单、双排桩联合支护衔接处结构尺寸影响分析

Analysis on the Influence of Structural Size at the Joint of Single and Double Row Pile Combined Support

为保障相应基坑工程的支护结构刚度和稳定性,采用双排桩和单排桩联合支护的形式,并利用ANSYS有限元软件建立双排桩和单排桩衔接处局部基坑支护实体模型,通过调整双排桩排距、双排桩桩距和衔接处有无冠梁等情况,分析联合支护衔接处结构尺寸对桩体位移和弯矩的影响。结果表明:双排桩排距增加可以提高结构稳定性;双排桩桩距增加会降低结构稳定性;衔接处冠梁可以提高单排桩的支护效果。可为该类基坑支护问题提供参考。

In order to ensure the stiffness and stability of the supporting structure of the corresponding foundation pit engineering,the form of combined support of double row piles and single row piles is adopted,and the solid model of local foundation pit support at the joint of double row piles and single row piles is established by using ANSYS finite element software.By adjusting the row spacing and the pile spacing of double row piles,and whether there is a crown beam at the joint,the influence of the structural size at the joint of combined support on the displacement and bending moment of piles is analyzed.The results show that the increase of row spacing of double row piles can improve the structural stability.The increase of double row pile spacing will reduce the stability the structure.The crown beam at the joint can improve the support effect of single row piles.The conclusions can provide some reference for this kind of foundation pit support.