考虑桩-岩接触面流变的桩岩联合受力性能研究

桩-岩接触面的性质对桩岩联合受力的状况有重要影响。大量的工程实践表明,桩-岩接触面存在显著的剪切流变现象。在前人研究的基础上,介绍了以位移协调法为基础的双曲传递函数迭代计算方法,并据此建立了一种可考虑桩-岩接触流变的桩岩联合受力迭代计算方法。与现场模型桩试验实测结果对比分析表明,双曲传递函数迭代计算方法能够较好地描述桩岩联合受力性能。当考虑了桩-岩接触面的剪切流变后,桩身各处轴力随时间的增长逐渐增加,直至趋于稳定,桩的轴力比不考虑流变时桩的轴力大。迭代计算结果与实测结果吻合较好,对桩岩联合受力性能的研究有一定参考价值。

Research on pile-rock joint mechanical properties considering pile-rock interface rheology

The nature of pile-rock interface has important influence on the pile-rock joint mechanical properties. A large number of engineering shows that the pile-rock interface has obvious shear rheological phenomenon. On the basis of displacement compatibility theory, the hyperbolic transfer function iterative calculation method is introduced, and an iterative method, which takes the rheological property of pile side rock into account to analyze the pile rock joint stress reaction, is established. The comparison of the iterative results and the site model pile test results shows that the hyperbolic transfer function iterative method can describe pile-rock joint mechanical properties accurately. Considering the pile rock interface shear rheology, the axial force throughout the pile grows gradually over time until it is stabilized. Pile axial forces are larger than that without considering the rheology. The iterative calculation results and the measured results are in a good agreement, which have certain reference value to the research of pile-rock joint mechanical properties.