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Research on Pumping Effect in Base-Course or Subgrade on Rutting Behavior of Asphalt Pavements

基层或路基泵送效应对沥青路面车辙行为的研究

基本信息

批准号：
06650541
负责人：
NISHI Masaru
金额：
$ 1.28万
依托单位：
Kobe University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650541/
关键词：
Asphalt pavement Base-course・Subgrade Pumping phenomenon Rutting analysis

项目摘要

The objective of this research is to establish the analytical technique for the sudden increase in rutting behavior after the occurrence of surface layr cracks, from the viewpoint of the pumping phenomenon of the base layr or the subgrade. Major information obtained from each experiment and analysis in this research are listed below :1. Repeated plate loading tests using the small scale model test equipment manufactured : For both crushed aggregate as base material and masado as subgrade material, the settlements of the saturated state under plate loading were 2 to 4 times bigger than those of the wet state, depending on the testing conditions. For only the base material, confirmed as the causes for this were the development of the pumping phenomenon and its area of development.2. Materials characterization tests using the existing repeated triaxial test equipment : The resilient and permanent deformation characteristics of the saturated state and the wet state did not show any remarkable differences. Materials characterization, therefore, assuming to correspond to those whose soil elements within the pumping area had already reached static failure, were attempted. The results were approximately similar to the characteristics of loose state materials.3. Analysis of repeated plate loading test's results : The analytical results using the iterative finite element method of the wet state were comparatively good but the results of the saturated state were slightly lower than the experimental results. This is thought to be due to the small size of the loading plate which are unstable, the disregard of the increase in the specimen deformation until it reached static failure, etc.4. Rutting analysis of test pavements : In spite of the inadequacy of the analytical results explained above, the application of the above analytical technique to test pavements showed good results. This suggests the complexities of the in-situ pavement conditions.

本研究的目的是从基层或路基的泵送现象的观点出发，建立在表层裂缝发生后车辙行为突然增加的分析技术。本研究从各实验与分析中获得的主要信息如下：1.使用制造的小比例模型试验设备进行的重复平板载荷试验：对于作为基底材料的碎石和作为路基材料的碎石，在平板载荷下饱和状态的沉降比湿状态的沉降大2至4倍，取决于试验条件。对于只有基础材料，确认的原因，这是发展的泵送现象和它的发展领域。2.利用现有的重复三轴试验设备进行的材料表征试验：饱和状态和湿润状态的回弹和永久变形特性没有显示出任何显著差异。因此，试图对材料进行表征，假设其对应于泵送区域内土壤元素已达到静态破坏的材料。其结果与松散状态材料的特性近似.平板反复加载试验结果分析：湿态下的有限元迭代法分析结果较好，饱和状态下的有限元迭代法分析结果略低于试验结果。这被认为是由于加载板的尺寸小而不稳定，忽略了试样变形的增加直到达到静态破坏等。试验路面的车辙分析：尽管上述分析结果不充分，但将上述分析技术应用于试验路面显示出良好的结果。这表明现场路面条件的复杂性。