Reserch On The Pressure And Deformation Of Annular Bracing Row Piles Structure Within Soft Soil

With the continuous development of China’s reform and opening-up process and the urbanization process, available earth in city became rare. The geological conditions of foundation pit are becoming more and more complicated and the number of excavation in soft soil is increasing. As for soft soil, a lot of research has been done both at home and abroad. Soft soil characteristics have basically been cognition.Although the existing theory of foundation pit engineering could generally guide the actual design and construction of excavation in soft soil, the incomplete theory of foundation pit in soft soil would cause the conservative design. The stiffness of ring inner support needs to be determined through linear elastic analysis. It will increase the workload and slow the progress of the design. Thus, based on the theoretical derivation and practical engineering, an analysis has been carried on the pressure and deformation of internal bracing row piles structure within soft soil. The main works of this article are as follows.Summarizing the current research and application results of row piles structure and comparing the design specification both at home and abroad.The article will put forward a calculation method of the ring brace stiffness. A calculation model suitable for the pile in soft soil foundation will be presented on the basis of the existing method for calculating the pile supporting structureOn the background of practical engineering, the article will establish corresponding elastic bar system model, the overall plane strain model, and the three-dimensional model by comparing the curve of supporting structure displacement, in order to verify validity of the ring brace stiffness calculation. It can simplify the design of annular bracing excavation.The article discusses the influence factors of embedded depth of soft soil foundation pit and finds the specification leads to conservative design. The article will compare the impact of several common foundation improvement measures on the displacement of foundation pit.