CN108661643A - It a kind of coal working face end adopts return channel and cuts top release shield lane method - Google Patents
It a kind of coal working face end adopts return channel and cuts top release shield lane method Download PDFInfo
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- CN108661643A CN108661643A CN201810378936.6A CN201810378936A CN108661643A CN 108661643 A CN108661643 A CN 108661643A CN 201810378936 A CN201810378936 A CN 201810378936A CN 108661643 A CN108661643 A CN 108661643A
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- 239000002360 explosive Substances 0.000 claims description 30
- 238000004519 manufacturing process Methods 0.000 claims description 22
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- 239000000843 powder Substances 0.000 claims description 19
- 238000005422 blasting Methods 0.000 claims description 14
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- 239000003814 drug Substances 0.000 claims description 7
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- 229920003023 plastic Polymers 0.000 claims description 7
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- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 3
- 229920001342 Bakelite® Polymers 0.000 claims description 3
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- 238000009434 installation Methods 0.000 claims description 3
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- 235000020004 porter Nutrition 0.000 claims description 3
- 230000037452 priming Effects 0.000 claims description 3
- XTFIVUDBNACUBN-UHFFFAOYSA-N 1,3,5-trinitro-1,3,5-triazinane Chemical compound [O-][N+](=O)N1CN([N+]([O-])=O)CN([N+]([O-])=O)C1 XTFIVUDBNACUBN-UHFFFAOYSA-N 0.000 claims description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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Classifications
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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
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Geology (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
It a kind of coal working face end adopts return channel and cuts top release shield lane method, belong to the voltage-controlled system of mining engineering mine and roadway maintenance technical field, it can solve the problems, such as that work on hand face stops adopting protection coal pillar size between line and exploiting field main entry and causes exploiting field recovery ratio low greatly, the present invention is a kind of propagation path for adopting advanced support pressure by deep hole presplitting roof cut-out working face, and it provides and a kind of shifting to an earlier date digging work face support unit return channel along the position of terminal mining line and deep hole presplitting roof cut-out working face adopts the propagation path of advanced support pressure, exploiting field main entry is protected not by both sides stope mining influence and reduces working face and stops adopting the width of protection coal pillar between line and exploiting field main entry method to improve exploiting field recovery ratio.The present invention improves the exploiting field recovery ratio of non-renewable coal resources under the premise of ensureing exploiting field main entry safety and stability.
Description
Technical field
The invention belongs to the voltage-controlled systems of mining engineering mine and roadway maintenance technical field, and in particular to a kind of along stopping adopting line position
It sets digging support unit return channel in advance and deep hole presplitting roof cut-out working face adopts the propagation of advanced support pressure
Path protects exploiting field main entry not stopped adopting protection coal pillar between line and exploiting field main entry by both sides stope mining influence and diminution
Method to improve exploiting field recovery ratio.
Background technology
Coal is the basic energy resource for ensureing Chinese national economy fast development, to meet the market demand, coal in China production
The production scale of enterprise is increasing.Under current production specifications, China Jing Gongkuangjing mostly uses exploiting field formula production system
System.Exploiting field is the exploitation block with independent transport and ventilating system in field with "nine squares", moves towards medium position arrangement exploiting field in exploiting field and transports
On defeated（Under）On mountain, exploiting field track（Under）Mountain is each responsible for transport and the ventilation task of entire exploiting field getting working face, referred to as adopts
Area's main entry.Exploiting field main entry runs through entire exploiting field, is typically located at exploiting field and moves towards middle position, is respectively arranged in exploiting field main entry both sides
Coal wall and form double-vane exploiting field.Exploiting field main entry service year limit for length, once buckling deformation destroys seriously, it will it influences whole
The production in a exploiting field, it requires exploiting field main entry supporting in order and country rock keeps stablizing.Exploiting field main entry is located at exploiting field trend
Medium position, by the mining influence of both sides stope, maintenance situation is in addition to the natural cause by tunnel present position
Outside influencing, the mining influence of both sides stope is depended primarily on.
In order to ensure the safety of exploiting field main entry, exploiting field main entry both sides stope, which generally all stays, sets the larger guarantor of width
It protects coal column and determines the position of terminal mining line, some protection coal pillar width are even more than 100m.Stay that set big width protection coal pillar not only unrestrained
The non-renewable coal resources for taking a large amount of preciousnesses, reduce exploiting field recovery ratio, do not meet current China's High output and high profits mine well construction and want
It asks；And goaf residual coal is more, and there are spontaneous combustion in goaf ignition hidden danger, threaten the long term growth of entire mine.
Working face, which stops adopting, stays the protection coal pillar for setting larger width decrease both sides working face to adopt exploiting field main entry between line and exploiting field main entry
The dynamic contradiction for influencing and building high-yield and high-efficiency modern mine, improve between the recovery ratio of exploiting field is that China Jing Gongkuangjing faces at present
One of principal contradiction.
" optimizing using hydraulic fracturing release and stop adopting for Publication No. CN106321049 A can be obtained in open source literature
The method of the method and device of line position " patent, optimization the position of terminal mining line is default more along mining roadway length direction interval
A hydraulic fracturing pressure relief vent being sequentially arranged carries out hydraulic fracturing release, forms cutting crack and reduces ahead work face branch bulging
Influence of the power to mining roadway.At least there is two disadvantages or shortcoming in this method, one is not clear hydraulic fracturing
The opportunity of release may impact the production works such as the normal back production of working face；The second is comprising many natural in rock mass
Defect, such as hole, microcrack etc., since the permeability of water is very strong, under high-pressure hydraulic effect, these natural voids, crack
Conduit pipe will be become, make high pressure water seepage flow and reduce pressure, the dynamics requirement needed for fracturing rock mass is not achieved.Hydrofracturing
By Pipeline transport pressure up to the high pressure water of 50 ~ 60MPa, therefore, there may be the danger broken through for line connection, and once
Line connection is broken through, and the high pressure water destructive power that pressure reaches 50 ~ 60MPa is very big, equipment that can be to surrounding and constructor
Member causes centainly to injure, and there are prodigious security risks.
In order to weaken the mining influence that both sides actual mining faces exploiting field main entry, diminution stops adopting between line and exploiting field main entry
Protection coal pillar size, under the premise of ensureing exploiting field main entry safety and stability, to improve the exploiting field extraction of non-renewable coal resources
Rate, there is an urgent need to seek, one kind digging support unit return channel in advance along the position of terminal mining line and deep hole presplitting roof is cut
Disconnected working face adopts the propagation path of advanced support pressure, protects exploiting field main entry not by both sides stope mining influence and contracting
Small working face stops adopting the width of protection coal pillar between line and exploiting field main entry the method to improve exploiting field recovery ratio.
Invention content
The present invention stops adopting protection coal pillar size between line and exploiting field main entry for work on hand face causes exploiting field to produce greatly
The low problem of rate provides a kind of coal working face end and adopts return channel and cuts top release shield lane method, and the present invention is that one kind passing through depth
Hole presplitting roof cut-out working face adopts the propagation path of advanced support pressure, and provides one kind and carried along the position of terminal mining line
Preceding digging work face support unit return channel and deep hole presplitting roof cut-out working face adopt the biography of advanced support pressure
Path is broadcast, exploiting field main entry is protected not stopped adopting between line and exploiting field main entry by both sides stope mining influence and diminution working face
Method of the width of protection coal pillar to improve exploiting field recovery ratio.
The present invention adopts the following technical scheme that：
A kind of coal working face end adopts return channel and cuts top release shield lane method, includes the following steps：
The first step calculates the periodic weighting step pitch L for determining that stope pushes up always,, in formula, L is exploiting field
The periodic weighting step pitch that main entry both sides stope pushes up always；h 2For the thickness of coal seam main roof strata；qIt is overlying rock by gravity
The uniform load for acting on and being applied on the main roof strata of coal seam；RTFor the ultimate tensile strength of main roof strata；
Second step, apart from the position of exploiting field main entry S=2L, at the end of determining working face extraction, the position of mining device return channel
It sets, i.e., protection coal pillar width S=2L between working face the position of terminal mining line and exploiting field main entry；
Third walks, after installation is complete for the mining devices such as working face extraction tunnelling and open-off cut holder, in determining work
Face the position of terminal mining line digs a force piece along seat earth according to the direction parallel with exploiting field main entry and other back production are set
Standby return channel, return channel width are 2m, and return channel height is the minimum bearing height of working surface hydraulic support, is withdrawn
Using anchor metal or anchor cable and metal mesh combined supporting, return channel is close to return for channel top plate and the lateral wall of close exploiting field main entry
The lateral wall of mining face uses cleavable glass fibre reinforced plastics rockbolts and flame retardant plastics net combined supporting；
4th step sets depth since return channel one end is apart from the end positions 10m in return channel inner top panel centre position
Hole pre-splitting hole, all drillings are biased to return channel and start to punch 45 ° of end, i.e., the angle between drilling and vertical direction is 45 °；It bores
Bore dia Φ=75mm；Drilling depth H=（h 1+h 2）÷ sin45 °,h 1For the thickness that back production coal seam is directly pushed up,h 2For back production coal seam
The thickness pushed up always；Spacing distance between adjacent drillingl=5m, when the last one drilling the return channel other end between away from
When from less than 10m, stopping set drilling, all drillings set move towards in alignment along return channel, according to set priority
Sequence is numbered to the drilling set successively according to since 1；
5th step, after the completion of all drillings are all set, the watering and lowering dust in return channel prepares to start to load into drilling fried
Medicine loads explosive, as blast hole in the drilling that number is odd number；Explosive is not loaded in the drilling that number is even number, is made
The scope of freedom is provided for pilot hole, guiding roof strata moves towards cracking, i.e. deep hole blasting shape in roof strata along return channel
At precracking it is parallel with exploiting field main entry；
6th step loads explosive into blast hole using Uncoincided charge mode, is ignited using double detonator, double primacords, 2 thunders
Pipe is connected outside blast hole using parallel way, and every 3 blast holes are one group and using being connected in series with, if blast hole is less than 3
When be individually for one group, it is good to blow out bus insulation, hanging to hang；
7th step, using tamper by the explosive needed for each blast hole by volume load hole and shifting bottom hole onto, explosive payload it is small can
To be once packed into, loaded length is the drillable length that range is pushed up in coal seam always, i.e. loaded length is（h 2÷sin45°）；
Before filling first volume priming, first two primacords to be filled in powder stick in advance, the length that primacord stretches into powder stick is 200mm,
Blend compounds band, which twines, is made primer [cartridge], then this powder stick is sent to blast hole bottom hole with tamper；Then gradually it is packed into remaining medicine
Ready sealing of hole stemming is packed into blast hole and vibration compacting, envelope by volume after loaded length reaches design requirement, then with tamper
Primacord must not be damaged during stem；
8th step, all blast hole powder charge sealing of hole work are completed, by the sole duty person's of blowing out on line, after connection is good, busbar and foot
Line is hanging, prevents from being grounded；
9th step, is blown out using initiator, by group blasting in groups.Using " local parallel, overall to connect " between every group of blast hole
Mode on line, one group of charging hole of detonating every time, detonates successively from small to large by charging hole sequence；
Tenth step, all powder charge drillhole blastings finish, and wait for that blasting fume dispels, and check after confirming without misfire condition, in return channel two
End construction fire dam closes return channel；
11st step when working face extraction is advanced into return channel position, stops back production, removes the closed of return channel both ends
Wall withdraws from working surface hydraulic support and other mining devices from return channel.
The deep hole presplitting drilling is set by existing mining drilling equipment by design position and parameter, and drilling diameter is
75mm。
The explosive is three-grade coal mine allowable emulsified explosive, and powder stick dimensions is 60 × 500mm of Φ, and weight specification is
1.5 kg/ volumes.
The detonator is allowed for use in coal mines 8# instant electric detonators, can cause detonation after energization immediately.
The primacord is coal permissible detonating cord, and ether peace, hexogen explosive are medicine core, with cotton thread and plastic knitting silk
It etc. making wrap, is formed by damp-proof layer of plastics, specification is 6.5 ± 0.3mm of Φ, explosion velocity >=6000m/s.
The tamper is the socket bakelite tamper of Φ 30 mm × 2000 mm, is connected by steel bushing between adjacent tamper；Big gun
Rod front end processes the wooden tamper head of Φ 50 mm × 500 mm, increases the contact area of tamper and explosive cartridge and stemming；
The finer wire or nylon rope of an a diameter of 3mm are fixed on the wooden tamper head of tamper front end, for powder charge, during sealing of hole from
Towed artillery club head, prevents tamper from falling off in socket place when exiting tamper in drilling.
The sealing of hole stemming is the cylindric strip stemming made by mining Stemming machine sand and loess, and closure has filled
The blast hole of explosive is filled in, stemming dimensions is Φ 60mm × 200m, and stemming is homogeneous, neither too hard, nor too soft, and surface is smooth, is used
Stemming is sent into the blast hole and vibration compacting for having filled explosive by tamper, prevents from generating open fire in blasting process.
The sealing of hole process of the blast hole carries out at twice, and first sealing of hole is at away from aperture 1m for the first time；When second of sealing of hole,
Dead band sealing of hole again will be filled in hole after detonator, primacord binding securely, until blast hole all full tampings of envelope.
The initiator is allowed for use in coal mines initiator, for causing electric cap in coal mine underground explosion, be suitable for gas and
The Minepit environment of coal dust explosion hazard.
The fire dam of the return channel two ends is the temporary airtight wall of masonry bond, and wall surrounding slotting is shown in that hard side is hard
Bottom, the wall perps built by laying bricks or stones are staggered, and transverse joint is horizontal, and marshalling, mortar is full, metope fine ash mortar-chalked joint or completely smear.
Beneficial effects of the present invention are as follows：
The technical solution that aforementioned present invention is provided along the position of terminal mining line by shifting to an earlier date digging work face holder and other back production
Equipment returning channel and deep hole presplitting roof cut-out working face adopt the propagation path of advanced support pressure, reduce both sides
Actual mining faces the mining influence of exploiting field main entry, reduces the protection coal pillar size stopped adopting between line and exploiting field main entry, is protecting
Under the premise of demonstrate,proving exploiting field main entry safety and stability, the exploiting field recovery ratio of non-renewable coal resources is improved.
Compared with prior art, the present invention is according to the structure of back production Seam Roof And Floor rock stratum and the physical mechanics property of each rock stratum
Matter calculates the periodic weighting step pitch for determining that stope pushes up always, and is walked with the periodic weighting that twice of stope coal seam is pushed up always
Away from as exploiting field main entry and stopping adopting the protection coal pillar width dimensions between line, reduce Yin Liu set protection coal pillar and lose can not
Regenerated coal resource improves exploiting field coal resources recovery ratio, reduces Residual coal in goaf amount.By stopping adopting line position in determining
Digging work face holder in advance and the return channel of other equipment are set, blast hole and pilot hole are arranged in return channel top plate, and
Explosive presplitting roof is loaded in blast hole, formed in return channel roof strata one it is parallel with exploiting field main entry pre-
Crack, propagation path of the cut-out stope advanced support pressure in roof strata, reduces both sides actual mining and faces
The mining influence of exploiting field main entry is, it can be achieved that in the safety for staying the in the case of of setting smaller width protection coal pillar to realize exploiting field main entry country rock
Stablize.
Description of the drawings
Fig. 1 is exploiting field main entry of the present invention and both sides stope plane of arrangement schematic diagram；
Fig. 2 is that the present invention stops adopting return channel internal drilling arrangement schematic diagram at line；
Fig. 3 is tamper of the present invention and is mutually socketed schematic diagram；
Fig. 4 is primer [cartridge] and primacord connection diagram of the present invention；
Fig. 5 is filling explosive and sealing of hole schematic diagram in blast hole of the present invention；
Fig. 6 is fully mechanized coal face return channel internal drilling plane of arrangement schematic diagram of the embodiment of the present invention.
Wherein：In the transport of the exploiting fields 1-（Under）Mountain；On the track of the exploiting fields 2-（Under）Mountain；3- stopes；The goafs 4-；5- is left
Stop adopting line in side；Stop adopting line on the right side of 6-；7- return channels I；8- return channels II；9- is directly pushed up in coal seam；The coal seams 10- Lao Ding；11- is bored
Hole；The wooden tamper heads of 12-；13- steel wire ropes；14- connection steel bushings；15- bakelite tampers；16- primacords I；17- primer [cartridge]s；18-
Primacord II；19- explosive cartridges；20- sealing of hole stemmings；21- detonators；22- payment to a porter；23- fully mechanized coal faces；The return aircourses 24-；25 into
Air way road.
Specific implementation mode
In conjunction with the embodiments, the present invention is further described.
Certain ore mining exploiting field formula arrangement moves towards coal wall, and mining technique back production average thickness is 5.2m's
The coal seams 15#, 4 ° of seam inclination average out to move towards middle position in exploiting field and arrange an exploiting field haulage drift and an exploiting field time
Air way road is each responsible for transport and the ventilation task of exploiting field both sides getting working face.
The previous fully mechanized coal face periodic caving average out to 13m in the exploiting field, stops adopting between line and exploiting field main entry
Protection coal pillar width is 80m, but exploiting field main entry is still serious by both sides working face mining influence, and working face extraction is close to stop adopting line
When neighbouring, there is serious deformation in exploiting field main entry road, and specific manifestation form is roof delamination, part collapse and large range of
Roof fall seriously threatens the safety and stability of the exploiting field main entry.
The exploiting field side fully mechanized coal face tendency length is 190m, and working face strike length is 860m.It is bored according to geology
Hole data shows that the Sandy Silt or mud stone for 4.2m thickness are directly pushed up in the coal seams 15#, and old top is the K of 5.6m thickness2Limestone calculates true
The fixed periodic weighting step pitch L=16m pushed up always.Using technical solution provided by the invention, the fully mechanized coal face the position of terminal mining line is determined
Protection coal pillar size S=2L=2 × 16=32m between the main entry of exploiting field.
After installation is complete for the mining devices such as Mining Roadway in Full-mechanized Caving Mining Face driving and open-off cut holder, apart from exploiting field
The position of main entry 32m digs the support unit return channel parallel with exploiting field main entry along seat earth, and return channel width is 2m,
The minimum altitude 3.2m of a height of working surface hydraulic support is inclined to long 190m along working face.Return channel top plate and close exploiting field are big
The lateral wall in lane selects the high-strength deformed steel bar anchor pole and diamond-type metal of Φ 22mm × 2400mm according to array pitch 900mm × 900mm
Net carries out supporting, and it is to be compiled by No. 10 iron wires that every anchor pole, which uses each one of K2335 and Z2360 resin explosive roll Anchor Agents, metal mesh,
The mesh size knitted is the diamond mesh of 50 × 50mm；Return channel close to stope lateral wall according to an array pitch
The mining flame-retardant plastics that 900mm × 900mm selects the glass fibre reinforced plastics rockbolts of Φ 22mm × 2000mm and specifications and models are PP180MS
Net carries out supporting.
When return channel driving supporting completion, in the return channel inner top panel away from fully mechanized coal face return aircourse 10m
Centre position starts to set drilling, and the fully mechanized coal face return aircourse 45° angle, bore diameter 75mm, drilling depth H are inclined in drilling
=（h 1+h 2）÷sin45°=（4.2+5.6）÷ sin45 °=13.86m, the spacing distance between adjacent drilling is 5m, logical when withdrawing
When the distance between the last one drilling and the fully mechanized coal face intake are 10m in road, stopping sets drilling.It is logical withdrawing
35 drillings are set in road altogether, number is followed successively by 1#, 2#, 3# ..., 34#, 35#.
After the completion of all drillings are all set, the watering and lowering dust in return channel prepares to start to load explosive into drilling.
In the drilling that number is odd number（1#, 3# ... ..., 35#）Interior filling explosive, as blast hole, totally 18 are loaded explosive blasting hole；
In the drilling that number is even number（2#, 4# ..., 34#）Explosive is not loaded inside, provides the scope of freedom as pilot hole, totally 17 do not fill
Fill out explosive drilling.
Each the loaded length of blast hole is（h 2÷sin45°）=5.6 ÷ sin45 °=7.92m, design filling 16 section rulers cun
The three-grade coal mine allowable emulsified explosive that specification is 60 × 500mm of Φ is rolled up.Before filling first volume priming, first two primacords are filled in advance
Enter in powder stick, the length that primacord stretches into powder stick is 200mm, and blend compounds band, which twines, is made primer [cartridge], then with tamper by this medicine
Volume is sent to blast hole bottom hole；Then it is gradually packed into remaining 15 section powder stick, after 16 section powder sticks are fitted into drilling, then uses big gun
Ready sealing of hole stemming is packed into blast hole with rod and vibration compacting is to away from the aperture positions 1m, 2 detonators is led with 2 respectively quick-fried
Dead band in hole is filled in after rope connection binding securely and uses stemming sealing of hole again, until blast hole all full tampings of envelope.
All totally 18 blast hole powder charge sealing of holes work are completed, by the sole duty person's of blowing out on line, after connection is good, busbar with
Payment to a porter is hanging, and it is one group of blasting in groups to press 3 blast holes using initiator.All powder charge drillhole blastings finish, and wait for that blasting fume dispels,
It checks and confirms no misfire condition, construction fire dam closes return channel at return channel both ends.
During working face extraction promotes until reaching return channel position, in exploiting field, main entry setting lane surface displacement is seen
Survey station, observational record exploiting field main entry roof and floor and two displacements helped.Observational record result surface, in the fully mechanized coal face back production
Start to back production to be advanced in 8 months of the position of terminal mining line, exploiting field main entry roof and floor and two displacements helped are both less than
There is not the phenomenon that part collapse or roof fall in 2mm, remains stable almost without the mining influence by the working face
State.
The fully mechanized coal face adopts return channel using a kind of coal working face end of the present invention and cuts top release shield lane method offer
Specific technical solution determine that it is 32m to stop adopting protection coal pillar between line and exploiting field main entry, and branch is dug in the position of terminal mining line in advance
Deep presplit blasting is simultaneously implemented in frame and other equipment returning channels, compared with staying originally and setting 80m protection coal pillars, not only more back production
48m coal resources（Practical more about 47400 tons of raw coal of back production）, improve exploiting field recovery ratio；And by arranging tunnel surface position
Observation station is moved, monitoring shows exploiting field main entry almost without the mining influence by the working face and remains stable state, protects
Shield exploiting field main entry achieves good effect.
Claims (10)
1. a kind of coal working face end adopts return channel and cuts top release shield lane method, it is characterised in that：Include the following steps：
The first step calculates the periodic weighting step pitch L for determining that stope pushes up always,, in formula, L is that exploiting field is big
The periodic weighting step pitch that lane both sides stope pushes up always；h 2For the thickness of coal seam main roof strata；qMade by gravity for overlying rock
With and be applied to the uniform load on the main roof strata of coal seam；RTFor the ultimate tensile strength of main roof strata；
Second step, the position of mining device return channel at the end of apart from the position of exploiting field main entry S=2L, determining working face extraction
It sets, i.e., protection coal pillar width S=2L between working face the position of terminal mining line and exploiting field main entry；
Third walks, after installation is complete for the mining devices such as working face extraction tunnelling and open-off cut holder, in determining work
Face the position of terminal mining line digs a force piece along seat earth according to the direction parallel with exploiting field main entry and other back production are set
Standby return channel, return channel width are 2m, and return channel height is the minimum bearing height of working surface hydraulic support, is withdrawn
Using anchor metal or anchor cable and metal mesh combined supporting, return channel is close to return for channel top plate and the lateral wall of close exploiting field main entry
The lateral wall of mining face uses cleavable glass fibre reinforced plastics rockbolts and flame retardant plastics net combined supporting；
4th step sets depth since return channel one end is apart from the end positions 10m in return channel inner top panel centre position
Hole pre-splitting hole, all drillings are biased to return channel and start to punch 45 ° of end, i.e., the angle between drilling and vertical direction is 45 °；It bores
Bore dia Φ=75mm；Drilling depth H=（h 1+h 2）÷ sin45 °,h 1For the thickness that back production coal seam is directly pushed up,h 2For back production coal seam
The thickness pushed up always；Spacing distance between adjacent drillingl=5m, when the last one drilling the return channel other end between away from
When from less than 10m, stopping set drilling, all drillings set move towards in alignment along return channel, according to set priority
Sequence is numbered to the drilling set successively according to since 1；
5th step, after the completion of all drillings are all set, the watering and lowering dust in return channel prepares to start to load into drilling fried
Medicine loads explosive, as blast hole in the drilling that number is odd number；Explosive is not loaded in the drilling that number is even number, is made
The scope of freedom is provided for pilot hole, guiding roof strata moves towards cracking, i.e. deep hole blasting shape in roof strata along return channel
At precracking it is parallel with exploiting field main entry；
6th step loads explosive into blast hole using Uncoincided charge mode, is ignited using double detonator, double primacords, 2 thunders
Pipe is connected outside blast hole using parallel way, and every 3 blast holes are one group and using being connected in series with, if blast hole is less than 3
When be individually for one group, it is good to blow out bus insulation, hanging to hang；
7th step, using tamper by the explosive needed for each blast hole by volume load hole and shifting bottom hole onto, explosive payload it is small can
To be once packed into, loaded length is the drillable length that range is pushed up in coal seam always, i.e. loaded length is（h 2÷sin45°）；
Before filling first volume priming, first two primacords to be filled in powder stick in advance, the length that primacord stretches into powder stick is 200mm,
Blend compounds band, which twines, is made primer [cartridge], then this powder stick is sent to blast hole bottom hole with tamper；Then gradually it is packed into remaining medicine
Ready sealing of hole stemming is packed into blast hole and vibration compacting by volume after loaded length reaches design requirement, then with tamper；
8th step, all blast hole powder charge sealing of hole work are completed, and on line, after connection is good, busbar and payment to a porter are hanging, prevent from connecing
Ground；
9th step, is blown out using initiator, by group blasting in groups, using " local parallel is totally connected " between every group of blast hole
Mode on line, one group of charging hole of detonating every time, detonates successively from small to large by charging hole sequence；
Tenth step, all powder charge drillhole blastings finish, and wait for that blasting fume dispels, and check after confirming without misfire condition, in return channel two
End construction fire dam closes return channel；
11st step when working face extraction is advanced into return channel position, stops back production, removes the closed of return channel both ends
Wall withdraws from working surface hydraulic support and other mining devices from return channel.
2. a kind of coal working face end according to claim 1 adopts return channel and cuts top release shield lane method, feature exists
In：The a diameter of 75mm of deep hole presplitting Completion of Drilling Hole.
3. a kind of coal working face end according to claim 1 adopts return channel and cuts top release shield lane method, feature exists
In：The explosive is three-grade coal mine allowable emulsified explosive, and powder stick dimensions is 60 × 500mm of Φ, weight specification 1.5kg/
Volume.
4. a kind of coal working face end according to claim 1 adopts return channel and cuts top release shield lane method, feature exists
In：The detonator is allowed for use in coal mines 8# instant electric detonators.
5. a kind of coal working face end according to claim 1 adopts return channel and cuts top release shield lane method, feature exists
In：The primacord is coal permissible detonating cord, and ether peace, hexogen explosive are medicine core, with the works such as cotton thread and plastic knitting silk
Wrap is formed by damp-proof layer of plastics, and specification is 6.5 ± 0.3mm of Φ, explosion velocity >=6000m/s.
6. a kind of coal working face end according to claim 1 adopts return channel and cuts top release shield lane method, feature exists
In：The tamper is the socket bakelite tamper of Φ 30 mm × 2000 mm, is connected by steel bushing between adjacent tamper；Tamper front end
The wooden tamper head of Φ 50 mm × 500 mm is processed, the contact area of tamper and explosive cartridge and stemming is increased；Before tamper
The finer wire or nylon rope of an a diameter of 3mm are fixed on the wooden tamper head at end.
7. a kind of coal working face end according to claim 1 adopts return channel and cuts top release shield lane method, feature exists
In：The sealing of hole stemming is the cylindric strip stemming made by mining Stemming machine sand and loess, stemming dimensions
For Φ 60mm × 200m.
8. a kind of coal working face end according to claim 1 adopts return channel and cuts top release shield lane method, feature exists
In：The sealing of hole process of the blast hole carries out at twice, and first sealing of hole is at away from aperture 1m for the first time；When second of sealing of hole, by thunder
Dead band sealing of hole again is filled in hole after pipe, primacord binding securely, until blast hole all full tampings of envelope.
9. a kind of coal working face end according to claim 1 adopts return channel and cuts top release shield lane method, feature exists
In：The initiator is allowed for use in coal mines initiator.
10. a kind of coal working face end according to claim 1 adopts return channel and cuts top release shield lane method, feature exists
In：The fire dam of the return channel two ends is the temporary airtight wall of masonry bond.
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| CN201810378936.6A CN108661643B (en) | 2018-04-25 | 2018-04-25 | It a kind of coal working face end adopts return channel and cuts top release shield lane method |
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