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Dynamic Mechanical Response and Movement Evolution Characteristics of Fault Systems in the Coal Mining Process

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Abstract

In the mining process of a coal seam containing a fault structure, due to the influence of mining stress, the rock mass inside the fault zone and between the fault and the coal pillar that is preserved to prevent fault activation is prone to producing damage and activation. This study is focused on this problem. Based on the analysis of the failure, activation and movement of the rock mass in front of the fault body and the coal wall, extended finite element numerical simulation software is adopted to study the stress evolution and deformation failure rules of a coal seam containing a fault floor. In particular, the dynamic response process (including slip velocity, slip distance and friction force) of the fault structure under mining conditions is monitored, and then the turning and failure process of the fault structure is analysed. However, an analogue modelling is reformed. A similar material analysis model is established to monitor the displacement field changes near the fault during the mining process, obtain the movement rules of the fault zone and surrounding rock mass during the mining process, and then verify the reliability of the numerical simulation results. The research results can provide references for exploring the coupling movement rules between the fault and the work area for production in the mining process of coal seam stopes, as well as prevention before water inrush under the influence of the fault and treatment after water inrush.

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Acknowledgements

Funding was provided by the National Natural Science Foundation of China (52104203); Shandong Province Natural Science Foundation Project (ZR2020QE128); National Key R&D Program of China (2018YFC0604705); SDUST Research Fund (grant 2018TDJH102); National Natural Science Foundation of China (Grant nos. 51574159, 52074251, 51974172, 51974173, 92058211 and 51804179); Central Universities (No. 842012003), and 111 project (No. B20048). Central Universities (No. 842012003), and 111 project (No. B20048).

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Authors and Affiliations

  1. College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, 266590, China

    Jinhai Zhao, Chen Juntao, Zhihao Zhao & Zhang Xinguo

  2. State Key Laboratory Breeding Base for Mining Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao, 266590, China

    Jinhai Zhao, Chen Juntao & Zhang Xinguo

  3. Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Lab of Submarine Geosciences and Prospecting Techniques, MOE College of Marine Geosciences Institute of Advanced Ocean Study Ocean University of China, Qingdao, 266100, China

    Xing Huilin

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  1. Jinhai Zhao
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Zhao, J., Juntao, C., Huilin, X. et al. Dynamic Mechanical Response and Movement Evolution Characteristics of Fault Systems in the Coal Mining Process. Pure Appl. Geophys. 179, 233–246 (2022). https://doi.org/10.1007/s00024-021-02905-w

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