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基于复合地基等应变条件下应力和位移的精确解,得到了桩土应力比、沉降比、径向位移和桩土侧压力系数等的计算公式。分析了它们随桩土压缩模量比和置换率的变化规律,并在分析过程中与Priebe法做了比较,详细分析了Priebe法中所做假设对计算结果的影响。分析表明,Priebe法中忽略桩体体积应变的假设会带来较大的误差,而针对径向变形计算和桩土侧压力系数的假定由于影响的相互抵消作用,其综合影响不一定很大。
Based on the exact solution of stress and displacement under strain conditions such as composite foundation, the formulas of stress ratio, settlement ratio, radial displacement and lateral pressure coefficient of pile-soil are obtained. The comparisons between them and the Priebe method are analyzed in the analysis of the variation law of the compressive modulus ratio and displacement rate of the pile soil. The influence of the assumptions made in the Priebe method on the calculation results is analyzed in detail. The analysis shows that the assumption of ignoring pile volume strain in Priebe method will lead to large errors. However, the assumptions about the radial deformation calculation and the pile-soil lateral pressure coefficient are not necessarily large due to the effect of mutual offset.