Geotechnical considerations are important in identifying the conditionsleading to instability of seabed-offshore-structures under waves. It isnecessary to model such soil behavior via theoretical frameworks. Thispaper summarizes the fundamentals of constitutive modeling of cyclicseabed behavior. Two main theories namely, bounding surfaceplasticity and generalized plasticity theory are introduced for bothgranular and cohesive soils. Modeling considerations to evaluate theelasto-plastic soil response in terms of governing equations ofelemental behavior are presented. Finally, verification of theoreticalresults through classical tests is presented to demonstrate the accuracyof constitutive modeling of cyclic behavior of seabed around coastalstructures.
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