Abstract:

The modification of the large diameter slurry shield originally used in Yangtze River tunnel in Wuhan is presented in this paper. The diameter of this shield is enlarged. The modified slurry shield is to be used to bore Qiangtang River tunnel at Qingchun Road in Hangzhou. The modification program and the problems occurring during the modification are presented on basis of analysis on the geology applicability and economic and technological feasibility of the shield. The tunneling effects of the modified slurry shield show that the prevention measures taken in the modification are effective. Furthermore, some shortcomings of the modification are summarized. The paper can provide reference for further studies in the future.

Key words: Yangtze River Tunnel in Wuhan, slurry shield, geology applicability, feasibility analysis