Numerical Modeling of Unbound Granular Materials in Pavement Structures
2005 (English)In: Proceedings of the 16th International Conference on Soil Mechanics and Geotechnical Engineering: Vols 1-5: GEOTECHNOLOGY IN HARMONY WITH THE GLOBAL ENVIRONMENT , 2005, 1699-1702 p.Conference paper (Refereed)
New pavement design methods are under development where the aim is to predict functional and structural conditions of the road over time. To be able to take advantage of these new design methods a better understanding of the ability to calculate the response of pavement structures due to vehicle load is needed were the mechanical properties of the constituent materials are properly presented. For thin pavement structures the granular materials, base and subbase layers, play an essential role in the overall structural performance. However they show a complex elasto-plastic behaviour under external loading. An instrumented thin surface dressed pavement structure has been tested in accelerated testing by using a Heavy Vehicle Simulator (HVS). The response of the structure due to traffic loading was measured and thereafter two different numerical techniques used to predict the structural behaviour, the Multilayer Elastic Theory (MLET) and the Finite Element (FE) method. Both linear and nonlinear elastic analyses have been carried out to simulate the response of the structure. It was found that analyses where the nonlinear base behaviour is taken into account gave better agreement with measurements compared to a linear elastic analyses. Based on the calculated response of vertical strain in the pavement structure as well as from results from Repeated Load Triaxial (RLT) testing a simple power law function is used to estimate the development of rutting in the pavement structure and compared to actual measurements. Good agreement was found between the actual measurements and the calculations.
Place, publisher, year, edition, pages
2005. 1699-1702 p.
IdentifiersURN: urn:nbn:se:kth:diva-88469ISI: 000246615102128OAI: oai:DiVA.org:kth-88469DiVA: diva2:502329
16th International Conference on Soil Mechanics and Geotechnical Engineering, Osaca, Japan
TSC import 1639 2012-02-14. QC 201203072012-02-142012-02-142012-03-07Bibliographically approved