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地铁工程双岛四线同站台换乘可以在两个相邻车站实现两条地铁线路八个方向的客流交换,采用该种换乘方案的地铁区间,必然面临同一个区间存在四条隧道先后施工的难题。本文研究了软塑状粉质黏土及富水砂砾石层中空间交叠隧道掘进的变形特征,提出了基于盾构施工功法的加固方案及构筑物保护方案,解决了小净距空间交叠隧道施工对地层反复扰动带来的变形控制及成品隧道、市政桥梁保护等难题,并在工程实践中获得成功,取得较好的社会经济效益。
Metro project Shuangdao four lines with the station transfer can be achieved at two adjacent stations in eight directions of the two subway lines passenger exchange, the use of such a transfer program of the metro section, bound to face the same interval there are four tunnel construction problem. In this paper, the deformation characteristics of space-overlap tunneling in soft-plastic silty clay and water-rich sand gravel layer are studied. The reinforcement scheme and structure protection scheme based on shield construction work method are put forward to solve the problems of small clear space overlapped tunnel Construction of the formation deformation caused by repeated disturbance control and finished tunnels, municipal bridges and other issues of protection, and success in engineering practice, and achieved good social and economic benefits.