Dynamic Response of an Axially-Loaded Pile: A Theoretical and Experimental Investigation

本文研究了半空间内有限变形桩在谐波轴向荷载作用下的动力响应。将该问题表述为可用合适的格林函数求解的第二类Fredholm积分方程。分析结果将通过在超固结粘土和干无粘性砂的离心机中进行比例模型实验来验证。由于结构设计需要适应除地震以外的动力载荷，如风和机器载荷，因此出于安全和经济原因，结构响应的详细知识是必要的。虽然结构的动力分析已经相当完善，但土与基础系统之间的动力相互作用仍然是一个有待解决的问题。离心机实验程序有可能为理论分析的校准和转化为直接的工程应用提供必要的数据基础。此外，调查将提供一个机会，仔细检查各种提出的技术对动态离心机建模的适用性，这仍然是非常处于起步阶段。在这次调查中获得的经验将加强和扩大离心技术在土壤动力学重要领域的应用方面的现有知识和技术。

This research program addresses the dynamic response of a finite deformable pile embedded in a half space under harmonic axial loading. The problem will be formulated to yield a Fredholm integral equation of the second kind which can be solved with suitable Green's functions. The analytical results will be verified by performing scale model experiments in a centrifuge with overconsolidated clay and dry cohesionless sand. Because of the needs in the design of structures to accomodate dynamic loading due to causes other than earthquakes such as wind and machine loads, detailed knowledge of the structural response is necessary for both safty and economic reasons. While dynamic analysis of the structure is reasonably well established, the dynamic interaction between the soil and the foundation system is still open to question. The centrifuge experimental program has a potential to provide the necessary data base for the calibration and translation of the theoretical analysis into direct engineering applications. In addition, the investigation will provide an opportunity to examine closely the suitability of various proposed techniques on dynamic centrifuge modeling, which is still very much in its infancy. The experience gained in this investigation will reinforce and expand the current knowledge and technology on the applications of the centrifuge technique to important areas of soil dynamics.