Study On The Stability Of The Foundation Of Xi’an Da Yan Ta Station Excavation Pit

With the rapid development of cities, urban underground space development and utilization is becoming the most important way to solve urban traffic congestion problems, which makes a lot of deep excavation come out. The subway stations deep excavation is an important part of that, in relate to excavation construction technology and deformation law has a very important practical application.This paper, relying on Xi’an Dayan Ta railway transfer station of the third and fourth line deep excavation, combining the effective construction technology, theoretical research methods, field measurement and numerical method, researches and analyses the resulting deformation of deep foundation construction technology. Firstly, combined with Xi’an Dayan Ta railway station excavation, it analyzes the characteristics of the deep excavation construction pitted and the excavation structure theory. Then the paper,based on the actual construction of deep foundation pitted, analyzes heavy and difficult issues encountting in the construction of deep foundation pitting,and makes appropriatly responsible measures. Finally, the article focuses on the use of FLAC3 D dimensional finite element numerical simulation software for deep excavation and support the whole process simulation, respectively discusses the impact of foundation pit piles of different diameter and buried depth, and analyses deep foundation excavation step in the process of stress envelope structure, surface pit horizontal displacement and deformation law around the settlement, combined with field data comparative.