Soil Resilient Modulus Regressed from Physical Properties and Influence of Seasonal Variation on Asphalt Pavement Performance
Soil Resilient Modulus Regressed from Physical Properties and Influence of Seasonal Variation on Asphalt Pavement Performance
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DOI：
10.1061/(asce)te.1943-5436.0000727
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Changjun Zhou;Baoshan Huang;E. Drumm;X. Shu;Qiao Dong;S. Udeh
中科院分区：
文献类型：
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作者：
Changjun Zhou;Baoshan Huang;E. Drumm;X. Shu;Qiao Dong;S. Udeh
路基土作为其他路面层和交通荷载的关键底层支撑，应具有足够的硬度，以保持路面结构的完整性和路面的光滑度。弹性模量作为路基刚度的指标，是美国国家公路和运输官员协会 (AASHTO) 力学经验路面设计指南 (MEPDG) 的重要输入内容。在MEPDG的输入级别1，需要MEPDG广义模型来描述路基土的回弹模量，并使用该模型的系数进行路面设计。弹性模量模型的变化引起了许多州公路机构的兴趣，并且有必要将旧的弹性模量测试数据转换为 MEPDG 模型所需的新数据。本研究通过对田纳西州 13 种土壤的结果进行回归，得到了土壤回弹模量的广义模型和通用模型的系数。还比较了两个模型的系数。存在潜在风险，即 MEPDG 中可能会错误地使用通用模型的系数，而不是广义模型的系数。这种使用不当的后果在错误计算的弹性模量与真实弹性模量之间的比较中得到了证明。广义模型的系数与土壤物理性质相关，这提供了另一种省时且经济的方法来获取土壤弹性模量作为二级输入。在不同的压实后含水量下获得系数，以便估计路基季节性湿度变化下的路面响应。通过对两个典型路面路段的车辙和粗糙度进行分析，探讨土壤回弹性模量季节变化对路面性能的影响。结果表明，湿度变化对路基回弹模量以及随后的路面性能有显着影响。建议在路面性能分析中考虑土壤回弹性模量的季节变化。
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 American Association of State Highway and Transportation Officials (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.