综放沿空巷道围岩系统稳定性的UDEC模拟分析

Study by udec simulation of fully-mechanized caving roadway surrounding rock system

摘要: 厚煤层综采放顶煤开采的沿空巷道顶、帮均为煤体或煤柱,其稳定性问题十分突出。本文以南屯煤矿综放沿空巷道为原型,进行了围岩稳定性的离散元数值模拟,提取表征巷道围岩系统的顶板下沉量ydis、煤柱表面水平位移xdis、煤柱垂直应力syy等指标,判断巷道的稳定性,确定合理的煤柱尺寸和支护方式。通过综放沿空巷道稳定性的离散元数值模拟分析,得到了一定地质条件下,综放沿空巷道稳定性与煤柱尺寸及支护方法的一些关系,对煤矿成功解决综放沿空巷道的支护,提高围岩稳定性,具有一定的现实意义。

Abstract: The roof and side of fully-mechanized caving roadway are coal and pillar which cause the stability problem extremely prominent. The fully-mechanized caving roadway of Nantun colliery is set as the prototype,its surrounding rock stability problem is analyzed by numerical simulation with distinct element method.The roof subsidence, horizontal displacement of pillar surface, vertical stress in pillar are collected to judge the stability of roadway and determine stable pillar width and way of supports.