CN105675815A - Method for measuring widths of tunnel gas pre-discharge zone of coal mine working face - Google Patents
Method for measuring widths of tunnel gas pre-discharge zone of coal mine working face Download PDFInfo
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- CN105675815A CN105675815A CN201610046621.2A CN201610046621A CN105675815A CN 105675815 A CN105675815 A CN 105675815A CN 201610046621 A CN201610046621 A CN 201610046621A CN 105675815 A CN105675815 A CN 105675815A
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- 239000003245 coal Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000004568 cement Substances 0.000 claims abstract description 4
- 238000002347 injection Methods 0.000 claims description 71
- 239000007924 injection Substances 0.000 claims description 71
- 238000005553 drilling Methods 0.000 claims description 12
- 230000000903 blocking effect Effects 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 4
- 238000005065 mining Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000009792 diffusion process Methods 0.000 abstract description 2
- 239000000700 radioactive tracer Substances 0.000 abstract 2
- 238000005086 pumping Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
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Abstract
The invention relates to a method for measuring the widths of the tunnel gas pre-discharge zone of a coal mine working face.The method is characterized in that in a mining-area tunnel closest to the working face, 5 gas injecting holes are constructed starting from a position 10m away from a crossheading entrance, the depths of the holes are respectively 40m, 35m, 25m and 20m, and cement is injected into the holes to seal the same; tracer gas SF6 is injected into the gas injecting holes, measuring is continuously performed for 300 days at the 5 testing points through SF6 testers, and the widths of the tunnel gas pre-discharge zone of the coal seam of a coal mine at different tunnel exposure time are obtained according to the relation graph of measured data.The method has the advantages that the blank of the method for measuring the widths of the tunnel gas pre-discharge zones of different coal mines at different coal seam tunnel exposure time is filled up, the features of stable diffusion and easiness in capture of the tracer gas SF6 are utilized, the widths of the coal seam tunnel gas pre-discharge zone are measured accurately while the normal production of the coal mine is unaffected, the method is simple to operate, low in cost, capable of measuring the widths by the technical capacity of the coal mine, and quite good in economical efficiency and universality.
Description
Technical field
The present invention relates to stope working surface of coal mines Forecast of Gas Emission field, be specifically related to the assay method of the pre-gas-removing bandwidth of support in gateway of coal mining face.
Background technology
Stope working surface of coal mines gas preventing and control technology comprises Forecast of Gas Emission and two aspects of gas pumping, only judges gas separate sources and quantity by Forecast of Gas Emission, could effectively instruct gas pumping. Stope working surface of coal mines main gas source in process of production has: this coal seam, adjacent layer and country rock, wherein this coal-bed gas is the main source of impact safety in production. Colliery must carry out this Prediction of Gas Outflow from Coal Seams at Great before developing exploitation, thus carrying out pointed gas pumping measure.
China's coal mines adopts national regulation " coal mine gas prediction of gas emission specification " (AQ1018-2006) to carry out Forecast of Gas Emission, the original gas bearing capacity (W in code requirement known work face0), gas remaining quantity (Wc), coal seam thickness (M) and working thickness (m), face length (L), span length (b) and pre-gas-removing bandwidth (h) in tunnel can draw this gas flowing in coal layer, but above-mentioned underlying parameter is provide in the way of different ature of coal estimated values except the pre-gas-removing bandwidth in tunnel, and other parameters all can draw in down-hole practical measurement determines value. China's coal mines distribution is extensive, and coal coal-forming and occurrence condition diversity are very big, owing to not having method directly to measure this parameter, different ature of coal can only be adopted to estimate the pre-gas-removing bandwidth in tunnel, thus causing that this Prediction of Gas Outflow from Coal Seams at Great value error is bigger.
Colliery should in conjunction with this ore deposit condition of coal seam occurrence, it is necessary to a kind of pre-gas-removing bandwidth of method this heading of Accurate Determining provides reliable basis for gas pumping, thus ensureing personnel and property safety in process of production.
Summary of the invention
The purpose of the present invention, is to provide a kind of method measuring the pre-gas-removing bandwidth in stope working surface of coal mines tunnel, can ensure that when not affecting mine normal operation, the pre-gas-removing bandwidth value of Accurate Determining heading.
The technical scheme is that
A kind of method measuring the pre-gas-removing bandwidth in stope working surface of coal mines tunnel, comprises the steps:
1) when mine district roadway opening to planning stope, in the mining roadway near planning stope, distance crossheading porch, the planning face every spacing 1m in 10m position constructs out gas injection boring, the first gas injection boring of constructing out altogether, the second gas injection boring, the 3rd gas injection boring, the 4th gas injection boring and the 5th gas injection boring.
2) gas injection boring being carried out sealing of hole, the 5th gas injection drilling depth 40m, cementing filled section length is 39m, notes search gas SF6Section 11 length are 1m; 4th gas injection drilling depth 35m, cementing filled section 10 length is 34m, notes search gas SF6Section 11 length are 1m; 3rd gas injection drilling depth 30m, cementing filled section 10 length is 29m, notes search gas SF6Section 11 length are 1m; Second gas injection drilling depth 25m, cementing filled section 10 length is 24m, notes search gas SF6Section 11 length are 1m; First gas injection drilling depth 20m, cementing filled section 10 length is 19m, notes search gas SF6Section 11 length are 1m.
3) search gas SF is injected to gas injection in holing6, first open the gas injection valve being connected with air injection pipe, then open the control valve of gas injection steel cylinder observed pressure table, after force value is stable, first closing control valve after closedown gas injection valve.
4) planning face crossheading normal driving by entrance, when driving is to the first test point, the second test point, the 3rd test point, the 4th test point and five test points, the gas skirt of 1m × 1m is set respectively on the rib of each test point tunnel, preserves case and test valve.
5) search gas SF is carried out in the first test point, the second test point, the 3rd test point, the 4th test point and the 5th test point every day6Concentration measures, and opens test valve SF6Tester 26 measures, and measures and closes examination valve after terminating.
6) METHOD FOR CONTINUOUS DETERMINATION 300 days, and SF will be measured6Concentration (%) and minute (my god) data draw graph of a relation, thus drawing this pre-gas-removing bandwidth in open-assembly time tunnel, difference tunnel, coal seam of this colliery.
In step 1), in planning stope, construction concordant gas injection boring, should avoid structural belt as far as possible, and gas injection dip angle of hole is identical with ocurrence of coal seam direction, and azimuth is vertical working direction.
In step 2) in, cementing filled section arranges a blocking foremost with aperture place, it is prevented that cement flows into note search gas SF6Section.
In step 3), carry out note search gas SF after 24 hours at cementing6, observed pressure table closes gas injection valve after stablizing 1 minute.
In step 4), gas skirt 23 is set at once after development machine is advanced over test point, preserves case and test valve, carry out search gas SF on the same day subsequently6Concentration measures and time record.
In step 5), each test point is at test search gas SF6Before concentration, adjustment answered by tester.
In step 6), by observe search gas SF6 concentration (%) and minute (my god) graph of a relation, just intuitively can demonstrate the pre-gas-removing bandwidth value in tunnel of rib difference open-assembly time really.
The invention has the beneficial effects as follows: make up the blank measuring the pre-gas-removing bandwidth method in different open-assembly time tunnels, mine different coal tunnel, utilize search gas SF6Stable diffusion and the feature easily caught, and can guarantee that when not affecting mine normal production, and the pre-gas-removing bandwidth value of Accurate Determining heading, the method operation is simple and easy and with low cost, colliery self-technique ability just can measure, and has extraordinary economy and popularization.
Accompanying drawing explanation
Fig. 1 is stope search gas gas injection boring of the present invention and test point horizontal layout schematic diagram;
Fig. 2 is gas injection boring of the present invention and gas injection device structural representation;
Fig. 3 is that search gas of the present invention preserves and test apparatus structure schematic diagram.
Detailed description of the invention
Embodiment one
A kind of method measuring the pre-gas-removing bandwidth in stope working surface of coal mines tunnel, comprises the steps:
One, gas injection bore position is demarcated
Select at the mining roadway 2 near planning stope 1 as gas injection drilling construction place, labelling planning face crossheading entrance 4, with the entrance 4 of planning face crossheading 3 for starting point, the first gas injection boring 9 is demarcated along roadway direction spacing 10m place, mine district, then every one the gas injection boring of 1m location position, i.e. the second gas injection boring the 8, the 3rd gas injection boring the 7, the 4th gas injection boring the 6, the 5th gas injection boring 5, totally 5 gas injection boring.
Two, cementing and sealing of hole in boring, hole:
Ordi-nary drilling machine is adopted to construct gas injection boring of this coal seam, construction drill inclination angle is consistent with seam inclination is 5 °, azimuth is vertical and rib, length is the first gas injection boring 9 respectively is 40m, second gas injection boring 8 is 35m, 3rd gas injection boring 7 is 30m, and the 4th gas injection boring 6 is 25m, and the 5th gas injection boring 5 is 20m. After gas injection boring of having constructed, in holing to each gas injection, install 1 blocking 17 from 1m place at the bottom of hole, in installing blocking 17 processes, install air injection pipe 18 simultaneously, inject cement with in backward each gas injection boring, after filling, install 1 blocking 17 at orifice position.
Three, note search gas SF6And determine pre-gas-removing bandwidth:
After completing gas injection boring cementing filled section 24 hours, first open the gas injection valve 20 being connected with air injection pipe 18, then the control valve 22 of gas injection steel cylinder 21 is opened, and observed pressure table 19, after force value stablizes 1 minute, inject SF6 in holing to gas injection, then first close closing control valve 22 after gas injection valve 20, repeat above method and inject search gas SF in 5 gas injections borings6。
After completing 5 gas injection boring injection search gass, according to colliery digging planning time, normally tunnel at planning stope crossheading entrance 4 place, when driving is to, when surveying first pilot the 12, second test point the 13, the 3rd test point the 14, the 4th test point 15 and five test points 16, arranging the gas skirt 23 of 1m × 1m respectively, preserve case 24 and test valve 25 on the rib of each test point tunnel.
In first test point the 12, second test point the 13, the 3rd test point the 14, the 4th test point 15 and continuous 300 days of the 5th test point 16, every day carries out search gas SF6Concentration measures, and opens test valve 25 and uses SF6Tester 26 measures, and measures and closes test valve 25 after terminating. According to SF after test terminates6Concentration (%) and minute (my god) data draw graph of a relation, thus accurately drawing this pre-gas-removing bandwidth in open-assembly time tunnel, difference tunnel, coal seam of this colliery.
Claims (2)
1. the method measuring the pre-gas-removing bandwidth in stope working surface of coal mines tunnel, it is characterised in that comprise the steps:
1) when mine district roadway opening to planning stope, in the mining roadway near planning stope, distance crossheading porch, the planning face every spacing 1m in 10m position constructs out gas injection boring, the first gas injection boring of constructing out altogether, the second gas injection boring, the 3rd gas injection boring, the 4th gas injection boring and the 5th gas injection boring;
2) gas injection boring being carried out sealing of hole, the 5th gas injection drilling depth 40m, cementing filled section length is 39m, notes search gas SF6Section 11 length are 1m;4th gas injection drilling depth 35m, cementing filled section 10 length is 34m, notes search gas SF6Section 11 length are 1m; 3rd gas injection drilling depth 30m, cementing filled section 10 length is 29m, notes search gas SF6Section 11 length are 1m; Second gas injection drilling depth 25m, cementing filled section 10 length is 24m, notes search gas SF6Section 11 length are 1m; First gas injection drilling depth 20m, cementing filled section 10 length is 19m, notes search gas SF6Section 11 length are 1m;
3) search gas SF is injected to gas injection in holing6, first open the gas injection valve being connected with air injection pipe, then open the control valve of gas injection steel cylinder observed pressure table, after force value is stable, first closing control valve after closedown gas injection valve;
4) planning face crossheading normal driving by entrance, when driving is to the first test point, the second test point, the 3rd test point, the 4th test point and five test points, the gas skirt of 1m × 1m is set respectively on the rib of each test point tunnel, preserves case and test valve;
5) search gas SF is carried out in the first test point, the second test point, the 3rd test point, the 4th test point and the 5th test point every day6Concentration measures, and opens test valve SF6Tester measures, and measures and closes test valve after terminating;
6) METHOD FOR CONTINUOUS DETERMINATION 300 days, and SF will be measured6Percent concentration and minute day data draw graph of a relation, thus drawing this pre-gas-removing bandwidth in open-assembly time tunnel, difference tunnel, coal seam of this colliery.
2. a kind of method measuring the pre-gas-removing bandwidth in stope working surface of coal mines tunnel according to claim 1, it is characterized in that: in step 1), construction concordant gas injection boring in planning stope, structural belt should be avoided, gas injection dip angle of hole is identical with ocurrence of coal seam direction, and azimuth is vertical working direction;
In step 2) in, cementing filled section arranges a blocking foremost with aperture place, it is prevented that cement flows into note search gas SF6Section;
In step 3), carry out note search gas SF after 24 hours at cementing6, observed pressure table closes gas injection valve after stablizing 1 minute;
In step 4), gas skirt is set at once after development machine is advanced over test point, preserves case and test valve, carry out search gas SF on the same day subsequently6Concentration measures and time record;
In step 5), each test point is at test search gas SF6Before concentration, adjustment answered by tester;
In step 6), by observing the graph of a relation of search gas SF6 percent concentration and minute sky, just intuitively can demonstrate the pre-gas-removing bandwidth value in tunnel of rib difference open-assembly time really.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610046621.2A CN105675815B (en) | 2016-01-25 | 2016-01-25 | A kind of method for determining the pre- gas-removing bandwidth in stope working surface of coal mines tunnel |
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| CN201610046621.2A CN105675815B (en) | 2016-01-25 | 2016-01-25 | A kind of method for determining the pre- gas-removing bandwidth in stope working surface of coal mines tunnel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107676077A (en) * | 2017-10-09 | 2018-02-09 | 阳泉煤业（集团）股份有限公司 | A kind of device and method that explosion coverage in coal seam is determined using search gas |
| CN109252889A (en) * | 2018-11-13 | 2019-01-22 | 煤科集团沈阳研究院有限公司 | A kind of device and method measuring goaf large diameter borehole extraction range |
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| CN102323391A (en) * | 2011-08-25 | 2012-01-18 | 太原理工大学 | Gas distribution detection method in coal mine underground goaf |
| CN104358559A (en) * | 2014-09-16 | 2015-02-18 | 神华集团有限责任公司 | Method for measuring effective coal-mine gas extraction radius |
| 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 |
| CN104675426A (en) * | 2014-12-16 | 2015-06-03 | 中建城开建设集团有限公司 | Gas outburst prevention construction method suitable for unprotected single coal seam mining |
| CN104863627A (en) * | 2015-03-18 | 2015-08-26 | 中煤科工集团重庆研究院有限公司 | Method for predicting gas emission quantity of working face under pressure relief condition |
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- 2016-01-25 CN CN201610046621.2A patent/CN105675815B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102323391A (en) * | 2011-08-25 | 2012-01-18 | 太原理工大学 | Gas distribution detection method in coal mine underground goaf |
| CN104358559A (en) * | 2014-09-16 | 2015-02-18 | 神华集团有限责任公司 | Method for measuring effective coal-mine gas extraction radius |
| 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 |
| CN104675426A (en) * | 2014-12-16 | 2015-06-03 | 中建城开建设集团有限公司 | Gas outburst prevention construction method suitable for unprotected single coal seam mining |
| CN104863627A (en) * | 2015-03-18 | 2015-08-26 | 中煤科工集团重庆研究院有限公司 | Method for predicting gas emission quantity of working face under pressure relief condition |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107676077A (en) * | 2017-10-09 | 2018-02-09 | 阳泉煤业（集团）股份有限公司 | A kind of device and method that explosion coverage in coal seam is determined using search gas |
| CN109252889A (en) * | 2018-11-13 | 2019-01-22 | 煤科集团沈阳研究院有限公司 | A kind of device and method measuring goaf large diameter borehole extraction range |
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