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结合沿海地区某实际预应力高强混凝土管桩(PHC管桩)工程,采用有限元数值计算与现场试验测试对比分析的方法,研究了PHC管桩在海淤地质条件下的荷载传递机理,就桩土相互作用的一般规律进行了分析。有限元数值计算时,土体采用弹塑性本构模型,并考虑桩土界面的非线性接触状态。结果表明:数值计算结果与实测结果总体变化趋势一致;海淤软土与PHC管桩界面的摩阻力较小,桩身轴力在淤泥层传递较慢。
Combined with the engineering practice of an actual prestressed high strength concrete pipe pile (PHC pipe pile) in the coastal area, the load transfer mechanism of PHC pipe pile under the sea-silt geological conditions was studied by means of comparative analysis between finite element numerical calculation and field test. The general law of soil interaction is analyzed. In finite element numerical calculation, the elasto-plastic constitutive model is adopted for soil, and the nonlinear contact state between pile-soil interface is considered. The results show that the numerical results agree well with the measured results. The friction between the silt soft soil and the PHC pipe pile is small and the axial force of the pile is transmitted slowly in the silt layer.