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基于改进的分层地基模型,考虑桩–土–筏的共同作用,提出了刚性桩筏基础非线性分析方法。地基附加应力计算考虑土层参数的变化,采用层状弹性体系的Burmister应力解;地基变形采用分层总和法,所采用的计算参数压缩模量和一维回弹模量试验确定方便。通过简单的室内一维加卸载试验确定其随加卸载次数的变化,进一步得到桩筏基础在重复加卸载下的沉降规律。对单桩和桩筏基础进行离心模型试验,并将计算结果和试验结果进行对比分析,验证了本文方法的正确性,可应用于实际工程问题的分析。
Based on the improved layered soil model and considering the interaction of pile-soil-raft, a nonlinear analysis method of rigid pile-raft foundation is proposed. The calculation of additional foundation stress takes Burmister stress solution of layered elastic system into account. The stratified totalization method of foundation deformation is adopted. The calculated compressive modulus and one-dimensional elastic modulus test are convenient to be used. The change of loading and unloading times was determined by a simple one-dimensional loading and unloading test in a room, and the settlement law of piled raft foundation under repeated loading and unloading was obtained. Centrifuge model test is carried out on single pile and piled raft foundation. The calculated results and test results are compared and analyzed, which verifies the correctness of the method and can be applied to the analysis of practical engineering problems.