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首先基于Winkler地基模型,假设桩土不发生分离,不考虑承台以及地基土对荷载的分担作用,建立单桩竖向位移控制方程。然后采用剪切位移法确定土体竖向位移传递系数,将主动受荷桩引起的土体位移施加于群桩中的受影响桩,计算桩-桩相互影响。最后,采用有限差分法,建立非均质土体中竖向受荷群桩的计算方程,分析群桩竖向力学反应。最后对该方法与已有文献中单桩、群桩在均质、非均质地基中的算例进行对比,总体上取得了较好的一致性。
First, based on the Winkler foundation model, assuming that pile-soil separation does not occur, the vertical displacement control equation of single-pile is established, irrespective of the role of cap and foundation soil in load sharing. Then the shear displacement method is used to determine the vertical displacement transfer coefficient of the soil mass, and the soil displacement caused by the active pile is applied to the affected pile in the pile group to calculate the pile-pile interaction. Finally, the finite difference method is used to establish the equations of vertical pile groups in heterogeneous soils, and the pile group vertical mechanics responses are analyzed. Finally, this method is compared with the existing examples of single piles and pile groups in homogeneous and heterogeneous foundations, and generally obtains better consistency.