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

9305133 Andersen本研究项目旨在进一步了解重力挡土墙在地震荷载作用下的基本行为；特别是，耦合滑动和倾斜对重力挡土结构的影响（目前的设计实践忽略了旋转运动及其对土力的影响）；障碍物运动（即挡土墙与桥台、桥面等固定物体接触）的影响；以及反复加载的效果。重点是重力挡土墙，因为它们可以为理解更复杂的挡土系统提供基础。具体目标是：1。完成先前离心机模型研究的数据减少和分析，重点是重力挡土墙的倾斜行为；2. 对干砂回填重力挡土墙进行了新的研究，该挡土墙具有滑动和倾斜耦合、障碍物运动和重复加载行为的能力。这包括在一个安装在能够模拟地震强烈运动的岩土离心机上的比例模型挡土墙上进行实验。这些研究将用于评估目前提出的描述土挡结构的耦合滑动和倾斜、阻碍运动和重复加载行为的技术的效用。* * *

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. ***