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Behaviors of Drained Lateral Extension for Saturated Sand and Their Applications

Published online by Cambridge University Press:  05 May 2011

C.-P. Yang
C.-P. Yang*
Affiliation:
Department of Civil Engineering and Engineering Informatics, Chung Hua University, Hsinchu, Taiwan 30067, R.O.C.
*
*Associate Professor
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Abstract

Practically all retaining walls may rotate, yet movements of the wall could be restricted, particularly under working conditions. Since the earth pressure on the retaining wall often deviates from the fully active state, there is a need for predicting the earth pressure at any wall movement. The shearing behavior of backfill behind the wall plays an essential role for predicting the redistributions of earth pressure for different wall movements. This paper studies 25 sets of test for analyzing the drained lateral extension behaviors of saturated Ottawa sand. Three methods are used to interpret the active state of specimens and it is found that the monotonic increasing property of the σ'cs – εrp plot obtained by using the (q')max method is more obvious than those obtained by the other two methods. Where σ'cs is an initial confining stress of specimen for lateral extension test, and εrp is a radial strain of specimen developed at the active state. The specimens, with the relative density between 15% ∼ 90% and with the confining stress between 80kPa ∼ 280kPa, range their values of εrp from −1.18% to −2.99%. The magnitude of εrp can be used to judge the secure level of deformation for a retaining structure. Subsequently, this study derives a formula to predict the redistribution of earth pressure on a retaining wall when the wall moving outwards based on the results of those lateral extension tests. This prediction method is a new approach to study the problems of earth pressure. Comparisons of predicted results from numerical solutions technique and observations from model tests show that the performance of this method is reasonable.

Keywords

Lateral extension behaviorsEarth pressure distributionRetaining wallSaturated sand.
Type
Articles
Information
Journal of Mechanics , Volume 23 , Issue 1 , March 2007 , pp. 51 - 62
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2007

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