Target reliability-based optimisation for internal seismic stability of reinforced soil structures

Basha, Munwar B and Sivakumar Babu, GL (2012) Target reliability-based optimisation for internal seismic stability of reinforced soil structures. In: Geotechnique, 62 (1). pp. 55-68.

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Abstract

In this paper, an approach for target component and system reliability-based design optimisation (RBDO) to evaluate safety for the internal seismic stability of geosynthetic-reinforced soil (GRS) structures is presented. Three modes of failure are considered: tension failure of the bottom-most layer of reinforcement, pullout failure of the topmost layer of reinforcement, and total pullout failure of all reinforcement layers. The analysis is performed by treating backfill properties, geometric and strength properties of reinforcement as random variables. The optimum number of reinforcement layers and optimum pullout length needed to maintain stability against tension failure, pullout failure and total pullout failure for different coefficients of variation of friction angle of the backfill, design strength of the reinforcement and horizontal seismic acceleration coefficients by targeting various system reliability indices are proposed. The results provide guidelines for the total length of reinforcement required, considering the variability of backfill as well as seismic coefficients. One illustrative example is presented to explain the evaluation of reliability for internal stability of reinforced soil structures using the proposed approach. In the second illustration (the stability of five walls), the Kushiro wall subjected to the Kushiro-Oki earthquake, the Seiken wall subjected to the Chiba-ken Toho-Oki earthquake, the Ta Kung wall subjected to the Ji-Ji earthquake, and the Gould and Valencia walls subjected to Northridge earthquake are re-examined.

Item Type:	Journal Article
Publication:	Geotechnique
Publisher:	Thomas Telford Ltd
Additional Information:	Copyright of this article belongs to Thomas Telford Ltd.
Keywords:	Design; Earth Pressure; Earthquakes; Geosynthetics; Reinforced Soils; Slope
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	27 Mar 2014 09:01
Last Modified:	27 Mar 2014 09:01
URI:	http://eprints.iisc.ac.in/id/eprint/48804

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