构造应力作用下弱胶结巷道围岩控制技术研究

Research on Surrounding Rock Control Technology of Weakly Cemented Roadway under Tectonic Stress

新疆弱胶结煤系地层巷道普遍存在掘进与维护难度大、安全性差等问题,掌握矿山地应力分布特征对矿井建设及安全生产具有重要意义。采用空心包体应力解除法测量了苇子沟煤矿三维地应力分布的大小及方向,基于地应力测量结果建立了数值模型,分析了巷道实际变形破坏情况,提出了相应的支护方案。研究结果表明:(1)苇子沟煤矿地应力场类型为σ_(HV)型,最大水平主应力对巷道变形破坏与矿压显现影响显著;(2)巷道围岩变形受构造应力影响的程度不同,整体表现为:顶板>右帮>底板>左帮;(3)针对性提出“非对称锚网索喷+泥质底板注浆锚杆”支护方案,该方案对构造应力作用下弱胶结巷道围岩变形起到很好的控制作用,并取得了良好的巷道围岩控制效果。

The roadways in weakly cemented coal measures in Xinjiang are generally difficult to excavate and maintain,and the safety is poor.It is of great significance to master the distribution characteristics of mine in-situ stress for mine construction and safe production.The size and direction of three-dimensional in-situ stress distribution in Weizigou Coal Mine were measured by hollow inclusion stress relief method.Based on the results of in-situ stress measurement,a numerical model was established to analyze the actual deformation and failure of roadway,and the corresponding support scheme was proposed.The results are concluded as follows.Firstly,the type of in-situ stress field in Weizigou Coal Mine isσ_(HV)type,and the maximum horizontal principal stress has a significant influence on the deformation and failure of roadway and the appearance of mine pressure.Secondly,the deformation of roadway surrounding rock is affected by tectonic stress in different degrees.The overall performance is:roof>right side>floor>left side.Thirdly,the supporting scheme of asymmetric anchor net cable spray+argillaceous floor grouting bolt was put forward.This scheme plays a good control role in the deformation of surrounding rock of weakly cemented roadway under the action of tectonic stress,and has achieved good control effect of roadway surrounding rock.