Higgins, WMartindale, HChakraborty, TBasu, D2013-11-142013-11-142013-11-15http://dl.lib.mrt.ac.lk/handle/123/9180Design of sustainable civil infrastructure requires that the built environment is resilient against natural and man-made hazards which can cause catastrophic failures. As a result, high rates of strain (102- 104/sec) are generated in the soil which plays a significant effect on the strength and stiffness of soil. In this paper, we investigate the high strain-rate behavior of sand by developing a rate-dependent, multi-axial, viscoplastic two-surface constitutive model based on the concepts of critical-state soil mechanics. Perzyna’s overstress theory and non-associated flow rule are used in this model. The rate-dependent model parameters are determined from experimental data of split Hopkinson pressure bar test under high rate loading. Model performance is demonstrated for various sands.enConference-Full-text2010International Conference on Sustainable Built Environments 2010Earl's Regency Hotel, Kandy.Sustainable Built Environmentsdbasu@engr.uconn.edutanusree.research@gmail.com