南京建宁西路越江隧道总体设计与关键技术

Overall Design and Key Technologies of Nanjing Jianning West Road Rivercrossing Tunnel Project

南京建宁西路过江通道位于城市核心区,越江段采用双洞六车道大直径盾构隧道方案。结合项目特点,从平面、纵断面及横断面等方面,对隧道总体设计方案进行探讨;并通过理论分析、数值计算及工程类比等方法,对盾构穿越长江堤防抗滑群桩、长距离穿越软硬不均复合地层、穿越浅覆盖粉细砂层及近接既有建(构)筑物掘进等设计施工关键技术问题进行系统研究,优化设计方案,使项目总体功能和施工运营的安全性达到最优。

Nanjing Jianning West Road is located in the city′s core area,and the cross-river section adopts a twinbore six-lane large-diameter shield tunnel.The paper expounds the control factors and construction conditions of the project,and introduces the overall design scheme of the tunnel from the aspects of plane,longitudinal section and cross section.By using theoretical analysis,numerical methods and engineering analogy,the key technologies of design and construction for shield tunnelling through the anti-slip group piles of the Changjiang dyke,the long distance crossing through the mixed stratum of soft and hard rock,the shallow covering of fine sand and the tunnelling close to the existing structures are systematically studied,and the optimized final design option is proposed so that the overall function and safety of construction and operation can be best achieved.