NEHRP Clearinghouse

Title
Seismic Permanent Deformations in Earth Dams.
File
PB273843.pdf
Author(s)
Lee, K. L.
Source
National Science Foundation, Washington, D.C. Research Applied to National Needs., December 1974, 36 p.
Identifying Number(s)
UCLA-ENG-7497
Abstract
This report considers the problem of estimating the permanent deformations that are likely to occur as a result of an earthquake. The basic concept involves the assumption that seismic induced deformations are due to a softening of the soil by seismic shaking so that following the earthquake, the embankment will settle or deform to a new condition compatible with the new 'softened' stiffness of the soil. A method for estimating this softening effect from the results of cyclic laboratory tests is described as well as a method of formulating the analysis into a pseudo static type of finite element program. The relevance of this new type of analysis to actual problems is illustrated by analyzing 5 different dams which have been damaged by previous earthquakes. A fair agreement was found between the predicted and the observed deformations.
Keywords
Ground motion; Earthquake engineering; Earth dams; Earthquakes; Finite element analysis; Earth movements; Soil mechanics; Embankments; Seismic waves