IMPULSIVE FAILURE EXPERIMENTS ON V-SHAPED SLOPING EMBANKMENT MODELS

概要

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Despite numerous experiences of serious earthquake damages, little knowledge has been obtained about dynamic failure mechanism for sloping embankments constructed in narrow valleys. A fundamental study by means of a series of model tests followed by several analyses was performed to clarify dynamic failure characteristics of V-shaped sloping embankments subjected to impulsive loadings. A simple test equipment system has established to provide the embankment model made of wet sand with well-controlled impact loads. The system is capable of producing an impulsive inertia force with a triangular waveform, and giving rise to a three dimensional failure mass in the embankment. Accelerograms observed on the failure mass are found to give a truncated waveform with an abrupt drop at the end, as well as concavity associated with three dimensional geometry of the failure mass. Yield acceleration read off the truncated accelerograms shows a remarkable increase with a decrease in a width to depth ratio of the embankment, demonstrating restraining effects of the valley walls. Stability and relative displacement are calculated for imaginary tetrahedral failure blocks to compare with the yield acceleration and observed settlement, respectively.
社団法人地盤工学会の論文
1984-12-15