Prediction Method for Surface Settlement in Tunnel Construction with Pipe Curtain Support
（1 School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031; 2 Fuzhou Municipal Construction Development Co.,Ltd, Fuzhou 350108; 3 FujianFuzhou Planning Design & Research Institute, Fuzhou 350108）
Abstract：
Pipe jacking construction for pipe curtain will disturb stratum and cause deformation and surface settle?
ment. At present the surface settlement caused by group pipes is calculated by superposition of single pipe settlement without consideration of the interaction of group pipes of pipe curtain. Taking the pipe curtain at exit section of Wenlinshan tunnel for example, which is constructed by the technology of mucking with screw conveyor and jacking with casing, a calculation method for the surface settlement of single-pipe jacking construction considering ground loss and construction stress is established based on stochastic medium theory and Mindlin solution, and the modified function for the surface settlement of group pipe construction is introduced to set up a calculation method for the surface settlement of group pipe construction; the change and distribution laws of surface settlements caused by single-pipe jacking and group pipe construction are analyzed and verified by the proposed calculation method and FLAC3D numerical simulation respectively. The results show that: (1) during the jacking process of steel pipes, at
first the surface heaves in front and then subsides in the rear; (2) the surface deformation caused by steel pipe jacking gradually attenuates from the center line of the tunnel to both sides, with the affected scope within 12 m of the two sides; (3) the surface heaving caused by the subsequent pipe jacking is smaller than that caused by the first steel pipe, and the surface settlement is larger than that caused by the first steel pipe.
JIANG Yongtao1 WANG Mingnian1 ZHANG Yiteng1 YU Li1 JIANG Fan2 XIAO Zerong3
.Prediction Method for Surface Settlement in Tunnel Construction with Pipe Curtain Support[J] MODERN TUNNELLING TECHNOLOGY, 2020,V57(4): 82-90
2020, Vol. 57 