排水沥青混合料各向异性空隙结构对渗水特性的影响
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摘要
为研究排水沥青混合料各向异性空隙结构对渗水特性的影响,以拓展的达西定律为理论基础,基于工业CT获取排水沥青混合料的空隙细观分布特征,建立了排水沥青混合料的渗水数值模型,并采用有限体积法分析了水在排水沥青混合料结构内部的流动特征;截取长方体试件作为特征体元来描述排水沥青混合料的各向异性渗透性能.研究表明:排水沥青混合料中空隙分布不均匀,横向的连通空隙率大于竖向,且单个空隙面积也比竖向大,空隙率的各向异性分布使得混合料试件渗透性也表现出各向异性;横向两个方向的渗透系数相近,且约为竖向的2倍;在进行渗透性分析时,在横向可把排水沥青混合料看成是各向同性体,而横向与竖向同时分析时应考虑为各向异性体.
In order to study the influence of anisotropy air voids structure in porous asphalt mixture on seepage characteristics,the theory of Darcy Law was adopted. Air voids micro-distribution characteristics of porous asphalt mixture are obtained on the basis of industrial CT,seepage flow numerical model of porous asphalt mixture is established and the internal flow characteristics of water within porous asphalt mixture are analyzed by the finite volume method. In the meantime,a cuboid test-piece is designed as a representative volume element to describe the anisotropy permeability performance of the porous asphalt mixture. The results demonstrate that the porous asphalt mixture features an uneven distribution in light of air voids,denser connecting air voids and larger area per single air void in horizontal direction than that in vertical direction. The results also indicate that because of the anisotropy of air voids,the permeability performance of the mixture sample also features anisotropy,the permeability coefficients in two horizontal directions tend to be very close,which are about two times those of the vertical directions. Thus in terms of the analysis of the permeability performance,the porous asphalt mixture can be considered as isotropy horizontally or as anisotropy when analyzed both horizontally and vertically.
In order to study the influence of anisotropy air voids structure in porous asphalt mixture on seepage characteristics,the theory of Darcy Law was adopted. Air voids micro-distribution characteristics of porous asphalt mixture are obtained on the basis of industrial CT,seepage flow numerical model of porous asphalt mixture is established and the internal flow characteristics of water within porous asphalt mixture are analyzed by the finite volume method. In the meantime,a cuboid test-piece is designed as a representative volume element to describe the anisotropy permeability performance of the porous asphalt mixture. The results demonstrate that the porous asphalt mixture features an uneven distribution in light of air voids,denser connecting air voids and larger area per single air void in horizontal direction than that in vertical direction. The results also indicate that because of the anisotropy of air voids,the permeability performance of the mixture sample also features anisotropy,the permeability coefficients in two horizontal directions tend to be very close,which are about two times those of the vertical directions. Thus in terms of the analysis of the permeability performance,the porous asphalt mixture can be considered as isotropy horizontally or as anisotropy when analyzed both horizontally and vertically.
引文
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[17]MASAD E,MUHUNTHAN B,SHASHIDHAR N,et al.Aggregate orientation and segregation in asphalt concrete[J].Geotechnical Special Publication,1998,85:69-80.
[18]MASAD E,MUHUNTHAN B,SHASHIDHAR N,et al.Internal structure characterization of asphalt concrete using image analysis[J].ASCE Journal of Computing in Civil Engineering(Special Issue on Image Processing),1999,13(2),88-99.
[2]吴旷怀,王绍怀.透水性沥青面层材料设计新法及应用[J].哈尔滨建筑大学学报,1996,29(4):111-115.WU Kuang-huai,WANG Shao-huai.Design method and applications of permeable bituminous Surface[J].Journal of Harbin University of Architecture and Engineering,1996,29(4):111-115.
[3]严军,叶奋,黄彭,等.排水沥青混合料透水性能的评价研究[J].公路交通科技,2002,19(6):35-40.YAN Jun,YE Fen,HUANG Peng,et al.Evaluation on permeability of porous asphalt mixture[J].Journal of Highway and Transportation Research and Development,2002,19(6):35-40.
[4]徐皓,倪富健,刘清泉,等.排水性沥青混合料渗透系数测试研究[J].中国公路学报,2004,17(3):1-5.XU Hao,NI Fu-jian,LIU Qing-quan,et al.Research on hydraulic conductivity of porous asphalt mixture[J].China Journal of Highway and Transport,2004,17(3):1-5.
[5]吴浩,张久鹏,王秉纲.多孔沥青混合料空隙特征与路用性能关系[J].交通运输工程学报,2010,10(1):1-5.WU Hao,ZHANG Jiu-peng,WANG Bing-gang.Relationship between characteristic of void and road performance of porous asphalt mixture[J].Journal of Traffic and Transportation Engineering,2010,10(1):1-5.
[6]易军艳,冯德成,杨振丹.基于渗水特性的沥青混合料空隙率标准[J].公路交通科技,2009,26(9):17-20.YI Jun-yan,FENG De-cheng,YANG Zhen-dan.Criterion of air voids based on permeability characteristic of asphalt mix-ture[J].Journal of Highway and Transportation Research and Development,2009,26(9):17-20.
[7]冯德成,易军艳,王东升.沥青混合料渗水特性的试验研究[J].建筑材料学报,2010,13(2):182-209.FENG De-cheng,YI Jun-yan,WANG Dong-sheng.Experimental study on permeability characteristic of asphalt mixture[J].Journal of Building Materials,2010,13(2):182-209.
[8]马翔,倪富健,王艳,等.排水性沥青混合料渗透性测试与分析[J].建筑材料学报,2009,12(2):168-173.MA Xiang,NI Fu-jian,WANG Yan,et al.Test and analysis on permeability of porous asphalt mixture[J].Journal of Building Materials,2009,12(2):168-173.
[9]张璠,陈荣生,倪富健.排水性沥青路面混合料的渗透性能试验测试技术[J].东南大学学报(自然科学版),2010,40(6):1288-1292.ZHANG Fan,Chen Rong-sheng,NI Fu-jian.Techniques of permeability testing for porous asphalt pavement mixture[J].Journal of Southeast University(Natural Science Edition),2010,40(6):1288-1292.
[10]李智,刘佳辉.基于分区OTSU法的沥青混合料图像分割技术[J].武汉理工大学学报,2011,33(6):50-53.LI Zhi,LIU Jia-hui.Segmentation of asphalt mixtures using X-ray computed tomography images based on ring block and OTSU method[J].Journal of Wuhan University of Technology,2011,33(6):50-53.
[11]肖鑫,张肖宁.基于工业CT的排水沥青混合料连通空隙特征研究[J].中国公路学报,2016,29(8):22-28.XIAO Xin,ZHANG Xiao-ning.Study on connecting void characteristics of porous asphalt mixture based on industrial CT[J].China Journal of Highway and Transport,2016,29(8):22-28.
[12]曹健.空隙率和渗透性对季冻区沥青路面路用性能的影响研究[D].吉林:吉林大学,2008.
[13]仵彦卿.多孔介质渗流与污染物迁移数学模型[M].北京:科学出版社,2012:53-123.
[14]刘双科,单明,王建永,等.颗粒堆积型多孔介质内弯曲流道毛细管束模型的研究[J].矿冶,2007,16(1):39-42.LIU Shuang-ke,SHAN Ming,WANG Jian-yong,et al.A model of capillary tube bundles for tortuous stream tube in unconsolidated porous medium with spherical particles[J].Mining&Metallurgy,2007,16(1):39-42.
[15]黄丰.多孔介质模型的三维重构研究[D].北京:中国科学技术大学,2007.
[16]肖鑫,张肖宁.基于排水沥青混合料细观结构的排水特性分析[J].华南理工大学学报(自然科学版),2016,44(6):113-120.XIAO Xin,ZHANG Xiao-ning.Analysis of drainage characteristics based on microstructure of porous asphalt mixture[J].Journal of South China University of Technology(Natural Science Edition),2016,44(6):113-120.
[17]MASAD E,MUHUNTHAN B,SHASHIDHAR N,et al.Aggregate orientation and segregation in asphalt concrete[J].Geotechnical Special Publication,1998,85:69-80.
[18]MASAD E,MUHUNTHAN B,SHASHIDHAR N,et al.Internal structure characterization of asphalt concrete using image analysis[J].ASCE Journal of Computing in Civil Engineering(Special Issue on Image Processing),1999,13(2),88-99.