Optimization Design And Numerical Simulation Analysis Of Foundation Pit Supporting Of Urban High-rise Building

With the acceleration of urbanization process in China, more and more high-rise and ultra-high-rise buildings have been built and the excavating depths of foundation pits have also increased. The lack of urban land and surroundings environment of building foundation pit become more and more complex at the same time. When carrying out large-scale excavation and supporting, foundation security becomes an urgent problem to be solved. How to design a safe, reasonable and feasible foundation pit supporting plan has become a common concern issue both in China and abroad.The optimization project design is the key of foundation pit support. Due to improper internal forces calculation or deformation control, many foundation pit accidents have occurred. That would cause engineer design conservative, waste and construction investment increase. On the contrary, it would lead to design failure and engineering accidents occurred, causing greater economic losses.Based on previous research, the paper makes use of optimal design theory and focuses on basic principles of deep excavation engineering optimization design. The paper combined with MIDAS/GTS and researched on finding a scientific and rational decision-making method. It gives comprehensive and reasonable analysis on the optimization of pit design. I put forward my own opinions and by this guide better engineering design and practice.In this paper, after establishing optimization and select optimum, we build models for different kind of support designs respectively, and considering support position comparative analysis of retaining structure(piles) deformation and the influence of surrounding ground subsidence. To analyze the impact of inner support on deformation and further optimize the design parameters so that it is safe, reasonable and economical. The paper has important theoretical and practical significance for solving problems of current excavation engineering design and construction as well as improving the economic and social benefits for enterprise.