摘要
为了解决刚性基层沥青路面存在的沥青面层反射裂缝问题,提出了采用开级配大粒径沥青碎石混合料(Opengraded Large Stone Asphalt Mixes,OLSM)作为裂缝缓解层的方法,以国内外OLSM参考级配为基础,结合试验段修筑情况,采用二维有限元方法,建立设置OLSM-25裂缝缓解层的沥青路面有限元模型,对设置不同类型裂缝缓解层、不同级配OLSM-25裂缝缓解层的沥青路面进行疲劳分析,从宏观力学响应方面阐释了OLSM-25裂缝缓解层的抗裂机理。结果表明:在车辆荷载偏载作用下,与相同厚度的普通AC-25裂缝缓解层相比,采用OLSM-25裂缝缓解层可有效减缓基层裂缝的扩展速率,显著提高沥青路面结构的疲劳寿命,OLSM-25裂缝缓解层的抗裂效果优于普通AC-25裂缝缓解层。
In order to solve the problem of the reflective cracking in the rigid base asphalt pavement,a method using open-graded large stone asphalt mixes（OLSM）as the crack relief layer was proposed.On the basis of the reference gradation of OLSM in the domestic and international combined with the test roads construction by using two-dimensional finite element method,the finite element model of asphalt pavement structure with OLSM-25 cracking relief layer was established,fatigue analysis on asphalt pavement with two different types of cracking relief layer,and three different gradations OLSM-25 cracking relief layer were carried out,and the anti-crack mechanism of OLSM-25 cracking relief layer was illustrated from the aspects of macro mechanical response.The experimental result indicated that under the action of the asymmetric traffic load,compared to the ordinary AC-25 cracking relief layer with the same thickness,the propagating speed of the reflective crack would be slow down effectively by using the cracking relief layer of OLSM-25,and the fatigue life of the asphalt pavement structure would be improved significantly,and the anti-cracking effect of OLSM-25 cracking relief layer was better than that of ordinary AC-25 cracking relief layer.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2014年第10期52-56,共5页
Journal of Wuhan University of Technology
基金
陕西省教育厅专项科研计划(14JK1067)
中央高校基本科研业务费专项资金项目(CHD 2010JC011)
关键词
道路工程
开级配大粒径沥青碎石
二维有限元
疲劳寿命
抗裂机理
数值分析
应力强度因子
road engineering
open-graded large stone asphalt mixes
two-dimensional finite element
fatigue life
anti-cracking mechanism
numerical analysis
stress intensity factor
