饱和土-管桩动力相互作用理论与振动特性研究

Because of the different of the properties between pile around soil and pile core soil, and the different of permeability between pile and soil, there will be differences in the vibration characteristics,mechanical behavior and interaction mechanism of pipe pile and solid pile in saturated soil. The pile around soil and pile core soil will be regarded as two-phase porous medium, and the saturated soil-pipe pile coupled dynamic interaction will be described by the method of continous mechanics or Winkler spring-damper model based on the theory of porous mdeium. Considering some simple nonlinear factors, the coupled properties and mechanical behavior of pipe pile or pipe pile groups and saturaed soil-pipe pile-structure under various kinds of dynamic loads will be investiged. A valuable test data will be obtained by the shaking table model test of saturated soil-pipe pile and saturated soil-pipe pile-structure coupled vibration, and the experimental data will be compared with theoretical research. Through theoretical and shaking table model test studing the dynamic response of pipe pile in saturated soil under various dynamic loads, we will investigate the influence of material,geometric and load parameters on the saturated soil-pipe pile coupled vibration, and reveal the the interaction mechanism of saturated soil-pipe pile, and the key physical parameters of the system will be determined. The new theory and new method suitable for the study of the coupled vibration of pipe pile in saturated soil, and the theortical and experimental basis will be provided for the design,calculation,construction of pipe pile.

由于桩周土和桩芯土性质的不同、桩基和土体渗透率的不同，饱和土中管桩与实心桩振动特性、力学行为以及耦合相互作用机理将存在差异。本项目拟将桩周和桩芯土体视为两相多孔介质，基于多孔介质理论，采用连续介质力学法或Winkler弹簧-阻尼器模型刻画饱和土-管桩耦合动力相互作用。考虑若干简单非线性因素，研究各种动态荷载作用下饱和土中管桩(群管桩)以及饱和土-管桩-结构的耦合振动特性和力学行为。通过振动台模型试验获得饱和土-管桩、饱和土-管桩-结构耦合振动有价值的试验数据，并与理论研究进行对比分析。通过理论和振动台模型试验研究饱和土中管桩在各种动态荷载作用下的动态响应，考察材料、几何和荷载参数等对饱和土-管桩耦合振动的影响，深刻揭示饱和土-管桩的相互作用机理，确定耦合系统的关键物理参数。建立适用于饱和土-管桩耦合振动研究的新理论和新方法，为管桩的设计、计算、施工等提供理论和试验依据。

由于桩周土和桩芯土性质的不同、桩基和土体渗透率的不同，饱和土中管桩与实心桩振动特性、力学行为以及耦合相互作用机理存在差异。将桩周和桩芯土体视为两相多孔介质，基于多孔介质理论，采用连续介质力学法和Winkler弹簧-阻尼器模型刻画饱和土-管桩耦合动力相互作用。研究了简谐动态荷载作用下饱和土中管桩(群管桩)以及饱和土-管桩-结构的耦合振动特性和力学行为。通过大量的数值算例分析以及现场测试等研究了主要桩土力学参数对饱和土-管桩以及饱和土-管桩-结构水平、竖向等耦合振动的影响，确定了耦合系统的关键物理参数，一定程度上揭示了饱和土-管桩的相互作用机理，为管桩的设计、计算、施工等提供理论和试验依据。