科研之友
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摘要
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 traffic loads by three-dimensional finite element elasto-plastic analysis based on shakedown failure and serviceability criteria. Three different cases of unreinforced, base-layer-reinforced, and subgrade-reinforced pavements were taken into consideration and subjected to a variety of vehicle loads. Shakedown , which is the multiplication of initial load by shakedown coefficient for each pavement under each load, was determined through a trial and error process. Results indicated that reinforcement of subgarde by geocell significantly improved the shakedown coefficients of pavements. Reinforcement of base by geocell increased the shakedown coefficient of pavements as well as but not as much as subgrade reinforcement. Results also indicated the sensitivity of shakedown coefficient and shakedown bearing capacity to intensity and shape of the contact area of different 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.
- 出版日期2018-4
