Abstract
In the past study that a research group of Tokyo University of Agriculture, Ishikawa National College of Technology, Public Works Research Institute and Japan Cement Association carried out, design curves of the crusher-run base, the mechanical stabilized base and the cement treated base considering reliability were proposed based on bearing capacity research results of an actual size concrete pavement / base course yard constructed in the Public Works Research Institute and the past researches. However the two layered base course design method was not examined. Consequently in this study, change of bearing capacity of the two layered base course surface was examined using the Monte-Carlo simulation when the reliability level of design curves were changed, and as a result a simple reliability calculation method was proposed.
