基于空隙分布特征的排水沥青混合料渗透特性分析  

Permeability Analysis of Drainage Asphalt Mixture Based on Void Distribution Characteristics

作　　者：李自齐 杨小龙[1] 许云龙 LI Zi-qi;YANG Xiao-long;XU Yun-long(College of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学土木工程学院

出　　处：《兰州工业学院学报》2020年第1期28-32,47,共6页Journal of Lanzhou Institute of Technology

摘　　要：为了更精确、全面地描述排水性沥青混合料的空隙信息,采用CT扫描结合数字图像处理技术获取混合料的内部空隙三维分布,对空隙率、连通空隙率、空隙个数、空隙等效直径等进行了定量分析,提取出连通空隙进行渗透模拟分析,并对常规试验结果与三维结果进行了对比.结果表明:CT扫描与数字图像技术相结合的方法比较可靠;3种不同空隙率混合料的横向绝对渗透率均大于竖向渗透率,且试件两端的渗透率大于中间.In order to describe the void information of the drainage asphalt mixture more accurately and comprehensively,an X-ray CT combined with digital image processing technology is used to obtain the three-dimensional distribution of internal voids of the mixture in this paper.The void ratio,the connected void ratio,the number of voids,and the equivalent diameter of the void were quantitatively analyzed,and the connected voids were extracted for permeation simulation analysis.By comparing the void ratio and connected void ratio obtained from the laboratory test and three-dimensional reconstruction,the X-ray combined with digital image technology is more reliable.Through permeability simulation analysis,it is found that the transverse absolute permeability of the mixtures is greater than the vertical permeability,and the permeability at both ends of the specimen is greater than that in the middle.

关 键 词：排水沥青混合料 三维重构 空隙分布 绝对渗透率 

分 类 号：U416[交通运输工程—道路与铁道工程]