Tunnel face stability and ground settlement in pressurized shield tunnelling
来源期刊：中南大学学报(英文版)2014年第4期
论文作者：SU Yi(苏艺) WANG Guo-feng(汪国锋) ZHOU Qing-hong(周庆宏)
文章页码：1600 - 1606
Key words：settlement; large-diameter shield tunnel; three-dimensional failure mechanism
Abstract: An analysis of the stability of large-diameter circular tunnels and ground settlement during tunnelling by a pressurized shield was presented. An innovative three-dimensional translational multi-block failure mechanism was proposed to determine the face support pressure of large-shield tunnelling. Compared with the currently available mechanisms, the proposed mechanism has two unique features: (1) the supporting pressure applied to the tunnel face is assumed to have a non-uniform rather than uniform distribution, and (2) the method takes into account the entire circular excavation face instead of merely an inscribed ellipse. Based on the discrete element method, a numerical simulation of the Shanghai Yangtze River Tunnel was carried out using the Particle Flow Code in two dimensions. The immediate ground movement during excavation, as well as the behaviour of the excavation face, the shield movement, and the excavated area, was considered before modelling the excavation process.
SU Yi(苏艺)1, WANG Guo-feng(汪国锋)1, ZHOU Qing-hong(周庆宏)2, 3
(1. Beijing Railway Construction and Management Co., Ltd., Beijing 100037, China;
2. School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China;
3. Haikou Forest Farm, Kunming 650114, China)
Abstract:An analysis of the stability of large-diameter circular tunnels and ground settlement during tunnelling by a pressurized shield was presented. An innovative three-dimensional translational multi-block failure mechanism was proposed to determine the face support pressure of large-shield tunnelling. Compared with the currently available mechanisms, the proposed mechanism has two unique features: (1) the supporting pressure applied to the tunnel face is assumed to have a non-uniform rather than uniform distribution, and (2) the method takes into account the entire circular excavation face instead of merely an inscribed ellipse. Based on the discrete element method, a numerical simulation of the Shanghai Yangtze River Tunnel was carried out using the Particle Flow Code in two dimensions. The immediate ground movement during excavation, as well as the behaviour of the excavation face, the shield movement, and the excavated area, was considered before modelling the excavation process.
Key words:settlement; large-diameter shield tunnel; three-dimensional failure mechanism
