深部高应力软岩巷道围岩破坏机理及全锚索支护技术研究

Research on the failure mechanism of surrounding rock in deep high stress soft rock roadway and full anchor cable support technology

传统锚网索支护无法有效控制深部高应力软岩巷道围岩大变形破坏。本文以古汉山矿1606底抽巷回风巷强矿压显现为工程背景,建立了深部高应力软岩巷道围岩破坏数值模型,探究了深部高应力软岩巷道围岩破坏机理,提出了深部高应力软岩巷道围岩控制对策,提出深部软岩巷道“短锚索固帮+长锚索强顶”的全锚索加固技术。现场工程实践表明,该技术可明显提高支护刚度与强度,改善锚固范围内的破碎围岩力学性质,有效控制了深部软岩巷道围岩大变形。

The traditional bolt-mesh-cable support can not effectively control the large deformation and failure of surrounding rock in deep high stress soft rock roadway.In this paper,the numerical model of surrounding rock failure in deep high-stress soft rock roadway was established based on the strong mine pressure in the return airway of No.1606 bottom pumping roadway in Guhanshan Mine.The failure mechanism of surrounding rock in deep high-stress soft rock roadway was explored.The control countermeasures of surrounding rock in deep high-stress soft rock roadway were put forward,and the whole anchor cable reinforcement technology of"short anchor cable fixing side+long anchor cable strong roof"in deep soft rock roadway was put forward.The field engineering practice showed that this technology could significantly improve the support stiffness and strength,improve the mechanical properties of broken surrounding rock within the anchorage range,and effectively control the large deformation of surrounding rock in deep soft rock roadway.