ABSTRACT
With the development of building technology, the speed of urban development is accelerated, the city scale continues to expand, with the rapid expansion of population, A lot of abuses have emerged. Such as land tension, crowded living space, traffic congestion, backward infrastructure, ecological imbalance, environmental deterioration and other problems, the rational development of underground space can not delay. China has lifted boom of urban underground space development and construction, such as underground mall, underground railway, the comprehensive utility tunnel, underground parking, national defence engineering construction, which inevitably engineering problem is the study of the retaining structure of deep foundation pit engineering, is now a project is critical in the process of conducting a content, need to give a high degree of attention, because of the deep foundation pit supporting structure, when the design is too conservative, produce waste, so is the necessity of optimization. Therefore, this paper gives a detailed analysis on the optimization design of deep foundation pit excavation support structure for subway construction.
