EXPERIMENTAL INVESTIGATIONS IN NONLINEAR VISCOUS BEHAVIOR OF SUBGRADE SOILS UNDER TRAFFIC-INDUCED LOADING

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 the 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 and 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 paramaters 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.

• Record URL:
  • https://doi.org/10.21949/1403227
• 
• Record URL:
  • https://rosap.ntl.bts.gov/view/dot/12660
• Supplemental Notes:
  • Supported by a grant from the U.S. Department of Transportation, University Transportation Centers Program
• Corporate Authors:

  Morgan State University

  National Transportation Center, 1700 East Cold Spring Lane
  Baltimore, MD  United States  21251

  Department of Transportation

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Li, Jian
  • 0000-0003-3439-7539
• Publication Date: 1999-8

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: 47 p.

Subject/Index Terms

• TRT Terms: Deviatoric stress; Experiments; Nonlinear systems; Pavement subgrade; Repeated loads; Shear strain; Shear stress; Soils; Traffic loads; Triaxial shear tests; Viscous flow
• Uncontrolled Terms: Deviatoric strain; Models; Poroviscosity
• Subject Areas: Freight Transportation; Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 00789129
• Record Type: Publication
• Files: UTC, NTL, TRIS, USDOT
• Created Date: Mar 14 2000 12:00AM