Three-dimensional strata movement around coal face of steeply dipping seam group |
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Authors: | Yong-ping Wu Pan-shi Xie Shi-guang Ren Rui-bin Li |
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Affiliation: | (1) Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, School of Mineral Engineering, Xi’an University of Science and Technology, Xi’an, 710054, China;(2) Research Center of Safety and Technology, Shaanxi Coal Chemistry Industrial Group Corporation, Xi’an, 710054, China |
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Abstract: | Steeply dipping seam group, which has complex occurrence conditions, belongs to the steeply dipping seam. The research on
the strata movement around the coal face not only improves safe production technology in practice, but also develops the mining
theory. By using physical simulation experiments, numerical simulation and site test, the deformation, failure and movement
of surrounding rock in longwall working face were analyzed. According to the analysis, characteristics of the seam group were
formed which is different from the single seam. Asymmetry mechanics, sequential changes and imbalance of strata movement along
the tendency working face were summarized. Furthermore, the features of upper and lower seams were different. The mining of
the lower seam induced more complex strata movement along the strike. Multi-section mining disturbed surrounding rocks in
larger areas than the single section mining did, which had an impact on and dynamic loading function to the support when mining
the lower seam, and produced a great influence on the stability of support-rock system.
Supported by the New Century Excellent Talents in University of China (NCET-04-972) |
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Keywords: | strata movement steeply dipping seam group support-rock system mining disturbance |
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