支护和加固期间复线隧道围岩稳定性因素分析

采用弹塑性有限元法分析了复线隧道在喷锚支护和注浆加固过程中喷混凝土强度、厚度，锚杆强度、直径、间距以及注浆范围内围岩内聚力、内摩擦角等对围岩稳定性的影响，为隧道和地下结构的优化设计和工程问题处理提供参考。文中围岩用四边形单元离散，喷混凝土和锚杆用杆单元模拟，滑动面作低强度介质处理，采用普通四节点等参元。

Analysis of stability factors of surrounding rock in double track tunnel during support and reinforcement

This paper analyses influence of shotcrete′s strength and thickness ,anchors′ strength , diameter and space ,surrounding rock′s cohesion,internal friction angle etc. within grouting region on surrounding rock stability of double track tunnel during support and reinforcement by using a elastoplastic finite element method,which provides reference for optimization design for tunnel and underground structure and engineering disposal . In the paper ,surrounding rock is dispersed by rectangular elements ,then shotcrete and anchors are imitated by using truss elements . Slide plane is dealt with a low intensity medium,and the common isoparametric element with four node is adopted .