Characteristic of stress evolution on fault surface and coal bursts mechanism during the extraction of longwall face in Yima mining area, China
| Autor: | Yaodong Jiang, Weili Gong, Ruiming Shi, Hongwei Wang, Gang Wang, Daixin Deng |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010504 meteorology & atmospheric sciences
Computer simulation Lateral surface business.industry Coal mining Geology 010502 geochemistry & geophysics Fault (power engineering) 01 natural sciences Mining engineering Shear stress Dynamic pressure Coal Slippage business human activities 0105 earth and related environmental sciences |
| Zdroj: | Journal of Structural Geology. 136:104071 |
| ISSN: | 0191-8141 |
| DOI: | 10.1016/j.jsg.2020.104071 |
| Popis: | Due to strain energy releases sharply, fault slip is often accompanied with sudden stress change around fault structures, especially on the fault surface. In this study, the slippage of a reverse fault structure induced by coal mining in Yima mining area, Henan province, China is studied by employing physical and numerical simulation. The stress evolution around this fault is analyzed to further understand the mechanism of coal bursts around the fault structures. The results show that the normal stress is relatively greater than shear stress on the fault surface, and the normal and shear stress on the fault surface near the coal seam are greater than that far away from the coal seam. It is interesting to find that the variation of normal stress and shear stress on the middle of fault is opposite in the physical model. To in-depth understand this phenomenon, the numerical simulation method is employed to investigate the stress variation and dynamic energy evolution on the fault surface before, during and after fault slip by applied different horizontal stress on the lateral surface of model. The results show that the opposite variation of normal and shear stress is induced by the greater horizontal stress. This phenomenon can be considered as a precursory information for major fault slip. The horizontal stress is the main driving force of the fault slip induced by the coal seam mining. In this study, it is also suggested that the existence of extra-thick conglomerate rock and reverse fault in the high horizontal stress environment could cause large area of roof movement and provide the dynamic pressure source for the occurrence of coal bursts in Yima mining area. |
| Databáze: | OpenAIRE |
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