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Soil Resilient Modulus Regressed from Physical Properties and Influence of Seasonal Variation on Asphalt Pavement Performance
| 题名： | Soil Resilient Modulus Regressed from Physical Properties and Influence of Seasonal Variation on Asphalt Pavement Performance |
| 其他题名： | Ahn,J.,Cote,B.M.,Robinson,B.,Gabr,M.A.,and Borden,R.H.(2009)."Inverse analysis of plate load tests to assess subgrade resilient modulus."Transportation Research Record 2101,Transportation Research Board,National Research Council,Washington,DC,110-117. |
| 正文语种： | 英文 |
| 作者： | Changjun Zhou |
| 关键词： | Subgrade;Resilient modulus;Mechanistic-Empirical Pavement Design Guide (MEPDG);Generalized model;Coefficients;Seasonal moisture variation |
| 摘要： | Subgrade soil, as the critical underlying support for other pavement layers and traffic loads, should be stiff enough to maintain the integrity of pavement structures and the smoothness of pavement surface. The resilient modulus, as an indicator of subgrade stiffness, is an essential input in the AASHTO Mechanistic-Empirical Pavement Design Guide (MEPDG). At input level 1 of MEPDG, the MEPDG generalized model is required to describe resilient modulus of subgrade soil, and the coefficients of this model are used for pavement design. The change of the resilient modulus model has raised the interest of many state highway agencies and made it necessary to convert old resilient modulus test data into new ones required for the MEPDG model. In this study, the coefficients of the generalized and the universal models for soil resilient modulus were obtained through regression of the results of 13 soils in Tennessee. The coefficients of the two models were also compared. There is a potential risk that the coefficients from the universal model may be mistakenly used in the MEPDG instead of those coefficients from the generalized model. The consequence of this improper use was demonstrated in the comparison between the miscalculated and the real resilient moduli. The coefficients of the generalized model were correlated to soil physical properties, which provided an alternate time-saving and economical method to obtain soil resilient modulus as level 2 inputs. The coefficients were obtained at different post-compaction water contents, to allow the estimation of pavement response under seasonal moisture variation of subgrade. Rutting and roughness of two typical pavement sections were analyzed to investigate the influence of the seasonal variation of soil resilient modulus on pavement performance. The results showed that moisture variation had a significant effect on subgrade resilient modulus and, subsequently, on pavement performance. It is recommended that seasonal change in soil resilient modulus be considered in the analysis on pavement performance. |
| 出版年： | 2015 |
| 论文唯一标识： | P-72Y2015V141N01006 |
| 英文栏目名称： | Technical Papers |
| doi： | 10.1061/(ASCE)TE.1943-5436.0000727 |
| 期刊名称： | Journal of Transportation Engineering |
| 拼音刊名(出版物代码)： | P-72 |
| 卷： | 141 |
| 期： | 01 |
| 页码： | 35-43 |
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