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针对竖向增强体-水平增强体-桩间土的整体相互作用特点,将水平向加筋垫层视为具有一定刚度的板,竖向桩体及桩间土简化为刚度不同的弹簧系列。以单个竖向桩体影响范围内的复合地基作为典型单元体进行分析,基于Winkler弹性地基圆板理论推导出水平加筋体的挠曲函数表达式,导出双向增强体复合地基桩土应力比计算式。最后对某工程算例进行计算分析,对路堤荷载大小、工后沉降值、面积置换率、桩土刚度比进行了参数研究,并探讨了桩土应力比随其主要影响因素的变化规律,计算与实测结果吻合较好。
In view of the overall interaction of vertical reinforcement - horizontal reinforcement - soil between piles, the horizontal reinforced cushion is regarded as a plate with a certain stiffness. The vertical pile and the soil between piles are simplified into series of springs with different stiffness. Based on the Winkler elastic foundation circular plate theory, the deflection function of the horizontal stiffened body is deduced, and the pile-soil stress ratio of the bidirectional reinforced composite foundation is calculated formula. Finally, the calculation and analysis of an engineering example is carried out. The parameters of the embankment load, post-construction settlement, area replacement rate and pile-soil stiffness ratio are studied. The variation of pile-soil stress ratio with its main influencing factors is also discussed. Good agreement with the measured results.