CN109026133A - A kind of pumping method of the mined out absciss layer area gas pressure relief of overlength working face - Google Patents
A kind of pumping method of the mined out absciss layer area gas pressure relief of overlength working face Download PDFInfo
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- CN109026133A CN109026133A CN201811156383.6A CN201811156383A CN109026133A CN 109026133 A CN109026133 A CN 109026133A CN 201811156383 A CN201811156383 A CN 201811156383A CN 109026133 A CN109026133 A CN 109026133A
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- 238000005086 pumping Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000000605 extraction Methods 0.000 claims abstract description 203
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 claims abstract description 21
- 230000006872 improvement Effects 0.000 claims abstract description 10
- 238000005553 drilling Methods 0.000 claims description 47
- 238000010276 construction Methods 0.000 claims description 27
- 238000005065 mining Methods 0.000 claims description 25
- 238000007789 sealing Methods 0.000 claims description 23
- 239000002002 slurry Substances 0.000 claims description 15
- 239000004568 cement Substances 0.000 claims description 11
- 238000009423 ventilation Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 5
- 239000011435 rock Substances 0.000 claims description 5
- 239000011398 Portland cement Substances 0.000 claims description 4
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 4
- 238000005192 partition Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims 1
- 238000004880 explosion Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 8
- 239000000243 solution Substances 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000005802 health problem Effects 0.000 description 1
- 201000005630 leukorrhea Diseases 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 206010046901 vaginal discharge Diseases 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
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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
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- 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
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/006—Ventilation at the working face of galleries or tunnels
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses a kind of pumping methods of the mined out absciss layer area gas pressure relief of overlength working face, administer upper corner and goaf gas, the following steps are included: for overlength working face arrangement it is upper it is suitable, in genial lower suitable three back production lanes, formed above and below along air inlet, in suitable return air " W " type ventilating system；Along carrying out back production after middle and upper part location arrangements high position extraction borehole in the round section joint ring on overburden of the goaf top and high level drainage tunnel in described；The high-order drainage holes and high level drainage tunnel of the arrangement are connected on extraction branch pipe, then extraction branch pipe is incorporated to mine gas extraction and carries out extraction improvement using system.Pumping method of the present invention being capable of efficient methane drainage and utilization project goaf absciss layer release fissure zone high concentration gas, reduce the gas emission of work face goaf, preventing working face return air and gas at upper corner transfinites and goaf gas explosion accident, improve working surface production efficiency and safety, it is ensured that mine safety back production.
Description
Technical field
The invention belongs to goaf gas Treatment process field, specifically a kind of mined out absciss layer area release watt of overlength working face
This pumping method.
Background technique
Imperial beach mine is the newly-built modern mine in southwest, and in order to improve working face layout, realization is highly efficient and productive,
Working face arranges that thinking is adjusted to 200-240m by the Huaying hill mining area long 150m of usual inclination；It moves towards long 600m and is adjusted to 800-
1600m forms big reserves fully-mechanized mining working exploitation pattern.The adjustment of thinking is brought to mine stope gas control
Certain difficulty, especially goaf and gas at upper corner administer aspect, and safety in production hidden danger highlights, and main exposure has following
Some problems:
One, since working face inclination is long and moves towards long increase, in back production progradation thus goaf area can also increase
Greatly, when roof caving is with managing bad, big methane accumulation space is easily formed；
Two, mine south wing floor undulation splits gas and above covers the development of the coal seam K2, after back production under action of underground, adopts
High concentration floor crack gas and the coal seam a large amount of remnants K2 are easily connected in dead zone, increases goaf gas and gushes out source, gas gushes
Trial of strength is big out；
Three, fully-mechanized mining working takes U-typed to divulge information, and wind path is usually in unsmooth, the Yi Zao of turbulent state ventilation at upper corner
At methane accumulation.If goaf gas gush out administer it is not appropriate enough, gently if cause working face to stop production, and it is serious when can cause watt
This explosion accident.
Summary of the invention
The object of the present invention is to provide a kind of pumping method of the mined out absciss layer area gas pressure relief of overlength working face, the party
Method effective can solve the problems, such as that gas at upper corner transfinites and return gas exceeding limit, administer fully-mechanized mining working upper corner and mined out
Area's gas realizes goaf high concentration gas methane drainage and utilization project, improves the safety and production efficiency of fully-mechanized mining working.
For achieving the above object, the technical scheme adopted by the invention is that:
A kind of pumping method of the mined out absciss layer area gas pressure relief of overlength working face, this method includes:
(1) upper for overlength working face arrangement, neutralize lower three back production lanes of crossheading, formed above and below along air inlet, and in along returning
" W " type ventilating system of wind；
(2) the release crack belt position above the middle crossheading and in the round section joint ring arrange high-order extraction tunnel and
Extraction borehole carries out back production；
Wherein, goaf pressure relief gas pumping borehole and high-order extraction tunnel are administered trend along working face and are taken over using the stage
Formula arrangement, first stage are to face upward overlapping overlap joint obliquely to move towards the high-order extraction borehole extraction improvement stage, and a length of work is moved towards in improvement
Make face moves towards long 1/4, extraction borehole is arranged in working face in gate road top plate；Second stage is to be horizontally orientated to high bit length
Hole pumping and mining is administered the stage, and extraction borehole, which is arranged on, move towards in high position extraction tunnel positive moraine head, high-order extraction tunnel level away from
One distance of crossheading in return air, and hang down away from one distance of working face mining layer top plate, 2/4 that a length of working face moves towards long is moved towards in construction；
Phase III is to move towards high-order extraction tunnel extraction to administer the stage；
(3) sealing of hole is carried out to high-order extraction borehole, using " a two stifled notes " hole-sealing technology with pressure, the setting of drilling front and back is stifled
Head forms sealed grouting with pressure room, will carry out in the sealed grouting with pressure room of proportioned dilatancy cement slurry injection with pressure
Filling and blocking, the service channel in partition screen casing extraction area and country rock gas leakage crack in hole, high-order extraction borehole hole sealing depth be not small
In 30m；
(4) laying arrangement internal diameter of the pipeline is not less than in the middle crossheading of working face return air and high-order extraction tunnel
The extraction branch pipe of DN200mm, setting checks mouth and gate valve on extraction branch pipe, and by the high-order extraction borehole of arrangement and high-order extraction
Tunnel is connected on extraction branch pipe, then extraction branch pipe is incorporated to mine gas extraction system, carries out mined out absciss layer area pressure relief gas pumping
Adopt utilization；
(5) first stage high position extraction borehole is thrown after working face extraction promotes a distance and is taken out, and the high-order extraction is bored
Hole is connected into the extraction branch pipe of the middle crossheading laying and carries out methane drainage and utilization project；Second stage high position extraction borehole is in working face extraction
Be advanced into its 1/4 move towards long after throw and take out, the high-order extraction borehole is connected into the extraction branch pipe laid in high-order extraction tunnel
Carry out methane drainage and utilization project；Phase III high position extraction tunnel working face extraction be advanced into its 2/4 move towards long after throw and take out, taken out in a high position
Adopt the full exhaust ventilation in tunnel be nearby no more than at the position of 5m construct it is closed, and stay in high-order extraction tunnel set extraction branch pipe into
It takes out in row lane.
Preferably, in step (1), working face tilt length >=240m of the overlength working face；The middle crossheading
Return air amount is the upper and lower crossheading air inlet with the sum of air quantity；The upper and lower crossheading air inlet is 800~1000m with air quantity3/
Min, the return air amount of the middle crossheading are 1600~2000m3/min。
Preferably, in step (2), the extraction borehole of the first stage is arranged: drilling arranges that every group of quantity is not in groups
Less than 4 holes, every group of spacing 40m, drilling construction diameter are not less than 94mm, and 20 °~30 ° of drilling construction inclination angle, construct hole depth 60m
~70m, the bore position in whole hole is in crack belt position, apart from roof direction 20m~30m.
Preferably, in step (2), the extraction borehole of the second stage is arranged: at least arranging that 8 drillings, drilling are applied
1 ° of work inclination angle, bore dia are not less than 113mm, and hole depth is that working face moves towards long 1/4, and drilling layer position and high-order extraction tunnel are kept
Unanimously.
Preferably, in step (2), the high-order extraction roadway layout of the second stage: high-order extraction tunnel level away from
Crossheading 6m~10m in return air hangs down away from working face mining layer top plate 20m~30m.
Preferably, the extraction layer position of fissure zone described in step (2) is at 10~15 times of working face mining height layer position.
Preferably, in step (3), proportioned dilatancy cement slurry is injected into sealed grouting with pressure using hole-sealing pump
Indoor carry out filling and blocking with pressure；The hole-sealing pump is mechanical hole-sealing pump, is BFK-12/2.4 type Pump for sealed hole in mine, send slurry
The maximum of ability is hung down away from for 50m.
Preferably, in step (3), the cement slurry proportion, portland cement: water: land plaster weight ratio presses 2.5:
1:0.2 configuration.
Preferably, in step (4), the mine gas extraction system is the permanent methane drainage and utilization project system in ground, the system
Two water ring vacuum pumps are installed, maximum sucking rate is 324m3/ min, rated power 400kw, extraction system main line caliber are
DN500mm, exploiting field main pipe road caliber are DN350mm.
Preferably, in step (5), first stage high position extraction borehole is thrown after working face extraction promotes 30m and is taken out.
The beneficial effects of the present invention are: overlength working face is adjusted to " W " type ventage by pumping method provided by the invention
System, extraction work arrangement pumping and mining pressure relief mash gas in the double round section joint rings of mined out absciss layer, solves conventional operation face U-typed ventage
Unite poor lower goaf gas extracting result, upper corner and return air gas exceeding limit takes place frequently and the safety related technical problems such as security threat is big,
The gas emission that work face goaf can be reduced prevents working face return air and corner gas exceeding limit and goaf gas explosion
Accident improves working surface production efficiency and safety, it is ensured that mine safety back production.This method mainly has the following beneficial to effect
Fruit:
1. working face is divulged information using W type, upper and lower crossheading is air inlet, and Gas Accumulation in Upper-Corner by Pulsed is not present in ventilating system
Problem, so that fundamentally solving gas at upper corner transfinites；
2. drilling and extraction roadway layout in along in top overlying strata separation layer release fissure zone, since stope drift active workings use W
Type arrangement, therefore adopted in rear in working face and form double round section joint ring stacked tapes along the mined out upper lateral part of above rock, it increases and unloads
Press anti-reflection range, can preferable extraction high concentration goaf gas, to realize that goaf gas is administered in efficient extraction；This
Inventive method can extraction gas density up to 20~60% or more；
3. the gateway layout method of working face W type ventilation, is more advantageous to the arrangement that working face adopts the hole preceding coal seam Yu Chou,
Crossheading arrangement concordant pre-draining borehole in upper, middle and lower is beneficial to prevent the pre- evacuation leukorrhea phenomenon drilled and occurred during controlling calamity, for work
It realizes that pre-mining drainage is up to standard and creates condition in face；
Tailentry can be arranged and be independent air return lane by the gateway layout method of 4.W type ventilation, thus avoid
Fully mechanized mining related electric equipment is set in air return lane, also avoids return air dust from jeopardizing worker health problem, is conducive to working face
Ventilating gas management；
5. the arrangement that extraction engineering of the present invention uses height drainage drilling hole to combine with high level drainage tunnel, is saved on the whole
Most suction road controls calamity project amount, realizes safety economy benefit；
6. the method for the present invention simple process, there are apparent technical advantage and popularization and application foregrounds.
Detailed description of the invention
Fig. 1 is " W " type ventilating system, extraction borehole and the knot in extraction tunnel that 1 pumping method of the embodiment of the present invention is laid
Structure schematic diagram.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the technical solution below in the present invention carries out clear
Chu is fully described by, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
A kind of pumping method of the mined out absciss layer area gas pressure relief of overlength working face, this method includes:
(1) upper for overlength working face arrangement, neutralize lower three back production lanes of crossheading, formed above and below along air inlet, and in along returning
" W " type ventilating system of wind；
(2) high-order extraction tunnel and extraction are arranged in the release crack belt position above middle crossheading and in the round section joint ring
Drilling carries out back production；
Wherein, goaf pressure relief gas pumping borehole and high-order extraction tunnel are administered trend along working face and are taken over using the stage
Formula arrangement, first stage are to face upward overlapping overlap joint obliquely to move towards the high-order extraction borehole extraction improvement stage, and a length of work is moved towards in improvement
Make face moves towards long 1/4, extraction borehole is arranged in working face in gate road top plate；Second stage is to be horizontally orientated to high bit length
Hole pumping and mining is administered the stage, and extraction borehole, which is arranged on, move towards in high position extraction tunnel positive moraine head, high-order extraction tunnel level away from
One distance of crossheading in return air, and hang down away from one distance of working face mining layer top plate, 2/4 that a length of working face moves towards long is moved towards in construction；
Phase III is to move towards high-order extraction tunnel extraction to administer the stage；
(3) sealing of hole is carried out to high-order extraction borehole, using " a two stifled notes " hole-sealing technology with pressure, the setting of drilling front and back is stifled
Head forms sealed grouting with pressure room, will carry out in the sealed grouting with pressure room of proportioned dilatancy cement slurry injection with pressure
Filling and blocking, the service channel in partition screen casing extraction area and country rock gas leakage crack in hole, high-order extraction borehole hole sealing depth be not small
In 30m；
(4) laying arrangement internal diameter of the pipeline is not less than in the middle crossheading of working face return air and high-order extraction tunnel
The extraction branch pipe of DN200mm (DN, nominal diameter), setting checks mouth and gate valve on extraction branch pipe, and by the high-order extraction of arrangement
Drilling and high-order extraction tunnel are connected on extraction branch pipe, then extraction branch pipe is incorporated to mine gas extraction system, carry out it is mined out from
Floor area pressure relief gas pumping mining utilizes；
(5) first stage high position extraction borehole is thrown after working face extraction promotes a distance and is taken out, and high-order extraction borehole is connected
Enter in the extraction branch pipe of middle crossheading laying and carries out methane drainage and utilization project；Second stage high position extraction borehole is advanced into it in working face extraction
1/4 moves towards throwing pumping after length, and high-order extraction borehole is connected into the extraction branch pipe laid in high-order extraction tunnel and carries out methane drainage and utilization project；
Phase III high position extraction tunnel working face extraction be advanced into its 2/4 move towards long after throw and take out, in the high-order full negative pressure in extraction tunnel
Ventilation is closed no more than constructing at the position of 5m nearby, and stays in high-order extraction tunnel and set extraction branch pipe progress lane pumping.
Further, in step (1), working face tilt length >=240m of overlength working face；Working face matches air quantity root
It is calculated according to gas control needs, the return air amount of middle crossheading is upper and lower crossheading air inlet with the sum of air quantity；Upper and lower crossheading into
Wind is 800~1000m with air quantity3/ min, the return air amount of middle crossheading are 1600~2000m3/min。
Further, in step (2), the extraction borehole of first stage is arranged: drilling arranges that every group of quantity is many in groups
In 4 holes, every group of spacing 40m, drilling construction diameter be not less than 94mm, 20 °~30 ° of drilling construction inclination angle, construction hole depth 60m~
70m, the bore position in whole hole is in crack belt position, apart from roof direction 20m~30m.Drilling construction diameter limits 94mm
More than, aperture is bigger, and single hole extraction flow is bigger, and extraction regulation effect is better.Drilling construction inclination angle, depth, group away from set
It is fixed: to be to allow such drilling (to face upward overlapping overlap joint obliquely and move towards high-order extraction borehole) construction to extraction high concentration on the one hand
The release crack belt position of goaf gas；On the other hand, as the continuous back production of working face promotes, such borehole fissure zone is taken out
Adopting range will gradually tail off, and since such drilling is to be spaced to arrange in groups at a certain distance, become in upper one group of hole pumping and mining effect
While poor, next group of drilling is connected at crack belt position extraction immediately, it is ensured that regulation effect.
Further, in step (2), the extraction borehole of second stage is arranged: at least arranging 8 drillings, drilling construction
1 ° of inclination angle, bore dia are not less than 113mm, and hole depth is that working face moves towards long 1/4, and drilling layer position and high-order extraction tunnel keep one
It causes.The high-power drilling machine construction of ZDY4000S or ZDY6000S type can be used to drill, high-power drilling machine is capable of providing work effect
Rate.Second stage is horizontally orientated to high-order long drilled holes, and drilling construction inclination angle requires horizontal keep with suction road construction layer position one to inclining
1 ° or so of angle.Because suction road is arranged on crack belt position, drills along moraine head divergence, remain at this and split
Gap belt position will lead to drilling and deflect away from crack belt position influence extraction regulation effect if inclination angle construction is excessive.Drilling construction depth
(i.e. hole depth) the longer the better, and the time that the longer stage extraction is administered is longer, and the work process variable of suction road can optimize reduction,
Mean level, which moves towards high-order long drilled holes construction depth, should be not less than 200m.
Further, in step (2), the high-order extraction roadway layout of second stage: high-order extraction tunnel level away from return
Crossheading 6m~10m in wind hangs down away from working face mining layer top plate 20m~30m.The selection that a high position takes out lane arrangement layer position, which directly affects, adopts
The quality of dead zone gas drainage under suction effect, general high position extraction tunnel need to be arranged in crack belt position.
Further, in step (2) the extraction layer position of fissure zone at 10~15 times of working face mining height layer position.A high position is taken out
It, being capable of preferable extraction improvement goaf gas after adopting tunnel and extraction borehole construction to this layer of position.
Further, in step (3), proportioned dilatancy cement slurry is injected into sealed band pressure injection using hole-sealing pump
Starch indoor carry out filling and blocking with pressure；Hole-sealing pump is mechanical hole-sealing pump, is BFK-12/2.4 type Pump for sealed hole in mine, send slurry ability
Maximum hang down away from for 50m.
Further, in step (3), cement slurry proportion, portland cement: water: land plaster weight ratio presses 2.5:1:0.2
Configuration.
Further, in step (4), mine gas extraction system is the permanent methane drainage and utilization project system in ground, system peace
Two water ring vacuum pumps are filled, maximum sucking rate is 324m3/ min, rated power 400kw, extraction system main line caliber are
DN500mm, exploiting field main pipe road caliber are DN350mm.
Further, in step (5), first stage high position extraction borehole is thrown after working face extraction promotes 30m and is taken out.
In order to more specifically describe a kind of extraction of the mined out absciss layer area gas pressure relief of overlength working face provided by the invention
Method is described in detail below in conjunction with drawings and examples 1.
Embodiment 1
For big reserves overlength fully-mechanized mining working upper corner and goaf gas resolution, adjustment working face extraction is proposed
Gateway layout method is adjusted to the ventilation of W type by traditional U-shaped ventilation, by being arranged in mined out absciss layer release gas drainage
Extraction borehole and extraction tunnel, carry out goaf gas methane drainage and utilization project, realize and face upper corner angle and goaf gas are pacified
Entirely, green, the purpose efficiently administered.
As shown in Figure 1, " W " type ventilating system, extraction borehole and the extraction lane laid for 1 pumping method of the embodiment of the present invention
Road structural schematic diagram (in figure 10 be goaf, 20 be compacting zone), in order to ensure regulation effect, include: in specific implementation
S1: arranging for overlength working face and go up (3) three crossheading (1), middle crossheading (2) and lower crossheading back production lanes, in formation,
It is lower along air inlet, in along return air " W " type ventilating system, wherein upper and lower along matching air quantity 1000m respectively3/ min, in along return air amount
2000m3/min；
S2: high-order extraction tunnel (4) and extraction borehole (5) are arranged before back production in advance above middle crossheading (2), and to be ensured
The layer position of arrangement is the release fissure zone middle and upper part in round section joint ring, to carry out back production；
Wherein, goaf pressure relief gas pumping borehole and high-order extraction tunnel (4) administer trend along working face and use the stage
Formula arrangement is taken over, the first stage is to face upward overlapping overlap joint obliquely to move towards the high-order extraction borehole extraction improvement stage, and length is moved towards in improvement
It is the 1/4 of working face trend, extraction borehole (5) is arranged in crossheading in working face (2) back, and drilling is arranged in groups,
Every group of quantity is no less than 4 holes, every group of spacing 40m, and drilling construction diameter is not less than 94mm, 20 °~30 ° of drilling construction inclination angle,
Construct hole depth 60m~70m, and the whole hole that drills is in crack belt position, apart from roof normal distance 20m~30m；Second stage is
It is horizontally orientated to high-order long drilled holes extraction to administer the stage, extraction borehole (5), which is arranged on, moves towards the positive moraine head of high-order extraction tunnel (4)
It is interior, using the high-power drilling machine construction of ZDY4000S or ZDY6000S type, at least arrange 8 drillings, 1 ° of drilling construction inclination angle, Kong Zhi
Diameter is not less than 113mm, and hole depth is that working face moves towards long 1/4, and drilling layer position is consistent with high-order extraction tunnel (4)；It is high-order
Extraction tunnel (4) is horizontal away from crossheading in return air (2) high side 6m~10m, hangs down away from working face mining layer top plate 20m~30m, construction is walked
Long 2/4 is moved towards to a length of working face；Phase III is to move towards the extraction of supratidal pond lane to administer the stage, is controlled into the stage extraction
It needs to be no more than at the position 5m near the full exhaust ventilation of high-order extraction tunnel (4) in advance after reason and constructs closed, and stay and set drainage tube
Road carry out lane pumping；
S3: high-order extraction borehole hole sealing technology requirement:
(1) using " a two stifled notes " hole-sealing technology with pressure, drilling front and back is arranged plug, forms sealed grouting with pressure room,
Proportioned dilatancy cement slurry is injected in sealed grouting with pressure room using mechanical hole-sealing pump and carries out filling and blocking with pressure, every
The service channel of country rock gas leakage crack in disconnected screen casing extraction area and hole；
(2) hole-sealing pump selects BFK-12/2.4 type Pump for sealed hole in mine, and the maximum of slurry ability is sent to hang down away from for 50m；
Cement slurry proportion, portland cement: water: land plaster weight ratio is configured by 2.5:1:0.2；
(3) high-order extraction borehole hole sealing depth is not less than 30m；
S4: laying arrangement internal diameter of the pipeline is not less than DN200mm in suitable and high-order extraction tunnel (4) in working face return air
PVC extraction branch pipe, setting checks mouth and gate valve on extraction branch pipe, and by the high-order extraction borehole of arrangement and high-order extraction tunnel
(4) it is connected on extraction branch pipe, then extraction branch pipe is incorporated to mine gas extraction system and carries out mined out absciss layer area pressure relief gas pumping mining
It utilizes；
S5: it is after working face extraction promotes 30m that the throwing of first stage high position extraction borehole, which is found time, and drilling is connected into middle crossheading
(2) methane drainage and utilization project is carried out in the extraction branch pipe laid；It is when working face extraction pushes away that the throwing of second stage high position extraction borehole, which is found time,
Proceed to 1/4 move towards long after, drilling, which is connected into the extraction branch pipe (6) laid in high-order extraction tunnel (4), carries out methane drainage and utilization project；Third
It is after working face extraction is advanced into 2/4 and moves towards long that stage high position extraction tunnel (4), which throws and finds time, and high-order extraction tunnel (4) is entirely
Exhaust ventilation, which is nearby no more than at the position 5m, to be constructed envelope wall (7), is stayed in lane and is set extraction branch pipe progress lane pumping.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. a kind of pumping method of the mined out absciss layer area gas pressure relief of overlength working face, which is characterized in that this method includes:
(1) upper for overlength working face arrangement, neutralize lower three back production lanes of crossheading, formed above and below along air inlet, and in along return air
" W " type ventilating system；
(2) high-order extraction tunnel and extraction are arranged in the release crack belt position above the middle crossheading and in the round section joint ring
Drilling carries out back production；
Wherein, goaf pressure relief gas pumping borehole and high-order extraction tunnel administer trend along working face and take over formula cloth using the stage
It sets, the first stage is to face upward overlapping overlap joint obliquely to move towards the high-order extraction borehole extraction improvement stage, and a length of working face is moved towards in improvement
Long 1/4 is moved towards, extraction borehole is arranged in working face in gate road top plate；Second stage is to be horizontally orientated to high-order long drilled holes
Extraction is administered the stage, and extraction borehole, which is arranged on, to be moved towards in the positive moraine head in high-order extraction tunnel, and high-order extraction tunnel level is away from return air
Middle one distance of crossheading, and hang down away from one distance of working face mining layer top plate, 2/4 that a length of working face moves towards long is moved towards in construction；Third
Stage is to move towards high-order extraction tunnel extraction to administer the stage；
(3) sealing of hole is carried out to high-order extraction borehole, using " a two stifled notes " hole-sealing technology with pressure, plug, shape is arranged in drilling front and back
At sealed grouting with pressure room, proportioned dilatancy cement slurry is injected in sealed grouting with pressure room and carries out filling envelope with pressure
Stifled, the service channel of country rock gas leakage crack in partition screen casing extraction area and hole, high-order extraction borehole hole sealing depth is not less than 30m；
(4) laying arrangement internal diameter of the pipeline is not less than DN200mm's in the middle crossheading of working face return air and high-order extraction tunnel
Extraction branch pipe, setting checks mouth and gate valve on extraction branch pipe, and the high-order extraction borehole of arrangement and high-order extraction tunnel are connected into
On extraction branch pipe, then extraction branch pipe is incorporated to mine gas extraction system, carries out the utilization of mined out absciss layer area pressure relief gas pumping mining；
(5) first stage high position extraction borehole is thrown after working face extraction promotes a distance and is taken out, and the high-order extraction borehole is connected
Enter in the extraction branch pipe of the middle crossheading laying and carries out methane drainage and utilization project；Second stage high position extraction borehole is promoted in working face extraction
To its 1/4 move towards long after throw and take out, the high-order extraction borehole is connected into the extraction branch pipe laid in high-order extraction tunnel and is carried out
Methane drainage and utilization project；Phase III high position extraction tunnel working face extraction be advanced into its 2/4 move towards long after throw and take out, in high-order extraction lane
The full exhaust ventilation in road, which is nearby no more than at the position of 5m, to be constructed closed, and is stayed in high-order extraction tunnel and to be set extraction branch pipe and carry out lane
It takes out.
2. the pumping method of the mined out absciss layer area gas pressure relief of overlength working face according to claim 1, which is characterized in that
In step (1), working face tilt length >=240m of the overlength working face；The return air amount of the middle crossheading is described upper and lower
Crossheading air inlet matches the sum of air quantity；The upper and lower crossheading air inlet is 800~1000m with air quantity3/ min, the middle crossheading
Return air amount is 1600~2000m3/min。
3. the pumping method of the mined out absciss layer area gas pressure relief of overlength working face according to claim 1, which is characterized in that
In step (2), the extraction borehole of the first stage is arranged: drilling arranges in groups, and every group of quantity is no less than 4 holes, between every group
Away from 40m, drilling construction diameter is not less than 94mm, and 20 °~30 ° of drilling construction inclination angle, construct hole depth 60m~70m, the drilling in whole hole
Position is in crack belt position, apart from roof direction 20m~30m.
4. the pumping method of the mined out absciss layer area gas pressure relief of overlength working face according to claim 1, which is characterized in that
In step (2), the extraction borehole of the second stage is arranged: at least arranging 8 drillings, 1 ° of drilling construction inclination angle, bore dia are not
Less than 113mm, hole depth is that working face moves towards long 1/4, and drilling layer position is consistent with high-order extraction tunnel.
5. the pumping method of the mined out absciss layer area gas pressure relief of overlength working face according to claim 1, which is characterized in that
In step (2), the high-order extraction roadway layout of the second stage: high-order extraction tunnel level away from crossheading 6m~10m in return air,
It hangs down away from working face mining layer top plate 20m~30m.
6. the pumping method of the mined out absciss layer area gas pressure relief of overlength working face according to claim 1, which is characterized in that step
Suddenly the extraction layer position of fissure zone described in (2) is at 10~15 times of working face mining height layer position.
7. the pumping method of the mined out absciss layer area gas pressure relief of overlength working face according to claim 1, which is characterized in that
In step (3), proportioned dilatancy cement slurry is injected in sealed grouting with pressure room using hole-sealing pump and carries out filling with pressure
It blocks；The hole-sealing pump is mechanical hole-sealing pump, is BFK-12/2.4 type Pump for sealed hole in mine, send the maximum of slurry ability hang down away from for
50m。
8. the pumping method of the mined out absciss layer area gas pressure relief of overlength working face according to claim 1, which is characterized in that
In step (3), the cement slurry proportion, portland cement: water: land plaster weight ratio is configured by 2.5:1:0.2.
9. the pumping method of the mined out absciss layer area gas pressure relief of overlength working face according to claim 1, which is characterized in that
In step (4), the mine gas extraction system is the permanent methane drainage and utilization project system in ground, which installs two Water-ring vacuums
Pump, maximum sucking rate are 324m3/ min, rated power 400kw, extraction system main line caliber are DN500mm, exploiting field main pipe
Road caliber is DN350mm.
10. the pumping method of the mined out absciss layer area gas pressure relief of overlength working face according to claim 1, which is characterized in that
In step (5), first stage high position extraction borehole is thrown after working face extraction promotes 30m and is taken out.
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