Three Dimension Stability Analysis of Shenyang Subway Tunnel Excavation Based on FLAC^3D

Ground settlement and tunnel stability problem caused by tunnel excavation are two key problems of subway tunnel construction.Based on the background of ShenYang subway No.1 Line, according to geological data, three dimension numerical model of tunnel excavation is established.To study soil settlement with excavation process more exactly, shotcrete and concrete liner are studied respectively.The relationship between soil settlement and excavation process by using different support thickness is established.