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根据路堤荷载下复合地基的变形特征,将柔性基础下复合地基分解为填土、垫层、复合地基、下卧层土体4部分。将4者作为一个共同作用的系统,假设桩土界面之间存在相对滑移且同一水平面上地基土沉降不同,考虑系统4部分交界面上的应力与变形协调,通过对典型单元体的分析,推导了表征柔性基础下复合地基性状的桩土应力比和沉降变形的求解公式。最后将工程实测结果和本文方法分析的结果进行对比,二者基本一致,说明本文方法能较好反映柔性基础下复合地基的工作性状。
According to the deformation characteristics of the composite foundation under the embankment load, the composite foundation under the flexible foundation is decomposed into four parts of soil, cushion, composite foundation and underlayer. Taking the four as a synergistic system, assuming that there is relative slip between pile-soil interface and different subsidence of foundation soil on the same horizontal plane, considering the coordination of stress and deformation at the interface of the four parts of the system, through the analysis of typical unit body, The solving formula of pile-soil stress ratio and settlement deformation which characterize the behavior of composite foundation under flexible foundation is deduced. Finally, the measured results of the project and the results of the method of this paper are compared, the two are basically the same, which shows that the method in this paper can better reflect the working characteristics of the composite foundation under flexible foundation.