采场前方应力分布参数的分析与模拟计算

从微观岩体力学模型入手，分析了采场前方应力集中峰位置分布计算公式中的煤体强度a₀，应力集中系数k和摩擦因素f_s等3个关键参数，指出它们是随着工作面推进而动态变化的参数；确定了公式中a₀在不同区段的取值(如破坏区、塑性区和弹性区依次取值为σ*_c，σ_c和σ_c)和计算公式，指出σ*_c，σ_c和σ_c等3个值之间存在过渡数值.在此基础上，进行了相关模拟计算和对比分析，结果显示，工作面推进过程中出现的破碎区宽度大于塑性区宽度.

Analysis and calculation on parameters of stress distribution of the front coal mining face

Based on the micro rock mechanics model, three key parameters(a0, k and fs) in the formula of stress distribution were analyzed. With the propagation of the mining face, these parameters are changed. The parameter a0 in broken zone, plastic zone and elastic zone is σ*c,σc and σc differently, and there are transitional values among the σ*c,σc and σc. Relevant simulation and analysis were conducted, and it is shown that the width of broken zone is bigger than the one of plastic zone in the process of the propagation of the mining face.