The Research On Optimization Of Soil-nail Wall Supporting Of Several Typical Foundation Pit In Beijing

As a new international metropolis——eijing with many high and larger scale buildings, much more underground space are used. How to make the security and economic coincidence on excavation support project will become the major engineering problems in Beijing.This paper mainly focuses on the research of the optimization of soil-nail wall supporting of several typical foundation pit in Beijing. Firstly introduces the common foundation pit supporting way in Beijing. Next, summarizes the soil and soil classification through the analysis of the factors such as geographic orientation、 geologic structure、geological formation. At last, the software MIDAS GTS and FLAC3D were compared as the background of a soil nailing wall project, the results showed that the FLAC3D model is more accurate. the optimal theory and analysis according to the soil layer in western area of Beijing it established and got the most economic and optimal scheme to meet the requirement of engineering effective and economic through three steps:the control of the safety coefficient and horizontal displacement the tensile stress control of soil nail; the control of the cost. Finally, the numerical simulation and scheme optimization for two typical zone are carried out. The soil nailing wall commands in FLAC3D and the excel cost table presented in this paper have general application ranges, they were allowed to spread to other engineering and helped to making the preliminary design and cost estimation.