巨厚岩浆岩失稳的大孤岛工作面防冲研究

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Abstract

Rockbursts induced by instability of super-thick magmatic strata presents a serious threat to mine safety and production. This paper investigates the rockburst mechanism induced by instability of super-thick magmatic strata in Wanglou coal mine using field monitoring，numerical simulation and theoretical analysis. The main results are as follows (1) The rockbursts in island longwall panels induced by instability of super-thick magmatic strata can be classified into two types，spontaneous type and induced type. Spontaneous rockbursts occur due to the overstressing of the instable super-thick magmatic strata and the overburden. Induced rockbursts occur due to the dynamic loading from the movement of super-thick magmatic strata. (2) The criterion for overall burst instability of island longwall panels was proposed. Using the criterion，LW12310 at Wanglou coal mine was designed into large-width island longwall panel to transform the overall rockbursts into local rockbursts. (3) Corresponding measures were developed according to local rockburst mechanism，which agreed well with microseismic and stress monitoring results. The research results provide a practical approach for rockburst prevention of island longwall panels under super-thick magmatic strata.

Key words： mining engineering super-thick magmatic strata instability large island longwall panel rockburst prevention overall rockburst

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https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS1/3382

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