A State Parameter Based Generalized Plasticity Model for Unsaturated Soils
D. Manzanal; M. Pastor; J.A. Fernandez Merodo; and P. Mira

Source CMES: Computer Modeling in Engineering & Sciences, Vol. 55, No. 3, pp. 293-318, 2010
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Keywords Constitutive modelling, state parameter, unsaturated soils.
Abstract This paper presents an extension of the Generalized Plasticity model proposed by Pastor - Zienkiewicz in 1986. The extension is based on (i) incorporating a state dependant parameter to model the mechanical behaviour of sand under a wide range of relative densities and confining pressures (ii) the definition of the effective stress of Schrefler (1984) modified to obtain unique CSL for different suction and (iii) the work conjugated variable proposed by Houlsby (1997). Several examples are presented for saturated and unsaturated soils.
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