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工程实践表明,冲击地压发生有一个孕育过程,即具有时间上的滞后性。借鉴基于流变模型的地震孕育过程研究成果,将Burgers-Senvitorve-Bengarm模型应用于狭窄煤柱流变特性研究,结合义马矿区耿村煤矿开采实际情况,重点研究狭窄煤柱冲击地压的孕育过程。结果表明:狭窄煤柱冲击地压孕育过程的前期阶段,弹性变形能的累积大于煤体损伤造成的能量耗散,以弹性变形能的累积为主;狭窄煤柱冲击地压孕育过程的后期阶段,弹性变形能的累积小于煤体损伤造成的能量耗散,以能量耗散为主。软岩孕冲过程中能量的累积和耗散能力较弱,孕冲时间较长,冲击地压发生时释放的能量较小;硬岩孕冲过程中能量的累积和耗散能力较强,孕冲时间较短,冲击地压发生时释放的能量较大。
Engineering practice shows that there is a gestation pressure buildup process that has a time lag. Based on the research results of the geologic incubation process based on the rheological model, the Burgers-Senvitorve-Bengarm model is applied to study the rheological properties of narrow coal pillar. Combining with the actual mining conditions of Gengcun coal mine in Yima, the emphasis is put on the research of rock burst pressure of narrow coal pillar process. The results show that in the early stage of the narrow coal seam rock burst, the cumulative elastic deformation energy is greater than the energy dissipation caused by the coal damage, with the accumulation of elastic deformation energy as the main part. The later stage of the narrow coal pillar rock burst gestation process , The cumulative energy of elastic deformation is less than the energy dissipation caused by the coal damage, mainly energy dissipation. The energy accumulation and dissipation ability of soft rock during pregnancy and punching is weak, the time of pregnant and pregnant is longer, and the energy released when the rockburst occurs is smaller. The energy accumulation and dissipation capacity of hard rock during pregnancy and pregnancy is relatively strong. Rush time is shorter, release of energy when the impact pressure greater.