Research on Reasonable Excavation Sequence of Multi-arch Tunnel under Building Bias in Complicated Urban Area Stone Base Asphalt Pavement Structure

Chongqing Yuzhong Connecting Tunnel is located in the most complicated urban area of Chongqing,the tunnel line is full of high-rise buildings and dense pipe networks,overpasses rail traffic line 6 and underpasses Xiaoshizi Railway Station of rail traffic line 1. Design, construction and management of this tunnel face extreme difficulties,and there are multiple control nodes in construction.By selecting the representative control node in construction-side-through Huaxie Bank section as the object of research,this paper confirms an optimal excavation method of the tunnel in which the right hole is excavated before the left hole via analysis for influence on different excavation sequences on deviation of mid-partition. In addition,the paper analyzes the mechanism of reasonable excavation of the tunnel under the building bias,and the results of research can provide a reference for design and construction of similar tunnels in complicated urban area.