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 .