Analysis On The Security Of Cofferdam And Foundation Pit With Open-cut Method In The Construction Of The Channel

In recent years, with the rapid development of economy, more and more people are flocking to the city, and it leads to increase of city traffic pressure. The use of the ground space already cannot satisfy people s requirement of transportation and the environment, the development and utilization of underground space has been rapid development in various countries and regions. Construction method of underground space are mainly cut method, cover cut method, subsurface excavation method, the safety of the supporting structure is reliable guarantee of these engineering. If there is no in-depth analysis and research of them, will cause great harm to the construction. And the soil is an extremely complex material, the change of uncertain factors such as the underground water level, the surrounding environment, and so on, will influence the changes of state of the stress, so the research on analysis of geotechnical structure is a complicated process.This paper takes East Lake channel as the engineering background, the channel construction of double wall steel sheet pile cofferdam retaining structure is analyzed. Using the finite difference software FLAC3D to simulate the stress state of the steel sheet pile cofferdam in construction process, based on the calculated results, analyze the strength, stiffness and stability, provide scientific advice for the safety of construction. The main works are as follows:1Analyze engineering content and geological conditions of the corresponding engineering, the cofferdam structure design are given in accordance with the content, as well as the corresponding cofferdam construction process, in order to ensure the safety of the project.2Detailed expounds the elastic-plastic constitutive relation of soil, and combined with the actual situation of the background project, determine the model parameters of the soil and the corresponding force of the structure, using FLAC3D to establish numerical element model consistent with the actual project.3Combined the actual construction sequence of the background engineering, according to the underground water level difference and the soil change caused by excavation of foundation pit, established numerical model under different working conditions of steel plate pile cofferdam under different working conditions for simulation analysis, simulated analysis of steel plate pile cofferdam.4. The model of the structure under the post-processing, extract relevant data calculation results, evaluate the strength, stiffness and stability of the double-wall steel sheet pile cofferdam.