CN103758560B - A kind of multiple topping packet zone mash gas harnessing method that goes forward one by one - Google Patents
A kind of multiple topping packet zone mash gas harnessing method that goes forward one by one Download PDFInfo
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Abstract
A kind of multiple topping packet zone mash gas harnessing method that goes forward one by one, is applicable to closely under high gas layer group condition, realizes the extinction of projecting coal bed region and safe working.According to the closely projecting coal bed group's occurrence characteristics of high methane; minable coal seam group is divided into upper coal seam group, Zu Hexia coal seam, middle coal seam group; and using middle coal seam group as crucial topping coal seam group; Zu Hexia coal seam, upper coal seam group is as protected seam coal seam group, and multiple going forward one by one protects Zu Hexia coal seam, the upper coal seam group of protected seam coal seam group.The mining sequence of three coal seam groups is: middle coal seam group, Zu Hexia coal seam, upper coal seam group.Each coal seam is exploited successively all from top to bottom in three groupings.Utilize the gas pressure relief of top, floor roadway layer-through drilling extraction protected seam, realize the object of three-dimensional mash gas extraction and region elimination outburst hazard, can be used for the gas control of the coal seam group with near interval comprising three or more coal seams.Its method is simple, and the duration is short, safe and efficient, with low cost.
Description
Technical field
The present invention relates to a kind of protective coat extracted and mash gas harnessing method, especially a kind of be applicable to closely high gas layer group condition under, realize the multiple topping packet zone mash gas harnessing method that goes forward one by one of the extinction of projecting coal bed region and safe working.
Background technology
Gas is one of principal element of serious threat Safety of Coal Mine Production, and in the Coal Accidents of China, more than 70% is gas accident.Current China pit mining presents that mining depth is large, complex geologic conditions, gas permeability of coal seam are low, gas pressure is high, gas bearing capacity takes out the features such as coal-bed gas difficulty greatly, in advance, add most of working seam belong to coal seam group with near interval compose deposit, by mining influence, upper and lower adjacent coal seam group, by a large amount of gas pressure relief of gushing out to goaf at short notice, will produce coal and gas prominent under certain condition.
In coal and gas prominent accident, exploitation dangerous seam with potential, is easier to when adjacent layer is coal seam or the high gas layer with outburst hazard up and down simultaneously occur.At present, the method for mining of closed distance coal seam group topping is generally select the method for multiple release from top to bottom, or using some for centre coal seams as crucial protective coat extracted.But; under coal seam group with near interval condition; gas flow field belongs to ball to flow field; can endlessly to mined bed or its goaf supply gas under methane pressure gradient effect; under effective reduction coal seam group condition, the outburst danger in single topping coal seam is more difficult, the dangerous existence as the same of coal and gas prominent.
Summary of the invention
Technical problem: the object of the invention is the deficiency overcome in prior art, provides a kind of simple, multiple topping packet zone mash gas harnessing method that goes forward one by one that the duration is short, safe and efficient and with low cost.
Technical scheme: the multiple topping packet zone mash gas harnessing method that goes forward one by one of the present invention, comprises the steps:
A. the basis closely projecting coal bed group's occurrence characteristics of high methane and " protective coat extracted technical specification ", minable coal seam is divided into three, upper, middle and lower coal seam group, in selection, coal seam group is as crucial topping coal seam group, Zu Hexia coal seam, upper coal seam group is as protected seam coal seam group, first coal seam group in exploitation, exploitation upper coal seam group again, finally exploitation lower coal seam group, each coal seam of each coal seam group is exploited all from top to bottom successively;
B. exploitation in coal seam group first coal seam before, the position of first last seat earth 15 ~ 25m of coal seam group in distance, construction group floor rock tunnel, driving one middle coal seam, with first middle coal direction construction many middle coal seam group layer-through drillings in fan-shaped distribution of rig in Nei Xiangzhong coal seam, group floor rock tunnel, middle coal seam group, middle coal seam group layer-through drilling through each coal seam of middle coal seam group, and penetrates the first seam roof 0.5m of middle coal seam group;
C. in distance, construct one and go up group floor rock tunnel, coal seam in the position of last seat earth 15 ~ 25m of coal seam group, with rig in group floor rock tunnel, upper coal seam upwards direction, the first coal seam construction of coal seam group in coal seam group layer-through drilling on many of fan-shaped distribution, upper coal seam group layer-through drilling through each coal seam of upper coal seam group, and penetrates the top board 0.5m of coal seam group;
D. under distance, construct group floor rock tunnel, a lower coal seam in the position of last seat earth 15 ~ 25m of coal seam group, with many lower coal seam group layer-through drillings of direction, first coal seam construction in fan-shaped distribution of rig downward coal seam group in group floor rock tunnel, lower coal seam, lower coal seam group layer-through drilling through each coal seam of lower coal seam group, and penetrates the top board 0.5m of lower coal seam group;
E. extraction pipe network is connected routinely, middle coal seam group layer-through drilling in group floor rock tunnel, centering coal seam carries out original gas pre-drainage and adopts, in the elimination of region after the first Coal Outburst danger of coal seam group, first the first coal seam of group, middle coal seam of crucial topping is exploited, and by the gas pressure relief in Zu Zhongge coal seam, coal seam in the middle coal seam group layer-through drilling extraction in group floor rock tunnel, middle coal seam;
F. each coal seam in the group of coal seam in exploiting in order, simultaneously by the gas pressure relief in the Zu Neige coal seam, upper coal seam of the upper coal seam group layer-through drilling extraction protected seam in group floor rock tunnel, upper coal seam; And by the gas pressure relief in the Zu Neige coal seam, lower coal seam of protected seam under the lower coal seam group layer-through drilling extraction in group floor rock tunnel, lower coal seam;
G. after the group back production of middle coal seam terminates, back production is carried out to each coal seam in the group of upper coal seam, then back production is carried out to each coal seam in the group of lower coal seam, back production is carried out simultaneously to each coal seam, gas pumping release is carried out to unquarried each coal seam.
In described upper coal seam group layer-through drilling, middle coal seam group layer-through drilling and lower coal seam group layer-through drilling, omnidistance steel sleeve of installing protects, and all stamps sieve aperture at steel sleeve through fragment position place, subterranean zone; Each coal seam group in the coal seam group of three, described upper, middle and lower includes 2-5 minable coal seam; In the group of each coal seam, in floor rock tunnel, the whole pitch of holes of each boring of construction is 25 ~ 35m; The floor rock tunnel height of constructing below the group of each coal seam is 3m, and wide is 4m.
Beneficial effect: owing to have employed such scheme, the coal seam group with near interval that the present invention is applicable to comprise three or more coal seams implements gas control, compared with prior art: the multiple protection of going forward one by one to protected coal seam group can be realized, effectively prevent adjacent coal seam group gas supply working seam gas amount, realize point source extraction and the three-dimensional extraction of associating of protected coal seam group; Middle coal seam group is considered as by existing protective coat extracted and gas pumping method basis overall as crucial topping; and group floor rock tunnel, combined layout coal seam and layer-through drilling; realize the multiple protection of going forward one by one to protected coal seam group; decrease stone head engineering quantity; improve gas pumping efficiency, realize that coal and non-coal is safe and efficient to be adopted altogether.Under being particularly useful for closely high gas layer group condition, the gas control of the multiple topping packet zone of going forward one by one of the extinction of projecting coal bed region and safe working can be realized.Its method is simple, and the duration is short, safe and efficient, with low cost, has practicality widely.
Accompanying drawing explanation
Fig. 1 is the multiple topping packet zone mash gas harnessing method schematic diagram that goes forward one by one of the present invention.
In figure: A-upper coal seam group; B-middle coal seam group; C-lower coal seam group; 1,2,3,4,5,6,7,8-coal seam; 9-upper group floor rock tunnel, coal seam; Group floor rock tunnel, 10-middle coal seam; Group floor rock tunnel, 11-lower coal seam; 12-upper coal seam group layer-through drilling; Group layer-through drilling in coal seam in 13-; Group layer-through drilling in coal seam under 14-.
Detailed description of the invention
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
The multiple topping packet zone mash gas harnessing method that goes forward one by one of the present invention, concrete steps are as follows:
A. the basis closely projecting coal bed group's occurrence characteristics of high methane and " protective coat extracted technical specification ", minable coal seam is divided into three, upper, middle and lower coal seam group, each coal seam group includes 2-5 minable coal seam, in selection, coal seam group B is as crucial topping coal seam group, upper coal seam group A and lower coal seam group C as protected seam coal seam group, first coal seam group B in exploitation, the upper coal seam group A of exploitation, the lower coal seam group C of finally exploitation, each coal seam of each coal seam group is exploited all from top to bottom successively;
B. exploitation in coal seam group B first coal seam before, the position of first last seat earth 15 ~ 25m of coal seam group B in distance, construction driving one is high is 3m, wide is the group floor rock tunnel, middle coal seam 10 of 4m, with rig direction, first coal seam construction many middle coal seam group layer-through drillings 13 in fan-shaped distribution to middle coal seam group B in group floor rock tunnel, middle coal seam 10, the whole pitch of holes of each boring is 25 ~ 35m, middle coal seam group layer-through drilling 13 through each coal seam of middle coal seam group B, and penetrates the first seam roof 0.5m of middle coal seam group B; In middle coal seam group layer-through drilling 13, omnidistance steel sleeve of installing protects, and all stamps sieve aperture at steel sleeve through fragment position place, subterranean zone;
C. in distance the position of last seat earth 15 ~ 25m of coal seam group A construct one high for 3m, wide is the group floor rock tunnel, upper coal seam 9 of 4m, with rig in group floor rock tunnel, upper coal seam 9 upwards direction, the first coal seam construction of coal seam group A in coal seam group layer-through drilling 12 on many of fan-shaped distribution, the whole pitch of holes of each boring is 25 ~ 35m, upper coal seam group layer-through drilling 12 through each coal seam of upper coal seam group A, and penetrates the first roof 0.5m of coal seam group A; In upper coal seam group layer-through drilling 12, omnidistance steel sleeve of installing protects, and all stamps sieve aperture at steel sleeve through fragment position place, subterranean zone;
D. under distance the position of last seat earth 15 ~ 25m of coal seam group C construct one high for 3m, wide is the group floor rock tunnel, lower coal seam 11 of 4m, with many lower coal seam group layer-through drillings 14 of direction, first coal seam construction in fan-shaped distribution of rig downward coal seam group C in group floor rock tunnel, lower coal seam 11, the whole pitch of holes of each boring is 25 ~ 35m, lower coal seam group layer-through drilling 14 through each coal seam of lower coal seam group C, and penetrates the first roof 0.5m of lower coal seam group C; In lower coal seam group layer-through drilling 14, omnidistance steel sleeve of installing protects, and all stamps sieve aperture at steel sleeve through fragment position place, subterranean zone;
E. extraction pipe network is connected routinely, middle coal seam group layer-through drilling 13 in group floor rock tunnel, centering coal seam 10 carries out original gas pre-drainage and adopts, region eliminate in coal seam group B first Coal Outburst danger after, first the first coal seam of the middle coal seam group B of crucial topping is exploited, and by the gas pressure relief in each coal seam in coal seam group B in middle coal seam group layer-through drilling 13 extraction in group floor rock tunnel, middle coal seam 10;
F. each coal seam in the group B of coal seam in exploiting in order, simultaneously by the gas pressure relief in each coal seam in the upper coal seam group A of the upper coal seam group layer-through drilling 12 extraction protected seam in group floor rock tunnel, upper coal seam 9; And by the gas pressure relief in each coal seam in the lower coal seam group C of protected seam under lower coal seam group layer-through drilling 14 extraction in group floor rock tunnel, lower coal seam 11;
G. after the group B back production of middle coal seam terminates, back production is carried out to each coal seam in upper coal seam group A, then back production is carried out to each coal seam in lower coal seam group C, back production is carried out simultaneously to each coal seam, gas pumping release is carried out to unquarried each coal seam.
As shown in Figure 1; to comprise the coal seam group with near interval in eight coal seams: eight coal seam group with near intervals to be divided into three, upper, middle and lower coal seam group; using middle coal seam group B as crucial topping coal seam group; and respectively upper coal seam group A, middle coal seam group B and group C bottom, lower coal seam construction floor rock tunnel combined optimization and arrange layer-through drilling; coal seam group B under coal seam group A on protected seam and protected seam is realized to go forward one by one protection and the multiple protective in coal seam in the group of coal seam; thus the danger of coal seam group with near interval coal and gas prominent is eliminated in region, concrete steps are as follows:
A. according to the closely projecting coal bed group's occurrence characteristics of high methane and topping guard space and effect, by minable coal seam people for being divided into upper coal seam group A, middle coal seam group B and lower coal seam group C, in selection, coal seam group B is as crucial topping, go forward one by one on the upper protected seam of protection coal seam group C under coal seam group A and lower protected seam, coal seam group mining order is middle coal seam group B, upper coal seam group A and lower coal seam group C, exploits each coal seam all from top to bottom in the group of coal seam;
B. exploitation in coal seam group B the first coal seam 4 before, in distance, the position construction driving height of the 3rd coal seam 6 base plate 15 ~ 25m of coal seam group B is 3m, wide is the group floor rock tunnel, middle coal seam 10 of 4m, in group floor rock tunnel, middle coal seam 10, coal seam group layer-through drilling 13 in utilizing rig to construct 90 ~ 100mm to first coal seam 5, coal seam 4, second of middle coal seam group B and the 3rd coal seam 6, middle coal seam group layer-through drilling 13 penetrates middle coal seam group B first coal seam 4 top board 0.5m, and the whole pitch of holes of middle coal seam group layer-through drilling 13 is 25 ~ 35m;
C. then in distance, the position construction driving height of the 3rd coal seam 3 base plate 15 ~ 25m of coal seam group A is 3m, wide is the group floor rock tunnel, upper coal seam 9 of 4m, in group floor rock tunnel, upper coal seam 9, upwards construct 90 ~ 100mm upper coal seam group layer-through drilling 12 in first coal seam 2, coal seam 1, second of coal seam group A and the 3rd coal seam 3 to utilize rig, upper coal seam group layer-through drilling 12 penetrates the first coal seam 1 top board 0.5m of coal seam group A, and the whole pitch of holes of upper coal seam group layer-through drilling 12 is 25 ~ 35m;
D. then under distance, the position construction driving height of the second coal seam 8 base plate 15 ~ 25m of coal seam group C is 3m, wide is the group floor rock tunnel, lower coal seam 11 of 4m, in group floor rock tunnel, lower coal seam 11, first coal seam 7 of the downward coal seam group C of rig and the second coal seam 8 is utilized to construct coal seam group layer-through drilling 14 under 90 ~ 100mm, lower coal seam group layer-through drilling 14 penetrates lower coal seam group C coal seam 7 top board 0.5m, the whole pitch of holes 25 ~ 35m of lower coal seam group layer-through drilling 14;
E. the middle coal seam layer-through drilling 13 in utilizing in group floor rock tunnel, coal seam 10 draws the original gas in coal seam group B first coal seam 4 in advance, region eliminate in coal seam group B first coal seam 4 outburst danger after, first first coal seam 4 of coal seam group B in crucial topping is exploited, the gas pressure relief in middle coal seam layer-through drilling 13 extraction in simultaneously utilizing in group floor rock tunnel, coal seam 10 in second coal seam 5 of coal seam group B and the 3rd coal seam 6;
F. each coal seam of coal seam group B in exploiting successively from top to bottom in order, utilize the upper coal seam group layer-through drilling 12 in upper group floor rock tunnel, coal seam 9 to go forward one by one in extraction on protected seam coal seam group the gas pressure relief in the first coal seam 2, coal seam 1, second and the 3rd coal seam 3 in the group A of coal seam simultaneously, and first coal seam 7 of lower coal seam group C of protected seam and the gas pressure relief in the second coal seam 8 under utilizing lower coal seam group layer-through drilling 14 extraction in lower group floor rock tunnel, coal seam 11;
G., after the group B back production of middle coal seam terminates, successively first coal seam 2, coal seam 1, second of coal seam group A and the 3rd coal seam 3 in back production, utilizes upper coal seam group layer-through drilling 12 extraction to unmind the gas pressure relief of protected coal seam simultaneously; First coal seam 7 and second coal seam 8 of coal seam group C under back production protected seam again, utilizes lower coal seam group layer-through drilling 14 extraction to unmind the gas pressure relief of protected coal seam simultaneously.
Claims (5)
1. the multiple topping packet zone mash gas harnessing method that goes forward one by one, is characterized in that, comprise the steps:
A. the basis closely projecting coal bed group's occurrence characteristics of high methane and " protective coat extracted technical specification ", minable coal seam is divided into three, upper, middle and lower coal seam group, in selection, coal seam group (B) is as crucial topping coal seam group, upper coal seam group (A) and lower coal seam group (C) are as protected seam coal seam group, first coal seam group (B) in exploitation, upper coal seam group (A) of exploitation again, lower coal seam group (C) of finally exploitation, each coal seam of each coal seam group is exploited all from top to bottom successively;
B. exploitation in coal seam group (B) first coal seam before, the position of first last seat earth 15 ~ 25m of coal seam group (B) in distance, middle group floor rock tunnel, the coal seam (10) of construction driving one, with many middle coal seams group layer-through drilling (13) of direction, first coal seam construction in fan-shaped distribution of rig coal seam group (B) in group floor rock tunnel (10) introversion of middle coal seam, middle coal seam group layer-through drilling (13) through each coal seam in middle coal seam group (B), and penetrates the first seam roof 0.5m in middle coal seam group (B);
C. in distance, construct one and go up group floor rock tunnel, coal seam (9) in the position of last seat earth 15 ~ 25m of coal seam group (A), with rig in upper group floor rock tunnel, coal seam (9) upwards direction, the first coal seam construction of coal seam group (A) in many of fan-shaped distribution upper coal seams group layer-through drilling (12), upper coal seam group layer-through drilling (12) through each coal seam in upper coal seam group (A), and penetrates the first seam roof 0.5m of coal seam group (A);
D. under distance, construct lower group floor rock tunnel, a coal seam (11) in the position of last seat earth 15 ~ 25m of coal seam group (C), with many lower coal seams group layer-through drilling (14) of direction, first coal seam construction in fan-shaped distribution in rig downward coal seam group (C) in lower group floor rock tunnel, coal seam (11), lower coal seam group layer-through drilling (14) through each coal seam in lower coal seam group (C), and penetrates the first seam roof 0.5m in lower coal seam group (C);
E. extraction pipe network is connected routinely, middle coal seam group layer-through drilling (13) in group floor rock tunnel, centering coal seam (10) is carried out original gas pre-drainage and is adopted, region eliminate in coal seam group (B) first Coal Outburst danger after, first the first coal seam in middle coal seam group (B) of crucial topping is exploited, and by the gas pressure relief in each coal seam in coal seam group (B) in middle coal seam group layer-through drilling (13) extraction in middle group floor rock tunnel, coal seam (10);
F. each coal seam in coal seam group (B) in exploiting in order, simultaneously by the gas pressure relief in each coal seam in upper coal seam group (A) of upper coal seam group layer-through drilling (12) the extraction protected seam in upper group floor rock tunnel, coal seam (9); And by the gas pressure relief in each coal seam in lower coal seam group (C) of protected seam under lower coal seam group layer-through drilling (14) extraction in lower group floor rock tunnel, coal seam (11);
G. after middle coal seam group (B) back production terminates, back production is carried out to each coal seam in upper coal seam group (A), then back production is carried out to each coal seam in lower coal seam group (C), back production is carried out simultaneously to each coal seam, gas pumping release is carried out to unquarried each coal seam.
2. the multiple topping packet zone mash gas harnessing method that goes forward one by one according to claim l; it is characterized in that: in described upper coal seam group layer-through drilling (12), middle coal seam group layer-through drilling (13) and lower coal seam group layer-through drilling (14), omnidistance steel sleeve of installing protects, and all stamps sieve aperture at steel sleeve through fragment position place, subterranean zone.
3. the multiple topping packet zone mash gas harnessing method that goes forward one by one according to claim l, is characterized in that: each coal seam group in the coal seam group of three, described upper, middle and lower includes 2-5 minable coal seam.
4. the multiple topping packet zone mash gas harnessing method that goes forward one by one according to claim l, is characterized in that: in the group of each coal seam, in floor rock tunnel, the whole pitch of holes of each boring of construction is 25 ~ 35m.
5. the multiple topping packet zone mash gas harnessing method that goes forward one by one according to claim l, is characterized in that: the floor rock tunnel height of constructing below the group of each coal seam is 3m, and wide is 4m.
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| CN104533511A (en) * | 2014-12-16 | 2015-04-22 | 中鼎国际工程有限责任公司 | Construction method for preventing and treating coal and gas outburst in coal roadway heading process |
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| CN108301866B (en) * | 2018-04-16 | 2019-05-07 | 中煤科工集团西安研究院有限公司 | Mining of closed distance coal seam group adjacent layer gas pressure relief directional drilling stops pumping method |
| CN111075502B (en) * | 2020-02-18 | 2021-03-19 | 太原理工大学 | Method for preventing coal mine water and gas spray holes |
| CN113586133A (en) * | 2021-09-08 | 2021-11-02 | 中煤科工集团重庆研究院有限公司 | Method for extracting pressure-relief gas from adjacent layer mined by upper protection layer of close-distance thin coal seam group |
| CN114278363A (en) * | 2021-12-21 | 2022-04-05 | 贵州盘江精煤股份有限公司 | Outburst prevention method for short-distance coal seam group area of middling coal group |
| CN115163023B (en) * | 2022-08-03 | 2023-11-07 | 中煤科工集团重庆研究院有限公司 | Close-range coal seam group gas combined efficient extraction method |
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