advance must assure 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, the experience in should putting into practice according to water loss rate during water filling, the porosity of coal body and water filling
Determine, typically take 0.03m3/t；
L-face length/2；M-coal seam thickness, takes 3.56 meters；γ-coal seam unit weight, takes 1.34t/m3；Between B-water injection hole
Away from.
Water injection time t=Q/60 S,
Q-single hole water injection rate；S-injection flow, takes 0.1m3/min。
Water injection pressure 5MPa, uses water injection hole packer sealing of hole.
Table 2 is water injection hole parameter.
Table 2
After the contrast of coal seam forward and backward to the water filling index of correlation, analyzing, before discovery water filling, seam hardness coefficient is 4, after water filling
It is 2.85, it can be seen that, water filling can reduce coal rock layer hardness, makes coal petrography soft moistening, reduces elasticity, thus reduces coal seam and amass
The probability of cumulative.
In 8101 work surface erosion controls work, in strict accordance with erosion control six word policy, i.e. " survey, unload, prop up, break, protect, keep away ", work
Making face production period, pedestrian is forbidden in 5101 lanes, and hangs " dangerous, to forbid to individually enter " board plate at 5101 lane damper positions,
When work surface stops production for some reason, when stopping adopting, it is necessary to avoid periodic weighting position, meanwhile, improving advance support quality, and propping up in advance
Protective material all uses flexible support material, and two gate roads all use anchor, net, band support pattern when driving, stops to use just
Property supporting.
During 8101 working face minings, only in 170 meters of 5101 lane, press with there occurs 2 Secondary Shocks at 180 meters, and all
Accurately, there is not personnel casualty accidents in prediction, these benefit from taking of above-mentioned measure.
Meanwhile, work surface carrying out oblique adjusting and also can avoid the outstanding top of top board large area, its principle is, by work surface and two crossheadings
Tunnel oblique, the oldest top-hung top is trapezoidal, the principle of the section of breaking when reaching Limit Span according to top board, and old the disrumpent feelings of top will be unlikely
Cause work surface to press comprehensively, the possibility that induction bump occurs can be reduced to a certain extent.Secondly by advanced crossheading
In in, sensor is buried in gun drilling underground, monitors the continuous propelling along with exploitation, the Soft soil treatmen of lead abutment pressure, a pressure-bearing
Power peak value, supporting pressure spikes position and speed of advancement etc., for advance support scope and prevent bump with having emphasis
Generation provide foundation.To the monitoring of bump, preventing and treating, new technique is necessary tests in my ore deposit, promote for these.
6, the position of terminal mining line is determined
For avoiding periodic weighting, i.e. foundation stops adopting line-spacing last time periodic weighting (2/5) L～(3/5) L(L is periodic weighting
Step pitch) principle determine the position of terminal mining line, i.e. stop to adopt line-spacing last time periodic weighting 7 meters～10.5 meters.
Thus, determine 2101 Ting Cai positions, lane away from once at periodic weighting 9 meters, after work surface oblique adjusting, 5101 lanes stop adopting
Position away from once periodic weighting 7.5(9+19.5-21) at rice, two crossheading the position of terminal mining lines meet the requirements.Wherein, 6# support
～84# support is undesirable, 52# support is positioned at periodic weighting.
7, work surface ending oblique adjusting
In order to improve resource recovery, determine at work surface the position of terminal mining line, carry out oblique adjusting, for transporting during ensureing oblique adjusting
Defeated unimpeded, whirler tail end centered by work surface head end, it is contemplated that the cut scope of coal-winning machine, determine work surface after oblique adjusting
Length increases by 1.5 meters, and i.e. after oblique adjusting, face length is 127.5 meters, stops adopting 19.5 meters, advanced head termination, tail termination, place,
During oblique adjusting, for having managed top board, quick oblique adjusting, " length ", " short " cutter is used to intert coal cutting, owing to head is without advance rate, for
Prevent conveyer and support glide, on alter, squeeze frame, the problem such as fall apart, when cutting short sword, moving conveyor is at unit sky cutter row
Carry out when entering；When cutting rimmer knife, it is normally carried out moving conveyor, and conveyer along full face straightening and is cut neat rib, Quan Gong
Make face support alinement, lay a solid foundation for next corner.Fig. 2 is that oblique adjusting schematic diagram is adopted at work surface end.After work surface oblique adjusting,
6# support～84# support do not meet and stop adopting line and stop setting requirement, and 52# support is positioned at periodic weighting.To this end, during oblique adjusting when
When unit is advanced into this region, using and wipe heading tape pressure and time shift frame, support drops less and draws soon, and guarantees that support setting load is qualified.Work
Make face oblique adjusting and make the many coal mining outputs in my ore deposit 0.58 ten thousand tons, not only increase resource recovery, alleviate the most to a certain extent simultaneously
The tensity of Linking up digging.
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 surface two crossheading construction dewatering orifice, release work surface both sides water in gob area, and by this
One process is continued for working face extraction terminating, and drains into wellhole by crossheading drain pipe, collection middle orbit lane drain pipe, when
The advance of the face, to time at osculum 10 meters, is closed this osculum immediately, is opened next row water hole, carry out successively；
Using panel compartment drainage, i.e. when a panel carries out draining, other panels stop draining；
B, prevent top board large area from pressing
Work surface uses spontaneous caving to hold concurrently two ends artificial overhead caving controlroof, simultaneously according to Face Ground Pressure Behavior feelings
Condition, moves back anchor to the roof timbering of two ends,
C, Controlling of Coal Outburst
Use the method that boring platen press, base plate pressure explosion and coal-bed flooding method combine,
Boring destressing method, uses large aperture pressure relief vent, from the beginning of two gate road first advance 30 meters, at gate road two
Side, adopt line to stopping, in work with 500mm spacing construction φ=108mm, the pressure relief vent of L=8000mm successively away from roadway floor 0.6 meter
During the exploitation of face, it is ensured that the construction first advance of pressure relief vent more than 200 meters, after facing the side pressure relief vent construction of empty side, use loess sealing of hole
1 meter；
Base plate relieving shot, from the beginning of two gate road first advance 60 meters, at two gate roads successively with 1000mm spacing
Construction φ=42mm, the blast hole of L=2000mm adopt line to stopping, and wherein, fortune faces empty side 300mm, return air along crossheading borehole blasting pitch-row
Crossheading borehole blasting pitch-row faces empty side 500mm；
Coal-bed flooding method, with elongated hole, two-way water flood, helps at roadway floor 1.5 meters at two gate road work surfaces with 20 meters
Spacing multiple operation face carries out water filling along the punching of seam inclination direction；
D, determine the position of terminal mining line
For avoiding periodic weighting, i.e. determine according to the principle stopping adopting line-spacing last time periodic weighting (2/5) L～(3/5) L and stop adopting
Line position, L is periodic weighting step pitch；
E, work surface ending oblique adjusting
Oblique adjusting is carried out at work surface the position of terminal mining line, whirler tail end centered by work surface head end, work surface after oblique adjusting
Length increases by 1.5 meters, during oblique adjusting, uses " length ", " short " cutter to intert coal cutting, owing to head is without advance rate, for preventing out
Existing conveyer and support glide, on alter, squeeze frame, the problem such as fall apart, when cutting short sword, moving conveyor enters when unit sky cutter is advanced
OK；When cutting rimmer knife, being normally carried out moving conveyor, and along full face straightening and conveyer is cut neat rib, full face is propped up
Frame alinement.
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| CN106767213A (en) * | 2017-01-18 | 2017-05-31 | 长沙有色冶金设计研究院有限公司 | A kind of Roof Control blasting method of soft broken top board ore body back production |
| CN107575229A (en) * | 2017-09-26 | 2018-01-12 | 山东科技大学 | A kind of class house pillar type coal mining method cut top filling and close on goaf |
| 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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