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Ye R.,Ningbo University | Liu G.,Ningbo University | Ye J.,Ningbo Urban Rail Transit Project Construction Headquarter
Advanced Materials Research | Year: 2011

The foundation pit of Fuqing road station is the first one to be excavated in Ningbo urban rail transit project. To ensure the safety of the foundation pit, a detailed monitoring scheme is established according to the engineering geological condition and design scheme of foundation pit. Due to Ningbo city is located in the classical soft clay area, there may occur pre-warning and dangerous condition during the excavation. Therefore, reinforcement of structure and soil is executed from the aspects of designing, construction, supervision and monitoring. At last, the deformation of foundation pit is controlled and the construction safety is ascertained. Furthermore, the information construction is adopted during the excavation and many data are obtained during the process of monitoring, the displacement of diaphragm wall, ground settlement and axial force of the support are analyzed. In addition, the control measures are presented and can provide reference to the future construction of the other stations. © (2011) Trans Tech Publications, Switzerland.

Wang G.,Hubei Engineering University | Wang Y.,Hubei Engineering University | Chen B.,Ningbo Urban Rail Transit Project Construction Headquarter | Yu Y.,Wuhan University of Technology
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2015

In order to investigate the mutual influence of the seismic responses from the underground structure and above ground structure, a computation model containing a system of the tunnel, the ground soil and the adjacent structures was established. The key factors influencing the seismic responses of the system were studied, including the depth and radius of tunnel, the features of layered soils, the height to width ratio of the super structure, the distance from the super structure to the axis of tunnel and the characteristics of the input seismic waves. The calculated results showed that the existence of tunnel had almost no influence on the natural frequency of the system, while the super structure had a significant influence on the frequency character of the system. The main factor of tunnel influencing the super structure was the radius of tunnel because the tunnel with larger radius blocked more prominently the propagation of seismic wave leading to some degree of shock absorption. The influence of super structure on the seismic response tunnel was insignificant because the weight of the super structure considered in the paper was very light. The characteristics of input seismic waves had significant effect on the seismic response of the system due to the frequency contents and frequencies of the super structure. The seismic responses of the system were influenced by the soil properties. ©, 2015, Academia Sinica. All right reserved.

Ye J.,Ningbo Urban Rail Transit Project Construction Headquarter | Liu Y.,Zhejiang University | Liu Y.,Design and Research Co. | Chen R.,Zhejiang University | Tang L.,Zhejiang University
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2014

The excessive upward floating of segment in shield tunnel construction would cause the ring joints stretched, dislocated and segment damaged. At present, there are few researches on the permissible value of upward floating for segment in shield tunnel. By using finite element software ABAQUS, a 3D numerical model for the analysis of upward floating which could consider the impact of dislocation and stretched deformation of spring join was founded. The upward floating deformation at different segments and the deformation of spring joints were analyzed. Results show that upward floating of segment can be divided into three stages:the linearly developing stage, the arc-shaped developing stage and the deformation stabilized stage. The main deformation of joints is dislocation in the linearly developing stage and tensile in arc-shaped developing stage. A formula for the permissible value of upward floating for segment in shield tunnel which is affected by the permissible dislocation value and permissible tensile value of spring joint was obtained. The permissible value of segment upward floating of Ningbo and Shenzhen metro whose structure of segment are different were compared, and result shows that the structure of segment has great impact on the permissible value of upward floating. ©, 2014, Academia Sinica. All right reserved.

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