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基坑围护结构内侧预留土可有效减小围护结构内力和变形,且设置灵活,在工程中应用日益广泛。为了分析坑内预留土对多支点支护结构的作用效应,首先,基于三参数地基弹性梁模型,根据支护结构沿竖向受力模式的不同,给出了一种考虑坑内预留土作用影响的计算分析模型及控制方程组;在此基础上,通过桩身离散和矩阵传递法,推导建立了多支点支护结构内力变形计算的矩阵表达式,并给出半解析解答方法;最后,采用该方法对工程实例进行计算,并对坑内预留土设置宽度、高度的影响规律进行了分析,验证了方法的可行性,可为支护工程设计施工提供参考。
The reserved soil inside the retaining structure of the foundation pit can effectively reduce the internal force and deformation of the retaining structure and has the advantages of flexible setting and increasingly wide application in engineering. In order to analyze the effect of the reserved soil in the pit on the multi-support structure, firstly, based on the three-parameter foundation elastic beam model and according to the different vertical bearing modes of the support structure, Based on this, the matrix expression of the calculation of internal force deformation in multi-fulcrum support structure is deduced by pile body dispersion and matrix transfer method, and the semi-analytical solution is given. Finally, The method is used to calculate the engineering example. The influencing rules of the width and height of the reserved soil in the pit are analyzed. The feasibility of the method is verified and the reference can be provided for the design and construction of the support engineering.