极近距离煤层下位煤层回采巷道合理位置的探讨研究

基于极近距离煤层开采条件,应用弹塑性理论及弹性力学理论分别对上位煤层开采后对底板的屈服破坏深度及残留煤柱在底板的应力分布情况进行力学分析计算。通过对煤层塑性煤柱临界宽度的计算,确定上位残留煤柱的稳定性,其在底板的非均布应力对下位回采巷道的合理布置至关重要。经过综合分析确定出下位回采巷道合理的内错距,此方法可为极近距离煤层开采回采巷道的合理位置的确定提供一定的参考。

Study on the Reasonable Position Determination of Workface Roadway in Ultra-Close Coal Seam

Based on ultra-close coal seam mining conditions,applying the elastic-plastic theory and the theory of elastic mechanics to calculate the floor destruction depth after coal seam mining and residual coal pillars the stress distribution at the bottom of floor.Calculations suggest that after coal seam mining the biggest floor destruction depth and residual coal pillars the stress distribution not-uniform characteristics.The stress distribution at the bottom of floor is very important for the reasonable layout of the lower coal seam.After the comprehensive analysis identify the reasonable inner stagger distance.This method provides an certain reference value for ultra-close coal seam mining.