急斜煤岩体动力失稳时空演化特征综合分析

doi:10.13722/j.cnki.jrme.2017.1115

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摘要急斜煤层水平分段综放开采易诱发动力学灾害，掌握急斜煤岩体动力失稳时空演化特征对安全开采至关重要。以急斜煤层巷道煤岩体稳定性控制为目标，利用现场调查，理论分析获取急斜煤岩体动力失稳理论判据。采用数值计算，物理模型试验和现场监测等手段，综合分析急斜煤岩体失稳时空演化特征：急斜煤层巷道顶板侧煤岩体变形失稳表现为起始于开挖自由面中部位置的同向屈曲现象，底板侧煤岩体表现为起始于底角位置的剪切滑移现象。通过数值计算确定顶底板侧煤岩体动力失稳区水平跨度分别为2.1和1.7 m，物理模型试验结果表明，顶底板侧煤岩体应力集中区分别位于开挖自由面中部和底脚位置，与开挖自由面水平距离分别为1.2和0.8 m。通过急斜煤岩体失稳时空演化特征分析，对支护方式和参数进行优化。现场监测表明，优化支护后巷道最大累积移近量为39.2 cm，变形率降低82.2%，急斜煤岩体动力失稳灾害得到有效治理。

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	张东升3

关键词 ：岩石力学, 急斜煤岩体, 动力失稳特征, 数值计算, 物理模型试验

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.

Key words： rock mechanics steeply inclined coal-rock mass dynamic instability characteristics numerical calculation physical modeling experiment

引用本文:

来兴平1，2，杨毅然1，2，王宁波3，4，单鹏飞1，2，张东升3. 急斜煤岩体动力失稳时空演化特征综合分析[J]. 岩石力学与工程学报, 2018, 37(3): 583-592.
LAI Xingping1，2，YANG Yiran1，2，WANG Ningbo3，4，SHAN Pengfei1，2，ZHANG Dongsheng3. Comprehensive analysis to temporal-spatial variation of dynamic instability of steeply inclined coal-rock mass. , 2018, 37(3): 583-592.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.1115 或 http://www.rockmech.org/CN/Y2018/V37/I3/583

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