Abstract
The occurrence of a series of earthquakes of different magnitudes or multiple mainshocks has been reported recently. This leads to the liquefaction of sand due to excess pore pressure generation under undrained loading conditions, which alters the stable structure of the soil to an unstable form. The response of saturated sandy deposits under these conditions is rarely experimented by researchers and the present study highlights this issue. Here six shake table test results are analyzed to understand the initiation of liquefaction in the sand at varying base accelerations (0.15 g, 0.2 g and 0.3 g) at continuous and series of identical shaking events. Multiple shaking events were provided to simulate earthquakes at closely spaced time intervals. The surface settlements and response of excess pore water pressure at various depths within a saturated sand bed due to these shaking events are investigated. The results showed that the soil layer near the surface of the soil is most likely to be liquefied. Also, the re-liquefaction resistance of the sand remains constant for the first few shakings, but the dissipation time of excess pore water pressure decreases with increasing density.
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Acknowledgements
The authors gratefully acknowledge the Kerala State Council for Science, Technology and Environment (KSCSTE) for the financial support offered for the research project entitled “Liquefaction Studies on sand deposits in Kerala”.
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All authors contributed to the study conception and design. Methodology: CBB and BKS; formal analysis and investigation: BKS and VJ, writing—original draft preparation: VJ; writing—review and editing: VJ and BKS. All authors read and approved the final manuscript.
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Jayakrishnan, V., Beena, K.S. & Blayil, C.B. Studying the Impact of Continuous and Multiple Earthquake Ground Motions on Pore Pressure in Saturated Sandy Deposits. Geotech Geol Eng (2024). https://doi.org/10.1007/s10706-024-02816-2
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DOI: https://doi.org/10.1007/s10706-024-02816-2