Risk assessment of water inrush from coal seam floors based on multiple methods

Authors

REN Junhao, College of Resources & Environment, Henan Polytechnic University, Jiaozuo 454003, ChinaFollow
WANG Xinyi, College of Resources & Environment, Henan Polytechnic University, Jiaozuo 454003, China; The Central Plains Economic Zone(Shale) of Coal Seam Gas Collaborative Innovation Center in Henan Province, Jiaozuo 454003, China; Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Jiaozuo 454003, ChinaFollow
WANG Qi, College of Geosciences and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
WANG Junzhi, Shanghai Yaxin Construction Engineering Co., Ltd., Shanghai 201900, China
ZHANG Bo, Institute of Energy and Chemical Industry, China Pingmei Shenma Group, Pingdingshan 467000, China
GUO Shuitao, Henan Jiaozuo Coal Energy Co., Ltd., Jiaozuo 454100, China

Abstract

Five factors including the thickness of the aquifer, the complexity of the fault, the water pressure of the aquifer, the unit water inflow of the aquifer, and mining height of 51 boreholes in No.2, No.10 and No.12 Coal Mines of Pingdingshan Coalfield are selected as the index factors. On the basis of the constant weight calculated by the analytic hierarchy process and grey relational analysis, the variable weights of each index factor are determined by applying the variable weight theory. By using the matter-element extension method, fuzzy variable set theory, catastrophe theory, and fuzzy comprehensive evaluation method, the water inrush risk of coal seam floors is evaluated and the water inrush risk grade is determined. The comparative analysis of the actual mining situation shows that the fuzzy variable set theory is the most suitable method for risk evaluation of floor water inrush in the study area, and its evaluation results are more consistent with the actual situation. The evaluation based on the fuzzy variable set theory shows that the proportions of safety zones in the pressure zones of No.2, No.10 and No.12 Coal Mine are 4.08%, 14.30% and 0 respectively; the proportions of low threat zones are 76.91%, 83.14% and 85.78% respectively; and the proportions of high threat zones are 19.01%, 2.56% and 14.22% respectively. There is no danger zones in the study area temporarily.

Keywords

multi index factors, variable weight theory, multiple methods, risk evaluation of water inrush, Pingdingshan Coalfield

DOI

10.12363/issn.1001-1986.21.06.0342

Recommended Citation

REN Junhao, WANG Xinyi, WANG Qi, et al. (2022) "Risk assessment of water inrush from coal seam floors based on multiple methods," Coal Geology & Exploration: Vol. 50: Iss. 2, Article 12.
DOI: 10.12363/issn.1001-1986.21.06.0342
Available at: https://cge.researchcommons.org/journal/vol50/iss2/12

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