PROBABILISTIC APPROACH TO PAVEMENT DESIGN BASED ON GENERALIZED CALIFORNIA BEARING RATIO EQUATION

In order to realize the thickness design of flexible pavements at a gi ven probability level, supplementary analysis of the generalized CBR e quation was carried out. Investigation includes verification of the eq uation parameters, analysis of the model transformation, and determina tion of the corresponding confidence intervals. Suggested approximatio ns of the constructed confidence limits for the generalized CBR equati on curve enable the implementing of the thickness design for flexible pavements, especially airfields, with a given probability level. For a practical application of the probabilistic approach, a computer progr am was prepared. An example of thickness design for the flexible pavem ent at a given probability level is presented. The results of the work provide controlled employment of the generalized CBR equation, thus i ncreasing the reliability of the predictions and conclusions in the de sign and evaluation of flexible pavements.