Based on a series of dynamic centrifuge tests (1:50 scale) on embankments founded on clay the following was made clear : (ⅰ) a dynamic load with = 250 gal, for example, induced large deformation and settlement in both embankment and clay under a gravity field of 50g; (ⅱ) deformation and instability were minimized by installing the cement treated layer up to the bottom of ground. Despite these findings, however, it is still uncertain whether embankment should be safer than a clay foundation or which embankments or soil layers would give rise to instability during strong motion earthquakes. This paper presents the results of dynamic FE method applied to above problem. Increasing strength of embankment material and cement treated clay leads to increased overall stability of the embankment and foundation together. A design chart has been produced in order to decide which combination between embankment and cement treated clay foundation would tend to be more stable during earthquakes such that engineers can decide whether it is necessary to strengthen the embankment or foundation layer
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