摘要
根据路面断裂力学基本理论与二维有限元方法,对开级配大粒径沥青碎石混合料(Open-graded Large Stone as-phalt Mixes,简称OLSM)缓解层沥青路面的反射裂缝扩展路径进行了数值模拟。研究表明:在轮载与温度耦合作用下,反射裂缝并非直线向上扩展,而是呈"之"字形向上延伸;尤其是在OLSM缓解层中,当裂缝扩展遇到孔隙时,其扩展路径被孔隙所阻隔而愈呈"之"字形;裂缝扩展路径愈曲折,裂缝自下而上扩展至沥青面层顶部的时间越长,从而延长了路面使用寿命。
Open-graded Large Stone asphalt Mixes（OLSM） has been recognized as an effective material to alleviate the reflective crack.According to the basic theories of pavement crack mechanics and Finite Element Modeling（FEM）,the reflective crack propagation path is numerically simulated for OLSM of asphalt pavement.The research indicates that as follows： under combined action of vehicles load and temperature,the reflective crack does not propagate in straight line upward to asphalt pavement,but propagates in ＂zigzag＂ line;especially in OLSM alleviation layer,the reflective crack propagation path is cut off by voids and getting more zigzag when it encounters voids;more zigzag the reflective crack propagation path is,longer the time that crack propagates from the bottom to the top in asphalt pavement are,therefore the service life of asphalt pavement will be prolonged.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2010年第7期72-76,共5页
Journal of Wuhan University of Technology
基金
国家西部交通建设科技项目(200631800005)
关键词
OLSM
数值模拟
裂缝扩展路径
初始扩展角
疲劳寿命
OLSM
numerical simulation
the crack propagation path
initial propagation angle
fatigue life
作者简介
郭红兵（1976-），男，博士生，讲师．E—mail：ghb200507@126．com
