大断面直墙半圆拱巷道支护设计与优化

Supporting design and optimization of large section roadway with straight wall and semicircle arch

针对大断面巷道支护难度大、变形严重的问题,以新峪矿第二轨道巷为工程背景,通过理论计算,结合数值模拟,研究了巷道围岩变形破坏特征,分析了巷道的应力和塑性区分布情况,提出了巷道最优支护参数,并结合现场条件应用于工程实践。现场实测数据证实了新方案能有效控制巷道围岩变形,提高巷道的安全性。研究结果表明:巷道帮部和角部是支护的关键部位,加强其支护强度有利于提高巷道整体稳定性。

Aiming at the problem of supporting difficulties and serious deformation in large section roadway, took the 2nd rail roadway in Xinyu mine as engineering background, the method of theoretical calculation combined with numerical simulation are adopted to analyze characteristics of deformation and damage in roadway surrounding rock, the stress state and plastic zone distribution are also analyzed. Based on above researches, the optimal supporting parameters are proposed and applied in engineering practice with field condition. According to the in-situ monitor data, the new scheme can effectively control deformation of roadway surrounding rock, improve the overall safety. The research results show： Strengthen the support strength of sidewall and corner can improve the stability of roadway as they are the key support parts.