Active thrust of sand with anisotropic seepage: A generalised limit equilibrium approach

Ganesh, R and Khuntia, S and Sahoo, JP (2021) Active thrust of sand with anisotropic seepage: A generalised limit equilibrium approach. In: Proceedings of the Institution of Civil Engineers: Geotechnical Engineering .

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Abstract

Estimation of the magnitude and location of the lateral earth thrust on a retaining wall considering seepage flow effects within the backfill is necessary to examine the failures of such walls. In this work, the generalised limit equilibrium approach, based on the method of slices, was used to compute the magnitude and location of active earth thrust on the vertical face of a retaining wall taking into account steady seepage flow in the sand backfill. A drainage system along the backfill and wall interface and an anisotropic permeability characteristic of the backfill was considered for describing the pore pressure distribution within the backfill. Using force equilibrium conditions and an assumption regarding the direction of the interslice forces, the total normal stress distribution along the failure surface and the magnitude of total active earth thrust were determined. Subsequently, the location of the active earth thrust was determined to satisfy the moment equilibrium condition. Both planar and curvilinear failures surfaces were analysed to examine the impact on the solutions. It was confirmed that seepage flow within backfill substantially affects both the magnitude and location of active earth thrust, depending upon the degree of anisotropy. © 2020 ICE Publishing: All rights reserved.

Item Type:	Journal Article
Publication:	Proceedings of the Institution of Civil Engineers: Geotechnical Engineering
Publisher:	ICE Publishing
Additional Information:	The copyright for this article belongs to ICE Publishing
Keywords:	Anisotropy; Groundwater; Retaining walls; Seepage, Drainage systems; Earth thrust; Equilibrium approaches; Equilibrium conditions; Failure surface; Flow effects; Limit equilibrium; Sand backfills; Seepage flows; Steady seepage, Location
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	13 Dec 2021 11:39
Last Modified:	13 Dec 2021 11:39
URI:	http://eprints.iisc.ac.in/id/eprint/70766

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