Experimental Investigations in Nonlinear Viscous Behavior of Subgrade Soils Under Traffic-Induced Loading
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1999-08-01
By Li, Jiang
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Abstract:This paper concerns experimental investigations of nonlinear viscosity of
subgrade soils under vehicle-induced loading. Subgrade soil samples--collected
from the Soil/Aggregate Laboratory at the Geotechnical Exploration Division at
the Maryland State Highway Administration, Maryland Department of Transportation
--were used to conduct triaxial shear tests under repeated loading that is
designed to simulate the cyclic stress induced by vehicles. Investigations in
this paper included two aspects. First, a nonlinear viscous model has been
introduced to describe the relation of shear stress and strain rate. This
relation is reduced from the constitutive law of nonlinear poroviscosity
suggested by Li (1994, 1999a, 1999b) and Li Helm (1995, 1998). Second, to model
the viscous behavior of soil under cyclic loading constitutive parameters were
investigated and calibrated through experimental results from triaxial shear
tests. In this paper, viscous parameters were assumed to be a function of the
deviatoric strain and loading repetitions. Viscous behavior of soils changing
with deviatoric strain and cyclic loading repetition were studied. Supported
by a grant from the U.S. Department of Transportation, University Transportation
Centers Program. 56p.
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