基于AE的深部复变环境下急斜特厚煤层开采动力失稳分析

Dynamical destabilization analysis of steep and heavy thick coal seam in a deep-mine under the complex-variable environment based on AE

华亭煤矿5#煤是赋存在深部的急斜特厚煤层,其开采扰动极其频繁,最大主应力与最小主应力相差较大,开采过程中频繁出现动力失稳并诱致衍生灾害.基于声发射的煤岩动力失稳行为实验与现场相关测试的比较,综合分析了复杂变化环境下煤岩在不同的动态拉伸比能、压缩变形阻力和剪切应力作用下的失稳声发射能率和总事件等定量规律.

The No. 5 coal of Huating Coal Mine in China is a deep and heavy thick coal seam. In the coal seam, the dependence of excavation and disturbance is very serious, the difference between the maximum and minimum principal stress levels is greater, and there are frequent destabilizations leading to hazards during min- ing. Based on the comparison of the acoustic emission （AE） experiment of coal-rock unstable crack propagation and destabilization with their in-situ measurement, this paper investigated the regularity of various dynamics load and comprehensively analyzed the quantificational destabilization characters including variable dynamical specific energy of tension, resistance to compression, and proportional limit of shear under the complex-variable excavation and geological environment.