Numerical Simulation Of Deep Foundation Pit Support System In Loess Area

With the continuous development of underground space in China,various accidents of foundation pit instability and failure have emerged one after another,especially the instability and failure of deep foundation pit will cause heavy casualties and property losses.The stability of deep foundation pit is affected by many factors.In order to achieve the stability of foundation pit,the installation support system is widely used in engineering.Therefore,it is very necessary to explore the stability of deep foundation pit under the action of support system.Firstly,this paper summarizes the development process of foundation pit engineering at home and abroad,the research status,action mechanism,advantages and disadvantages and scope of application of pile anchor support structure,so as to lay a theoretical foundation for the subsequent selection of foundation pit support scheme.Based on the case study of Yangong project and the surrounding foundation pit,this paper puts forward the construction form of Yanming tower based on the information of the previous project.Secondly,the support system of the whole foundation pit is designed by Lizheng deep foundation pit software,and the changes of foundation pit horizontal displacement,settlement and other information with excavation are calculated.Then verify the correctness of the FLAC3 d model and the reliability of the flad software.The stability of the design scheme under traffic load is calculated by setting dynamic loads with different vehicle weights and different action distances.Finally,the static stability of foundation pit under different prestress and different anchorage length and the stability under dynamic load are explored,and the design scheme is optimized.