Response and stability of earth dams during strong earthquakes
Sarma, S. K.
Miscellaneous PaperAbstract: This earth dam study considers the response of an earth dam resting on a layer underlain by a rigid base and subjected to a strong ground motion. The dam and the layer are assumed to be elastic, homogeneous, and of simple geometric form. The properties of the dam and the layer may be different. Several combinations of the properties of the dam and the layer, as well as several ratios of the height of the dam to the depth of the layer, are studied. All of these are subjected to nine strong motion acceleration records, and their response is calculated. At the same time, seismic coefficients for various sizes of sliding wedges are computed. The results of individual cases and their envelopes are presented in the spectral form for design purposes. Methods of stability analysis for static and pseudostatic conditions are examined , and two new methods are presented. One of these methods is suitable for analyzing existing slip surfaces, and the other for quick computation of the critical acceleration for a given surface. Since pore water pressure developed in the dam during an earthquake is an important factor, a method of stability analysis is developed that takes the excess dynamic pore water pressure into account. The method is based on limit equilibrium principle. Pore water pressures are introduced in the form of dynamic parameter A𝗇. The result is obtained in the form of a critical acceleration required to cause failure as a function of the number of cycles of earthquake load. Also shown is the computation of displacements of sliding wedges when the earthquake load is greater than the critical acceleration. Then the study is concluded with an example of the analysis of the effects of the San Fernando earthquake of 9 February 1971 on the Lopez Dam in California. NOTE: This file is large. Allow your browser several minutes to download the file.
Geotechnical Laboratory (U.S.)Engineer Research and Development Center (U.S.)
Dams; Earth dams; Earthquakes; Earthquake effects; Dam stability; Dam foundations; Foundations; Earthquake resistant structures; Earthquake engineering; Lopez Dam, California; San Fernando Earthquake (1971)
Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; GL-79-13.
Approved for public release; distribution is unlimited.
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