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Comparisons of asphalt pavement responses computed using layer properties backcalculated from dynamic and static approaches

机译：使用从动态和静态接近划分的层性能计算沥青路面响应的比较

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The falling weight deflectometer (FWD) testing is widely used as a nondestructive technique to backcalculate layer properties of in-situ asphalt pavement structures. Traditionally, static backcalculation methods based on the layered elastic theory (LET) are employed to analyze FWD data. However, the static method can not take into consideration the dynamic effects of the impulse loading generated in FWD testing, as well as the viscoelastic behaviour of asphalt concrete (AC). Therefore, the layer properties backcalculated from the static approach and the pavement responses computed using these layer properties are questionable. In this study, FWD tests were conducted on two asphalt pavements, one with a flexible base and the other with a semi-rigid base. The field FWD data were backcalculated using the traditional static approach and the dynamic approach which uses the spectral element method as the forward analysis engine. The elastic modulus of each layer was obtained from the static backcalculation, while in the dynamic backcalculation, the complex modulus master curve, which is the fundamental property of viscoelastic materials, was obtained for each AC layer, and elastic moduli were obtained for other layers. The two sets of backcalculated results were employed to analyze pavement responses to moving vehicular loading using the LET and layered viscoelastic theory, respectively. The results show that responses from the viscoelastic analyses are significantly larger than those from the elastic analyses except for the vertical strain at the asphalt treated base layer at high speeds. At a low speed of 16 km/h, most of the responses from the viscoelastic analyses are more than two times those from the elastic analyses. The results presented in this study pose a serious concern over the traditional approach in which both the backcalculation of FWD data and computation of pavement response to traffic loading are based on the LET.
机译：下降的重量偏转仪（FWD）测试被广泛用作非破坏性技术，以反斜原位沥青路面结构的层性质。传统上，基于分层弹性理论（假设）的静态背划分方法用于分析FWD数据。然而，静态方法不能考虑FWD测试中产生的脉冲载荷的动态效应，以及沥青混凝土（AC）的粘弹性行为。因此，由静态方法堆积的层性质和使用这些层性质计算的路面响应是可疑的。在本研究中，在两个沥青路面上进行FWD测试，一个具有柔性基座的柔性底座，另一个具有半刚性底座。使用传统的静态方法和使用频谱元素法作为前向分析引擎的动态方法来划分场FWD数据。从静态后划分中获得每层的弹性模量，而在动态止回量中，对于每个AC层获得的复杂模量曲线，即粘弹性材料的基本性质，得到了其他层的弹性模量。采用两组后划分的结果分析了使用令和分层的粘弹性理论来分析对移动车辆负荷的路面反应。结果表明，除了高速沥青处理基层的垂直应变外，来自粘弹性分析的反应显着大于来自弹性分析的反应。在16公里/小时的低速，大部分来自粘弹性分析的反应是来自弹性分析的两倍以上。本研究中提出的结果对传统方法构成了严重的关注，其中FWD数据的后划分和对交通负荷的路面响应的计算都基于让。

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