Earthquake resistant design of cohesive earth slopes
DOI:
https://doi.org/10.5459/bnzsee.4.1.51-72Abstract
As many major slope failures have occurred during medium and strong earthquakes, the assessment of the seismic stability of slopes in earthquake-prone areas is of great concern to engineers. Prior to 1964, little attention was given to the development of rational aseismic design methods for earth slopes. Most design methods were based on a static analysis used in conjunction with an arbitrarily selected lateral force acting on the slope with soil strengths determined by conventional laboratory tests. However, the catastrophic slope failures which occurred during the Alaskan earthquake of 1964, resulted in a considerable reappraisal of such static design methods. In recent years significant progress has been made in developing new methods of laboratory testing to determine dynamic soil properties, improved techniques of analysing the dynamic response of slopes and embankments to earthquakes, and new concepts of aseismic design methods for earth slopes. Although research has yet to provide all the answers, the current state of knowledge at least provides an improved guide to engineering judgement in the assessment of the stability of earth slopes during earthquakes.
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