Title: DEFORMATION CHARACTERISTICS OF SUBGRADE SOILS UNDER REPEATED LOADING
Abstract: A Mechanistic-Empirical (M-E) design method will be the key feature of the next version of the AASHTO Guide for the Design of Pavement Structures. One of the requirements for M-E design procedures is the direct estimation of rutting by summarizing the permanent deformation of component pavement layers including subgrade. This paper reports an extensive research effort relating to permanent deformation of subgrade soils. Repeated load testing was conducted on an Arkansas subgrade soil. While most soil specimens were subjected to 10,000 to 100,000 load repetitions, one specimen was loaded to over 1 million applications to verify the general trend of deformation accumulation. Various factors including moisture content, density, deviator stress, confining pressure, load frequency, freeze-thaw and aging were investigated to determine their individual contributions to deformation accumulation. A test protocol was developed to effectively evaluate deformation parameters of subgrade soils. Data analysis from the repeated load testing also provided useful information for refinement of philosophies regarding design, construction, and operation of highway systems. (A
Publication Year: 1999
Publication Date: 1999-08-01
Language: en
Type: article
Access and Citation
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot