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引进“典型单元体”与“虚土桩”模型,将柔性基础-垫层-复合地基-下卧层土体视为上下部共同作用的系统,考虑桩土界面之间允许有相对滑移并假设同高度处桩间土沉降不等,改造了Alamgir型桩间土位移模式,得到了柔性基础下复合地基系统的弹性力学微分方程组及其解;通过工程实例验证并评估了该解析解的合理性与精度;最后基于标准算例,通过所得解析解对系统的等沉面高度、中性点位置、桩身轴向应力、桩土应力比等展开了研究。结果表明:该解析解能较准确地反映柔性基础下复合地基的工作性状,沉降计算精度较复合模量法高;系统各因素对荷载传递规律都有不同程度的影响,必须重视系统上下部共同作用的深入研究。
We introduce the model of “unit cell” and “dummy soil pile”, and take the flexible foundation-cushion-composite foundation-subsoil soil as the system of interaction between the upper and lower parts. Considering the interaction between pile-soil interface Relative slip and assuming different settlement between the piles at the same height, the soil displacement model of Alamgir pile was modified and the elastic differential equations of elasticity and its solution of the composite foundation system with flexible foundation were obtained. The engineering example validated and evaluated Finally, based on the standard case study, the isometric height, neutral point position, pile axial stress and pile-soil stress ratio of the system are analyzed based on the analytical solution obtained. The results show that the analytical solution can reflect the working behavior of composite foundation under flexible foundation accurately and the accuracy of settlement calculation is higher than that of composite modulus method. All the factors of the system have different degrees of influence on the load transfer law. In-depth study of the role.