CN108661643B - 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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- 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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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 that advanced support pressure is adopted by deep hole presplitting roof cutting working face, and it provides and a kind of shifts to an earlier date digging work face support unit return channel along the position of terminal mining line and deep hole presplitting roof cutting working face adopts the propagation path of advanced support pressure, exploiting field main entry is protected not by two sides stope mining influence and reduces working face and stops adopting method of the width of protection coal pillar between line and exploiting field main entry to improve exploiting field recovery ratio.The present invention improves the exploiting field recovery ratio of non-renewable coal resources under the premise of guaranteeing 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 cutting 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 two sides stope mining influence and diminution
Method to improve exploiting field recovery ratio.
Background technique
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 in field with "nine squares" with independent transport and ventilating system, moves towards medium position arrangement exploiting field in exploiting field and transports
Defeated upper (lower) mountain, the upper (lower) mountain of exploiting field track are each responsible for the transport and ventilation task of entire exploiting field getting working face, referred to as adopt
Area's main entry.Exploiting field main entry runs through entire exploiting field, is typically located at exploiting field and moves towards central location, is respectively arranged in exploiting field main entry two 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 two sides stope, maintenance situation is in addition to the natural cause by tunnel present position
Outside influencing, the mining influence of two sides stope is depended primarily on.
In order to ensure the safety of exploiting field main entry, exploiting field main entry two sides stope, which generally all stays, sets the biggish 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 two sides working face to adopt exploiting field main entry between line and exploiting field main entry
The dynamic contradiction influenced between construction high-yield and high-efficiency modern mine, raising exploiting field recovery ratio 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 and device of line position " patent, the method for optimization the position of terminal mining line are 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 requirement of dynamics 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, can equipment to surrounding and constructor
Member causes centainly to injure, and there is very big security risk.
In order to weaken the mining influence that two 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 guaranteeing exploiting field main entry safety and stability, for the exploiting field extraction for improving non-renewable coal resources
Rate, there is an urgent need to seek, one kind digging support unit return channel along the position of terminal mining line in advance 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 two sides stope mining influence and contracting
Small working face stops adopting method of the width of protection coal pillar between line and exploiting field main entry to improve exploiting field recovery ratio.
Summary of the invention
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 passes through depth
Hole presplitting roof cutting working face adopts the propagation path of advanced support pressure, and provides one kind and mention along the position of terminal mining line
Preceding digging work face support unit return channel and deep hole presplitting roof cutting 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 two 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:
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 to adopt
The periodic weighting step pitch that area main entry two sides stope pushes up always；h 2For the thickness of coal seam main roof strata；qIt is overlying rock by weight
Power acts on and is applied to the uniform load on the main roof strata of coal seam；RTFor the ultimate tensile strength of main roof strata；
Second step, in the position apart from exploiting field main entry S=2L, at the end of determining working face extraction, mining device return channel
Position, i.e., protection coal pillar width S=2L between working face the position of terminal mining line and exploiting field main entry；
Third step, after working face extraction tunnelling and open-off cut bracket mining device are installed, in determining work
Make face the position of terminal mining line according to the direction parallel with exploiting field main entry along seat earth dig a working surface hydraulic support and other
The return channel of mining device, return channel width are 2m, and return channel height is that the minimum support of working surface hydraulic support is high
Degree, return channel top plate and the lateral wall close to exploiting field main entry use anchor metal or anchor cable and metal mesh combined supporting, withdraw logical
Road uses cleavable glass fibre reinforced plastics rockbolts and flame retardant plastics net combined supporting close to the lateral wall of stope；
4th step is beaten since return channel one end is apart from the end position 10m in return channel inner top panel middle position
If deep hole presplitting drills, all drillings are biased to return channel and start to punch 45 ° of end, i.e. angle between drilling and vertical direction is
45°；Bore diameter Φ=75mm；Drilling depth H=(h 1+h 2) ÷ sin45 °,h 1For the thickness that back production coal seam is directly pushed up,h 2To return
The thickness that mining coal seam pushes up always；Spacing distance between adjacent drillingl=5m, when the last one drilling with the return channel other end it
Between distance less than 10m when, stopping sets drilling, and all drillings set move towards in alignment along return channel, according to beating
If sequencing is successively numbered to the drilling set 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 built-in to drilling
Explosive is filled out, explosive is loaded in the drilling that number is odd number, as blast hole；It is not loaded in the drilling that number is even number fried
Medicine provides the scope of freedom as pilot hole, and guidance roof strata moves towards cracking along return channel, i.e., deep hole blasting is in roof strata
The precracking of interior formation 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
A detonator is connected outside blast hole using parallel way, and every 3 blast holes are one group and using being connected in series, if blast hole is insufficient
One group is individually at 3, it is good to blow out bus insulation, hanging to hang；
7th step, using tamper by explosive needed for each blast hole by rolling up in load hole and shifting bottom hole onto, explosive payload is small
Can once be packed into, loaded length is that the drillable length of range is pushed up in coal seam always, i.e., loaded length be (h 2÷ sin45 °)；
Before filling first volume priming, first two primacords are filled in powder stick in advance, the length that primacord protrudes 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 it is gradually packed into
Ready sealing of hole stemming after loaded length reaches design requirement, then is packed into blast hole with tamper and vibrated by remaining powder stick
Closely knit, primacord must not be damaged in the process by blocking stemming；
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, bus
It is hanging with payment to a porter, it prevents from being grounded；
9th step, is blown out using initiator, by group blasting in groups.Using " local parallel, overall string between every group of blast hole
Connection " mode on line, one group of charging hole of detonating every time, successively detonates from small to large by charging hole sequence；
Tenth step, all powder charge drillhole blastings are finished, are dispelled to blasting fume, logical withdrawing after checking confirmation without misfire condition
Road both ends construction fire dam closes return channel；
11st step when working face extraction is advanced into return channel position, stops back production, removes the close of return channel both ends
Wall is closed, 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 detonator, 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
Make wrap, 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 between adjacent tamper by steel bushing；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 that a diameter is 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 by the cylindric strip stemming of mining Stemming machine sand and loess production, and closure has filled
The blast hole of explosive is filled in, stemming dimensions is Φ 60mm × 200m, and stemming is homogeneous, and neither too hard, nor too soft, 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 in two times, 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
The wall perps at bottom, masonry is staggered, and transverse joint is horizontal, and marshalling, mortar is full, metope fine ash mortar-chalked joint or completely smears.
Beneficial effects of the present invention are as follows:
Technical solution provided by aforementioned present invention by along the position of terminal mining line shift to an earlier date digging work face bracket and other
Mining device return channel and deep hole presplitting roof cutting working face adopt the propagation path of advanced support pressure, reduce
Two 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,
Under the premise of guaranteeing 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 the periodic weighting step pushed up always with twice of stope coal seam
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 bracket in advance and the return channel of other equipment are set, arranges blast hole and pilot hole 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 cuts off propagation path of the stope advanced support pressure in roof strata, reduces two sides actual mining and face
The mining influence of exploiting field main entry is, it can be achieved that realize the safety of exploiting field main entry country rock in the case where staying and setting smaller width protection coal pillar
Stablize.
Detailed description of the invention
Fig. 1 is exploiting field main entry of the present invention and two 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 schematic 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: transporting upper (lower) mountain in the exploiting field 1-；The exploiting field the 2- upper (lower) mountain of track；3- stope；The goaf 4-；5- is left
Stop adopting line in side；Stop adopting line on the right side of 6-；7- return channel I；8- return channel II；9- is directly pushed up in coal seam；The coal seam 10- Lao Ding；11- is bored
Hole；The wooden tamper head of 12-；13- wirerope；14- connection steel bushing；15- bakelite tamper；16- primacord I；17- primer [cartridge]；18-
Primacord II；19- explosive cartridge；20- sealing of hole stemming；21- detonator；22- payment to a porter；23- fully mechanized coal face；The return aircourse 24-；25 into
Air way road；26- pilot hole；27- blast hole.
Specific embodiment
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 seam 15#, moves towards central location in exploiting field and arranges an exploiting field haulage drift and an exploiting field time by 4 ° of seam inclination average out to
Air way road is each responsible for the transport and ventilation task of exploiting field two 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 two 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.
It is 190m that the exploiting field side fully mechanized coal face, which is inclined to length, and working face strike length is 860m.It is bored according to geology
Hole data shows, the Sandy Silt or mud stone that the coal seam 15# is directly pushed up as 4.2m thickness, the K of Lao Dingwei 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 the mining devices such as Mining Roadway in Full-mechanized Caving Mining Face driving and open-off cut bracket are installed, 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 every anchor pole uses K2335 and Z2360 resin explosive roll Anchor Agent each one, and metal mesh is to be compiled by No. 10 iron wires
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 is completed, 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.
Explosive is loaded in the drilling (1#, 3# ... ..., 35#) that number is odd number, as blast hole, totally 18 filling explosive blasting holes；
Explosive is not loaded in the drilling (2#, 4# ..., 34#) that number is even number, provides the scope of freedom as pilot hole, totally 17 do not fill
Fill out explosive drilling.
The loaded length of each blast hole be (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 protrudes 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 position 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, bus with
Payment to a porter is hanging, and pressing 3 blast holes using initiator is one group of blasting in groups.All powder charge drillhole blastings finish, and dispel to blasting fume,
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 in back production be advanced to the position of terminal mining line 8 months, 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 stopping adopting protection coal pillar between line and exploiting field main entry is 32m, digs branch 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 pillar, 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 pass through arrangement tunnel surface position
Observation station is moved, monitoring shows that exploiting field main entry remains stable state almost without the mining influence by the working face, 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, characterized by 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 two sides stope pushes up always；h 2For the thickness of coal seam main roof strata；qMade for overlying rock by gravity
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 determines the position of mining device return channel at the end of working face extraction in the position apart from exploiting field main entry S=2L
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 step, when mining devices all in working face extraction tunnelling and open-off cut are installed, after having back production condition,
It is hydraulic along seat earth one working face of digging according to the direction parallel with exploiting field main entry in determining working face the position of terminal mining line
The return channel of bracket and other mining devices, return channel width are 2m, and return channel height is working surface hydraulic support
Minimum bearing height, return channel top plate and the lateral wall close to exploiting field main entry combine branch using anchor metal or anchor cable and metal mesh
Shield, return channel use cleavable glass fibre reinforced plastics rockbolts and flame retardant plastics net combined supporting close to the lateral wall of stope；
4th step sets depth in return channel inner top panel middle position since return channel one end is apart from the end position 10m
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 sets drilling, and all drillings set move towards in alignment along return channel, successive according to setting
Sequence is successively numbered to the drilling set 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 in the drilling that number is odd number, as blast hole；Explosive is not loaded in the drilling that number is even number, is made
The scope of freedom is provided for pilot hole, guidance 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, 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 explosive needed for each blast hole by volume load hole and shifting bottom hole onto, explosive payload it is small one
Secondary loading, loaded length are that the drillable length of range is pushed up in coal seam always, i.e., loaded length be (h 2÷ sin45 °)；
Before filling first volume priming, first two primacords to be filled in powder stick in advance, the length that primacord protrudes 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 after loaded length reaches design requirement, then with tamper by volume；
8th step, all blast hole powder charge sealing of hole work are completed, and on line, after connection is good, bus 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, successively detonates from small to large by charging hole sequence；
Tenth step, all powder charge drillhole blastings are finished, are dispelled to blasting fume, after checking confirmation 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 deep hole presplitting Completion of Drilling Hole diameter is 75mm.
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 detonator.
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, is wrapped with cotton thread and plastic knitting silk
Object is twined, is formed by damp-proof layer of plastics, 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 between adjacent tamper by steel bushing；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 that a diameter is 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 by the cylindric strip stemming of mining Stemming machine sand and loess production, 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 in two times, 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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| CN109372508B (en) * | 2018-12-18 | 2024-03-12 | 中煤能源研究院有限责任公司 | Underground hydraulic directional roof cutting equipment for coal mine and construction method thereof |
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| CN109882177B (en) * | 2019-04-04 | 2022-03-08 | 中国矿业大学(北京) | Coordinated operation method for realizing working face recovery, roadway retaining, moving and coal pillar recovery |
| CN110186340A (en) * | 2019-06-28 | 2019-08-30 | 山东新巨龙能源有限责任公司 | Fully-mechanized mining working meets the method to make smooth advances when tomography |
| CN110295880B (en) * | 2019-07-04 | 2021-05-14 | 中国矿业大学 | Method for optimizing stoping line of multi-dimensional hydraulic fracturing coal seam roof |
| CN110847909B (en) * | 2019-11-15 | 2020-11-20 | 山东科技大学 | Method for reducing top plate pressure of withdrawal channel at last stage of coal face extraction |
| CN111022048B (en) * | 2019-11-16 | 2021-06-04 | 西安科技大学 | Fully mechanized coal mining face withdrawing and final mining method |
| CN112179228B (en) * | 2020-09-29 | 2022-08-16 | 太原理工大学 | Deep hole subsection blasting joint cutting control top plate overall collapse method |
| CN112179227A (en) * | 2020-10-10 | 2021-01-05 | 河南理工大学 | Coal face ultra-deep hole blasting roof cutting pressure relief control method and blasting charge structure |
| CN115077318B (en) * | 2021-07-22 | 2023-10-27 | 四川公路桥梁建设集团有限公司 | Simple connection process of quick charging method for smooth blasting of tunnel and detonation network |
| CN113756809B (en) * | 2021-09-29 | 2023-09-05 | 太原理工大学 | Load migration impact mine pressure prevention and control method for ground fracturing thick and hard rock stratum |
| CN114183138B (en) * | 2021-10-12 | 2023-10-20 | 安徽理工大学 | Coal bed non-mining drilling pre-splitting blasting method |
| CN113863927B (en) * | 2021-10-12 | 2023-10-24 | 安徽理工大学 | Method for pre-cutting roof and releasing pressure of coal seam working face |
| CN114201866B (en) * | 2021-12-02 | 2024-04-09 | 安徽理工大学 | Method for protecting top of retractive roadway of stope for ascending and descending mountain |
| CN114739248A (en) * | 2022-04-14 | 2022-07-12 | 中钢集团马鞍山矿山研究总院股份有限公司 | Charging method for horizontal hole in underground mine fractured rock mass |
| CN115012936B (en) * | 2022-07-13 | 2023-03-21 | 安徽理工大学 | Pressure relief and danger relieving method for coal mine TBM during tunneling and coal penetration |
| CN116988831B (en) * | 2023-09-27 | 2023-12-12 | 太原理工大学 | Roof fracture form-based coal mine initial mining period I-shaped filling method |
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| CN106894816A (en) * | 2017-02-23 | 2017-06-27 | 中国矿业大学 | Far field key stratum based on set square structural model cuts top release shield lane method |
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