Research On Numerical Simulation Of Cement Soil Pile Wall And Rotary Shotcrete Bolt Support Structure In Deep Foundation Pit

With the accelerated pace of China’s urbanization, infrastructure to a new level, and deep foundation pit project as an old topic, today has a new significance. The development and utilization of underground space resources have promoted the development of this project, but the foundation pit engineering is restricted by the surrounding environment. The environment is more and more strict in the design and construction of foundation pit engineering. Cement soil pile wall as a fast and simple, high reliability of the foundation pit support technology, more and more applications to the deep foundation pit support engineering. The use of cement soil pile wall generally adopts the combination of cement soil pile wall + support or anchor cable and other forms of support. But at present, the theoretical research on the function mechanism and the character of the composite support form is behind the engineering practice.This paper first comprehensive understanding of the characteristics of deep foundation pit engineering, and the existing deep foundation pit support structure form to carry on the summary. In deep foundation pit excavation engineering example based, the use of software of Lizheng deep foundation pit supporting structure design calculation, based on introducing the finite element theory and using the finite element software MIDAS/GTS according to the actual conditions of the project, the 3D deep foundation finite element analysis model is established. This project excavation support sequence is simulated, which is more intuitive analysis and summary of the excavation of deep foundation pit soil during the process of force, displacement, foundation pit heave, the surrounding ground settlement regularity. Through the finite element engineering simulation results with Lizheng design results to verify the finite element numerical simulation result is more close to the actual situation of the construction, which can be a reference for practical engineering. Finally through changing the supporting height of the structure and layout of the form of affection on the supporting structure stability factors were studied to verify the rationality of the design of foundation pit, which for supporting structure design, construction and reasonable arrangement has important significance.