A Simplified Mechanistic Rut Depth Prediction Procedure for Low-Volume Roads

Details

• Creators:
  Yapa, Kashyapa A. S. ; Lytton, Robert L.
• Corporate Creators:
  Texas Transportation Institute. Texas A&M University
• Corporate Contributors:
  Texas State Department of Highways and Public Transportation ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  Deformation Laboratory Tests Low Volume Roads Mathematical Prediction Mechanolattice Modulus Of Resilience Nondestructive Tests Residual Stress Rutting
• Publication/ Report Number:
  FHWA/TX-89/473-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; Texas
• Edition:
  Interim: September 1986 - December 1988
• Corporate Publisher:
  Texas Transportation Institute. Texas A&M University
• Abstract:
  In this study, a procedure for predicting the number of passes of a wheel load that will cause a specified rut depth is developed, using information which includes the base layer thickness, the resilient moduli and general classification of the granular base course and the subgrade soils. The procedure is mechanistic but simple and is based on the permanent deformation characteristics of various types of soils determined in the laboratory and also from test results published by other researchers. Resilient moduli of pavement material layers are obtained from the results of non-destructive testing techniques. The validity of predictions of a number of these techniques is verified by comparing them with laboratory test results. Parametric runs were made using the Mechano-lattice program to form a database of rut depths. The procedure uses a multi-parametric interpolation scheme on the database in order to make predictions. Pavement materials were retrieved from six farm-to-market road sections and permanent deformation tests and resilient modulus tests were carried out. The permanent deformation behavior was modeled as a straight line in a logarithmic plot of the residual strain and the number of load repetitions. Typical slopes and intercepts of this line were determined for various soil materials. If the volumetric aggregate and moisture contents are known, an expression is also proposed to calculate the value of the slope. Expressions are giving for the intercept as a function of the resilient modulus and the soil classification. The Mechano-lattice approach, which takes into account the realistic interaction effects of the permanent deformation behavior of the individual layers, is shown to produce results which differ from the more commonly used approximately method of superposition.
• Format:
  PDF
• Funding:
  2-18-87-473
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:5ffb0e57367c9790dc1d2abb2292d4becbb73e3354cd335c12fc32686fd5d870e744234adfba95628a6a324a30c05c4ea7a39556e975fbeee42c471e0e44c785
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/86020/dot_86020_DS1.pdf
• File Type:
  [PDF - 3.68 MB ]