基于分形理论的沥青路面层间机械摩阻强度行为  

Mechanical friction intensity behavior of asphalt pavement based on fractal theory

作　　者：毛昱[1] 李萍[1] 念腾飞 林梅[1] 魏西应 MAO Yu;LI Ping;NIAN Teng-fei;LIN Mei;WEI Xi-ying(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学土木工程学院,兰州730050

出　　处：《吉林大学学报（工学版）》2020年第2期594-605,共12页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51868047,51668041).

摘　　要：为沥青路面层间抗剪切设计及施工提供参考,针对现有沥青路面的结构层组合形式,研究了不同级配结构层组合类型沥青路面层间机械摩阻强度。首先,基于分形理论建立沥青路面层间机械摩阻强度理论模型,并分析了不同级配结构层组合形式的沥青路面机械摩阻强度特性;其次,为验证该理论模型的可靠性,进行了不同级配结构层组合类型的沥青路面剪切试验。结果表明:层间接触表面形态受沥青混合料级配影响较大,其中,级配组合类型为AC-13/AC-16的接触面积最大,然后依次为AC-13/AC-20、AC-16/AC-20;在相同荷载作用下,层间机械摩阻强度受上、下层级配结构层组合类型影响较大,级配结构层组合类型为AC-13/AC-20时,层间机械摩阻强度最大,然后依次为AC-16/AC-20、AC-13/AC-16;在温度为20℃时,层间机械摩阻强度理论值与试验值较接近,表明在该条件下沥青路面层间机械摩阻强度理论模型具有一定的可靠性与适用性。In order to provide reference for the anti-shear design and construction of asphalt pavement layer,the mechanical frictional strength between layers of asphalt pavements with different grades of structural layers was studied based on the structural layer combination of existing asphalt pavements in this study. Firstly,the theoretical model of mechanical frictional resistance between asphalt pavement layers is established based on the fractal theory,and the mechanical frictional strength characteristics of asphalt pavement with different grading structural layers combinations are analyzed. Furthermore,the shear tests of asphalt pavement with different grading structural layer combinations were carried out in order to verify the reliability of the theoretical model. The results show that the interlayer surface morphology is greatly affected by the gradation of asphalt mixture. Among them,the gradation combination type AC-13/AC-16 has the largest contact area,followed by AC-13/AC-20 and AC-16/AC-20. The mechanical frictional strength between layers is greatly affected by the combination of upper and lower gradation structure layers under the same load,and the gradation structure layer combination type AC-13/AC-20 has the largest interlayer mechanical friction strength,followed by AC-16/AC-20 and AC-13/AC-16. The theoretical value of the mechanical frictional strength among the interlayers is fitting to the experimental value at the temperature of 20 °C,which indicates that the theoretical model of the mechanical frictional strength among the asphalt pavement interlayers has certain reliability and applicability under this condition.

关 键 词：沥青路面 分形理论 接触面积 抗剪强度 机械摩阻强度 

分 类 号：U414[交通运输工程—道路与铁道工程]