CN103089305A - Risk assessment method for coal and gas outburst of coal beds - Google Patents
Risk assessment method for coal and gas outburst of coal beds Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000012502 risk assessment Methods 0.000 title abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 230000006378 damage Effects 0.000 claims abstract description 6
- 238000009792 diffusion process Methods 0.000 claims abstract description 5
- 238000010276 construction Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 4
- 230000008014 freezing Effects 0.000 claims description 3
- 238000007710 freezing Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 2
- 238000012850 discrimination method Methods 0.000 claims 3
- 238000005065 mining Methods 0.000 abstract description 8
- 230000002265 prevention Effects 0.000 abstract description 7
- 238000004458 analytical method Methods 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 3
- 238000004364 calculation method Methods 0.000 abstract 1
- 238000005553 drilling Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- 239000011435 rock Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
- 230000009885 systemic effect Effects 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
The invention discloses a risk assessment method for coal and gas outburst of coal beds and belongs to the technical field of coal mine safety. The method is applied to risk assessment of the coal and gas outburst of coal beds of a newly-built or rebuilt coal mine. The method is composed of a coal bed outburst risk leading index method and an influencing factor index calculation method. Leading index factors comprise a dynamical phenomenon in the process of drilling and production in accordance with geology, coal bed gas pressure P, coal bed gas diffusion initial speed DeltaP, coal bed firmness coefficient f and damage types of coal. According to influencing factor indexes of mining conditions, structure types of the coal and industrial analyses, geological conditions, coal bed gas and outburst conditions of adjacent mines, a risk value of coal bed outburst is calculated. By utilization of leading indexes and influencing factor indexes, the value is calculated and foundation data of coal bed outburst risk is judged whether to be comprehensive and reliable or not, scientificity and systematicness of assessment work are improved, foundation is provided for mine project approval, mine design and engineer operation, and the method can instruct prevention and control work of outburst disasters.
Description
Technical field
The invention belongs to the safety of coal mines technical field, be specifically related to a kind of risk assessment method of down-hole coal bed coal and Gas Outburst disaster, be applicable to newly-built or reconstruction mine coal seam coal and gas outburst risk assessment.
Background technology
Coal and Gas Outburst (hereinafter to be referred as " giving prominence to ") are a kind of extremely complicated dynamic phenomenons, and time of origin is short, coal and gas dish out to the space or the speed of diffusing very fast, occur outstanding after personnel be difficult to reacts and escapes rapidly.So, the threat that outstanding accident causes personnel is very serious, be the main restricting factor in Safety of Coal Mine Production, seriously affect the fltting speed of tunnelling speed and coal-face, the normal linking of taking over to the digging of mine has brought very large difficulty.At present, China has formed zone, local outburst hazard prediction, outburst prevention measures, measure effect check, safety prevention measure in interior " two quaternities " comprehensive outburst control measure technical system, effectively instructed the control of outstanding disaster, but, the generation that still can not stop outstanding disaster at present fully.
It is a very necessary job that Coal Seam Outburst Hazard is evaluated in outstanding diaster prevention and control work, particularly at the feasibility study stage of mine construction.Projecting mine and non-projecting mine are arranged in digging deployment, tunnel, coal-mining method even ventilation system etc. relate to and all being very different on mine problem of overall importance, if not carrying out the outburst hazard assessment namely relates to by non-projecting mine, in case find to have outburst danger after shaft building, owing to lacking necessary counter-measure, not only can directly threaten production safety, and to mine production cause very large passive.Adjustment System is not only very difficult, and is transformation and repairing on existed system after all, will expend more fund, but is not easy the effect that obtains.
" control coal and Gas Outburst regulation " is the directive document of China's coal-mine coal and Gas Outburst diaster prevention and control, and wherein the 8th basic data to Coal Seam Outburst Hazard assessment foundation made regulation, comprising: condition of coal seam occurrence and stability thereof; The structure types of coal and Industrial Analysis; The solid coefficient of coal, coal seam rock property and thickness; The indexs such as gas diffusion initial speed of coal seam gas-bearing capacity, gas composition and coal; Indicate the gas-geologic map of gas bearing capacity isopleth; Geological structure type and feature thereof, igneous rock intrusion form and distribution thereof, hydrogeological situation; Gas dynamic phenomenon when in exploration process, the coal seam is passed in boring; The gas situation in contiguous colliery.But, " control coal with Gas Outburst regulation " to how the analysis-by-synthesis basic data judge that Coal Seam Outburst Hazard is not made and implement regulation, China also formulate as " coal and gas outburst mine measurement specification " (AQ1024-2006) codes and standards of character instruct the Coal Seam Outburst Hazard evaluation work.
Summary of the invention
Given this, in order to address the above problem, the present invention proposes a kind of data such as existing Coal Mining Technology condition, coal-bed gas basic parameter of utilizing and is coal seam coal and the gas outburst risk appraisal procedure on basis, to leading indicator, influence factor indication information gather, analysis-by-synthesis and assessment, thereby provide foundation for mine coal and Gas Outburst diaster prevention and control.
For realizing this purpose, the present invention adopts following technical scheme:
Step 1: statistical analysis Coal Seam Outburst Hazard assessment leading indicator, influence factor index.Leading indicator specifically comprises: the dynamic phenomenon in geotechnical boring construction and manufacturing process; Coal-bed gas pressure P, coal-bed gas diffusion initial speed Δ P, the solid coefficient f of coal, the destruction type of coal.The influence factor index is 5, specifically comprises: the structure types of mining conditions, coal and Industrial Analysis, geological conditions influence factor, coal-bed gas situation, adjacent mine outburst situation;
Step 2: according in the geotechnical boring in leading indicator construction and manufacturing process whether the generation dynamic phenomenon is judged Coal Seam Outburst Hazard: if the dynamic phenomenon such as spray orifice, bit freezing occurs judges that directly this coal seam is dangerous seam with potential; If dynamic phenomenon does not occur, continue step 3.
Step 3: according to the solid coefficient f of the coal-bed gas pressure P in leading indicator, coal-bed gas diffusion initial speed Δ P, coal, the destruction type decision Coal Seam Outburst Hazard of coal: if the destruction type of P 〉=0.74MPa, Δ P 〉=10, f≤0.5, coal is III, IV, V class, or f≤0.3, P 〉=0.74MPa, or 0.3＜f≤0.5, P 〉=1.0MPa, or 0.5＜f≤0.8, P 〉=1.50MPa, or P 〉=2.0MPa, judge directly that this coal seam is dangerous seam with potential; Continuation step 4 outside above 5 kinds of situations.
Step 4: judge Coal Seam Outburst Hazard according to the degree of hazard under the effect of 5 influence factor indexs, when Coal Seam Outburst Hazard score value U＜50, judge that this coal seam is non-dangerous seam with potential; When U 〉=50, judge that this coal seam is dangerous seam with potential;
Coal Seam Outburst Hazard score value design formulas: U=U
i* ω
i(1)
In formula:
U-Coal Seam Outburst Hazard score value;
U
iDegree of hazard under-each influence factor index effect, U
1, U
2, U
3, U
4, U
5Be respectively degree of hazard under the structure types of mining conditions, coal and Industrial Analysis, geological conditions influence factor, coal-bed gas situation, the effect of adjacent mine outburst situation influence factor index;
ω
i-The weighted value of each influence factor index, ω
1, ω
2, ω
3, ω
4, ω
5Be respectively the weight of the structure types of mining conditions, coal and Industrial Analysis, geological conditions influence factor, coal-bed gas situation, adjacent mine outburst situation influence factor index, weighted value is respectively 0.25,0.1,0.25,0.25,0.15;
I-influence factor index sequence number, i=1,2,3,4,5;
Wherein: U
1=U
1j* α
1j(j=1,2,3,4), U
11, U
12, U
13, U
14Be respectively the seam mining degree of depth, coal seam surrounding rock stability, ocurrence of coal seam stability, the dangerous assignment of the sub-factor of seam mining method; α
11, α
12, α
13, α
14Be respectively the weight of each sub-factor, weighted value is respectively 0.6,0.15,0.1,0.15;
U
2=U
2j* α
2j(j=1,2,3,4), U
21, U
22, U
23, U
24Be respectively structure types, the moisture of coal, ash content, the dangerous assignment of volatilization molecule factor of coal; α
21, α
22, α
23, α
24Be respectively the weight of each sub-factor, weighted value is respectively 0.6,0.1,0.1,0.2;
U
3=U
3j* α
3j(j=1,2,3), U
31, U
32, U
33Be respectively tomography and fold, igneous rock intrusion, the dangerous assignment of the sub-factor of hydrogeological situation; α
31, α
32, α
33Be respectively the weight of each sub-factor, weighted value is respectively 0.6,0.3,0.1;
U
4=U
4j* α
4j(j=1,2,3), U
41, U
42, U
43Be respectively coal seam gas-bearing capacity, nearly 3 years gas grade appraisings, the dangerous assignment of present stage Gas quantum factor; α
41, α
42, α
43Be respectively the weight of each sub-factor, weighted value is respectively 0.5,0.2,0.3;
U
5=U
5j* α
5j(j=1), U
51For the dangerous assignment of the sub-factor of outstanding situation occurs in adjacent mine; α
51Be the weight of this sub-factor, weighted value is 1;
Practical function of the present invention is, utilize leading indicator, influence factor index to judge that Coal Seam Outburst Hazard according to data comprehensively, reliably, can improve the scientific and systemic of assessment, the exposed coal operation provides foundation for mine project verification, preliminary design and during instructing shaft building, new development engineering, can instruct outstanding diaster prevention and control work simultaneously.
The specific embodiment
The Coal Seam Outburst Hazard assessment level comprises leading indicator and influence factor index.By site inspection profit statistics, collect the True Data of outburst hazard assessment leading indicator and influence factor index.
Carry out the Coal Seam Outburst Hazard assessment according to leading indicator, the decision condition of leading indicator, result of determination are carried out according to table 1.
At first, if in geotechnical boring construction and manufacturing process, the mash gas dynamic phenomenons such as spray orifice, bit freezing occur, judge directly that the coal seam is dangerous seam with potential; If unpowered phenomenon occurs, need to judge according to all the other leading indicators;
Then, if it is III, IV, V that leading indicator satisfies the destruction type of P 〉=0.74MPa, Δ P 〉=10, f≤0.5, coal, or f≤0.3, P 〉=0.74MPa, or 0.3＜f≤0.5, P 〉=1.0MPa, or 0.5＜f≤0.8, P 〉=1.50MPa, or P 〉=2.0MPa, judge that this coal seam is dangerous seam with potential; If needing outside above 5 kinds of situations judged according to the influence factor index.
Table 1 Coal Seam Outburst Hazard assessment leading indicator table
Carry out the Coal Seam Outburst Hazard assessment according to the influence factor index, the sub-factor decision condition under each influence factor index effect, sub-factor weight, the dangerous assignment of sub-factor, factor degree of hazard, coal seam degree of hazard carry out according to table 2.
Calculate Coal Seam Outburst Hazard score value U, the Coal Seam Outburst Hazard decision rule is: when Coal Seam Outburst Hazard score value U＜50, judge that this coal seam is non-dangerous seam with potential; When U 〉=50, judge that this coal seam is dangerous seam with potential;
The specific rules of the dangerous assignment of table 2 neutron factor is: when assignment option corresponding to group factor is concrete numerical value, directly get numerical value in table 2 according to the actual type correspondence of sub-factor;
When every sub-factor correspondence then assignment option corresponding to group factor be numerical value when interval, carry out linear value according to the type numerical value of sub-factor, coal seam surrounding rock stability degree of hazard by formula 2 calculates.
In formula, L
TBe breaking down for the first time step pitch, m;
Table 2 Coal Seam Outburst Hazard assessment influence factor index table
Ocurrence of coal seam stability degree of hazard by formula 3 calculates.
In formula, C
vBe the coal seam coefficient of variation, %;
The moisture degree of hazard of coal by formula 4 calculates.
In formula, M
daMoisture for coal;
The pit ash degree of hazard by formula 5 calculates.
In formula, A
dBe pit ash;
The volatile matter degree of hazard of coal by formula 6 calculates.
In formula, V
dafVolatile matter for coal.
Claims (3)
1. a coal seam coal and gas outburst risk appraisal procedure, it is characterized in that: comprise Coal Seam Outburst Hazard leading indicator criterion, influence factor index computational discrimination method, the leading indicator criterion is according to the mash gas dynamic situation of geotechnical boring construction and manufacturing process; Coal-bed gas pressure P, gas diffusion initial speed Δ P, solid coefficient f, destroy the type situation that exceeds standard; Influence factor index computational discrimination method first to the sub-factor assignment of each influence factor, is calculated single factor degree of hazard, calculates at last the Coal Seam Outburst Hazard score value; Be divided into dangerous seam with potential and two classifications of non-dangerous seam with potential according to leading indicator, influence factor index evaluation result of determination.
2. Coal Seam Outburst Hazard leading indicator criterion according to claim 1, is characterized in that: at first, in geotechnical boring construction and manufacturing process, the mash gas dynamic phenomenons such as spray orifice, bit freezing occur, judge that the coal seam is the outburst hazard coal seam; Then, according to the actual value of the destruction type of P, Δ P, f≤0.5, coal, judge the Coal Seam Outburst Hazard situation.
3. Coal Seam Outburst Hazard according to claim 1 is assessed influence factor index computational discrimination method, and its special being: the Coal Seam Outburst Hazard score value is by U=U
i* ω
i(i=1,2,3,4,5) are definite, wherein, and U
i=U
ij* α
ij, the Coal Seam Outburst Hazard score value is divided into 2 intervals, corresponding 2 kinds of result of determination.
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| CN103424055A (en) * | 2013-07-30 | 2013-12-04 | 西安科技大学 | Method for observing caving steps of fully-enclosed non-pedestrian roadways |
| CN103670511A (en) * | 2013-10-19 | 2014-03-26 | 煤炭工业济南设计研究院有限公司 | Roof strata fracture degree analysis and calculation method |
| CN103900940A (en) * | 2014-03-11 | 2014-07-02 | 中冶集团武汉勘察研究院有限公司 | Judgment method applicable to seepage deformation and damage type of tail silt |
| CN104850897A (en) * | 2015-02-25 | 2015-08-19 | 中国矿业大学 | Prediction method for coal and gas outburst based on seismic information |
| CN106032753A (en) * | 2016-02-03 | 2016-10-19 | 中国矿业大学(北京) | System and method for predicting coal seam stability by coal seam drilling state |
| RU2661498C1 (en) * | 2017-09-13 | 2018-07-17 | Федеральное государственное бюджетное научное учреждение "Федеральный исследовательский центр угля и углехимии Сибирского отделения Российской академии наук" (ФИЦ УУХ СО РАН) | Coal beds outburst hazard spectral-acoustic forecasting method |
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| CN111241697A (en) * | 2020-01-17 | 2020-06-05 | 中国矿业大学(北京) | Mining area gas disaster differentiation prevention and control technology '4 + 18' grading model |
| CN111721912A (en) * | 2020-06-30 | 2020-09-29 | 贵州省煤矿设计研究院有限公司 | Device and method for rapidly measuring gas pressure and gas content of coal seam |
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| CN103670511A (en) * | 2013-10-19 | 2014-03-26 | 煤炭工业济南设计研究院有限公司 | Roof strata fracture degree analysis and calculation method |
| CN103900940A (en) * | 2014-03-11 | 2014-07-02 | 中冶集团武汉勘察研究院有限公司 | Judgment method applicable to seepage deformation and damage type of tail silt |
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| CN106032753A (en) * | 2016-02-03 | 2016-10-19 | 中国矿业大学(北京) | System and method for predicting coal seam stability by coal seam drilling state |
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| CN115711157A (en) * | 2022-11-14 | 2023-02-24 | 北京科技大学 | Coal seam outburst dangerous area identification method based on mining magnetic field distributed monitoring |
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Application publication date: 20130508 |