Deformation Stability Response of Adjacent Subway Tunnels considering Excavation and Support of Foundation Pit

Abstract Since the safety and stability of original tunnel structure are easily affected by adjacent foundation pit excavation, it is strongly necessary to study deformation evolution tunnels during excavation. With regard two cases that adjacently located at right bottom pit, influence different supporting methods, including pile support, bolt pile-bolt shotcrete-bolt on was investigated basis whole excavation process numerical simulation deep for determining best beneficial tunnel. The results indicate both one-step multistep have great influences displacement tunnels, wherein greater than those pit. Multistep recommended shallow In case maximum stress generated around small, area limited, monitoring points also small. For can effectively limit soil between reduce distribution area, control displacement.