Numerical Analysis of Post-Construction Subway Settlement and Variation of Pore Pressures under the Influence of Construction Disturbance
(1 Zhejiang Institute of Communications, Hangzhou 311112; 2 Department of Civil Engineering, Zhejiang University City College,Hangzhou 310015; 3 Hangzhou MTR, Hangzhou 310017)
Abstract��
At present, the subsoil deformation and pore pressure variation caused by metro construction have re?
ceived extensive attention. Based on the Henkel pore pressure theory under three-dimensional stress conditions, the initial excess pore pressure at a tunnel spring line was obtained. The post-construction consolidation of the Hangzhou metro was simulated through the establishment of a three-dimensional finite-element model by MIDAS-GTS,and the subsoil settlement and distribution of the pore pressure at different time periods due to construction disturbance was analyzed. The results show that: the distribution of excess pore pressure is symmetrical and its dissipation is consistent with the subsoil consolidation degree after construction; consolidation settlement mainly occurs at the beginning of shield tunnelling and reaches a maximum at the ground; and the variation of pore pressure caused by metro operation decreases with an increase of the consolidation degree.
CHEN Kai- 1,
2 Ding- Zhi- 2 Gu-Xiao-Wei- 3 Wei-Xin-Jiang- 2 Ge-Guo-Bao- 2
.Numerical Analysis of Post-Construction Subway Settlement and Variation of Pore Pressures under the Influence of Construction Disturbance[J] MODERN TUNNELLING TECHNOLOGY, 2017,V54(1): 123-129
2017, Vol. 54 