A Time-Dependent Microplane Model for Creep of Cohesive Soilsby Pere C. Prat, Universitat Politecnica De Catalunya, Barcelona, Spain,
Zdeněk P. Bažant, Universitat Politecnica De Catalunya, Barcelona, Spain,
Abstract: The microplane model is used in this paper to describe the time-dependent (creep) behavior of cohesive soils (clays). The constitutive equations are defined on each of a set of microplanes which cover all possible spatial orientations, with a kinematic constraint to the macroscopic response. The total strain components are assumed to be the sum of a time-independent and a time-dependent (creep) contribution. The creep evolution laws are defined within the framework of the rate process theory (activation energy principle), in which the strain rates depend on the current stress level, temperature and time. The model can reproduce instantaneous as well as time-dependent behavior, for drained or undrained conditions. Numerical results show good qualitative agreement with laboratory test data taken from the literature. The paper closes by discussing the implementation of the model in finite element codes.
Subject Headings: Creep | Time dependence | Laboratory tests | Clays | Finite element method | Soil stress | Constitutive relations
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