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Analysis of the Influence of Foundation Pit Construction on
an Operating Metro Tunnel Based on Field Measurement
(1 Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015;
2 College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058)
Abstract An underground passage passes over the existing shield-driven tunnel of the Hangzhou Metro line 1. Due to the complex geological conditions and surrounding environment of the over-passing section, tunnel deformation has to be strictly controlled. For this reason, control measures like foundation reinforcement and sectional excavation are considered in the tunnel design. Based on the monitoring data from the pile foundation construction and foundation pit excavation, this paper analyzes the rules and characteristics of the vertical displacement, horizontal displacement, and convergence of the shield-driven tunnel at different construction stages. The results show that the pile foundation construction may cause vertical settlement of the tunnel (maximum: 5mm), but has little influence on the horizontal convergence; additionally, foundation pit excavation may cause tunnel floating (maximum: 5mm) and horizontal radial convergence, but has little influence on the horizontal displacement.
Abstract：
An underground passage passes over the existing shield-driven tunnel of the Hangzhou Metro line 1. Due to the complex geological conditions and surrounding environment of the over-passing section, tunnel deformation has to be strictly controlled. For this reason, control measures like foundation reinforcement and sectional excavation are considered in the tunnel design. Based on the monitoring data from the pile foundation construction and foundation pit excavation, this paper analyzes the rules and characteristics of the vertical displacement, horizontal displacement, and convergence of the shield-driven tunnel at different construction stages. The results show that the pile foundation construction may cause vertical settlement of the tunnel (maximum: 5mm), but has little influence on the horizontal convergence; additionally, foundation pit excavation may cause tunnel floating (maximum: 5mm) and horizontal radial convergence, but has little influence on the horizontal displacement.
WEI ,
Gang-1,
Li etc
.Analysis of the Influence of Foundation Pit Construction on
an Operating Metro Tunnel Based on Field Measurement
[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(1): 179-185
2014, Vol. 51 