复杂煤层群开采条件下沿空掘巷合理煤柱宽度的确定

Determination and application of rational coal pillar width for roadway driving along goaf in complex seam group

以山脚树矿22155工作面为工程背景,根据该工作面的工程地质情况及煤层群上下工作面开采关系,采用数值分析的方法计算得出22153采空区边缘煤体内部应力集中系数,并依据弹塑性力学理论,提出合理煤柱宽度的计算公式.研究结果表明:通过极限平衡理论计算得到的巷道侧塑性区宽度较直接采用锚杆支护长度更合理;对于复杂煤层群开采条件下,应力集中系数可采用数值分析的方法获取;运用该方法所计算的复杂煤层群开采条件下煤柱宽度经过现场实践检验是科学、合理的.

Shanjiaoshu Mine 22155 working face was taken as the engineering background, according to the engineering geology condition of the working face and the relation of upper and lower working face mining in coal seam group, using numerical analysis method to calculate the internal stress concentration factor of 22153 goaf edge coal body, and based on the elastic - plastic mechanics theory, a computational formula for the reasonable width of coal column was put forward. The results show that the roadway side plastic zone width calculate by limit equilibrium theory is more reasonable than the one directly calculated by using the bolt length. And that in complex coal seam mining conditions, the stress concentration coefficient is obtained by the method of numerical analysis. And the field practice proves that coal pillar width calculated by the formula for complex coal seam mining conditions is scientific and reasonable.