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

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.