海淤地质条件下PHC管桩荷载传递机理研究

摘要

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.%With a practical prestressed high-strength concrete (PHC) pile engineering, the load transfer mechanism of PHC piles was studied under the silting geological condition by using finite element numerical calculation and field test method. For the finite element numerical calculation, elastic-plastic constitutive model was used for the soil, the nonlinear contact of the interface state was considered. Results show that in the general the numerical results and the measured results are in good agreement. The force of friction between PHC and silting is smaller, axial stresses of the pile in mud layer transfer slower.