CN106996305B - A kind of coal mine gob Adjacent Working Face relief range measuring method - Google Patents
A kind of coal mine gob Adjacent Working Face relief range measuring method Download PDFInfo
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- CN106996305B CN106996305B CN201710363902.5A CN201710363902A CN106996305B CN 106996305 B CN106996305 B CN 106996305B CN 201710363902 A CN201710363902 A CN 201710363902A CN 106996305 B CN106996305 B CN 106996305B
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- 239000003245 coal Substances 0.000 title claims abstract description 196
- 238000000034 method Methods 0.000 title claims abstract description 60
- 238000005553 drilling Methods 0.000 claims abstract description 123
- 238000010276 construction Methods 0.000 claims abstract description 41
- 230000000694 effects Effects 0.000 claims abstract description 14
- 230000005641 tunneling Effects 0.000 claims description 23
- 238000005086 pumping Methods 0.000 claims description 17
- 238000005520 cutting process Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 abstract description 9
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- 238000010586 diagram Methods 0.000 description 7
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- 238000007789 sealing Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000000391 smoking effect Effects 0.000 description 1
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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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- G—PHYSICS
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Abstract
A kind of coal mine gob Adjacent Working Face relief range measuring method is particularly suitable for buried depth less than 700m, the biggish coal seam of coal seam solid coefficient.In coal mine gob across backwardness, pass through drill site of constructing near gob side entry driving heading end, the gas bearing capacity with coal road tunnel contour line different distance coal body is measured to coal seam construction concordant drilling out of drill site, compared with the original gas bearing capacity in coal seam, judge away from tunnel 0~15m of contour line, whether the range of 0~10m and 0-5m, which is in goaf and is caving, causes within coal mass relief range, so that it is determined that goaf Adjacent Working Face coal seam pressure relief range.By measuring the gas bearing capacity with goaf difference normal distance coal seam sample, goaf is investigated across backward Adjacent Working Face coal seam pressure relief range, for instructing the pre- drilling design parameter for taking out coal roadway stripe coal-bed gas of concordant drilling and taking out coal seam range in advance, drilling construction number is effectively reduced and cost of drilling.Its method is simple, easy to operate, and effect is good.
Description
Technical field
The present invention relates to gas control technology field, specifically a kind of buried depth that is suitable for is less than 700m, coal seam
The underground goaf in the larger coal seam of solid coefficient is across the measuring method fallen to Adjacent Working Face coal seam pressure relief coverage.
Background technique
According to " prevention and treatment coal and gas prominent regulation " the 45th article of regulation: region outburst prevention measures refer to it is projecting coal bed into
Before row digging, outburst prevention measures that projecting coal bed larger range is taken.Region outburst prevention measures include exploitation protective layer and pre- pumping coal
Layer two class of gas.The pre- adoptable mode of coal-bed gas of taking out has: surface well takes out coal-bed gas and underground layer-through drilling or suitable in advance
The pre- pumping section coal-bed gas of layer drilling, layer-through drilling are taken out coal roadway stripe coal-bed gas, concordant drilling or layer-through drilling in advance and are drawn back in advance
Exploiting field domain coal-bed gas, layer-through drilling take out crossdrift (containing vertical, inclined shaft etc.) exposed coal regional coal-seam gas, the pre- pumping coal road of concordant drilling in advance
Band coal-bed gas etc..
According to the 210th article of " safety regulations in coal mine " regulation: there is the projecting coal bed of one of following condition, it must not will be
This roadway construction takes out coal roadway stripe gas along coal bed drilling as region outburst prevention measures in advance:
(1) New Built Mine is projecting coal bed；
(2) intensity of outburst occurred in history to be greater than 500t/ times；
(3) in limit of mining coal seam solid coefficient less than 0.3；Or coal seam solid coefficient is 0.3~0.5, and
Buried depth is greater than 500m's；Or coal seam solid coefficient is 0.5~0.8, and buried depth is greater than 600m's；Or coal seam buried depth is greater than
700m's；Or coal roadway stripe is located at exploitation stress concentration region.
Therefore, the applicable elements of coal roadway stripe construction are as follows: new well does not have the high gas layer of outburst hazard or in history
The coal seam that intensity of outburst is less than 500t/ coal and gas prominent did not occurred, and coal roadway stripe must not be located at exploitation stress collection
Middle area.When wherein coal seam solid coefficient is greater than 0.5, coal seam buried depth is less than 500m；When coal seam solid coefficient is greater than 0.8,
Coal seam buried depth is less than 600m；Or coal seam buried depth is less than 700m.
According to " prevention and treatment coal and gas prominent provides " the 49th article of regulation: taking the Yu Chou coal-bed gas area of various modes
When the outburst prevention measures of domain, it should meet the following requirements:
(1) layer-through drilling or the pre- drilling for taking out section coal-bed gas region outburst prevention measures of concordant drilling should control zones
Interior entire exploitation block, a certain range of coal seam of two sides stope drift active workings and its outside.It is required that outside drilling control stope drift active workings
The range of side is: at least 20m, lower side at least 10m outside contour line are helped in inclination, half-edge coal seam tunnel；Other are tunnel two sides
At least each 15m outside contour line.Above-described drilling control range is the distance along level, the same below；
(2) drilling that layer-through drilling takes out coal roadway stripe coal-bed gas region outburst prevention measures in advance should control whole coal seam lane
The a certain range of coal seam in road and its two sides.The range is identical as the requirement on the outside of stope drift active workings in this Section 1；
(3) drilling that concordant drilling or layer-through drilling draw back exploiting field domain coal-bed gas region outburst prevention measures in advance should control
The coal seam of entire exploitation block；
(4) layer-through drilling is taken out crossdrift (containing vertical, inclined shaft etc.) exposed coal regional coal-seam gas region outburst prevention measures in advance and should taken off
Implement (should suitably increase distance in structure destruction band) before minimum normal distance 7m of the coal working face away from coal seam.The minimum of drilling
Control range is: contour line outer 12m (half-edge coal seam bottom or lower side 6m) in tunnel at crossdrift and vertical, inclined shaft exposed coal, simultaneously
It also should be guaranteed that the outer edge of control range to the minimum of tunnel contour line (contour line including estimated front exposed coal section tunnel)
Distance is not less than 5m, and when drilling cannot once penetrate coal seam thickness entirely, coal hole minimum advance should be kept away from 15m.
The present invention determines that the pre- coal roadway stripe coal-bed gas of smoking of concordant drilling screens coal roadway tunneling according to above-mentioned pertinent regulations
Drilling construction range is to investigate goaf (stay and set 5-8 coal column gob side entry driving) away from tunnel outline method 0~15m of linear distance and be caving
Adjacent Working Face coal seam pressure relief range is within away from tunnel 0~15m of outline method linear distance or in addition afterwards.
Summary of the invention
Technical problem: the purpose of the present invention will overcome shortcoming in the prior art, provide that a kind of method is simple, operation
Coal mine gob Adjacent Working Face relief range measuring method that is convenient, can be reduced drilling construction number and cost of drilling.
Technical solution: coal mine gob Adjacent Working Face relief range measuring method of the invention includes the following steps:
A. after goaf is caving completely, width d is left and taken in goaf side1For 5~8m coal column, in the other side coal of coal column
A width d is tunneled in layer2For the heading of 4~6m；
B. apart from coalhead C1For drill site of constructing at 5~10m, release is used as from making a call to 3 in drill site into coal seam
The advanced concordant in range test hole drills, and 3 advanced collimation method linear distances of the concordant drilling away from tunnel profile are respectively L1、L2And L3,
3 advanced concordant drillings and the angle of coal wall are respectively β1、β2And β3, drillable length is respectively H1、H2And H3；
C. when construction arrives advance borehole away from the outline method linear distance position of tunnel respectively for 3 advanced concordant drillings, point
The normal distance L of tunnel profile is not taken1、L2And L3Drilling cuttings coal sample at node is measured respectively using direct method away from tunnel contour line
Normal distance L1、L2And L3The gas bearing capacity of 3 measuring points corresponding to node；
D. by the comparison of the gas bearing capacity of 3 measuring points and the original gas bearing capacity in coal seam, relief range and concordant drilling are determined
The case where boundary of works area, to take corresponding gas control scheme.
3 concordant advance boreholes it is advanced away from C2It is set as 20~60m.
The drilling is away from tunnel outline method linear distance L1、L2、L3Respectively 5m, 10m, 15m, 3 advanced concordants
The angle β of drilling and coal wall1、β2、β3Respectively 11.3 °, 21.8 °, 31.0 °.
The determining relief range and concordant drilling construction range have following 4 kinds of situations:
1) when drilling is away from tunnel outline method linear distance L1、L2And L3The gas bearing capacity surveyed at node is respectively less than coal seam original
When beginning gas bearing capacity, after illustrating that goaf is caving, Adjacent Working Face is apart from coal road tunnel outline method linear distance L3Within coal
Layer release effect is fine, without the concordant mash gas pumping drilling of construction shielding coal roadway tunneling；
2) when drilling is away from tunnel outline method linear distance L1And L2The gas bearing capacity surveyed at node is less than the original gas in coal seam
Content drills away from tunnel outline method linear distance L3Surveyed gas bearing capacity is equal to the original gas bearing capacity in coal seam at node, and explanation is adopted
After dead zone is caving, Adjacent Working Face release effect is preferable, and relief range is in drilling away from tunnel outline method linear distance L2Within, it should
Region does not have to the concordant mash gas pumping drilling of construction shielding coal roadway tunneling；And in tunnel outline method linear distance L2-L3The coal in region
It must construct in layer and screen the concordant mash gas pumping drilling of coal roadway tunneling；
3) when away from coal road tunnel outline method linear distance be L1Measuring point measure gas bearing capacity and contain less than the original gas in coal seam
Amount, L2And L3The surveyed gas bearing capacity of gas bearing capacity measuring point is equal to the original gas bearing capacity in coal seam, after illustrating that goaf is caving, adjacent work
It is relatively poor to make face release effect, relief range is apart from tunnel outline method linear distance L1Within, which does not have to construct suitable
Layer drilling shielding coal roadway tunneling；And apart from tunnel outline method linear distance L1-L3The coal seam in region must construct concordant drilling cover
Protect coal roadway tunneling；
4) when being respectively L away from coal road tunnel outline method linear distance1、L2And L3The surveyed gas bearing capacity of measuring point is equal to coal seam
Original gas bearing capacity, after illustrating that goaf is caving, Adjacent Working Face release poor effect, apart from tunnel outline method linear distance
L3The coal seam in region must construct, and concordant drilling is pre- to take out coal roadway stripe coal-bed gas shielding coal roadway tunneling,
The concordant mash gas pumping drilling of the construction shielding coal roadway tunneling, concordant mash gas pumping drilling screen coal roadway stripe model
Distance is enclosed to meet head on normal distance C3For 20~60m, crossover distance is 5~10m, whole pitch of holes Z1For 2~3m.
The utility model has the advantages that the present invention in coal mine gob across backwardness, reserve one fixed width coal column gob side entry driving to adjacent
Working face coal seam pressure relief coverage is measured, by coalhead drill site to working face coal seam construct advance borehole,
It measures apart from tunnel contour line difference normal distance measuring point gas bearing capacity, then former by comparing measuring point coal seam gas-bearing capacity and coal seam
The size of beginning gas bearing capacity determines measuring point coal seam whether within the relief range of goaf, so that it is determined that concordant drilling is pre- to take out coal
The drilling design scheme of lane band coal-bed gas, to reduce drilling construction number and cost of drilling.Goaf has been given full play to collapse
The release effect caused by the coal body of periphery is fallen to apply in drill site to coal seam by drill site of constructing near gob side entry driving heading end
The gas bearing capacity with coal road tunnel contour line different distance coal body is measured in the drilling of work concordant, compared with the original gas bearing capacity in coal seam,
Judge the range away from tunnel 0~15m of contour line, 0~10m and 0-5m whether be in goaf be caving cause coal mass relief range with
It is interior, so that it is determined that goaf Adjacent Working Face coal seam pressure relief range, instructs concordant drilling construction range and concordant to drill and takes out coal in advance
Lane band coal-bed gas specific embodiment can effectively reduce drilling construction number and cost of drilling, be particularly suitable for new well
There is no the high gas layer of outburst hazard or the coal that intensity of outburst is less than 500t/ coal and gas prominent did not occurred in history
Layer, and coal roadway stripe must not be located at exploitation stress concentration region.When wherein coal seam solid coefficient is greater than 0.5, coal seam buried depth
Less than 500m；When coal seam solid coefficient is greater than 0.8, coal seam buried depth is less than 600m；Or coal seam buried depth is less than 700m.Its method
Simplicity, convenient to carry out, a coal working face need to only measure a gob side entry driving Adjacent Working Face release model before coal roadway tunneling
It encloses, each circulation construction mash gas pumping drilling scheme is fixed during coal roadway tunneling, saves drilling, strong operability.
Detailed description of the invention
Fig. 1 is gob side entry driving Adjacent Working Face relief range drilling construction scheme schematic diagram of the invention；
Fig. 2-1 is one schematic diagram of concordant extraction borehole Construction State of the invention；
Fig. 2-2 is two schematic diagram of concordant extraction borehole Construction State of the invention；
Fig. 2-3 is three schematic diagram of concordant extraction borehole Construction State of the invention；
Fig. 2-4 is four schematic diagram of concordant extraction borehole Construction State of the invention.
Wherein: the goaf 1-；2- prearranged pillar；3- coalhead；The coal seam 4-；5- heading；6- drill site；The tunnel 7-
Contour line；8-#1 drilling gas contains measuring point；9-#2 drilling gas contains measuring point；10-#3 drilling gas contains measuring point；11- is suitable
Layer drilling.
Specific embodiment
The present invention is further illustrated for embodiment in reference to the accompanying drawing:
As shown in Figure 1, coal mine gob Adjacent Working Face relief range measuring method of the invention, first in working face coal
Before the heading end of lane 5~10m excavate 3m × 3m × 3m drill site, with portable drill to coal seam construct 3 concordant advance boreholes,
In advance away from for 20~60m, the borehole bottom location that drills is respectively L away from tunnel outline method linear distance1、L2And L3Place takes drilling cuttings coal sample, adopts
With Direct Determination coal sample gas bearing capacity, see whether 3 measuring point gas bearing capacities are less than the original gas bearing capacity in the coal seam, determination is surveyed
Whether region is within the scope of the Adjacent Working Face coal seam pressure relief of goaf, to take corresponding gas control scheme；Specific step
It is rapid as follows:
A. after goaf is caving completely, width d is left and taken in goaf side1For 5~8m coal column 2, in the other side of coal column 2
A width d is tunneled in coal seam2For 4~6m, be highly 4~5m heading 5；
B. 3m × 3m × 3m drill site 6 is being excavated at 5~10m before coalhead 3, from applying in drill site into coal seam 4
Work 3 drills as the advanced concordant of relief range instrument connection, 3 concordant advance boreholes it is advanced away from being 20~60m；3
Advanced collimation method linear distance of the concordant drilling away from tunnel profile is respectively L1、L2And L3, drill away from tunnel outline method linear distance L1、
L2、L3Respectively 5m, 10m, 15m, 3 advanced concordant drillings and the angle of coal wall are respectively β1、β2And β3, angle β1、β2、β3Point
It Wei not be 11.3 °, 21.8 °, 31.0 °.
C. when construction arrives advance borehole away from the outline method linear distance position of tunnel respectively for 3 advanced concordant drillings, point
The normal distance L of tunnel profile is not taken1For 5m, L2For 10m, L3For the drilling cuttings coal sample at 15m node, surveyed respectively using direct method
Spacing tunnel outline method linear distance L1For 5m, L2For 10m, L3For 3 measuring point (#1 drilling gas contents corresponding to 15m node
Measuring point 8, #2 drilling gas contain measuring point 10 containing measuring point 9 and #3 drilling gas) gas bearing capacity；
D. by 3 measuring points, (#1 drilling gas is containing measuring point 8, #2 drilling gas containing measuring point 9 and #3 drilling gas containing measurement
The comparison of point gas bearing capacity 10) and the original gas bearing capacity in coal seam, the case where determining relief range and concordant drilling construction range,
To take corresponding gas control scheme.
The determining relief range and concordant drilling construction range have following 4 kinds of situations:
1) when drilling is away from tunnel outline method linear distance L1、L2And L3Locate node #1 drilling gas to drill containing measuring point 8, #2
When gas bearing capacity measuring point 9 and #3 drilling gas are respectively less than the original gas bearing capacity in coal seam containing the gas bearing capacity that measuring point 10 is surveyed, say
After bright goaf is caving, Adjacent Working Face is apart from coal road tunnel outline method linear distance L3Within coal seam pressure relief effect it is fine,
Without the concordant mash gas pumping drilling of construction shielding coal roadway tunneling；Concordant extraction borehole Construction State floor map is shown in attached drawing 2-
1。
2) when drilling is away from tunnel outline method linear distance L1And L2#1 drilling gas is containing measuring point 8 and #2 drilling watt at node
This is less than the original gas bearing capacity in coal seam containing the gas bearing capacity that measuring point 9 is surveyed, and drills away from tunnel outline method linear distance L3Node
Place surveys gas bearing capacity and is equal to the original gas bearing capacity in coal seam, and after illustrating that goaf is caving, Adjacent Working Face release effect is preferable, unloads
Press range in drilling away from 7 normal distance L of tunnel contour line2Within, i.e. within 10m, which does not have to construction shielding coal roadway tunneling
Concordant mash gas pumping drilling；And in 7 normal distance L of tunnel contour line2-L3It must construct and cover in the coal seam in the region (10-15m)
Protect the concordant mash gas pumping drilling of coal roadway tunneling；Concordant extraction borehole Construction State floor map is shown in attached drawing 2-2, concordant drilling
Shielding coal roadway stripe range distance is met head on 20~60m of normal distance, i.e., each to recycle to 20~60m range construction in front of working face
Concordant drilling, crossover distance are 5~10m, and extraction borehole end pitch of holes is 2~3m.
3) when away from coal road tunnel outline method linear distance be L1#1 drilling gas measures gas bearing capacity containing measuring point 8 at node
Less than the original gas bearing capacity in coal seam, L2And L3#2 drilling gas surveyed gas containing measuring point 10 containing measuring point 9 and #3 drilling gas contains
Amount is equal to the original gas bearing capacity in coal seam, and after illustrating that goaf is caving, Adjacent Working Face release effect is relatively poor, and relief range is
Apart from 7 distance L of tunnel contour line normal1Within, i.e. within 5m, which does not have to construction concordant drilling shielding coal roadway tunneling；And
Apart from 7 distance L of tunnel contour line normal1-L3The coal seam in the region (5-15m) must construct concordant drilling shielding coal roadway tunneling；It is suitable
Layer drilling construction state plane schematic diagram is shown in that attached drawing 2-3, concordant extraction borehole screen coal roadway stripe range distance frontal method line-spacing
From 20~60m, i.e., each to recycle to 20~60m range construction concordant drilling in front of working face, crossover distance is 5~10m, extraction
The whole pitch of holes that drills is 2~3m.
4) when being respectively L away from coal road tunnel outline method linear distance1、L2And L3Node #1 drilling gas contains measuring point 8, #2
Drilling gas surveyed gas bearing capacity containing measuring point 10 containing measuring point 9 and #3 drilling gas is equal to the original gas bearing capacity in coal seam, says
After bright goaf is caving, Adjacent Working Face release poor effect, apart from 7 distance L of tunnel contour line normal3The region (0-15m)
Coal seam must construct that concordant drilling is pre- to take out coal roadway stripe coal-bed gas shielding coal roadway tunneling；Concordant extraction borehole Construction State is flat
Face schematic diagram is shown in attached drawing 2-4, and concordant drilling shielding coal roadway stripe range distance is met head on 20~60m of normal distance, i.e., each circulation
20~60m range construction concordant drilling in front of to working face, crossover distance are 5~10m, and extraction borehole end pitch of holes is 2~3m.
After the completion of the concordant extraction borehole construction, need to carry out drilling sealing of hole, gas of networking after the completion of drilling sealing
Extraction system, after extraction is up to standard can drill shielding in the range of coal driving.
Claims (4)
1. a kind of coal mine gob Adjacent Working Face relief range measuring method, which comprises the steps of:
A. after goaf is caving completely, width d is left and taken in goaf side1For 5~8m coal column, in the other side coal seam of coal column
Tunnel a width d2For the heading of 4~6m；
B. apart from coalhead distance C1For drill site of constructing at 5~10m, release model is used as from making a call to 3 in drill site into coal seam
The advanced concordant drilling of test is enclosed, 3 advanced concordant drillings are respectively L away from tunnel outline method linear distance1、L2And L3, 3 super
Preceding concordant drilling and the angle of coal wall are respectively1、ß2With3；
C. it when construction arrives advance borehole away from the outline method linear distance position of tunnel respectively for 3 advanced concordant drillings, takes respectively
The normal distance L of tunnel profile1、L2And L3Drilling cuttings coal sample at node is measured using direct method respectively away from tunnel contour line normal
Distance L1、L2And L3The gas bearing capacity of 3 measuring points corresponding to node；
D. by the comparison of the gas bearing capacity of 3 measuring points and the original gas bearing capacity in coal seam, relief range and concordant drilling construction are determined
The case where range, to take corresponding gas control scheme；
The determining relief range and concordant drilling construction range have following 4 kinds of situations:
1) when drilling is away from tunnel outline method linear distance L1、L2And L3The gas bearing capacity surveyed at node is respectively less than original watt of coal seam
When this content, after illustrating that goaf is caving, Adjacent Working Face is apart from coal road tunnel outline method linear distance L3Within coal seam unload
Press effect fine, without the concordant mash gas pumping drilling of construction shielding coal roadway tunneling；
2) when drilling is away from tunnel outline method linear distance L1And L2The gas bearing capacity surveyed at node is less than the original gas in coal seam and contains
Amount drills away from tunnel outline method linear distance L3Surveyed gas bearing capacity is equal to the original gas bearing capacity in coal seam at node, illustrates mined out
After area is caving, Adjacent Working Face release effect is preferable, and relief range is in drilling away from tunnel outline method linear distance L2Within, the area
Domain does not have to the concordant mash gas pumping drilling of construction shielding coal roadway tunneling；And in tunnel outline method linear distance L2-L3The coal seam in region
Interior must construct screens the concordant mash gas pumping drilling of coal roadway tunneling；
3) when away from coal road tunnel outline method linear distance be L1Measuring point measure gas bearing capacity less than the original gas bearing capacity in coal seam, L2
And L3The surveyed gas bearing capacity of gas bearing capacity measuring point is equal to the original gas bearing capacity in coal seam, after illustrating that goaf is caving, Adjacent Working Face
Release effect is relatively poor, and relief range is apart from tunnel outline method linear distance L1Within, which does not have to construction concordant and bores
Hole screens coal roadway tunneling；And apart from tunnel outline method linear distance L1- L3The coal seam in region must construct concordant drilling shielding
Coal roadway tunneling；
4) when being respectively L away from coal road tunnel outline method linear distance1、L2And L3It is original that the surveyed gas bearing capacity of measuring point is equal to coal seam
Gas bearing capacity, after illustrating that goaf is caving, Adjacent Working Face release poor effect, apart from tunnel outline method linear distance L3Area
The coal seam in domain must construct, and concordant drilling is pre- to take out coal roadway stripe coal-bed gas shielding coal roadway tunneling.
2. a kind of coal mine gob Adjacent Working Face relief range measuring method according to claim 1, it is characterised in that:
The advanced concordant of described 3 drills advanced away from C2It is 20~60m.
3. a kind of coal mine gob Adjacent Working Face relief range measuring method according to claim 1, it is characterised in that:
The drilling is away from tunnel outline method linear distance L1、L2、L3Respectively 5m, 10m, 15m, described 3 advanced concordant drillings and coal
The angle of wall1、ß2、ß3Respectively 11.3,21.8,31.0.
4. a kind of coal mine gob neighbour working face relief range measuring method according to claim 1, it is characterised in that: institute
The concordant mash gas pumping drilling of construction shielding coal roadway tunneling is stated, concordant mash gas pumping drilling shielding coal roadway stripe range distance is met head on
Normal distance C3For 20 ~ 60m, crossover distance is 5 ~ 10m, whole pitch of holes Z1For 2-3m.
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| CN109578055B (en) * | 2018-11-21 | 2021-04-16 | 张登龙 | Method for preventing and treating coal and CO2 outburst accidents |
| CN112392538B (en) * | 2020-11-18 | 2023-03-14 | 太原理工大学 | Progressive shield type bedding hydraulic cave construction method for tunneling working face of structural coal seam |
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| RU2152518C1 (en) * | 1998-12-28 | 2000-07-10 | Национальный научный центр горного производства - ИГД им. А.А. Скочинского | Method of outgassing of chipped coal-bearing thickness |
| CN101240715A (en) * | 2008-01-24 | 2008-08-13 | 淮北矿业（集团）有限责任公司 | One well three-purpose mash gas harnessing method for ground well drilling and ground well drilling |
| CN101672196B (en) * | 2009-09-23 | 2011-08-10 | 中国矿业大学 | Method for improving amount of drained, extracted and pressure released gas in surface well drilling |
| CN103334790B (en) * | 2013-07-23 | 2015-10-28 | 辽宁工程技术大学 | Based on the roof Advance presplitting method of high pressure pneumatic component |
| CN106223998B (en) * | 2016-09-23 | 2018-05-01 | 安徽理工大学 | Rock protective layer face gas administering method under a kind of closely tight roof |
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