地质构造影响区破碎围岩巷道支护技术研究

Research on support technology for fractured surrounding rock roadway in geological structure affected area

地质构造影响区巷道掘进期间普遍面临围岩破碎、构造应力发育等,巷道掘进期间容易出现冒顶、片帮、围岩变形量大等问题,是矿井煤炭生产期间需要重点解决的问题。以S204回风顺槽通过F34断层为工程背景,为实现巷道围岩变形有效控制,采用数值模拟研究分析S204回风顺槽原支护措施下围岩变形情况,发现现有支护措施无法满足支护强度要求,支护完成30 d后掘进断面左帮整体垮落,右帮变形严重,底板鼓起。依据现场情况对F34断层区域进行超前注浆,结合U型钢增强支护,使用顶板离层仪对增强支护措施进行考察,根据观测结果可知,断层区域超前注浆结合U型钢支护有效控制S204回风顺槽通过F34断层围岩失稳,最大位移量30mm,围岩稳定。

During the excavation of tunnels in geological structure affected areas,it is common to face problems such as rock fragmentation and structural stress development.During the excavation of tunnels,problems such as roof fall,wall fragmentation,and large deformation of the surrounding rock are prone to occur,which are key issues that need to be addressed during coal production in the mine.Taking the S204 return air passage through the F34 fault as the engineering background,in order to effectively control the deformation of the surrounding rock of the tunnel,numerical simulation research was used to analyze the deformation of the surrounding rock under the original support measures of the S204 return air passage.It was found that the existing support measures could not meet the requirements of support strength.After 30 days of support completion,the left side of the excavation section collapsed as a whole,the right side deformed severely,and the bottom plate bulged.Based on the on-site situation,advanced grouting was carried out in the F34 fault area,combined with U-shaped steel reinforcement support.The reinforcement support measures were investigated using a roof separation device.According to the observation results,advanced grouting in the fault area combined with U-shaped steel support effectively controlled the instability of the S204 return air passage through the F34 fault surrounding rock,with a maximum displacement of 30 mm and stable surrounding rock.