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根据条形基坑的变形特征,构造出含有待定参数并满足边界条件的支护墙变形方程,将支护墙、内支撑及坑底土体视为共同作用的系统,采用土弹簧模拟被动区土体与支护墙的相互作用关系,考虑了主动土压力与墙体变形的非线性相互作用,基于最小势能原理推导出支护墙侧向变形的计算公式。结合工程实例对基坑的变形进行了分析,计算结果与监测结果吻合较好,表明所得变形解析公式能较好地反映支护体系的工作性状。
According to the deformation characteristics of the strip foundation pit, the deformation equations of the retaining wall which contain the parameters to be determined and satisfy the boundary conditions are constructed, and the supporting walls, the inner supports and the bottom soil are considered as the joint systems. The soil springs are used to simulate the passive zone The interaction between soil and retaining wall is taken into account. Considering the nonlinear interaction between active earth pressure and wall deformation, the formula of lateral deformation of retaining wall is derived based on the principle of minimum potential energy. The deformation of the foundation pit is analyzed with the engineering example. The calculation results are in good agreement with the monitoring results, which shows that the deformation analysis formula obtained can well reflect the working characteristics of the support system.