Author/Authors :
Rezaei Ehsan نويسنده , ARVIN Mohammad Reza نويسنده , Bahmani Shoorijeh Mostafa نويسنده Isfahan University of Technology
Abstract :
Although several analytical and numerical approaches have been devoted to
investigate the shakedown behavior of pavements, shakedown limit of reinforced pavements,
in particular geocell-reinforced pavements, has not been explored yet by load-displacement
numerical means. In this study, behavior of a typical three-layer pavement reinforced with
geocell was investigated under repeated vertical trac loads by three-dimensional nite
element elasto-plastic analysis based on shakedown failure and serviceability criteria. Three
di erent cases of unreinforced, base-layer-reinforced, and subgrade-reinforced pavements
were taken into consideration and subjected to a variety of vehicle loads. Shakedown
limit, which is the multiplication of initial load by shakedown coecient for each pavement
under each load, was determined through a trial and error process. Results indicated
that reinforcement of subgarde by geocell signi cantly improved the shakedown coecients
of pavements. Reinforcement of base by geocell increased the shakedown coecient of
pavements as well as but not as much as subgrade reinforcement. Results also indicated
the sensitivity of shakedown coecient and shakedown bearing capacity to intensity and
shape of the contact area of di erent loads in a way that the most extreme case was observed
for P = 22 ton. Variation of accumulated plastic displacement prior to shakedown state
has also been presented and discussed
