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首页> 外文会议>Airfield and Highway Pavement Specialty Conference; 20060430-0503; Atlanta,GA(US) >Measured and Theoretical Pressures in Base and Subgrade Layers Under Dynamic Truck Loading
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Measured and Theoretical Pressures in Base and Subgrade Layers Under Dynamic Truck Loading

机译：卡车动态载荷下基础层和路基层的实测压力和理论压力

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As mechanistic-empirical (M-E) design continues to advance toward full implementation by state agencies, there is a need to assess the accuracy of the load-response models under dynamic truck loading. The load response model is a core component of flexible pavement M-E design and the common practice is to use a layered elastic approach to predict pavement responses under load. Concerns regarding accuracy of this type of model arise when considering unbound materials exhibiting non-linear behavior, viscoelastic hot-mix asphalt (HMA) materials and dynamic loads applied by moving traffic. Despite this, layered elastic models continue to be the state-of-the practice for most pavement design and analysis applications. The objective of this study was to assess the accuracy of a layered elastic model with respect to measured pavement responses under live traffic. Specifically, eight test sections at the National Center for Asphalt Technology (NCAT) Test Track were instrumented to measure vertical pressures in the unbound base and subgrade layers. The test sections consisted of various HMA thicknesses and used modified and unmodified asphalt binders. Material properties were established using backcalculation of falling weight deflectometer (FWD) data. The test sections were then simulated with the layered elastic computer program, WESLEA. The simulations also included actual loading configurations applied by the tractor-triple and single trailer vehicles used at the Test Track. The study focused on in-tact pavements (i.e., no cracking) and comparisons between theoretical and measured pavement responses were made over a wide range of environmental conditions and the two different truck load configurations. A unique approach was developed to account for the natural wander of the vehicles relative to the fixed location of the pressure gauges. The measured responses were generally within 15% of theoretical with a strong correlation between the two sets of data (R~2 > 0.80). In general, the results from layered elastic back and forward-calculation compared well with measured pavement responses obtained from the NCAT Test Track data. At higher pressures, which are resulting from higher pavement temperature, some deviations were observed between predicted and measured responses in this study.
机译：随着机械经验（M-E）设计继续朝着国家机构全面实施的方向发展，有必要评估动态卡车装载下的载荷响应模型的准确性。荷载响应模型是柔性路面M-E设计的核心组成部分，通常的做法是使用分层弹性方法来预测荷载作用下的路面响应。当考虑表现出非线性行为的未粘合材料，粘弹性热混合沥青（HMA）材料以及移动交通施加的动态载荷时，会出现有关此类模型准确性的问题。尽管如此，对于大多数路面设计和分析应用来说，分层弹性模型仍然是最新的实践。这项研究的目的是评估在实时交通情况下，分层弹性模型相对于实测路面响应的准确性。具体而言，在美国国家沥青技术中心（NCAT）测试轨道上的八个测试部分均已安装了仪器，以测量未结合的基础层和路基层中的垂直压力。测试部分由各种HMA厚度组成，并使用改性和未改性的沥青粘合剂。材料性能的确定是通过对落锤挠度计（FWD）数据进行反算来确定的。然后用分层的弹性计算机程序WESLEA模拟测试部分。模拟还包括在测试跑道上使用的牵引三轮车和单拖车的实际装载配置。该研究的重点是完好的路面（即无开裂），并且在各种环境条件下以及两种不同的卡车负载配置下，对理论路面和实测路面的响应进行了比较。开发了一种独特的方法来解决车辆相对于压力表固定位置的自然漂移。测得的响应通常在理论值的15％以内，两组数据之间具有很强的相关性（R〜2> 0.80）。通常，将分层弹性后移和前移计算的结果与从NCAT测试轨迹数据获得的实测路面响应进行比较。在较高的压力下（由较高的路面温度引起），在这项研究中观察到了预测响应与实测响应之间的一些偏差。

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