CN109209493A - A kind of leting speeper method of seam mining under thick loess grouting goaf - Google Patents
A kind of leting speeper method of seam mining under thick loess grouting goaf Download PDFInfo
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- CN109209493A CN109209493A CN201811269922.7A CN201811269922A CN109209493A CN 109209493 A CN109209493 A CN 109209493A CN 201811269922 A CN201811269922 A CN 201811269922A CN 109209493 A CN109209493 A CN 109209493A
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- 238000005065 mining Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 152
- 238000005553 drilling Methods 0.000 claims abstract description 89
- 239000003245 coal Substances 0.000 claims abstract description 54
- 230000004888 barrier function Effects 0.000 claims abstract description 15
- 238000007599 discharging Methods 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims abstract description 12
- 239000002002 slurry Substances 0.000 claims description 26
- 244000005700 microbiome Species 0.000 claims description 23
- 239000000843 powder Substances 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 239000000243 solution Substances 0.000 claims description 13
- 235000015097 nutrients Nutrition 0.000 claims description 12
- 239000006260 foam Substances 0.000 claims description 9
- 241000193395 Sporosarcina pasteurii Species 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 8
- 230000000737 periodic effect Effects 0.000 claims description 6
- 239000003818 cinder Substances 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- 241000726221 Gemma Species 0.000 claims description 2
- 241000894006 Bacteria Species 0.000 claims 1
- 230000009172 bursting Effects 0.000 description 7
- 238000000605 extraction Methods 0.000 description 4
- 241000193830 Bacillus <bacterium> Species 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 230000002269 spontaneous effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000003643 water by type Substances 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
-
- 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
- E21F16/00—Drainage
-
- 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
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
-
- 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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Earth Drilling (AREA)
Abstract
The present invention relates to mine shaft geology fields, a kind of leting speeper method of seam mining under thick loess grouting goaf is disclosed, implement to drill to goaf in the tunnel for wanting working seam to be formed, and passes through the thickness D of distance L and yellow mud at the top of the water surface distance yellow mud in drilling observation goaf；Drilling by not disclosing yellow mud directly discharges water, and implements sealing of hole to the drilling for not disclosing yellow mud after discharging water；The unrestrained water of electrical haulage is used from the drill hole for disclosing yellow mud；After the drilling of exposure yellow mud discharges water, the drilling for disclosing yellow mud is reinforced；In goaf, same level implements hole of intercepting water upwards, and the purpose of horizon for the hole implementation that intercepts water is water barrier；Seam mining process is implemented to monitor to issue, and after finding issue, to issue, section is reinforced between goaf and coal seam, then pushes through issue, issue is made to enter compacting zone.The present invention has the characteristics that simple easily implementation, the prominent mud risk of nothing and analysis of possibility of water inrush can be effectively reduced.
Description
Technical field
The present invention relates to mine shaft geology field, there is certain intersect more particularly to a kind of yellow mud fills with safety engineering field
Starch the leting speeper method of seam mining under goaf.
Background technique
Coal in China exploitation is generally threatened by water damage, and water damage is to be only second to the second largest disaster of Gas Disaster at present.Water damage
Serious coal mine, water damage usually can be according at casualties and large amounts of economic loss.Therefore, coal mining engineering must be opened
Open up water damage preventing and controlling.
But it may be influenced simultaneously by water and fiery two kinds of disasters when coal mining, and goaf caused by coal mining is residual
Cinder is stayed to need to cover goaf with yellow mud.Once yellow mud covers goaf, when lower seam mining, just faces following problems:
1) do not implement leting speeper engineering, gushing water may be faced, mud accident of bursting, cause lower seam mining dangerous, and original
Yellow mud covers seam mining time under not overall regions and goaf oxygen is caused to increase, and has heterogeneous goaf risk.
2) use traditional handicraft leting speeper, by yellow mud it is some or all of it is unrestrained fall, may cause heterogeneous goaf, cause
Goaf safety accident.
3) it will cause new water burst situation under when seam mining, the stronger water burst of power may carry the substances such as yellow mud and cause
Gushing water, prominent mud accident, cause lower seam mining dangerous.
If 4) inject the chemical substances such as cement to reinforce yellow mud, the excessively high initiation coal of chemical reaction temperature may cause certainly
Combustion, causes goaf safety accident.
Summary of the invention
The present invention to solve the above-mentioned problems, provides a kind of leting speeper method of seam mining under thick loess grouting goaf.
The technical solution adopted by the invention is as follows:
The leting speeper method of seam mining, includes the following steps: under a kind of thick loess grouting goaf
Step 1: implementing to drill in the tunnel that the coal seam to be exploited is formed to goaf, and mined out by drilling observation
The thickness D of the distance L and yellow mud at the top of water surface distance yellow mud in area；Wherein, drilling be divided into do not disclose yellow mud drilling and
Disclose the drilling of yellow mud；
Step 2: the drilling by not disclosing yellow mud directly discharges water, and implements after discharging water to the drilling for not disclosing yellow mud
Sealing of hole；
Step 3: the unrestrained water of electrical haulage is used from the drill hole for disclosing yellow mud；
Step 4: disclose yellow mud drilling discharge water after, to disclose yellow mud drilling reinforce；
Step 5: in goaf, same level implements hole of intercepting water upwards, and the purpose of horizon for the hole implementation that intercepts water is water barrier, every
Water layer is the stratum between the fissure zone that goaf is formed and the water-bearing layer that may pour in exploitation space with water isolating；
Step 6: seam mining process is implemented to monitor to issue, after finding issue, to issue in goaf and coal
Section is reinforced between layer, then pushes through issue, issue is made to enter compacting zone.
In step 1, do not disclose the drilling of yellow mud construction depth be well cuttings see after cinder in goaf 3
~5 meters；The construction depth of the drilling of exposure yellow mud is 3~5 meters after exposing yellow mud；By the drilling and exposure that do not disclose yellow mud
The distance L at the top of water surface distance yellow mud in the drilling observation goaf of yellow mud；Yellow mud is observed in drilling by disclosing yellow mud
Thickness D.
In step 1, when implementing to drill to goaf in the tunnel that the coal seam to be exploited is formed, in the same water in goaf
The spacing of flat adjacent drilling is at 5~20 meters.
In step 2, the drilling of the yellow mud first lower filter screen before discharging water is not disclosed, does not disclose yellow mud to each during discharging water
Drilling flow control valve is set, the volume ratio for controlling the yellow mud of outflow and the water of outflow is less than D/L.
The detailed process of step 3 are as follows: disclose the drilling of yellow mud first by the Free water on yellow mud it is unrestrained fall, then by taking off
Electrode is arranged in the drilling for revealing yellow mud, makes the combination water inside yellow mud gradually unrestrained by voltage difference.
Electric current is not more than 100mA in yellow mud.
In step 4, disclose yellow mud drilling discharge water after injection microorganism slurries reinforce, microorganism slurries include Pasteur's bud
Spore bacillus, nutrient solution and IR fluorescence powder, wherein Bacillus pasteurii and nutrient solution volume ratio are 1:1~1:2, infrared glimmering
Light powder accounts for the 1%~5% of Bacillus pasteurii and nutrient solution gross mass；Microorganism slurries use intermittent injection mode, and lead to
The drilling monitoring temperature for disclosing yellow mud is crossed, temperature is higher than 50 DEG C of stopping injections, then injects fire extinguishing foam higher than 70 DEG C, be lower than 50
DEG C microorganism slurries are reinjected, until grouting pressure is not less than 0.5MPa；Drilling after injecting microorganism slurries, to yellow mud is disclosed
Sealing of hole.
In step 6, seam mining process implements infrared monitoring to issue, finds the IR fluorescence being mixed into yellow mud
When powder, to issue, section uses rapid hardening slurries to reinforce between goaf and coal seam.
In step 5, fissure zone and the interval in the water-bearing layer that may pour in exploitation space that water barrier is formed using goaf
Aqueous stratum that can be best；Periodic weighting step pitch where water barrier in level, when the adjacent pitch of holes that intercepts water is less than seam mining.
In step 2 and step 4, the standard for the end that discharges water is that 90% or more water decaying or flow discharges are less than
0.1m3/h。
Compared with prior art, the beneficial effects of the present invention are:
The lane that the leting speeper method of seam mining is first formed in the coal seam to be exploited under thick loess grouting goaf of the invention
Implement to drill to goaf in road, to determine the yellow mud and ponding situation in yellow mud covering goaf；Then to there is yellow mud
Region, it is unrestrained to the static reserve of water by the drilling for not disclosing yellow mud, but yellow mud cannot be taken out of, when Free water is unrestrained
Afterwards, need to inside yellow mud water carry out it is unrestrained, be on the one hand to reinforce yellow mud, be on the other hand to drain.Due to Huang
Mud is cohesive soil, water poor fluidity wherein, therefore the present invention uses the unrestrained water of electrical haulage, guidance from the drill hole for disclosing yellow mud
Water flow discharge.Further to reinforce yellow mud, disclose yellow mud drilling discharge water after, the drilling for disclosing yellow mud is reinforced.
The implementation Kong Ze that intercepts water is in order to prevent under river channels, and yellow mud is carried into the exploitation space in coal seam, causes mud accident of bursting.
To sum up, when coal mining, 3 faced are big dangerous, i.e., the danger of coal seam gushing water, the routed mud in coal seam and goaf fire are interrelated, phase
It mutually influences, conventional improvement prevention and treatment is restricted, it is necessary to which adopting method comprehensive treatment of the invention could integrated control.
Detailed description of the invention
Fig. 1 is flow chart of the invention；
Fig. 2 is leting speeper structural schematic diagram of the present invention.
In figure: the coal seam 1-；2- does not disclose the drilling of yellow mud；3- yellow mud；The drilling of 4- exposure yellow mud；5- water barrier；6- is split
Gap band；The water-bearing layer 7-；The goaf 8- same level；9- intercepts water hole；The goaf 10-.
Specific embodiment
It is next with reference to the accompanying drawings and examples that the present invention is further illustrated.
Referring to Figures 1 and 2, under thick loess grouting goaf of the invention seam mining leting speeper method, including following steps
It is rapid:
Step 1: implement leting speeper and be bored into destination layer position.Detailed process are as follows: in the tunnel that the coal seam 1 to be exploited is formed
Middle to implement to drill to goaf 10, in goaf same level 8, the adjacent spacing of wells is at 5~20 meters.Drilling, which is divided into, not to be disclosed
The drilling 2 of yellow mud and the drilling 4 for disclosing yellow mud.The construction depth for not disclosing the drilling 2 of yellow mud is that well cuttings sees goaf
3~5 meters after cinder in 10.The construction depth for disclosing the drilling 4 of yellow mud is to expose after yellow mud 3~5 meters.By not disclosing yellow mud
Drilling 2 and disclose the drilling 4 of yellow mud and observe the distance L at the top of water surface distance yellow mud 3 in goaf 10.By disclosing yellow mud
Drilling 4 observe yellow mud 3 thickness D.
Step 2: the drilling 2 for not disclosing yellow mud, which directly discharges water, is then injected into fire extinguishing foam and sealing of hole.Wherein, it does not disclose
The drilling 2 of yellow mud first lower filter screen before discharging water, prevents all kinds of sundries from pouring in.To each drilling for not disclosing yellow mud during discharging water
The volume ratio of 2 setting flow control valves, the water of yellow mud 3 and outflow through control outflow is less than D/L.The standard of end of discharging water is water
90% or more amount decaying or flow discharges are less than 0.1m3/h。
Step 3: the drilling 4 for disclosing yellow mud uses the unrestrained water of electrical haulage.The drilling 4 for mainly comprising the processes of exposure yellow mud first will
Free water on yellow mud 3 is unrestrained, then arranges electrode by disclosing the drilling 4 of yellow mud, the combination water inside yellow mud 3 is allowed to pass through electricity
Pressure difference is gradually unrestrained.Wherein, electric current should be less than 100mA in yellow mud 3.Discharge water end standard be water decaying 90% or more, or
Flow discharges are less than 0.1m3/h。
Step 4: disclose yellow mud drilling 4 discharge water after injection microorganism slurries reinforce.Mainly comprise the processes of microorganism slurries
Including Bacillus pasteurii, nutrient solution and IR fluorescence powder, wherein Bacillus pasteurii and nutrient solution volume ratio be 1:1~
1:2, IR fluorescence powder account for the 1%~5% of Bacillus pasteurii and nutrient solution gross mass；By several groups when prepared by microorganism slurries
Divide and requires to mix according to dosage.Microorganism slurries use intermittent injection mode, and the drilling 4 by disclosing yellow mud monitors
Temperature, temperature are higher than 50 DEG C of stopping injections, then inject fire extinguishing foam higher than 70 DEG C, reinject microorganism slurries lower than 50 DEG C,
Until grouting pressure is greater than 0.5MPa.After injecting microorganism slurries, to 4 sealing of hole of drilling for disclosing yellow mud, after sealing of hole, 7 days or more
It can carry out the exploitation of coal seam 1.
Step 5: goaf same level 8 implements hole 9 of intercepting water upwards.The purpose of horizon that hole 9 is implemented that intercepts water is water barrier 5.
Water barrier 5 is the ground that water isolating is best between the fissure zone 6 that goaf 10 is formed and the water-bearing layer 7 that may pour in exploitation space
Layer.The water isolating on each stratum is obtained by coalfield phase of exploration.Adjacent 9 spacing of hole that intercepts water should be less than in level where water barrier 5
Periodic weighting step pitch when coal seam 1 is exploited.Periodic weighting step pitch when coal seam 1 is exploited can be obtained by similar mining geological conditions analogy
?.
Step 6: 1 recovery process of coal seam implements infrared monitoring to issue.There is issue in 1 recovery process of coal seam, adopts
Use ultra red monitor.It was found that be mixed into yellow mud 3 IR fluorescence powder when, to issue between goaf 10 and coal seam 1 section
It is reinforced using rapid hardening slurries, then quickly issue is pushed through, makes it into compacting zone.
Step 7: safety coal extraction coal seam 1.Safety coal extraction coal seam 1, there is no large area gushing waters, mud accident of bursting.
The operation logic of the leting speeper method of seam mining is as follows under thick loess grouting goaf of the present invention:
When coal mining, this kind of engineerings face 3 big dangerous, i.e., 1 gushing water of coal seam is dangerous, coal seam 1 is burst mud and mined out simultaneously
10 fire of area.Traditional handicraft in order to anti-goaf 10 fire, it is necessary to goaf 10 is sealed using yellow mud 3, but this is necessarily caused
Other two kinds of danger.Therefore, it is necessary to coordinate the preventing and controlling of 3 kinds of disasters.The case where first reconnoitring goaf 10, due to goaf 10
Randomness, interior yellow mud 3 is unevenly distributed, and the exploitation of coal seam 1 will cause the oxygen supply of goaf 10 and increase, and fire needs to prevent,
Therefore fire extinguishing foam to be added at no yellow mud, bubble mobility is poor compared with water, and the ability for carrying other substances is also poor, this
Composite defense has been carried out simultaneously to gushing water and routed mud accident while fire extinguishing.In addition, needing the region for having yellow mud 3 to water
Static reserve it is unrestrained, but yellow mud 3 cannot be taken out of, it is therefore desirable to control water velocity and guarantee water on unrestrained yellow mud 3
Guarantee that yellow mud 3 is not largely lost simultaneously.After Free water is unrestrained, need to inside yellow mud 3 water carry out it is unrestrained, this aspect is
It is on the other hand to drain to reinforce yellow mud 3.Since yellow mud 3 is cohesive soil, water poor fluidity wherein, it is therefore desirable to
Apply an electrical haulage, guidance water flow excludes.Further to reinforce yellow mud 3, using microorganism grouting and reinforcing, because coal seam is 50
DEG C or less without obvious spontaneous combustion tendency and there are certain safety coefficients, then need to take measures higher than 70 DEG C.Implementation intercepts water hole 9 then
It is in order to prevent under river channels, yellow mud 3 is carried into the exploitation space in coal seam 1, causes mud accident of bursting, and yellow mud 3 one
Denier enters on a large scale, and wherein the mixed IR fluorescence powder of slip casting can play forewarning function, effectively controls gushing water, mud accident of bursting
Generation.To sum up, 3 kinds of disasters are interrelated, influence each other, and conventional improvement prevention and treatment is restricted, it is necessary to comprehensive using new method
It closes and administers ability integrated control.In conclusion the present invention includes 1) simple easily implementation；2) to no yellow mud overlay area using bubble
Foam fire prevention is without mud risk of dashing forward；3) work that discharges water is implemented, and controls dynamic water water source, analysis of possibility of water inrush is effectively reduced；4) it reinforces mined out
Area's yellow mud uses microbial material, and no chemical reaction effectively controls residual problem caused by engineering；5) yellow mud is reinforced, effectively
Reduce the risk of prominent mud.
Embodiment:
Certain mine will exploit No. 3 coal seams, there is a goaf on No. 3 coal seams, which is formed by No. 2 coals of exploitation, and No. 2
Coal seam is that easily spontaneous progress uses at it to prevent No. 2 spontaneous combustion of coals and carried out thick loess grouting engineering inside area, is in the milk
Main component is loess.Gushing water does not occur for No. 3 coals of exploitation, mud disaster of bursting, goaf fire does not occur, to No. 2 coal minings yet
The goaf of formation carries out leting speeper, and steps are as follows:
Step 1: implement leting speeper and be bored into destination layer position.To goaf in the tunnel that No. 3 coal seams being exploited are formed
Implement drilling, the adjacent spacing of wells of same level implements 34 drillings at 5~20 meters altogether in goaf.Drilling, which is divided into, does not take off
Reveal the drilling of yellow mud and discloses the drilling of yellow mud.The construction depth for not disclosing the drilling of yellow mud is that well cuttings is seen in goaf
Cinder after 3~5 meters.The construction depth for disclosing the drilling of yellow mud is to expose after yellow mud 3~5 meters.By the brill for not disclosing yellow mud
The distance L that hole and the drilling for disclosing yellow mud are observed at the top of the water surface distance yellow mud in goaf is 0.6~5.8 meter.Pass through exposure
The thickness D of drilling (4) observation yellow mud (3) of yellow mud is 0.3~2.1 meter.
Step 2: the drilling for not disclosing yellow mud, which directly discharges water, is then injected into fire extinguishing foam and sealing of hole.Wherein, Huang is not disclosed
The drilling of mud first lower filter screen before discharging water, prevents all kinds of sundries from pouring in.Each drilling for not disclosing yellow mud is set during discharging water
Flow control valve is set, the volume ratio of the water of yellow mud and outflow through control outflow is less than D/L.The standard of end of discharging water is that water declines
More than subtracting 90% or water is less than 0.1m3/h.By taking No. 2 drilling as an example, L 1m, D 1.4m, using flow control valve outflow
The volume ratio of yellow mud and flow field water controls within 1.4:1, until flow discharges are less than 0.1m3/h。
Step 3: the drilling of yellow mud is disclosed using the unrestrained water of electrical haulage.The drilling of yellow mud is disclosed first by the freedom on yellow mud
Water is unrestrained, then arranges electrode by disclosing the drilling of yellow mud, makes the combination water inside yellow mud gradually unrestrained by voltage difference.Its
In, electric current should be less than 100mA in yellow mud.Discharge water end standard be water decaying 90% or more or flow discharges be less than
0.1m3/h。
Step 4: disclose yellow mud drilling discharge water after injection microorganism slurries reinforce.Microorganism slurries include Pasteur's gemma
Bacillus, nutrient solution and IR fluorescence powder, wherein Bacillus pasteurii and nutrient solution volume ratio are 1:1, and IR fluorescence powder accounts for bar
The 5% of family name bacillus and nutrient solution gross mass.Microorganism slurries use intermittent injection mode, and the brill by disclosing yellow mud
Hole monitoring temperature, temperature are higher than 50 DEG C of stopping injections, then inject fire extinguishing foam higher than 70 DEG C, reinject microorganism lower than 50 DEG C
Slurries, until grouting pressure is greater than 0.5MPa.After injecting microorganism slurries, to the drilling and sealing for disclosing yellow mud, after sealing of hole 7 days with
It is upper just to carry out seam mining.By taking No. 5 drilling as an example, microorganism slurries 18.9m is injected3After monitor that temperature reaches 53 DEG C and stops
It only injects, continues monitoring and reached 72 DEG C and then inject fire extinguishing foam, be reduced to 38 DEG C, continue injection until grouting pressure is greater than
0.5MPa.Just carry out seam mining within 7 days or more after sealing of hole.
Step 5: goaf same level implements hole of intercepting water upwards, amounts to 38.Intercept water hole implementation purpose of horizon be every
Water layer.Water barrier is the ground that water isolating is best between the fissure zone that goaf is formed and the water-bearing layer that may pour in exploitation space
Layer.Water barrier shares 3, and obtaining No. 2 water barriers by coalfield phase of exploration is that preferably (infiltration coefficient is minimum for mud stone water-resisting property
1.5×10-8m/s).Periodic weighting step pitch when the adjacent pitch of holes that intercepts water should be less than seam mining in level where water barrier.Coal
Periodic weighting step pitch when layer exploitation can similar mining geological conditions (directly to push up similar with coal winning technology) analogy acquisition be 18m.
Step 6: seam mining process implements infrared monitoring to issue.There is issue during seam mining, uses
Ultra red monitor.It was found that be mixed into yellow mud IR fluorescence powder when, to issue between goaf and coal seam section using speed
Solidifying slurries are reinforced, and are then quickly pushed through issue, are made it into compacting zone.By taking No. 4 projective water points monitored as an example, No. 4 prominent
Water spot water yield is 32m3/ h carries out ultra red monitor to it and starts and no abnormal, although water yield increases to 48m3/h
It was found that ultra red monitor is abnormal, that is, the IR fluorescence powder being mixed into yellow mud.Stop coal mining and attached to No. 4 projective water points at once
8 mouthfuls of drilling is implemented in position to nearly No. 2 water proofs layer by layer, and injects accelerated cement and waterglass, passes through grouting and reinforcing, No. 4 projective water point water bursts
Amount is reduced to 8m3/ h has no ultra red monitor exception.No. 4 projective water points of Rapid Popularization, after making it into compacting zone, phase does not occur
Close disaster.
Step 7: No. 3 coal seams of safety coal extraction.Safety coal extraction coal seam, there is no large area gushing waters, mud accident of bursting.
Claims (10)
1. a kind of leting speeper method of seam mining under thick loess grouting goaf, which comprises the steps of:
Step 1: implementing to drill in the tunnel that the coal seam to be exploited (1) is formed to goaf (10), and is adopted by the observation that drills
The thickness D of the distance L and yellow mud (3) at the top of water surface distance yellow mud (3) in dead zone (10)；Wherein, drilling, which is divided into, does not disclose
The drilling (2) of yellow mud and the drilling (4) for disclosing yellow mud；
Step 2: the drilling (2) by not disclosing yellow mud directly discharges water, real to the drilling (2) for not disclosing yellow mud after discharging water
Apply sealing of hole；
Step 3: the unrestrained water of electrical haulage is used at the drilling (4) for disclosing yellow mud；
Step 4: disclose yellow mud drilling (4) discharge water after, to disclose yellow mud drilling (4) reinforce；
Step 5: in goaf, same level (8) is implemented to intercept water hole (9) upwards, and the purpose of horizon that hole of intercepting water (9) implement is water proof
Layer (5), water barrier (5) are that have between the fissure zone (6) that goaf (10) are formed and the water-bearing layer (7) that may pour in exploitation space
There is the stratum of water isolating；
Step 6: coal seam (1) recovery process is implemented to monitor to issue, after finding issue, to issue in goaf (10)
Section is reinforced between coal seam (1), then pushes through issue, issue is made to enter compacting zone.
2. the leting speeper method of seam mining under a kind of thick loess grouting goaf according to claim 1, which is characterized in that
In step 1, do not disclose the drilling (2) of yellow mud construction depth be well cuttings see after cinder in goaf (10) 3~
5 meters；The construction depth of the drilling (4) of exposure yellow mud is 3~5 meters after exposing yellow mud；By do not disclose yellow mud drilling (2) and
Disclose the distance L at the top of the water surface distance yellow mud (3) in drilling (4) observation goaf (10) of yellow mud；By disclosing yellow mud
The thickness D of drilling (4) observation yellow mud (3).
3. the leting speeper method of seam mining under a kind of thick loess grouting goaf according to claim 1, which is characterized in that
In step 1, when implementing to drill to goaf (10) in the tunnel that the coal seam to be exploited (1) is formed, in goaf same level
(8) spacing of adjacent drilling is at 5~20 meters on.
4. the leting speeper method of seam mining under a kind of thick loess grouting goaf according to claim 1, which is characterized in that
In step 2, the drilling (2) of the yellow mud first lower filter screen before discharging water is not disclosed, to each drilling for not disclosing yellow mud during discharging water
(2) flow control valve is set, and the volume ratio for controlling the yellow mud of outflow and the water of outflow is less than D/L.
5. the leting speeper method of seam mining under a kind of thick loess grouting goaf according to claim 1, which is characterized in that
The detailed process of step 3 are as follows: disclose the drilling (4) of yellow mud first by the Free water on yellow mud (3) it is unrestrained fall, then pass through exposure
Electrode is arranged in the drilling (4) of yellow mud, and the combination water for making yellow mud (3) internal is gradually unrestrained by voltage difference.
6. the leting speeper method of seam mining under a kind of thick loess grouting goaf according to claim 5, which is characterized in that
Electric current is not more than 100mA in yellow mud (3).
7. the leting speeper method of seam mining under a kind of thick loess grouting goaf according to claim 1, which is characterized in that
In step 4, disclose yellow mud drilling (4) discharge water after injection microorganism slurries reinforce, microorganism slurries include Pasteur's gemma bar
Bacterium, nutrient solution and IR fluorescence powder, wherein Bacillus pasteurii and nutrient solution volume ratio are 1:1~1:2, IR fluorescence powder
Account for the 1%~5% of Bacillus pasteurii and nutrient solution gross mass；Microorganism slurries use intermittent injection mode, and by taking off
Reveal drilling (4) monitoring temperature of yellow mud, temperature is higher than 50 DEG C of stopping injections, then injects fire extinguishing foam higher than 70 DEG C, be lower than 50
DEG C microorganism slurries are reinjected, until grouting pressure is not less than 0.5MPa；Drilling after injecting microorganism slurries, to yellow mud is disclosed
(4) sealing of hole.
8. the leting speeper method of seam mining under a kind of thick loess grouting goaf according to claim 7, which is characterized in that
In step 6, coal seam (1) recovery process implements infrared monitoring to issue, finds the IR fluorescence powder being mixed into yellow mud (3)
When, to issue, section uses rapid hardening slurries to reinforce between goaf (10) and coal seam (1).
9. the leting speeper method of seam mining under a kind of thick loess grouting goaf according to claim 1, which is characterized in that
In step 5, the fissure zone (6) that water barrier (5) is formed using goaf (10) and the water-bearing layer (7) that exploitation space may be poured in
Between the best stratum of water isolating；Where water barrier (5) in level, when adjacent hole of intercepting water (9) spacing is less than coal seam (1) exploitation
Periodic weighting step pitch.
10. the leting speeper method of seam mining, feature exist under a kind of thick loess grouting goaf according to claim 1
In in step 2 and step 4, the standard for the end that discharges water is that 90% or more water decaying or flow discharges are less than 0.1m3/h。
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