针对基坑支护中深层搅拌桩墙围护结构出现的开裂，采用Mindlin厚板理论对其受力与变形性状进行弹塑性分析，建立了墙体的厚板力学模型和三维有限元分析模型，并编制了有限元分析程序；基于墙体受到纵向弯矩、横向弯矩和扭矩的综合作用，提出采用等效弯矩法评价墙体的综合抗弯性能；利用所编制的程序，获得了某基坑深层搅拌桩墙围护结构墙体水平位移和等效弯矩的空间分布规律；计算结果表明，墙体东侧环球广场横向支撑附加力的作用是使墙体形成破裂面的主要原因。

Aiming at the cracks of supporting structure of deep mixing wall, the elastoplastic behavior of internal force and deformation of deep mixing wall is analyzed in this paper. According to Mindlin plate theory, the thick plate model and three dimensional finite element model of wall are set up. Considering vertical and horizontal bending moment and tortile moment action together, equivalent bending moment is proposed in this paper to evaluate anti-bend capability of wall. Using the program developed by authors, spatial shape of horizontal displacements and equivalent bending moments of wall of supporting structure of deep mixing wall are gained. The calculation results indicate that the cracks of wall are mainly caused by strut´s loads of Huanqiu Plaza beside east of wall.