CN106996305A - A kind of coal mine gob Adjacent Working Face relief range assay method - Google Patents
A kind of coal mine gob Adjacent Working Face relief range assay method Download PDFInfo
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- CN106996305A CN106996305A CN201710363902.5A CN201710363902A CN106996305A CN 106996305 A CN106996305 A CN 106996305A CN 201710363902 A CN201710363902 A CN 201710363902A CN 106996305 A CN106996305 A CN 106996305A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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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Abstract
A kind of coal mine gob Adjacent Working Face relief range assay method, the buried depth that is particularly suitable for use in is less than 700m, the larger coal seam of coal seam solid coefficient.In coal mine gob across backwardness, pass through drill site of being constructed near gob side entry driving heading end, drill the gas bearing capacity measured with coal road tunnel contour line different distance coal body out of drill site to coal seam construction concordant, compared with the original gas bearing capacity in coal seam, judge away from tunnel 0~15m of contour line, whether 0~10m and 0 5m scope are caving in goaf causes within coal mass relief scope, so that it is determined that goaf Adjacent Working Face coal seam pressure relief scope.By the gas bearing capacity for determining normal distance coal seam samples different from goaf, goaf is investigated across backward Adjacent Working Face coal seam pressure relief scope, for instructing the pre- drilling design parameter for taking out coal roadway stripe coal-bed gas of concordant drilling and taking out coal seam scope in advance, drilling construction number and cost of drilling effectively are reduced.Its method is simple, and easy to operate, effect is good.
Description
Technical field
The present invention relates to gas control technology field, specifically a kind of buried depth that is applied to is less than 700m, coal seam
The underground goaf in the larger coal seam of solid coefficient is across falling the assay method to Adjacent Working Face coal seam pressure relief coverage.
Background technology
According to《Prevent and treat coal and gas prominent regulation》45th article of regulation：Region outburst prevention measures refer to it is projecting coal bed enter
Before row digging, to the projecting coal bed outburst prevention measures taken in a big way.Region outburst prevention measures include exploitation protective layer and take out coal in advance
The layer class of gas two.Taking out the adoptable mode of coal-bed gas in advance has：Surface well takes out coal-bed gas and underground layer-through drilling or suitable in advance
Layer drilling is pre- to take out section coal-bed gas, layer-through drilling and takes out coal roadway stripe coal-bed gas, concordant drilling or layer-through drilling in advance and draw 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, concordant drilling and take out coal road in advance in advance
Band coal-bed gas etc..
According to《Safety regulations in coal mine》210th article of regulation：Have the projecting coal bed of one of following condition, must not by
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 more than 500t/ times；
(3) coal seam solid coefficient is less than 0.3 in limit of mining；Or coal seam solid coefficient is 0.3~0.5, and
Buried depth is more than 500m's；Or coal seam solid coefficient is 0.5~0.8, and buried depth is more than 600m's；Or coal seam buried depth is more than
700m's；Or coal roadway stripe is located at exploitation area of stress concentration.
Therefore, the applicable elements of coal roadway stripe construction are：New well does not have the high gas layer of outburst hazard or in history
Coal seam of the intensity of outburst 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 more than 0.5, coal seam buried depth is less than 500m；When coal seam solid coefficient is more than 0.8,
Coal seam buried depth is less than 600m；Or coal seam buried depth is less than 700m.
According to《Prevent and treat coal and gas prominent regulation》49th article of regulation：Take the Yu Chou coal-bed gas area of various modes
During 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 whole exploitation block section, a range of coal seam of both sides stope drift active workings and its outside.It is required that outside drilling control stope drift active workings
The scope 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 both sides
At least each 15m outside contour line.Above-described drilling control range is the distance along aspect, as follows；
(2) layer-through drilling takes out the drilling of coal roadway stripe coal-bed gas region outburst prevention measures in advance should control whole piece coal seam lane
The a range of coal seam in road and its both sides.The scope is identical with the requirement in this Section 1 on the outside of stope drift active workings；
(3) concordant drilling or layer-through drilling draw back the drilling of exploiting field domain coal-bed gas region outburst prevention measures in advance to control
The coal seam of whole exploitation block section；
(4) layer-through drilling is taken out crossdrift (containing vertical, inclined shaft etc.) exposed coal regional coal-seam gas region outburst prevention measures and should taken off in advance
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 outward flange of control range to the minimum of tunnel contour line (contour line for including estimated front exposed coal section tunnel)
Distance is not less than 5m, and when drilling can not once penetrate coal seam thickness entirely, should keep coal hole minimum advance 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 scope is, away from tunnel outline method 0~15m of linear distance, to investigate goaf (stay and set 5-8 coal columns gob side entry driving) and be caving
Adjacent Working Face coal seam pressure relief scope is within away from tunnel 0~15m of outline method linear distance or in addition afterwards.
The content of the invention
Technical problem：The purpose of the present invention will overcome weak point of the prior art, and there is provided a kind of method is simple, operation
Conveniently, the coal mine gob Adjacent Working Face relief range assay method of drilling construction number and cost of drilling can be reduced.
Technical scheme：The coal mine gob Adjacent Working Face relief range assay method of the present invention, comprises the following steps：
A. after goaf is caving completely, width d is left and taken in goaf side1For 5~8m coal columns, in the opposite side coal of coal column
A width d is tunneled in layer2For 4~6m heading；
B. apart from coalhead C1For drill site of being constructed at 5~10m, from 3 are made a call in drill site into coal seam as release
The advanced concordant drilling in range test hole, 3 advanced collimation method linear distances of the concordant drilling away from tunnel profile are respectively L1、L2And L3,
The angle of 3 advanced concordant drillings and rib is 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 determined away from tunnel contour line respectively using direct method
Normal distance L1、L2And L3The gas bearing capacity of 3 measuring points corresponding to node；
D. by the contrast 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 situation of boundary of works area, so as to take corresponding gas control scheme.
3 described concordant advance boreholes it is advanced away from C2It is set to 20~60m.
Described drilling is away from tunnel outline method linear distance L1、L2、L3Respectively 5m, 10m, 15m, described 3 advanced concordants
Drilling and the angle β of rib1、β2、β3Respectively 11.3 °, 21.8 °, 31.0 °.
The determination relief range and concordant drilling construction scope have following 4 kinds of situations：
1) when drilling is away from tunnel outline method linear distance L1、L2And L3It is former that the gas bearing capacity surveyed at node is respectively less than coal seam
During 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 very well, the concordant mash gas pumping drilling of coal roadway tunneling is screened without construction；
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 L3Gas bearing capacity is surveyed at node equal to the original gas bearing capacity in coal seam, explanation is adopted
After dead zone is caving, preferably, relief range is in drilling away from tunnel outline method linear distance L for Adjacent Working Face release effect2Within, should
Region screens the concordant mash gas pumping drilling of coal roadway tunneling without construction；And in tunnel outline method linear distance L2-L3The coal in region
It must be constructed 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 L3Gas bearing capacity measuring point surveys gas bearing capacity equal to the original gas bearing capacity in coal seam, after illustrating that goaf is caving, adjacent work
Make face release effect relatively poor, relief range is apart from tunnel outline method linear distance L1Within, the region is suitable without constructing
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 L3Measuring point surveys gas bearing capacity and 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 shielding 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.
Beneficial effect：The present invention, across backwardness, reserves one fixed width coal column gob side entry driving to adjacent in coal mine gob
Working face coal seam pressure relief coverage is measured, by coalhead drill site to working face coal seam construct advance borehole,
Normal distance measuring point gas bearing capacities different apart from tunnel contour line are measured, then it is former with coal seam by comparing measuring point coal seam gas-bearing capacity
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 takes out coal in advance
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
Fall the release effect caused to periphery coal body, by drill site of being constructed near gob side entry driving heading end, applied in drill site to coal seam
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 scope away from tunnel 0~15m of contour line, 0~10m and 0-5m whether be caving in goaf cause coal mass relief scope with
It is interior, so that it is determined that goaf Adjacent Working Face coal seam pressure relief scope, instructs concordant drilling construction scope 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 use in new well
There is no the high gas layer of outburst hazard or do not occurred coal of the intensity of outburst less than 500t/ coal and gas prominent in history
Layer, and coal roadway stripe must not be located at exploitation area of stress concentration.When wherein coal seam solid coefficient is more than 0.5, coal seam buried depth
Less than 500m；When coal seam solid coefficient is more 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-face only need to determine a gob side entry driving Adjacent Working Face release model before coal roadway tunneling
Enclose, each circulation construction mash gas pumping drilling scheme is fixed during coal roadway tunneling, saves drilling, strong operability.
Brief description of the drawings
Fig. 1 is gob side entry driving Adjacent Working Face relief range drilling construction scheme schematic diagram of the invention；
Fig. 2-1 is the schematic diagram of concordant extraction borehole Construction State one of the invention；
Fig. 2-2 is the schematic diagram of concordant extraction borehole Construction State two of the invention；
Fig. 2-3 is the schematic diagram of concordant extraction borehole Construction State three of the invention；
Fig. 2-4 is the schematic diagram of concordant extraction borehole Construction State four of the invention.
Wherein：1- goafs；2- prearranged pillars；3- coalheads；4- coal seams；5- headings；6- drill sites；7- tunnels
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.
Embodiment
The present invention is further illustrated for embodiment in below in conjunction with the accompanying drawings：
As shown in figure 1, the coal mine gob Adjacent Working Face relief range assay method of the present 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,
It is advanced away from for 20~60m, drilling borehole bottom location 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, it is determined that being surveyed
Whether region is within the scope of the Adjacent Working Face coal seam pressure relief of goaf, so as 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 columns 2, in the opposite side of coal column 2
A width d is tunneled in coal seam2The heading 5 for being for 4~6m, highly 4~5m；
B. 3m × 3m × 3m drill sites 6 are being excavated at 5~10m before coalhead 3, is being applied out of 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 concordants drillings and the angle of rib are respectively β1、β2And β3, angle β1、β2、β3Point
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 nodes, surveyed respectively using direct method
Spacing tunnel outline method linear distance L1For 5m, L2For 10m, L3For 3 measuring points (#1 drilling gas contents corresponding to 15m nodes
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 gas bearing capacity of point 10) and the contrast of the original gas bearing capacity in coal seam, determine the situation of relief range and concordant drilling construction scope,
So as to take corresponding gas control scheme.
The determination relief range and concordant drilling construction scope 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 very well,
Without the concordant mash gas pumping drilling of construction shielding coal roadway tunneling；Concordant extraction borehole Construction State floor map is shown in accompanying 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 drillings 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, after illustrating that goaf is caving, and Adjacent Working Face release effect preferably, is unloaded
Press scope in drilling away from the normal distance L of tunnel contour line 72Within, i.e. within 10m, the region is without construction shielding coal roadway tunneling
Concordant mash gas pumping drilling；And in the normal distance L of tunnel contour line 72-L3It must construct and cover in the coal seam in (10-15m) region
Protect the concordant mash gas pumping drilling of coal roadway tunneling；Concordant extraction borehole Construction State floor map is shown in accompanying drawing 2-2, concordant drilling
Shielding coal roadway stripe range distance is met head on 20~60m of normal distance, i.e., each circulate and constructed to 20~60m scopes in front of working face
Concordant drills, and crossover distance is 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 is surveyed gas containing measuring point 10 and contained containing measuring point 9 and #3 drilling gas
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 tunnel contour line normal 7 apart from L1Within, i.e. within 5m, the region is without concordant drilling shielding coal roadway tunneling of constructing；And
Apart from tunnel contour line normal 7 apart from L1-L3The coal seam in (5-15m) region must construct concordant drilling shielding coal roadway tunneling；It is suitable
Layer drilling construction state plane schematic diagram is shown in accompanying drawing 2-3, concordant extraction borehole shielding coal roadway stripe range distance frontal method line-spacing
From 20~60m, i.e., each circulate to 20~60m scopes construction concordant drilling in front of working face, crossover distance is 5~10m, extraction
The whole pitch of holes of drilling 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 surveys gas bearing capacity containing measuring point 10 and is equal to the original gas bearing capacity in coal seam containing measuring point 9 and #3 drilling gas, says
After bright goaf is caving, Adjacent Working Face release poor effect, apart from tunnel contour line normal 7 apart from L3(0-15m) region
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 put down
Face schematic diagram is shown in accompanying drawing 2-4, and concordant drilling shielding coal roadway stripe range distance is met head on 20~60m of normal distance, i.e., each circulate
20~60m scopes construction concordant drilling in front of to working face, crossover distance is 5~10m, and extraction borehole end pitch of holes is 2~3m.
, it is necessary to carry out sealing of hole to drilling after the completion of the concordant extraction borehole construction, gas of being networked after the completion of drilling sealing
Extraction system, after extraction is up to standard can drilling shielding in the range of coal driving.
Claims (5)
1. a kind of coal mine gob Adjacent Working Face relief range assay method, it is characterised in that comprise the following steps：
A. after goaf is caving completely, width d is left and taken in goaf side1For 5~8m coal columns, in the opposite side coal seam of coal column
Tunnel a width d2For 4~6m heading；
B. apart from coalhead C1For drill site of being constructed at 5~10m, surveyed from making a call to 3 in drill site into coal seam as relief range
The advanced concordant drilling of examination, 3 advanced collimation method linear distances of the concordant drilling away from tunnel profile are respectively L1、L2And L3, 3 advanced
Concordant drills and the angle of rib is respectively β1、β2And β3；
C. when construction arrives advance borehole away from the outline method linear distance position of tunnel respectively for 3 advanced concordant drillings, take respectively
The normal distance L of tunnel profile1、L2And L3Drilling cuttings coal sample at node, is determined away from tunnel contour line normal respectively using direct method
Apart from L1、L2And L3The gas bearing capacity of 3 measuring points corresponding to node；
D. by the contrast 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 situation of scope, so as to take corresponding gas control scheme.
2. a kind of coal mine gob Adjacent Working Face relief range assay method according to claim 1, it is characterised in that：
3 described concordant advance boreholes it is advanced away from C2It is 20~60m.
3. a kind of coal mine gob Adjacent Working Face relief range assay method according to claim 1, it is characterised in that：
Described drilling is away from tunnel outline method linear distance L1、L2、L3Respectively 5m, 10m, 15m, described 3 advanced concordants drillings and coal
The angle β of wall1、β2、β3Respectively 11.3 °, 21.8 °, 31.0 °.
4. a kind of coal mine gob Adjacent Working Face relief range assay method according to claim 1, it is characterised in that：
The determination relief range and concordant drilling construction scope 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
During 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 very well, the concordant mash gas pumping drilling of coal roadway tunneling is screened without construction；
2) when drilling is away from tunnel outline method linear distance L1And L2The gas bearing capacity surveyed at node contains less than the original gas in coal seam
Amount, drills away from tunnel outline method linear distance L3Gas bearing capacity is surveyed at node equal to the original gas bearing capacity in coal seam, illustrates mined out
After area is caving, preferably, relief range is in drilling away from tunnel outline method linear distance L for Adjacent Working Face release effect2Within, the area
Domain screens the concordant mash gas pumping drilling of coal roadway tunneling without construction；And in tunnel outline method linear distance L2-L3The coal seam in region
The concordant mash gas pumping drilling of the interior shielding coal roadway tunneling that must construct；
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 L3Gas bearing capacity measuring point surveys gas bearing capacity 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, the region is bored without concordant of constructing
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
Lane is tunneled；
4) when being respectively L away from coal road tunnel outline method linear distance1、L2And L3Measuring point surveys gas bearing capacity, and to be 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 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.
5. the adjacent working face relief range assay method in a kind of coal mine gob according to claim 4, 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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| CN109578055A (en) * | 2018-11-21 | 2019-04-05 | 张登龙 | A kind of coal and CO2The control method of prominent accident |
| CN112392538A (en) * | 2020-11-18 | 2021-02-23 | 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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