Shake table testing of liquefaction mitigation efficiency on pile foundations in sand stabilised with colloidal silica

Jiji Krishnan () and Shruti Shukla
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Jiji Krishnan: Sardar Vallabhbhai National Institute of Technology
Shruti Shukla: Sardar Vallabhbhai National Institute of Technology

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2022, vol. 111, issue 3, No 8, 2317-2341

Abstract: Abstract Pile foundations in sands are susceptible to damage during earthquake-induced liquefaction. In the last decade, colloidal silica treatment in sand has been considered a novel technique to improve the properties of sand without disturbing the structure. The 1-g shaking table tests were performed in the current study to examine the liquefaction performance of the pile foundation in colloidal silica-treated sand. Colloidal silica treatment considerably reduces the pore water pressure ratio of sand. Moreover, the ground surface remained intact after shaking, and a minimal settlement was noticed in the case of all the relative density samples treated with colloidal silica. The colloidal silica ground improvement method is suitable to mitigate liquefaction damages during shaking events in sandy soils and guarantees the protection of structures during earthquakes and other shaking events. It is important to analyse the influence of water on the strength in order to get more insights into colloidal silica stabilised sites. The water table fluctuations of the field might change the strength of sand stabilised using weakly cemented colloidal silica. So, the current study also aims to demonstrate the effect of variations in strength with the fluctuation of the water table in colloidal silica-treated sand. Treating the sand layers with an optimal amount of colloidal silica reduces pore water pressure ratio and settlement in all relative density samples. The treatment with colloidal silica slowdowns the maximum settlement time for all the tests conducted.

Keywords: Sand stabilisation; Shake table; Liquefaction; Colloidal silica (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1007/s11069-021-05139-0

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