Discussion on Design Method of Single Point Pile-anchor Supporting Structure

In order to optimize the design of single-point pile-anchor support for deep foundation pit, both safety reliability and economic rationality should be guaranteed. Based on an engineering example, static equilibrium method, equivalent beam method, elastic fulcrum method and finite element method were used respectively to calculate the internal force, displacement, minimum soil depth, anchorage force and ground settlement around the foundation pit. The results show that: the internal force of supporting pile calculated by static equilibrium method and equivalent beam method is the largest, then elastic fulcrum method, and smallest by finite element method. In the displacement analysis of the supporting pile, the elastic fulcrum method is used to simulate the deformation of the supporting structure, but the finite element method is more in line with the actual deformation of the supporting pile. As for surface settlement, the results calculated by "m" method are basically consistent with the results of finite element analysis.