Nonlinear Finite Element Analyses Of Spatial Effects On Double-row Pile Retaining Structures

As a new retaining form, double-row pile retaining structure has many advantages, such as reducing supports and increasing working face of construction. In the recent years, it was widely applied in engineering. But the stress mechanism is not clear, and the calculation method is not mature. Especially, how to consider the influence of spatial effect effectively in design needs further research demonstration. Therefore, the spatial effect on double-row retaining structures of deep foundation pit is analyzed with nonlinear finite elements in this paper.Firstly, the main features and research status of double-row pile retaining structures are described in this paper. Secondly, based on the large finite element software PLAXIS which is used in this paper, the principle of finite element analysis is introduced. Through simulating the spatial effect on double-row pile retaining structures of deep foundation pit and changing the parameters, such as the excavation depth, the length-width ratio of the foundation pit, the array pitch of the double-row piles, the diameter of the piles and the stiffness of the connections, the variation of the deformation, the moment and the earth pressure of the piles are analyzed. Finally, some conclusions with reference values are obtained in this paper.Based on the results of the finite element analysis, the deformation and stress characteristics of the piles around the foundation pit are concluded. The reasonable value ranges of parameters in double-row pile retaining designs are put forward. And some suggestions with guiding significance for engineering practice are proposed for the calculation method of earth pressure in design.