Seismic Canyon Interaction Effects in Earth and Rockfill Dams

9320824比拉克这个项目研究土石坝的抗震性能，重点是大坝与其支撑之间的耦合效应，以及输入地震波的空间变异性的影响。目前的设计方法通常假定坝基是刚性的，而对土石坝在地震过程中的行为的观察表明，峡谷-大坝的相互作用会显著影响它们的地震反应。主要目的是阐明大坝-峡谷相互作用实际显著的条件，并开发可用于设计和修复实践的计算这些相互作用影响的方法。这些项目包括用反映现实条件的二维和三维模型进行计算机模拟。尽管主要关注的是明确了解大坝和峡谷之间的动力耦合影响大坝地震反应的机制，但人们的注意力主要集中在由干燥或致密的饱和颗粒土和粘性土建造的大坝，这些土壤不容易液化。然而，对于存在松散的饱和砂土和无粘性粉土的情况，地震液化评估也有一定的考虑。***

9320824 Bielak This project investigates the seismic performance of earth and rock-fill dams, focusing on the coupling effects between the dam and its support, as well as on the effects of the spatial variability of the incoming seismic waves. Current design methods generally assume a rigid dam foundation, whereas observations of the behavior of earth and rock-fill dams during earthquakes suggest that canyon-dam interaction can significantly influence their seismic response. The main objective is to elucidate the conditions under which dam- canyon interaction effects are practically significant, and to develop methods that can be used in design and remediation practice for calculating these interaction effects. The projects involves computer simulations with two- and three-dimensional models which reflect realistic conditions. In as much as the main focus is on gaining a clear understanding of the mechanism by which the dynamic coupling between the dam and the canyon affects the seismic response of the dam, attention is confined largely to dams constructed of either dry or dense saturated granular soils and cohesive soils that are not susceptible to liquefaction. Some consideration, however, is given to seismic liquefaction evaluation for cases in which loose saturated sands and cohesionless silts are present. ***