急斜煤层水平分段综放开采围岩失稳特征分析

Analysis of instability characteristics of surrounding rock within horizontal section caving face in steep coal seam

针对急斜煤层水平分段综放开采围岩失稳特征,通过对围岩力学模型分析,研究围岩结构的失稳过程和演化途径。根据急斜煤层围岩的非对称分布特点,所产生的非对称作用极易使围岩发生局部变形。局部变形的不断扩展进而将导致围岩发生失稳,这种动力学失稳极易演化为灾害。为了控制这种灾害的发生,借助声发射和钻孔窥视实时监测围岩"损伤-破裂-失稳"的全过程,将为工作面开采扰动区围岩失稳与控制提供了值得借鉴的依据。

Based on the instability characteristics of surrounding rock within the horizontal section caving face in steep coal seam,through the analysis of surrounding rock mechanics model,we study the instability process of surrounding rock structure and evolution mean.Because of the non-symmetric effect caused by the non-symmetric distribution of surrounding rock in steep seam,there will be a greater possibility for the occurrence of local deformation in surrounding rock.The local deformation expansion will lead to...