Comparison and Analysis on Surface Settlement Caused by Multi-arch Tunnel and Neighborhood Tunnel Construction

摘要

Wuncunshan tunnel on JC3 bid section of airport Highway in Xiamen, which locates in busy downtown area and goes underneath 67 buildings with shallow foundation, is expected to control the surface settlement caused by tunnel excavation. Multi-arch tunnel method and neighborhood tunnel method were both tested by design and excavation unit in order to understand which is more effective to control the surface settlement. Based on in-situ measurement and numerical simulation, this paper contrasts and analyzes measurement data and numerical results of the two excavation methods including transverse and longitudinal surface settlement and individual effect of sub-hole excavating and dismantlement supports. Some conclusions are obtained, which provide good reference for design and excavation of similar tunnels.