Development and Validation of a Two-Phase Model for Reinforced Soil by Considering Nonlinear Behavior of Matrix
Publication: Journal of Engineering Mechanics
Volume 136, Issue 6
Abstract
The paper presents the formulation of a two-phase system applied for reinforced soil media, which accounts for nonlinear behavior of matrix phase. In a two-phase material, the soil and inclusion are treated as two individual continuous media called matrix and reinforcement phases, respectively. The proposed algorithm is aimed to analyze the behavior of reinforced soil structures under operational condition focusing on geosynthetics-reinforced-soil (GRS) walls. The global behavior of such deformable structures is highly dependent to the soil behavior. By accounting for mechanical characteristics of the soil in GRS walls, a relatively simple soil model is introduced. The soil model is formulated in bounding surface plasticity framework. The inclusion is regarded as a tensile two-dimensional element, which owns a linear elastic-perfectly plastic behavior. Perfect bonding between phases is assumed in the algorithm. For validation of the proposed model, the behavior of several single element reinforced soil samples, containing horizontal and inclined inclusions, is simulated and the results are compared with experiment. It is shown that the model is accurately capable of predicting the behavior especially before peak shear strength. The proposed algorithm is then implemented in a numerical code and the behavior of a full-scale reinforced soil wall is simulated. The results of analysis are also reasonably well compared with those of experiment.
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Information
Published In
Journal of Engineering Mechanics
Volume 136 • Issue 6 • June 2010
Pages: 721 - 735
Copyright
© 2010 ASCE.
History
Received: Jul 29, 2008
Published online: Nov 4, 2009
Accepted: Nov 11, 2009
Published in print: Jun 2010
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