路基荷载下PCC刚性桩复合地基沉降简化计算

将路堤荷载作用下的刚性桩复合地基变形，简化为只有竖向变形，水平变形可以忽略，然后，应用土体的平衡、几何、物理方程，建立沉降计算的控制方程。桩土界面的接触条件按位移协调或产生滑移变形两种情况分别建立，采用有限差分法离散求解，可得桩、桩周土各自的沉降变形、桩土界面的摩擦力分布。与有限元分析和现场实测结果的对比表明，该简化方法具有较高的准确性，可以方便地应用到工程实际。

Settlement differential analysis of PCC rigid pilecomposite ground under road embankment loading

The horizontal displacement of the composite ground improved by rigid piles is negligibly small, thus the only remaining component is vertical settlement. Equilibrium equations, geometry equations and physical equations are used to derive the governing equation of the problem. Boundary condition at the soil-pile interface is accounted at two different states: the displacements of the pile and the surrounding soil are compatible or slippage is developed at the interface. The displacements of the pile and soil can be solved by finite difference method from the governing equation. Then skin friction on the pile can be predicted. By comparing with finite element analysis and the measured data in site, the simplified method is verified and is convenient to be used in engineering design.