隧道穿越断层破碎带超前支护力学效应分析

Analysis on Mecanical Effcets of Per-support for Tunnels Crossing Fault Zone

隧道穿越断层破碎带时,围岩稳定性较差,仅施作“锚喷+钢拱架”支护,难以确保施工安全,有必要采取超前辅助措施,提高围岩稳定性。依托尖子山隧道,建立二维数值计算模型,分析隧道穿越断层带时不同超前支护措施的力学效应,提出合理的超前支护形式,为施工提供指导。

When the tunnel passes through the fault fracture zone,the stability of surrounding rock is poor,and it is difficult to ensure the construction safety by applying only"bolting and shotcrete steel arch frame"support,so it is necessary to take advanced auxiliary measures to improve the stability of surrounding rock.Based on Jianzishan tunnel,a two-dimensional numerical model is established to analyze the mechanical effects of different advance support measures when the tunnel passes through the fault zone.