基于围岩破坏区和承载力的锚杆支护设计

Design of anchor bolt support based on analysis of surround rock damage area and bear force

从岩石力学最大周向拉应力破坏准则理论出发,结合隧道工程实例,运用理论分析和现场试验数据统计分析的方法,研究了隧道开挖过程中破坏区域的范围和破坏规律,并对破坏区域的承载能力进行了分析。结果表明:隧道开挖过程中围岩破坏区域承载了很大的荷载,而支护体系承受的荷载只是很小一部分;围岩破坏范围和破坏区域的承载能力可以通过岩体的力学参数进行计算得出。工程应用表明,锚杆支护设计参数可以通过计算围岩的破坏区域和承载能力获得。

Based on the maximum circumferential tensile stress failure criterion in rock mechanics, combined with a tunnel project, this paper analyzes the failure area range and the failure law during tunnel excavation. Through theoretic analysis and field test, the bearing capacity at failure zone is studied. The result shows that： the surrounding rock failure zone bears more loads compared with the supporting system during tunnel excavation; the surrounding rock failure range and failure zone＇s bearing capacity can be worked out by using rock dynamic parameters. Project engineering practice indicates that the anchor bolt support design can be achieved by computing the surrounding rock failure range and bearing capacity. 2 tabs, 2 figs, 10 refs.