Tunnel under the river and cherry wearing Satsuki West Bridge Engineering and numerical treatment measures
|School||Central South University|
|Course||Architecture and Civil Engineering|
|Keywords||ground surface settlement numerical simulation finite difference method shallow tunnel construction|
The problem of ground surface settlement caused by construction on the tunnel has been made a lot of research results. In recent years, as shallow tunneling method is widely used in the range of underground engineering, the studies of ground deformation due to the tunnel are more and more published. In an urban environment, skyscrapers and elevated bridge are highly concentrated, which many are located in the piles or strip foundations. Tunnel construction will almost inevitably lead to the deformation of soil. As the result, the deformation of soil will be imposed the lateral force on the bridge above the base, affect the deformation and internal forces on the pile. Meanwhile, as the tunnel needs crossing the river and the bridge foundation, lowering the water level should be done before excavation, and additional settlement affected by lowering the water level will produce. At present, the literatures in these areas are relatively small, needed for in-depth research.Based on this, this paper, in connection with the practical engineering problems with a tunnel through the XiaoYue River and the YingHua West Bridge, has been used the finite difference software to carry out a detailed numerical simulation on subway tunnel construction. This paper also has studied the influence of ground deformation due to shallow tunneling method which is used in subway and the influence of the bridge base due to metro construction. Finally, this paper proposes a program of the way to through the construction of bridge foundation.This article includes the following aspects:1) Fluid solid couple calculation of the bridge foundation and ground surface settlement caused by tube well dewatering is calculated.2) Numerical simulation of the construction process is analyzed by the finite difference software. The influence of ground stress-strain due to shallow tunneling method is also analyzed. Finally, treatment program was put over according to numerical results.3) Considering the subway tunnel and bridge location-based relationship and the construction design, the paper simulate and predict the impact of the tunnel crossing beneath the bridge, such as evaluation of surface subsidence, the bridge-based deformation and differential settlement. And against the risk of danger, this paper presents the corresponding processing program.