半刚性基层开裂后沥青路面寿命预估方法研究  

Prediction Method of Asphalt Pavement Life after Semi-rigid Base Cracking

作　　者：房娜仁 胡士清 吴朝玥 孙耀宁 韩金川 FANG Naren;HU Shiqing;WU Zhaoyue;SUN Yaoning;HAN Jinchuan(School of Civil Engineering,Tianjin Chengjian University,Tianjin 300384,China;CCCC Second Highway Consultants Co.,Ltd.,Wuhan 430056,Hubei,China;China Highway Engineering Consulting Group Co.,Ltd.,Beijing 100000,China;School of Highway,Chang'an University,Xi'an 710064,Shaanxi,China;Tianjin Saiying Engineering Technology Consulting Co.,Ltd.,Tianjin 300384,China)

机构地区：[1]天津城建大学土木工程学院,天津300384 [2]中交第二公路勘察设计研究院有限公司,湖北武汉430056 [3]中国公路工程咨询集团有限公司,北京100000 [4]长安大学公路学院,陕西西安710064 [5]天津市赛英工程技术咨询有限公司,天津300384

出　　处：《重庆交通大学学报（自然科学版）》2023年第10期45-52,共8页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：天津市交通运输科技发展计划项目(2022-08);天津市教委科研计划项目(2020KJ038);天津市自然科学基金青年项目(22JCQNJC01550)。

摘　　要：依据“半刚性基层沥青路面疲劳寿命由裂缝产生和裂缝扩展两阶段组成”这一路面疲劳寿命预估准则,提出以防治反射裂缝为目的的半刚性基层沥青路面疲劳寿命预估方程,该方程由起裂阶段寿命和裂缝扩展阶段寿命两部分组成,并以喀叶墨高速公路为例验证了该方程的准确性。结果表明:温度荷载作用下应力强度因子K_(1)明显小于交通荷载作用时产生的剪切型应力强度因子K_(2);反射裂缝扩展过程中,裂缝扩展前期受温度和荷载共同影响,后期主要受交通荷载的影响;在半刚性基层出现贯穿裂缝的情况下,路面起裂寿命很小,几乎可以忽略不计,因此裂缝处对应的沥青层底很容易开裂;在裂缝扩展阶段,面层厚度对半刚性基层沥青路面反射裂缝扩展寿命影响最大,其次为面层模量,基层厚度和模量对其影响较小。因此可通过增大面层厚度或减小面层模量的方式,提高半刚性基层沥青路面使用寿命。According to the pavement fatigue life prediction criterion that the fatigue life of semi-rigid base asphalt pavement consists of two stages such as crack generation and crack propagation,the fatigue life prediction equation of semi-rigid base asphalt pavement for the purpose of preventing reflective cracks was proposed.The proposed equation was composed of two parts:the life of the crack initiation stage and the life of the crack propagation stage.The accuracy of the proposed equation was verified by taking Kayemo Expressway as an example.The results show that the stress intensity factor K_(1) under the action of temperature load is significantly smaller than the shear-type stress intensity factor K_(2) produced under the action of traffic load.In the process of reflective crack propagation,the crack propagation is affected by temperature and load in the early stage and is mainly affected by traffic load in the later stage.In the case of penetrating cracks in the semi-rigid base course,the crack initiation life of the pavement is very small and almost negligible,so the corresponding asphalt layer bottom at the crack is easy to crack.In the crack propagation stage,the thickness of the surface layer has the greatest impact on the reflective crack propagation life of the semi-rigid base asphalt pavement,followed by the surface layer modulus;the thickness and modulus of the base layer have little effect on it.Therefore,the service life of semi-rigid base asphalt pavement can be increased by increasing the thickness of the surface layer or reducing the surface layer modulus.

关 键 词：道路工程 半刚性基层沥青路面 寿命预估 Paris公式 反射裂缝 

分 类 号：U416.2[交通运输工程—道路与铁道工程]