Abstract:

No 4 entrance/exit tunnel of Wangjiadun East station on Line 2 of Wuhan Metro is the first tunnel in Wuhan that has been built by rectangular pipe jacking method The authors analyze the influence on the surrounding environment and the ground displacement laws imposed by tunneling by rectangular pipe jacking method by means of field monitoring and threedimensional numerical simulation, with the construction of No 4 entrance/exit tunnel of Wangjiadun East station as an example. Conclusions drawn are as follows: 1) The final ground surface settlement is proportional to the excavation timing of the corresponding crosssection; 2) Ground surface heaving occurs in front of the face of the pipe jacking machine, while ground surface settlement occurs behind the face of the pipe jacking machine; 3) The ground surface settlement decreases as the distance from the rectangular pipe jacking axis increases, and the range of the influence is about 3 times of the tunnel diameter

Key words: rectangular pipe jacking, monitoring during construction, numerical simulation, Metro works, entrance/exit tunnel