Effect of Nonlinearity in Granular Layer on Critical Pavement Responses of Low Volume Roads

Umesh Chandra Sahoo ； Kusam Sudhakar Reddy

《International Journal of Pavement Research and Technology》 3卷6期 (2010/11) Pp. 320-325

https://doi.org/10.6135/ijprt.org.tw/2010.3(6).320

並列摘要

Low volume roads in India mainly comprise of unbound granular materials laid over subgrade with thin bituminous surfacing. Hence, properties of the granular materials play a significant role in the performance of these pavements, as the thin surfacing layer is considered to be a non-structural layer. Therefore, accurate modeling of the granular layers is essential in the evaluation of critical pavement responses. Under application of load, unbound materials exhibit stress dependent characteristics. Thus, consideration of non-linearity in these layers is necessary for accurate estimation of the pavement responses of a flexible pavement structure. The granular materials show stress hardening characteristics, which indicates that the resilient modulus of the material increases with an increase in bulk stress. Finite element codes can be suitably used to handle the nonlinearity of unbound granular layers. Using a three dimensional (3D) finite element (FE) model, this paper examines the effect of nonlinearity in granular layers of critical pavement responses of a low volume road.

並列關鍵字

Finite element method ； Granular pavement ； Low volume road ； Nonlinearity