千米深井动压巷道变形破坏主控因素及切顶护巷技术研究

Research on deformation and damage mechanism of dynamic pressure roadway and top-cutting protection technology of kilometer deep mining

为解决红阳三矿703工作面深部动压巷道支护困难问题,基于现场地质条件和动压巷道变形数据,分析了动压巷道变形破坏特征,确定了巷道变形破坏主要影响因素为巷道围岩强度低、高地应力、强开采动压,提出了切顶卸压+NPR恒阻大变形锚索支护控制技术并进行现场应用,有效控制了动压巷道的变形。现场实践表明,成巷区巷道顶板整体下沉量较小,实施切顶卸压后的巷道变形量与原支护相比,底鼓量平均减小30%,顶板下沉量平均减小33%,两帮移近量平均减小41%。

In order to solve the difficult problem of dynamic pressure roadway support in 703 working face of Hongyang No.3 Mine,based on the on-site geological conditions and dynamic pressure roadway deformation data,the deformation and failure characteristics of dynamic pressure roadway were analyzed,and the main influencing factor of roadway deformation and damage was determined to be the strength of roadway surrounding rock.Low and high ground stress and strong mining dynamic pressure.The control technology of roof cutting pressure relief+NPR constant resistance and large deformation anchor cable support is proposed to effectively control the deformation of the dynamic pressure roadway.Field practice shows that the overall subsidence of the roadway roof in the roadway area is small.After the implementation of roof cutting pressure relief Compared with the original support,the deformation of the roadway is reduced by 30%on average,the subsidence of the roof is reduced by 33%on average,and the moving amount of the two sides is reduced by 41%on average.