Open Journal of Civil Engineering, 2018, 8, 234-244 http://www.scirp.org/journal/ojce ISSN Online: 2164-3172 ISSN Print: 2164-3164 Determination of an Equivalent Loading Circle Which May Represent the Loading of the Dual Wheels Baye Birane Thiam 1 , Fatou Samb 2 , Adama Dione 1 1 Laboratoire de Mécanique et Modélisation, UFR Sciences de l’Ingénieur, Université de Thiès, Thiès, Sénégal 2 Chef Département géotechnique, UFR Sciences de l’Ingénieur, Université de Thiès, Thiès, Sénégal Abstract This work aims to look for a simplifying surface that can represent the effect of the dual wheels on the variation of the stress and deformation state pre- vailing during the passage of traffic loads. This was facilitated by the results of Thiam (2016) [4] obtained on the distribution of the vertical contact stress in the space described by the dual wheels. The analysis of the results of this study, on all the loading circles considered, shows that the radius loading cir- cle equal to 0.181 m makes it possible to most probably represent the effect of the dual wheels. With this new surface, the effect of the dual wheels can be determined in 2D. The choice of this load is confirmed by a study in case of overload. Thus, the single axle with dual wheels is represented by a simplified diagram equipped on each side by a disk of radius 0.181 m. These results are obtained using a numerical simulation under Cast3M with a gravelly lateritic pavement. Keywords Dual Wheels, Circular Surface, Equivalent Loading Circle, Single Axle with Dual Wheels, Lateritic Gravelly, Cast3M 1. Introduction The concept of equivalent single-wheel load has long been used in the structural design of the pavement. In order to design the exchange of these loads at the equivalent single wheel load (ESWL), calculation methods have been proposed by some authors like [1] and [2]. These methods are particular adapted to the design of airport pavements. The rapidly changing configuration of heavy How to cite this paper: Thiam, B.B., Samb, F. and Dione, A. (2018) Determination of an Equivalent Loading Circle Which May Represent the Loading of the Dual Wheels. Open Journal of Civil Engineering, 8, 234-244. https://doi.org/10.4236/ojce.2018.82018 Received: April 23, 2018 Accepted: June 26, 2018 Published: June 29, 2018 Copyright © 2018 by authors and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY 4.0). http://creativecommons.org/licenses/by/4.0/ Open Access DOI: 10.4236/ojce.2018.82018 Jun. 29, 2018 234 Open Journal of Civil Engineering