Failure Modes of Air Desaturated Sand in Undrained Cyclic Loading: A Systematic Experimental Investigation

Chavan, D and Sitharam, TG and Anbazhagan, P (2022) Failure Modes of Air Desaturated Sand in Undrained Cyclic Loading: A Systematic Experimental Investigation. In: Indian Geotechnical Journal, 52 (2). pp. 249-269.

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Abstract

This paper presents a systematic experimental investigation to understand different failure modes of air desaturated clean sand in undrained cyclic loading for a degree of saturation in the range of 70 to full saturation. Five distinct failure modes have been observed depending on the degree of saturation, relative density, effective confining pressure and cyclic shear stress ratio. Nearly saturated samples of loose sand at low confining pressure underwent hybrid cyclic liquefaction failure wherein it reached dense of critical state during compression stage of loading only. However, nearly saturated samples of medium dense sand at low confining pressure accumulated large plastic strain on the compression side owing to gradual strain softening. Both loose and medium dense samples, with a high degree of saturation, underwent cyclic mobility failure at high effective confining pressure, wherein the sample reached dense of critical state during both compression and extension stage of loading. Moreover, two types of cyclic softening failures, demarcated by two distinct phase transformation trends, were observed in samples with a low degree of saturation. Investigation from the critical state soil mechanics framework revealed that all test samples lay on the dense-of-critical side, and nearly saturated samples closest to critical state underwent cyclic mobility failure, whereas those at farthest from critical state failed by gradual strain softening.

Item Type:	Journal Article
Publication:	Indian Geotechnical Journal
Publisher:	Springer
Additional Information:	The copyright for this article belongs to the Springer.
Keywords:	Cyclic loads; Failure (mechanical); Geotechnical engineering; Rock pressure; Sand; Shear stress; Soil liquefaction; Soil mechanics; Soil testing; Supersaturation, Air desaturation; Axial strain; Critical-state; Cyclic mobility; Degree of saturations; Desaturation; Double amplitude axial strain; Initial liquefaction; Pore pressure ratios; Undrained, Critical current density (superconductivity)
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	03 Dec 2021 08:54
Last Modified:	05 Jul 2022 05:12
URI:	https://eprints.iisc.ac.in/id/eprint/70649

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