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A Simplified Calculation Method for Ultimate Mining Dimension in Thin Coal Seam

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Abstract

Coal seam mining is one of the most widely participated engineering activities in China. This study examined the failure process induced by underground thin coal seam mining of Wangxia perilous rock in Chongqing, China. Numerical simulation was conducted on the stress, displacement and plastic deformation with Fast Lagrangian Analysis of Continua 3D (FLAC3D). Results show that tensile stress is dominant and it keeps increasing during coal mining. The stability failure process experiences four stages from the perspective of crack propagation. A new simplified subsidence prediction method was proposed for quick engineering applications. The relationship between mining geometric parameters and rock mass stability was established and the ultimate mining dimensions were suggested. The simplified method was demonstrated to be reliable.

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Acknowledgements

The authors acknowledge the financial support of the project (LNTCCMA-20200103, LNTCCMA-20200112) supported by the Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education.

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Authors and Affiliations

  1. School of Civil Engineering, Chongqing University, Chongqing, 400044, China

    Yuxin Ban, Qiang Xie & Jianfeng Cui

  2. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Ministry of Education, Chongqing, 400044, China

    Yuxin Ban & Qiang Xie

  3. College of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China

    Xiang Fu

  4. Chongqing Institute of Geology and Mineral Resources, Chongqing, 400010, China

    Hong Xu

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  1. Yuxin Ban
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  2. Xiang Fu
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  3. Qiang Xie
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  4. Jianfeng Cui
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  5. Hong Xu
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Correspondence to Qiang Xie.

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Ban, Y., Fu, X., Xie, Q. et al. A Simplified Calculation Method for Ultimate Mining Dimension in Thin Coal Seam. Geotech Geol Eng 39, 3655–3667 (2021). https://doi.org/10.1007/s10706-021-01717-y

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  • DOI: https://doi.org/10.1007/s10706-021-01717-y

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