深部软岩巷道围岩变形特征及数值模拟分析

针对深部煤矿开采条件下软岩巷道围岩出现持续流变时间长、变形大、地压高、巷道难以维护等特点，首先分析了深部软岩巷道变形特征，采用FLAC^3D数值模拟软件，分析了不同埋深条件下巷道围岩垂直应力分布、水平应力分布以及巷道围岩塑性区扩展规律。研究得出，深部软岩巷道的围岩岩块呈松散破碎形态，相互翻转和滑移，岩体的模量和强度低；随着巷道埋深的逐渐增加，巷道围岩应力集中系数逐渐减小，巷道垂直、水平应力峰值逐渐变大，塑性破坏范围扩展速率逐渐增加。研究为深部软岩巷道支护提供理论基础。

Deformation characteristics and numerical simulation analysis of surrounding rock in deep soft rock roadway

In view of characteristics of the soft rock roadway surrounding rock under the mining conditions of deep coal mine，such as long lasting rheological time，large deformation，high ground pressure and difficult maintenance of the roadway，the deformation characteristics of the deep soft rock roadway were analyzed firstly，and the vertical stress distribution，horizontal stress distribution and plastic zone expansion rule of the roadway surrounding rock under different buried depth were analyzed by FLAC3D numerical simulation software.The results showed that the surrounding rock mass of the deep soft rock roadway is in the form of loose and broken，overturning and sliding each other，and the modulus and strength of the rock mass were low；with the gradual increase of the buried depth of the roadway，the stress concentration coefficient of the surrounding rock of the roadway decreases gradually，the vertical and horizontal stress peaks of the roadway increase gradually，and the expansion rate of the plastic damage range increases gradually.The research provided a theoretical basis for the deep soft rock roadway supporting.