Experimental Investigations in Nonlinear Viscous Behavior of Subgrade Soils under211 Traffic-Induced Loading

摘要

This paper concerns experimental investigations of nonlinear viscosity of211u001esubgrades soils under vehicle-induced loading. Subgrade soil samples--collected 211u001efrom the Soil/Aggregate Laboratory at the Geotechnical Exploration Division at 211u001ethe Maryland State Highway Administration, Maryland Department of Transportation--211u001ewere used to conduct triaxial shear tests under repeated loading that is designed 211u001eto simulate the cyclic stress induced by vehicles. Investigations in this paper 211u001eincluded two aspects. First, a nonlinear viscous model has been introduced to 211u001edescribe the relation of shear stress and strain rate. Second, to model the 211u001eviscous behavior of soil under cyclic loading, constitutive parameters were 211u001einvestigated and calibrated through experimental results from triaxial shear 211u001etests. In this paper, viscous parameters were assumed to be a function of the 211u001edeviatoric strain and loading repetitions. Viscous behavior of soils changing 211u001ewith deviatoric strain and cyclic loading repetition were studied.