Centrifuge tests on the seismic response of a submerged slope of natural soil

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Researches on slope failure induced by liquefaction in cohesionless soil have ever provided experimental and numerical results. Recently an international effort was made on the improvement of experimental, analytical and numerical methods for studying liquefaction phenomena in a gentle slope (LEAP liquefaction experiments and analysis project). However, few data are available on the seismic behavior of natural soil slope. Most of the natural sandy soils contain fine particles that can influence their liquefaction potential. In this framework a series of centrifuge tests on a submerged slope of natural soil was performed at the Gustave Eiffel University. This natural sandy soil contains around 10% of fine consisting largely of plastic fines. The 23° slope, with a relative density of 30% was reconstituted by under compaction method and saturated under vacuum with viscous fluid. The models were subjected to sinusoidal base shakings with different frequencies and amplitudes. Once the repeatability of the base shaking analyzed, the effects of the base shaking amplitude and frequency on the slope response are analyzed based on the calculated dynamic displacement, the acceleration and the pore pressure measurements. The increase of the amplitude and the decrease of the frequency increase the pore pressure built up and the dynamic displacement. However, for all the tested configuration no evidence of de-liquefaction phenomena was observed.

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