The Coupled Sliding and Tilting, Obstructed Motion and Repeated Loading Behavior of Gravity Retaining Walls Under Seismic Excitation

9305133安徒生这项研究项目的目的是进一步了解重力式挡土墙在地震荷载下的基本行为；特别是重力式挡土结构在滑动和倾斜耦合作用下的影响(目前的设计做法忽略了旋转运动及其对土力的影响)；障碍性运动(即挡土墙与固定物体(如桥台和桥面)接触)的影响；以及重复荷载的影响。重点放在重力式挡土墙上，因为它们可以为理解更复杂的土挡土墙系统提供基础。具体目标是：1.完成以前的离心机模型研究的数据整理和分析，重点研究重力式挡土墙的倾斜行为；2.进行具有滑动和倾斜耦合、遮挡运动和重复加载特性的干砂回填重力式挡土墙的新研究。这涉及到在安装在土工离心机上的比例模型挡土墙上进行实验，该模型能够模拟地震强烈运动。这些研究将被用来评估目前提出的描述挡土结构的滑动和倾斜、受阻运动和重复加载行为的技术的实用性。***

9305133 Andersen The aim of this research project is to further understand the fundamental behavior of gravity retaining walls subject to earthquake loading; in particular, the effect of coupled sliding and tilting on a gravity earth retaining structure (current design practice neglects rotational motion and its effect on earth forces); the effect of obstructed motion (that is, a retaining wall coming in contact with a fixed object such as a bridge abutment and a bridge deck); and the effect of repeated loading. The focus is on gravity retaining walls, as these can provide the basis for understanding more complex earth retaining systems. The specific objectives are to: 1. Complete the data reduction and analysis of a prior centrifuge modeling study that focused on the tilting behavior of gravity retaining walls; 2. Conduct a new study on gravity retaining walls with dry sand backfill that is capable of coupled sliding and tilting, obstructed motion, and repeated loading behavior. This involves experiments on a scale-model retaining wall mounted on a geotechnical centrifuge which is capable of simulating earthquake strong motions. These studies will be used to assess the utility of currently proposed techniques for describing coupled sliding and tilting, obstructed motion and repeated loading behavior of earth retaining structures. ***