Stability evaluation of soil structure for earthquake taking acceleration time history into consideration

本研究主要围绕两个主题展开。一是地震动载作用下土体结构稳定性评价。二是对土体结构在动力荷载作用下的残余变形进行评价，采用地震系数法对土体结构在方向和大小随时间变化的动力荷载作用下的稳定性进行了评价。但是，它不能考虑地震的加速度时程，也不能同时考虑土结构和地基的动力特性。本文提出了一种考虑加速度时程的地震动载作用下土体结构稳定性的新分析方法。讨论了该方法在设计中的适用性。另一方面，发展了刚塑性动力变形分析，以评估地震荷载作用下的残余变形。在刚塑性假设中，位移通常是确定的。然而，考虑到边界上的规定加速度，它是合理确定的。文中给出了地震作用下路堤问题的典型算例。

This study focuses on two topics. One is stability evaluation of soil structure for dynamic loading as earthquake. The other is evaluation on residual deformation of soil structure caused by dynamic loading.The seismic coefficient method has been employed to estimate a stability of soil structure for a dynamic load the direction and the magnitude of which vary in time. But, it can not consider an acceleration time history of an earthquake and dynamic properties of both soil structure and ground. This study presents a new analytical method to estimate a stability of soil structure for a dynamic loading as an earthquake taking acceleration time history into account. The applicability of this method to design is discussed.On the other hand, rigid plastic dynamic deformation analysis is developed to evaluate a residual deformation by an earthquake loading. In a rigid plastic assumption displacement is generally in determinate. It is, however, rationally determinate in concern with a prescribed acceleration on the boundary. Typical numerical examples are shown for embankment problems under earthquakes.