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由于路堤荷载下桩承式加筋复合地基的桩体与桩间土之间变形的不协调,引起路堤内部一定高度范围内填土发生相对位移、应力产生重分布。通过对上部路堤填土的受力变形分析,采用极限平衡理论,得到了桩承式加筋复合地基加筋垫层上表面土压力的计算公式。以水平加筋垫层为研究对象,在假定其下凹变形为旋转抛物面的基础上,基于弹性理论,由静力平衡和变形协调条件,考虑桩间土的支撑作用,推导了路堤下桩承式加筋复合地基桩土应力比的计算方法。最后采用该方法对某一现场试验结果进行了验证,理论值与实测值吻合较好,表明了文中计算方法的可行性。
Due to the uncoordinated deformation between the piles and the soil between the piles under the embankment load, the relative displacement of the fill within a certain height within the embankment is caused and the stress is redistributed. Based on the analysis of the stress and deformation of the embankment in the upper embankment and using the theory of limit equilibrium, the formula for calculating the earth pressure on the upper surface of the reinforced composite foundation with pile-supported stiffeners was obtained. Based on the elastic theory, considering the supporting effect of soil between the piles and the static equilibrium and the deformation, based on the assumption that the concave deformation is a paraboloid of revolution, Calculation method of pile - soil stress ratio of reinforced composite foundation. Finally, this method is used to verify the results of a field test. The theoretical and measured values agree well with each other, which shows the feasibility of the calculation method.