ESTIMATION OF IN SITU ELASTIC MODULI OF PAVEMENT STRUCTURAL LAYER WITH FALLING-WEIGHT-DEFLECTOMETER DEFLECTION BASION. SIXTH INTERNATIONAL CONFERENCE, STRUCTURAL DESIGN OF ASPHALT PAVEMENTS, VOLUME I, PROCEEDINGS, UNIVERSITY OF MICHIGAN, JULY 13-17, 1987, ANN ARBOR, MICHIGAN
ESTIMATION OF IN SITU ELASTIC MODULI OF PAVEMENT STRUCTURAL LAYER WITH FALLING-WEIGHT-DEFLECTOMETER DEFLECTION BASION. SIXTH INTERNATIONAL CONFERENCE, STRUCTURAL DESIGN OF ASPHALT PAVEMENTS, VOLUME I, PROCEEDINGS, UNIVERSITY OF MICHIGAN, JULY 13-17, 1987, ANN ARBOR, MICHIGAN
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用落锤式弯沉仪挠度基座估算路面结构层的原位弹性模量。
DOI：
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发表时间：
1987
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影响因子：
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通讯作者：
T. Sugawara
中科院分区：
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作者：
A. Kasahara;H. Kubo;T. Sugawara
本文介绍了路基（E3）、粒料底基层（E2）和沥青结合层（E1）弹性模量的估算方法。本研究充分利用SAS-BISAR系统，利用FWD测试装置测得的弯沉数据D sub 0、D sub 300、D sub 750（足够表示距加载板中心的距离，单位为mm），将路面简化为三层结构。SAS-BISAR系统是将BISAR与超级应用系统（SAS）相结合而实现的。BISAR是一种多层弹性分析方法，SAS是美国SAS研究所开发的一种统计软件，具有数据管理和图形绘制功能。首先，我们试图找到最合适的挠度变量估计的弹性系数的每一层的路面。D sub 750和（D sub 300 - D sub 750）之间的关系对于估计E3的值是有用的。以类似的方式，E2的估计需要D sub 750和（D sub 0 - D sub 300）之间的关系以及偏差（D sub 0 - D sub 300）。通过使用Dsub 0和E1之间的关系，可以估计整个沥青粘结层的弹性模量（E1）。整个沥青结合层的弹性模量，上述引用，有很好的一致性，在动态间接拉伸试验中得到的弹性模量的沥青混合料，加载时间为FWD。在已知E1的情况下，给出了E2和E3的相对简单的估计方法。在该方法中，利用SAS-BISAR系统绘制了Δ sub 750与（Δ sub 300 -Δ 750）之间的关系图。在该图上绘制实际测量的值D sub 750和（D sub 300 - D sub 750），通过插值来估计E2和E3。利用该方法对不同沥青路面结构的E2和E3进行了估算。
This paper describes the estimation method of the elastic moduli of a subgrade (E3), a granular subbase (E2) and an asphalt bound layer (E1). In this study, SAS-BISAR system is fully utilized and the pavement is simplified into three-layer structure by using deflection data, i.e. D sub 0, D sub 300, D sub 750, (suffices denote distances in mm from the center of the loading plate), which are obtained by the testing device of FWD. SAS-BISAR system was accomplished by combining BISAR and Super Application System (SAS). BISAR is an elastic analysis method for multi-layer, and SAS is a statistical software, which was developed by SAS Institute in U.S.A. and has valuable functions for data management and drawing figures. First, we attempt to find the most appropriate deflection variables for estimating the elastic coefficient of each layer of the pavement. The relation between D sub 750 and (D sub 300 - D sub 750) is useful to estimate the value of E3. In a similar way, the relation between D sub 750 and (D sub 0 - D sub 300), and the deviation (D sub 0 - D sub 300) are required for the estimation of E2. It becomes possible to estimate the elastic modulus of the whole asphalt bound layer (E1) by using the relation between D sub 0 and E1. The elastic modulus of the whole asphalt bound layer, cited above, has a good agreement with the elastic modulus of the asphalt mixture which was obtained in the dynamic indirect tension test with a loading time of FWD. We propose the relatively simple estimating method of E2 and E3 with the known variable E1. In this method, a diagram of the relation between delta sub 750 and (delta sub 300 - delta 750) is drawn by the use of SAS-BISAR system. Plotting D sub 750 and (D sub 300 - D sub 750), values which are actually measured, on this figure, E2 and E3 are estimated by interpolation. By the use of this method E2 and E3 are estimated for various kinds of the asphalt pavement structure.