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| Comprehensive analysis to temporal-spatial variation of dynamic instability of steeply inclined coal-rock mass |
| LAI Xingping1，2，YANG Yiran1，2，WANG Ningbo3，4，SHAN Pengfei1，2，ZHANG Dongsheng3 |
| (1. School of Energy and Resource，Xi?an University of Science and Technology，Xi?an，Shaanxi 710054，China；2. Key Laboratory of Western Mines and Hazard Prevention，Ministry of Education，Xi?an University of Science and Technology，Xi?an，Shaanxi 710054，China；3. School of Mines，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China；4. Shenhua Xinjiang Energy Co.，Ltd.，Urmchi，Xinjiang 830027，China) |
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Abstract The unique occurrence and mining scheme of steeply inclined coal seams have a great tendency to cause dynamic instability and analyzing the instability characteristics and influential factors of steeply inclined coal seams is critical for safe mining. A comprehensive methodology including in-situ investigation，theoretical analysis，numerical calculation，physical experiment and field monitoring was adopted to investigate the stability of rock surrounding roadway. The relevant results indicate that the deformation and failure of roof side behaves as the synthetic buckling towards the direction of free face，while the one of floor side behaves as the shearing slip. The initial deformation position locates in the middle of roof side roadway，while the one in the floor side locates on the bottom corner. The horizontal span of instability area in roof side and floor side reached approximately 2.1 m and 1.7 m separately，leading to the severe asymmetrical deformation. The physical modeling experiment shows that the acoustic emission(AE) and infrared(IR) thermal joint monitoring system provided the indicator information of surrounding rock failure of roadway. The maximum accumulative convergence reached 39.2 cm after optimized support scheme was applied，the deformation rate reduced about 82.2 percent of original deformation. So the effect of optimized support scheme is remarkable.
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2018, Vol. 37 
