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柔性基础下复合地基的受力及变形过程是柔性基础、垫层、复合地基以及桩端下卧层土体四者相互作用、应力和变形相互耦合的复杂过程。在分析柔性基础下复合地基的荷载传递机理的基础上;将柔性基础-垫层-复合地基-下卧层土体作为一个共同作用的整体,建立考虑上、下部共同作用的柔性基础下复合地基简化分析模型,考虑柔性基础、垫层、复合地基与下卧层土体之间应力、变形协调关系以及桩、土界面的相对滑移,推导出表征复合地基性状的沉降变形和桩土应力比的求解公式;最后通过与工程实测结果的对比分析,验证该方法的合理性和适用性。
The process of stress and deformation of the composite foundation under the flexible foundation is a complex process in which the interaction between the flexible foundation, the cushion, the composite foundation and the soil under the pile bottom is coupled and the stress and the deformation are coupled with each other. Based on the analysis of the load transfer mechanism of the composite foundation under the flexible foundation, the composite foundation of the flexible foundation-cushion-composite foundation-subsoil is taken as a co-acting body and the composite foundation The analysis model is simplified, and considering the coordination of stress and deformation between flexible foundation, cushion, composite foundation and underlying soil, and the relative slip of pile-soil interface, the settlement deformation and pile-soil stress ratio Finally, through the comparison with the actual measured results, the rationality and applicability of the method are verified.