隧道围岩块体稳定性分析及支护对策

摘要

Tunnel surrounding rock is cut into blocks by faults and joints.Artificial excavation breaks the natural balance of these blocks.The slippage of these unstable blocks is an important factor causing the instability of surrounding rock.Based on the block theory,the surrounding rock block stability of Lotus mountain No.2 tunnel was analyzed by using the Unwedge software.The maximum net sliding load and safety factor of the unstable blocks were calculated.Based on the calculation results,specific supporting countermeasures were suggested.%隧道围岩中的节理和断层将岩体切割成块体,人工开挖打破了块体的自然平衡状态.这些不稳定块体的滑移是造成隧道围岩失稳的重要因素.基于块体理论,利用块体计算程序Unwedge分析了潮惠高速公路莲花山2号隧道围岩块体稳定性,并计算给出不稳定块体的最大净滑动力和安全系数,在此基础上制定了针对性的支护措施.