The Deep Foundation Pit Of Subway Support Optimization Design And Numerical Simulation Of Wuhan

Deep foundation pit support design is a hot topic in the field of urban construction, is also the difficulty. The safety of foundation pit and not directly related to the success or failure of the whole project. In recent years, the deep foundation pit engineering in our country, both have made great progress in design theory and design level. With the rapid development of urban underground space, the difficulty of design of foundation pit engineering construction is increasing, which leads to a substantial increase in cost, in order to ensure the scientific and reasonable design scheme of foundation pit, it is necessary to foundation scheme selection.In this thesis, according to the geological environment of Wuhan city subway surrounding, to determine the construction scheme of supporting with pile anchor combination, and using the finite element method and the increment method of foundation pit supporting design calculation. In this paper, using Midas/GTS calculation and Simulation of stress, strain and displacement of foundation pit. The main research works are as follows:(1) through summarizing predecessors’ research results, according to the common construction method in metro construction, determine the actual form of subway excavation.(2) according to the scope of application and common support form the advantages and disadvantages, according to the analytic hierarchy process to select the actual form of foundation pit supporting;(3) By using the finite element software(Midas/GTS) dynamic 3D model to simulate the excavation process, the stress condition, two kinds of different design scheme of the support and to determine the best scheme of supporting design, and we can get the best supporting scheme results are meet the relevant standard of internal force and displacement of the foundation pit design requirements.(4) Bolt through the use of different layout of the number of anchor bolts of foundation pit support effect, and can be seen clearly, affect the safety of foundation pit anchor arrangement.The excavation of deep foundation pit is, at the same time using a variety of different forms of support in a foundation pit, and the use of finite element simulation has achieved good results, provide a reference for future similar projects in Wuhan area, it has guiding significance for the results.