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

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...

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Bibliographic Details
Published in:Pure and applied geophysics 2022, Vol.179 (1), p.233-246
Main Authors: Zhao, Jinhai, Juntao, Chen, Huilin, Xing, Zhao, Zhihao, Xinguo, Zhang
Format: Article
Language:English
Subjects:
Coal
Coal mining
Computer simulation
Deformation
Dynamic response
Earth and Environmental Science
Earth Sciences
Evolution
Failure analysis
Fault zones
Faults
Finite element method
Geophysics/Geodesy
Mathematical models
Mechanical analysis
Numerical simulations
Rock masses
Rocks
Simulation
Slip velocity
Water inrush
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Summary: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.
ISSN:0033-4553
1420-9136
DOI:10.1007/s00024-021-02905-w