The Influence Of Deformation Of Deep Foundation Pit Supporting Structure On Horizontal Displacement Of Surrounding Environment

As the development and utilization of urban underground space and the development of high-rise buildings, the foundation pit engineering is developing towards to the deep and huge excavation. However, deep foundation pits are normally in the center of city, where the building density is high, the construction site is rather narrow, and a lots of existing foundations surround the new pits. The conventional foundation pit design theories and routine construction technologies are no longer suitable for the safety of the deep excavation and the surrounding environment. Although, recent years a lot of scholars and engineers conducted many researches on the deformation control of deep excavations, there are still a lot of problems needed to be solved.This thesis based on a deep foundation pit project in Beijing which has typical engineering geological condition, simulated the whole excavation process of this pit using MIDAS/GTS. The row of piles is equivalent to diaphram wall according to the stiffness, and simulated the deformation of pile row under different anchor layers and stiffness, in order to simulate the level displacement of the tops of support structure, the support structure displacement variations, the level of soil displacement behind wall, and get deep foundation pit engineering design and construction engineering significance conclusion, As a result the deformation law is summarized by the numerical simulation.The main research contents are as follow:(1)simulated and analyzed the deformation rules of diaphram wall with no anchor and1-4rows of anchors;(2)changed the thickness of the diaphram wall to0.4m,0.6m and0.8m, and simulated the deformation rules of diaphram wall in the circumstances described in (1);(3)analyzed the stresses of anchors according to the monitored data, and verified the conclusions derived from the numerical simulation.