遗留煤柱下伏近距煤层巷道布置及围岩稳定性

Stability of Surrounding Rock and Roadway Layout in Close Coal Seam Underlying Residual Coal Pillar

针对某矿遗留煤柱下伏近距煤层巷道围岩变形大、不易控制等难题,采用数值分析方法,结合现场工业性试验,研究了遗留煤柱下伏煤岩体的强度系数和应力影响规律,优化了该矿巷道布置方式。研究结果表明:上覆煤层采完后,形成了以遗留煤柱为中心的五边形围岩强度极低区和半圆强度极低区,在进行巷道位置选取时,须避开该区域以保证围岩的稳定。

For the problem that it is hard to control the large deformation of roadway surrounding rock which underlies residual coal pillar of close coal seam in a coal mine, strength coefficient and stress influence laws of coal seam underlying coal pillar are studied by the numerical analysis method, and combined with the industrial test, the arrangement of roadway has been optimized.The results show that after the mining of overlying coal seam, the extremely low area of surrounding rock, like a pentagon and taking the residual coal pillar as the center, is formed, as well as an area like semicircle is formed. Therefore, to ensure the stability of surrounding rock, when the layout of roadway is designed under this conditions, these areas should be avoided.