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Constitutive Modeling of Flow Liquefaction and Cyclic Mobility
Flow liquefaction is due to contractive response of loose granular soils, while cyclic mobility is related to both contractive and dilative responses of granular soils. These two failure mechanisms may occur in a single soil, depending on the density and confining pressure applied. However, due mainly to the lack of a unified framework to describe the contractive and dilative response of granular soils these two failure mechanisms are considered separately in current practice. The key issue in unified treatment of these failure mechanisms is correct modeling of dilatancy. The classical stress dilatancy theory in its exact form is incapable of doing this. The dilatancy must be a function of stress state as well as of the internal material state. Such a state dependent dilatancy in conjunction with the critical state framework can effectively model both flow liquefaction and cyclic mobility over a wide range of material and stress states, using a single set of material constants. This paper describes this unified approach and a model that follows this approach.
Constitutive Modeling of Flow Liquefaction and Cyclic Mobility
Flow liquefaction is due to contractive response of loose granular soils, while cyclic mobility is related to both contractive and dilative responses of granular soils. These two failure mechanisms may occur in a single soil, depending on the density and confining pressure applied. However, due mainly to the lack of a unified framework to describe the contractive and dilative response of granular soils these two failure mechanisms are considered separately in current practice. The key issue in unified treatment of these failure mechanisms is correct modeling of dilatancy. The classical stress dilatancy theory in its exact form is incapable of doing this. The dilatancy must be a function of stress state as well as of the internal material state. Such a state dependent dilatancy in conjunction with the critical state framework can effectively model both flow liquefaction and cyclic mobility over a wide range of material and stress states, using a single set of material constants. This paper describes this unified approach and a model that follows this approach.
Constitutive Modeling of Flow Liquefaction and Cyclic Mobility
Li, X. S. (author) / Ming, H. Y. (author) / Cai, Z. Y. (author)
Geo-Denver 2000 ; 2000 ; Denver, Colorado, United States
2000-07-24
Conference paper
Electronic Resource
English
Constitutive Modeling of Flow Liquefaction and Cyclic Mobility
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