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MODERN TUNNELLING TECHNOLOGY 2017, Vol. 54 Issue (1) :123-129    DOI:
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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)
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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.
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CHEN Kai- 1
2 Ding- Zhi- 2 Gu-Xiao-Wei- 3 Wei-Xin-Jiang- 2 Ge-Guo-Bao- 2
Keywords�� Shield construction disturbance   Metro operation   Consolidation settlement after construction   Distribu? tion of excess pore pressure   Different consolidation degrees     
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.
Keywords�� Shield construction disturbance,   Metro operation,   Consolidation settlement after construction,   Distribu? tion of excess pore pressure,   Different consolidation degrees     
Cite this article:   
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
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