Mechanism Analysis And Design Optimization Of Diaphragm Wall Bolting To The Deep Foundation

With the development of our national economy, our country’s urbanization is getting faster. Tall buildings are increasing and public transportation network is more and more intensive. And at the same time, more and more high-rise buildings are on sides of the railway lines, which has leaded to the foundation of complex and large deep pits. The characteristics of the foundation pits are large excavation depth, complex forms, difficult bolts support and so on. It has put forward a severe challenge to the current support theory and technology. On the other hand, the design and research of the complex deep foundation pit are an issue which gets a lot of attention now.So in this thesis, the numerical simulation analysis method is used to research and optimize the deep foundation pit wall and anchor bolt support technology. The aim is to provide theoretical basis for the design of the complex deep foundation pit, and at the same time, it is helpful in excavation engineering. The main contents are as following:(1) The structure of the deep foundation pit wall and anchor bolt support is numerical analyzed by the FLAC3 D software. As an example, model is built based on the west traffic hall of the CBD in Beijing, which is used to simulate the force and deformation of the wall and anchor supporting. Rules of the walls’ deformation and anchors’ stress are also analyzed.(2) For the supporting effect, the influence of the bolt anchorage length, incidence angle and other parameters is analyzed. The parameters are optimized, and the reasonable range of each parameter is given.