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当前的深基坑工程设计多以变形控制为主。对于特定地层条件下,增加支护结构体系的整体刚度是控制基坑变形的主要途径。提高围护结构的抗弯刚度可以降低基坑的变形,且通过增加围护结构刚度的方式来控制变形,不会对基坑后续施工产生影响。借助PLAXIS2D有限元软件,并采用土的HS本构模型,系统研究了悬臂支护、单支点支护以及多支点支护条件下,支护桩墙抗弯刚度对基坑最大水平位移和最大地表沉降的影响规律。通过对不同支撑条件下,抗弯刚度对变形的影响规律总结分析,为深基坑支护变形控制优化设计提供参考。
The current engineering design of deep foundation pit is dominated by deformation control. For a given formation, increasing the overall stiffness of the supporting structure is the main way to control the deformation of foundation pit. Increasing the flexural rigidity of the envelope can reduce the deformation of the foundation pit and control the deformation by increasing the stiffness of the envelope, which will not affect the subsequent construction of the foundation pit. With PLAXIS2D finite element software and HS constitutive model of soil, the maximum horizontal displacement and the maximum ground surface of the foundation pit under flexural stiffness of the retaining wall under cantilever support, single-point support and multi-support conditions are systematically studied. The law of settlement. By summarizing and analyzing the rule of the influence of the flexural rigidity on the deformation under different supporting conditions, it provides a reference for the optimal design of the deformation control of the deep foundation pit.