CN113446063A - Method for verifying fusion index region of close-range adjacent outburst coal seam - Google Patents
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- 239000003245 coal Substances 0.000 title claims abstract description 172
- 230000004927 fusion Effects 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000012795 verification Methods 0.000 claims abstract description 35
- 230000002265 prevention Effects 0.000 claims abstract description 27
- 238000012360 testing method Methods 0.000 claims abstract description 24
- 230000000694 effects Effects 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 238000005553 drilling Methods 0.000 claims description 21
- 238000003795 desorption Methods 0.000 claims description 16
- 238000005086 pumping Methods 0.000 claims description 13
- 238000007689 inspection Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 claims description 6
- 238000005065 mining Methods 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 4
- 230000008719 thickening Effects 0.000 claims description 4
- 239000011435 rock Substances 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000005520 cutting process Methods 0.000 description 17
- 239000010410 layer Substances 0.000 description 8
- 238000005259 measurement Methods 0.000 description 6
- 239000011229 interlayer Substances 0.000 description 5
- 238000009412 basement excavation Methods 0.000 description 3
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- 238000011160 research Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
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Abstract
The invention relates to a method for verifying a fusion index region of a close-range adjacent outburst coal seam, which belongs to the technical field of coal mine safety and mainly aims at performing region outburst prevention measure effect verification on the close-range adjacent outburst coal seam with the normal distance less than 5m and the average thickness more than 0.3m and above when the close-range outburst coal seam is mined, arranging measuring points in a key region where the coal seam is thickened and a geological structure occurs, and performing region verification on fusion indexes of the measuring region and a working face. The implementation steps comprise: advanced detection, fusion index test, critical value determination and comprehensive danger judgment. The invention improves the working efficiency of verification of the adjacent outburst coal seam area, improves the operation progress of the excavating working surface of the outburst coal seam, realizes safe and efficient production of the excavating working surface of the outburst coal seam, provides a basis for verification of the adjacent outburst coal seam area under similar occurrence conditions, and provides ideas and scientific practical experience for making relevant industry standard terms for verification of the adjacent outburst coal seam area in a close range.
Description
Technical Field
The invention belongs to the technical field of coal mine safety, and relates to a method for verifying a fusion index region of a close-range adjacent outburst coal seam.
Background
In short pay outburst mining systems, each coal seam is a source of outburst hazards. With the continuous progress of outburst prevention technology and system, China has formed two 'four-in-one' comprehensive outburst prevention measure treatment programs. The regional verification is the last link of regional 'four-in-one' comprehensive outburst prevention measures and is an important level for controlling and preventing coal and gas outburst accidents. In China, in the actual production, most of regional verification of the coal seam is carried out by adopting a drilling cutting index method, namely, the outburst danger of the coal body in front of the working face is comprehensively determined by measuring a drilling cutting gas desorption index and a drilling cutting amount index.
The drilling cutting index method becomes a relatively mature and perfect area verification technology after continuous research for many years, is mainly used for area verification, working face prediction or working face outburst prevention measure effect inspection of outburst coal seam coal roadway tunneling working faces and stoping working faces, and plays an extremely important role in outburst mine safety production. However, the drill cutting index method is still limited when being used for verifying the index or method in the area close to the outburst coal seam, and the method is mainly characterized in that: current national regulations and standards do not specify whether or how regional verification is to be performed for adjacent outburst coal seams with a normal distance of less than 5 m. And (II) verifying that the drilling engineering quantity is large and the working efficiency is low for the adjacent outburst coal seam area with the normal distance less than 5m, and the outburst risk of the coal seam cannot be truly reflected because the coal sample contains a large amount of gangue.
Therefore, the research on the verification method of the close-range adjacent outburst coal seam area is developed, the efficient and safe verification method of the close-range adjacent outburst area is provided, coal and gas outburst accidents are effectively prevented, the production efficiency of the close-range outburst coal seam group excavation working face is improved, and meanwhile, the important significance is achieved in seeking ideas for the establishment of industry specifications.
Disclosure of Invention
In view of this, an object of the present application is to provide a method for verifying a fusion index region of a close-range adjacent outburst coal seam, so as to improve the verification efficiency of the region of the adjacent outburst coal seam.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for verifying a fusion index area of a close-distance adjacent outburst coal seam comprises the following steps:
a. advanced detection:
when the outburst prevention measures of the pre-pumping coal seam gas area are executed on the mining coal seams of the outburst coal seam group, the area pre-pumping outburst prevention measures are executed on the adjacent outburst coal seams; finding out key areas with the interval less than 5m away from the coal bed, the thickening of the coal bed and the occurrence of geological structures by utilizing the condition that the coal rock is seen by the cross-layer pre-drainage drill hole, and drawing a diagram highlighting the interval of the coal bed groups and the occurrence of the geological structures;
b. and (3) fusion index testing:
analyzing and determining the reliability of the effect inspection index of the outburst coal seam region pre-pumping measures and the sensitivity of the prediction index of the working face, and selecting a reasonable outburst coal seam region and working face fusion index; when the regional measure effect of the outburst coal seam is tested, measuring points are arranged on the adjacent outburst coal seam with the normal distance less than 5m and the average thickness more than 0.3m and above from the coal seam, the fusion index of the region and the working surface is measured, and the regional measure effect is tested;
c. critical value determination:
collecting the forecast historical data of the outburst coal layer area and the working face, testing the gas desorption rule of the outburst coal layer area and the working face in a laboratory by using the collected coal sample, and analyzing and determining the critical values of the indexes of the area and the working face;
d. and (4) comprehensive judgment of danger:
comparing the area index and the working face index in the measured fusion index with a critical value respectively, and judging that the outburst prevention measure of the area adjacent to the outburst coal seam is effective and the area is verified to be a working face without outburst danger when the fusion indexes are smaller than the critical value and the verification process has no dynamic phenomena of spray holes and top drilling; otherwise, the outburst prevention measures of the areas adjacent to the outburst coal seam are invalid, the areas are verified to be outburst dangerous working faces, and the area outburst prevention measures are continuously executed.
Optionally, the fusion index measuring points are arranged in a key area which is less than 5m away from the coal seam, thickened and formed in a geological structure.
Optionally, the arrangement of the coal roadway strip adjacent to the outburst coal seam fusion indicator test drilling holes requires that at least 2 test points are arranged at intervals of 30m along the coal roadway strip.
Optionally, the arrangement of the stope face adjacent to the outburst coal seam fusion index testing drill holes requires that when the stope area does not exceed 120m, the drill holes are arranged to arrange at least 2 test points every 30m in the advancing direction of the stope face, otherwise, at least 3 test points are arranged every 30 m.
The invention has the beneficial effects that: the method has the advantages that the effect inspection and the area verification of measures of the adjacent outburst coal seam area are realized simultaneously, compared with the traditional drill cutting index method adopted during the coal seam area verification, the key problems that the area verification drilling work amount is large, the working efficiency is low, the outburst danger of the coal seam cannot be truly reflected due to the fact that a coal sample contains a large amount of gangue and the like are solved, the working efficiency of the verification of the adjacent outburst coal seam area is improved, the working progress of the outburst coal seam excavation working face is improved, and the safe and efficient production of the outburst coal seam excavation working face can be realized.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of coal seam interval and occurrence of geological structures;
fig. 2 is a schematic diagram of arrangement of verification drill holes in a fusion index area of an adjacent outburst coal seam of a mining working face, wherein fig. 2a is a schematic diagram of arrangement of verification drill holes in a fusion index area of an adjacent outburst coal seam of a stope working face, and fig. 2b is a schematic diagram of arrangement of verification drill holes in a fusion index area of an adjacent outburst coal seam of a heading working face.
Detailed Description
Referring to fig. 1-2, a short-distance adjacent outburst coal seam fusion index region verification method aims at the mining characteristics of typical short-distance outburst coal seam groups, and provides a region and working face index fusion advanced verification region verification method by taking advanced detection, fusion index testing, critical value determination and comprehensive danger judgment as general ideas of how to perform region verification on adjacent outburst coal seams with the interval of the outburst coal seams being less than 5m and the average thickness being more than 0.3m and above. The method for verifying the fusion index area of the close-range adjacent outburst coal seam comprises the following steps:
a. advanced detection
When the outburst prevention measures of the gas area of the pre-pumping coal seam are executed on the mining coal seams of the outburst coal seam group, the gas area pre-pumping outburst prevention measures are executed on the adjacent outburst coal seams, the condition that the coal rock is seen by the cross-layer pre-pumping drilling holes is utilized, key areas with the distance being less than 5m away from the coal seam layer, the coal seam thickening, the occurrence of geological structures and the like are found out, and the interval of the outburst coal seam group and the occurrence of the geological structures are drawn.
b. Fusion index testing
And analyzing and determining by combining the reliability of the effect inspection indexes of the pre-pumping measures of the outburst coal seam area and the sensitivity of the prediction indexes of the working face, and selecting reasonable fusion indexes of the outburst coal seam area and the working face.
When the regional measure effect of the outburst coal seam is tested, the fusion indexes of the measuring point measuring region and the working face are arranged for the adjacent outburst coal seam with the average thickness of more than 0.3m and more than 5m away from the coal seam in the region with small interlayer spacing, thickened coal seam and complex geological structure, and the regional measure effect is tested.
The coal roadway strip adjacent outburst coal seam fusion index testing drilling arrangement requirement is as follows: at least 2 test points are arranged along the coal roadway strip at intervals of 30 m.
The method comprises the following steps of (1) testing the drilling arrangement requirement of fusion indexes of adjacent outburst coal seams of a stope face: when the stoping area does not exceed 120m, arranging at least 2 inspection test points at intervals of 30m along the advancing direction of the coal face by the drilling arrangement; otherwise, at least 3 test points should be arranged at intervals of 30m in the direction of coal face advance.
c. Threshold determination
And collecting the forecast historical data of the outburst coal layer area and the working face, testing the gas desorption rule of the outburst coal layer area and the working face in a laboratory by adopting a coal sample, and analyzing and determining the critical values of the indexes of the area and the working face.
d. Comprehensive judgment of danger
Comparing the area index and the working face index in the measured fusion index with the critical value respectively, judging that the outburst prevention measure of the adjacent outburst coal seam area is effective when the fusion index is smaller than the critical value and the verification process has no dynamic phenomena such as spray holes, top drilling and the like, and verifying the area as the outburst prevention working face without outburst danger, otherwise, the outburst prevention measure of the adjacent outburst coal seam area is ineffective, verifying the area as the outburst prevention working face, and continuing to execute the area outburst prevention measure.
The method can realize the effect inspection and the area verification of the measure of the adjacent outburst coal seam area at the same time, compared with the traditional drill chip index method adopted during the area verification according to the coal seam area, the method solves the key problems that the area verification drilling work amount is large, the working efficiency is low, the outburst danger of the coal seam cannot be truly reflected due to the fact that a coal sample contains a large amount of gangue, the work efficiency of the verification of the adjacent outburst coal seam area is improved, the operation progress of the excavating working surface of the outburst coal seam is improved, and the safe and efficient production of the excavating working surface of the outburst coal seam can be realized.
Examples
16 from a certain ore in GuizhouInThe area of the outer section (450-660 m) of the 14 working face is an engineering background, and the working face edge 6InCoal seam trend is advanced and covered 6On the upper partThe coal seam interlayer spacing is 2.1-2.4 m, and the average is 2.2 m; the coal thickness is 0.52 to 1.14m, and the average thickness is 0.78 m. 6Lower partCoal layer spacing, 6InThe coal seam interlayer spacing is 3.9-5.8 m, and the average is 4.7 m; the thickness of the coal seam is 0.64-1.23 m, and the average thickness is 0.96 m. For 16In14, performing regional verification on the adjacent outburst coal seam before stoping according to the method disclosed by the invention, wherein the specific implementation comprises the following steps:
a. advanced detection
By 16In14 working face gas extraction middle lane and 16InAnd (3) analyzing the occurrence conditions of the short-distance outburst coal seam groups according to the construction conditions of the area pre-pumping measure drilling of the 14-bottom pumping roadway construction, and searching key areas with the interlayer spacing smaller than 5m, coal seam thickening, geological structure occurrence and the like. 16InThe coal seam interval and geological structure occurrence conditions of the 14 working surface outer sections (450-660 m) are shown in figure 1.
b. Fusion index testing
Analyzing related indexes of 'prevention and control of coal and gas outburst rules' and indexes of areas and working faces adopted by mines, and adopting residual gas content and drill cuttings gas desorption index K1The values are used as a verification index and a working face fusion index of the adjacent outburst coal seam area respectively.
Based on advanced geological exploration, at 16InThe regions of small interlayer spacing, thickened coal seam, geological structure zone and the like grasped by the outer section (450-660 m) of 14 working surfaces are in pair 6InWhen the coal seam is tested for the effect of the regional outburst prevention measure, 6 is measured at the same timeOn the upper part、6Lower partResidual gas content W of coal seam and drill cuttings gas desorption index K1Values for each of 21 groups, measurement results: 6On the upper partThe residual gas content W of the coal seam is 3.66-6.71 m3Between/t, gas desorption index K for drill cuttings1The value is 0.14 to 0.31ml/g.min1/2；6Lower partThe residual gas content W of the coal bed is 3.17-5.47 m3Between/t, gas desorption index K for drill cuttings1The value is 0.13 to 0.35ml/g.min1/2。
c. Fusion index critical value
Mine 6On the upper part、6In、6Lower partThe coal bed is made of high-metamorphic anthracite, and the critical value of the residual gas content in the effect of the regional outburst prevention measure adopts 8m recommended by the outburst prevention detailed rules3And/t, the critical value is proved to be safe and reliable in practice. Therefore, the critical value of the residual gas content of the regional fusion index is selected to be 8m3/t。
For the working face index K1The value threshold determinations were determined using laboratory studies and field survey analysis. Run-time Collection 6On the upper part、6Lower partCoal bed coal sample determination K1-P is as shown in formula (1) and formula (2); and combines Langmuir adsorption theory to establish W-K1The relational model is expressed by the following equations (3) and (4).
6On the upper partCoal seam: k1＝0.7704P0.7706；R2＝0.9902 (1)
6Lower partCoal seam: k1＝0.8176P0.7275；R2＝0.9932 (2)
In the formula: k1Drill cuttings gas desorption index, ml/g.min1/2；
P is coal bed gas pressure, MPa;
w-coal bed gas content, m3/t；
a. b-coal bed gas adsorption constant;
Mad-coal seam moisture;
Ad-coal bed ash.
Obtained by laboratory test and data fitting calculation, and the gas content is measured in a laboratory to be 8m3At/t, 6On the upper part、6Lower partGas desorption index K of drilling cuttings of coal bed1The critical values are respectively 0.51ml/g.min1/2And 0.53ml/g.min1/2。
At 16In11 run (K0+ 360-750 m) effect inspection period tracking and inspecting 6On the upper part、6Lower partResidual gas content W of coal bed and drill chip desorption index K1Set of values 27, data fitting 6On the upper part、6Lower partCoal bed to obtain W-K1The fitting relationship of (a) is shown in the formulas (5) and (6).
6On the upper partCoal seam: W12.969K1 0.6993；R2＝0.9321 (5)
6Lower partCoal seam: W12.246K1 0.6082；R2＝0.9572 (6)
According to the formulas (5) and (6), the calculation result is 6On the upper part、6Lower partResidual gas content of coal bed is 8m3At/t, its drill cuttings desorption meansMark K1The values are all 0.5ml/g.min1/2。
Therefore, the minimum value of laboratory test and field actual measurement calculation is selected as 6 according to the working surface index drilling cutting gas desorption index critical value for verifying the adjacent outburst coal seam areaOn the upper part、6Lower partVerification index K in coal seam area1The threshold value of the value, i.e. the final selection, is 0.5ml/g.min1/2。
d. Comprehensive judgment of danger
Small house coal mine 6InCoal seam face to adjacent 6On the upper part、6Lower partVerification of the protruding coal seam area 6On the upper partThe measurement result of the residual gas content W of the coal seam is 3.66-6.71 m3Between/t, gas desorption index K for drill cuttings1The value measurement result is 0.14 to 0.31ml/g.min1/2；6Lower partThe measurement result of the residual gas content W of the coal seam is 3.17-5.47 m3Between/t, gas desorption index K for drill cuttings1The value measurement result is 0.13-0.35 ml/g.min1/2。6On the upper part、6Lower partResidual gas content and drill cutting gas desorption index K for coal bed determination1The value fusion indexes are all less than the critical value of 8m3/t、0.50ml/g.min1/2And verifying that no dynamic phenomena such as spray holes, top drilling and the like exist in the drilling construction process, judging 6On the upper part、6Lower partThe outburst prevention measures of the coal seam pre-pumping area are effective, and the area is verified to be a working surface without outburst danger.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (4)
1. A method for verifying a fusion index area of a close-range adjacent outburst coal seam is characterized by comprising the following steps:
a. advanced detection:
when the outburst prevention measures of the pre-pumping coal seam gas area are executed on the mining coal seams of the outburst coal seam group, the area pre-pumping outburst prevention measures are executed on the adjacent outburst coal seams; finding out key areas with the interval less than 5m away from the coal bed, the thickening of the coal bed and the occurrence of geological structures by utilizing the condition that the coal rock is seen by the cross-layer pre-drainage drill hole, and drawing a diagram highlighting the interval of the coal bed groups and the occurrence of the geological structures;
b. and (3) fusion index testing:
analyzing and determining the reliability of the effect inspection index of the outburst coal seam region pre-pumping measures and the sensitivity of the prediction index of the working face, and selecting a reasonable outburst coal seam region and working face fusion index; when the regional measure effect of the outburst coal seam is tested, measuring points are arranged on the adjacent outburst coal seam with the normal distance less than 5m and the average thickness more than 0.3m and above from the coal seam, the fusion index of the region and the working surface is measured, and the regional measure effect is tested;
c. critical value determination:
collecting the forecast historical data of the outburst coal layer area and the working face, testing the gas desorption rule of the outburst coal layer area and the working face in a laboratory by using the collected coal sample, and analyzing and determining the critical values of the indexes of the area and the working face;
d. and (4) comprehensive judgment of danger:
comparing the area index and the working face index in the measured fusion index with a critical value respectively, and judging that the outburst prevention measure of the area adjacent to the outburst coal seam is effective and the area is verified to be a working face without outburst danger when the fusion indexes are smaller than the critical value and the verification process has no dynamic phenomena of spray holes and top drilling; otherwise, the outburst prevention measures of the areas adjacent to the outburst coal seam are invalid, the areas are verified to be outburst dangerous working faces, and the area outburst prevention measures are continuously executed.
2. The method for verifying the fusion index area of the close-range adjacent outburst coal seam according to claim 1, wherein the method comprises the following steps: the fusion index measuring points are arranged in a key area which is less than 5m away from the coal seam layer spacing, thickened and formed in a geological structure.
3. The method for verifying the fusion index area of the close-range adjacent outburst coal seam according to claim 1, wherein the method comprises the following steps: the arrangement of the coal roadway strip adjacent to the outburst coal seam fusion index test drilling hole requires that at least 2 test points are arranged at intervals of 30m along the coal roadway strip.
4. The method for verifying the fusion index area of the close-range adjacent outburst coal seam according to claim 1, wherein the method comprises the following steps: the arrangement requirement of the fusion index test drill holes of the adjacent outburst coal seam of the stoping face is that when the stoping area does not exceed 120m, the drill holes are arranged to be at least 2 test points at intervals of 30m along the advancing direction of the coal face, otherwise, at least 3 test points are arranged at intervals of 30 m.
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