采用HS土体本构模型,使用有限元方法,以昆山某广场软土深大基坑为例,对围护桩刚度、支撑刚度和坑内加固对围护桩最大水平位移的影响进行了2D分析。分析表明,围护桩刚度和支撑刚度的增大对围护桩水平变形的改善逐渐降低;而坑内加固的宽度、深度和刚度的增加对围护桩最大水平位移的改善呈线性增加,但幅度不大。因此,围护结构的设计存在优化的必要和可能。 Using HS constitutive model of soil, finite element method was used to analyze the influence of the stiffness of retaining pile, supporting stiffness and the maximum horizontal displacement of retaining pile on the maximum horizontal displacement of retaining piles in a deep foundation pit in a square in Kunshan. . The analysis shows that the improvement of the horizontal deformation of the retaining pile decreases with the increase of the rigidity of the retaining pile and the support stiffness, while the increase of the width, depth and rigidity of the reinforcement increases linearly with the improvement of the maximum horizontal displacement of the retaining pile, Not big. Therefore, the design of envelope has the necessary and possible optimization.