高应力软岩条件下错层位外错式相邻巷道联合支护技术研究

Study on Combined Support Technology of Adjacent Roadway with External-misaligned Stagger Arrangement under Condition of High Stress Soft Rock

针对孔庄矿7301运输巷受高应力软岩影响,巷道难支护、变形严重等问题,从构造应力、顶底板岩性和巷道布置方式及支护参数3个方面分析巷道变形原因,决定采用"错层位外错式相邻巷道联合支护技术",采用数值模拟对原巷道支护方式和相邻巷道联合支护技术在垂直应力分布和塑性区范围2个方面进行分析,结果表明相邻巷道联合支护可抑制塑性区扩展。现场监测表明,顶板最大下沉量为76 mm,最大底鼓量为38 mm,两帮最大内移量为135 mm,表明采用"错层位外错式相邻巷道联合支护技术"巷道围岩的整体支护效果得到明显改善。

In Kongzhuang mine transportation lane 7301 affected by high stress soft rock roadway supporting,severe deformation problems such as difficult,from the tectonic stress,the roof and floor lithologic roadway layouts and supporting parameters and three aspects,analyzes the reasons of deformation of roadway,decided to adopt " combined support technology of adjacent roadways with external-misaligned stagger arrangement ",the numerical simulation of the original support way and the adjacent joint of roadway supporting technology in two aspects of the vertical stress distribution and the plastic zone were analyzed,and the results show that the adjacent joint supporting of roadway can inhibit the extension of the plastic zone.field monitoring shows that the maximum roof subsidence is 76 mm, the maximum floor heave is 38 mm,and the maximum internal displacement of both sides is 135 mm, which indicates that the overall supporting effect of surrounding rock of the roadway is significantly improved by adopting the "combined support technology of adjacent roadways with external-misaligned stagger arrangement ".