Liquefaction Resistance and Cyclic Response of Air Injected-Desaturated Sandy Soil

Chavan, D and Sitharam, TG and Anbazhagan, P (2022) Liquefaction Resistance and Cyclic Response of Air Injected-Desaturated Sandy Soil. In: Geotechnical and Geological Engineering, 40 (4). pp. 1851-1872.

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Abstract

Desaturation of in-situ saturated sandy soils is emerging as a new cost effective and environment friendly liquefaction mitigation technique. In the present study, stress controlled undrained cyclic triaxial tests have been conducted on air injected-desaturated sandy soil and various important issues such as number of cycles required for initial liquefaction, cyclic strength of desaturated sand, modes of failure, evolution of pore pressure, have been explored in detail. Number of cycles required for initial liquefaction increased exponentially with decrease in degree of saturation. Cyclic strength of desaturated sand with degree of saturation of 80 is found to be twice that of saturated sand, for relative density of 40. Assessment of performance of desaturated sand under various earthquake records revealed that desaturated sand with degree of saturation of 70 can prevent liquefaction during moderate to strong earthquakes having peak ground acceleration as high as 0.30 g. Further, sample with high degree of saturation underwent cyclic mobility failure. In samples with low degree of saturation, two types of cyclic softening failures demarcated by two distinct phase transformation trends were observed. A pore pressure model proposed by Konstadinoun and Georgiannou (2014) has been modified to predict the pore pressure evolution in desaturated sand. © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

Item Type:	Journal Article
Publication:	Geotechnical and Geological Engineering
Publisher:	Springer Science and Business Media Deutschland GmbH
Additional Information:	The copyright for this article belongs to the Springer Science and Business Media Deutschland GmbH.
Keywords:	Cost effectiveness; Earthquakes; Pore pressure; Soil liquefaction; Soils; Supersaturation, Air injection; Cyclic mobility; Cyclic strength; Degree of saturations; Desaturation; Initial liquefaction; Number of cycles; Pore pressure ratios; Sandy soils; Sandysoil, Sand
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	07 Dec 2021 10:23
Last Modified:	15 Jun 2022 05:20
URI:	https://eprints.iisc.ac.in/id/eprint/70390

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