Disasters of gas-coal spontaneous combustion in goaf of steeply inclined extra-thick coal seams

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外文摘要：In light of the escalating global energy imperatives,mining of challenging-to-access resources,such as steeply inclined extra-thick coal seams(SIEC),has emerged as one of the future trends within the domain of energy advancement.However,there is a risk of gas and coal spontaneous combustion coupling di-sasters(GCC)within the goaf of SIEC due to the complex goaf structure engendered by the unique mining methodologies of SIEC.To ensure that SIEC is mined safely and efficiently,this study conducts research on the GCC within the goaf of SIEC using field observation,theoretical analysis,and numerical modeling.The results demonstrate that the dip angle,the structural dimensions in terms of width-to-length ratio,and compressive strength of the overlying rock are the key factors contributing to the goaf instability of SIEC.The gangue was asymmetrically filled,primarily accumulating within the central and lower por-tions of the goaf,and the filling height increased proportionally with the advancing caving height,the expansion coefficient,and the thickness of the surrounding rock formation.The GCC occurs in the goaf of SIEC,with an air-return side range of 41 m and an air-intake side range of 14 m,at the intersection area of the"＜"-shaped oxygen concentration distribution(coal spontaneous combustion)and the"＞"-shaped gas concentration distribution(gas explosion).The optimal nitrogen flow rate is 1000 m3/h with an injection port situated 25 m away from the working face for the highest nitrogen diffusion efficacy and lowest risk of gas explosion,coal spontaneous combustion,and GCC.It has significant engineering ap-plications for ensuring the safe mining of SIEC threatened by the GCC.

外文关键词：

Steeply inclined extra-thick coal seamsGas explosionCoal spontaneous combustionCoupling disasterNumerical simulation

作者：

Qiming Zhang、Enyuan Wang、Xiaojun Feng、Shuxin Liu、Dong Chen

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作者单位：

Key Laboratory of Gas and Fire Control for Coal Mines(China University of Mining and Technology),Ministry of Education,Xuzhou,221116,China

School of Safety Engineering,China University of Mining and Technology,Xuzhou,221116,China

Henan Shenhuo Coal & Power Co.,Ltd.,Yongcheng,476600,China

State Key Laboratory for Geomechanics & Deep Underground Engineering,China University of Mining and Technology,Xuzhou,221116,China

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基金：

National Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China Youth Foundation

项目编号：

2022YFC30047045237424152104230

出版年：

2024

DOI：

10.1016/j.jrmge.2023.12.008

岩石力学与岩土工程学报(英文版)

中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD

影响因子：0.404

ISSN：1674-7755

年,卷(期)：2024.16(10)