摘要
为了减缓沥青路面表面裂缝,基于断裂力学理论并应用有限元软件ABAQUS,建立了20节点等参元有限元模型,对路面表面裂缝进行数值计算,且采用Paris公式预测了表面裂缝扩展寿命,分析探讨了应力强度因子K2在表面裂缝扩展过程中的变化规律及路面结构参数对表面裂缝疲劳寿命的影响。计算表明:(1)表面裂缝的扩展只考虑偏荷载作用,在裂缝的扩展过程中,随着表面裂缝向下不断的扩展,其K2增大到一个峰值后,再缓慢下降。(2)在路面结构参数正常取值的范围内,对表面裂缝扩展寿命影响较大的是面层厚度、面层模量、基层模量,而土基模量、底基层厚度、底基层模量、基层厚度对表面裂缝扩展寿命的影响很小。
Focusing on the severity of asphalt pavement surface crack, a finite element analysis model of 20-node isoparametric elements is established with the commerce FEM software ABAQUS and based on fracture mechanics theory.The surface crack of pavement is numerical analyzed and the crack propagation life is evaluated by Paris formula. In the course of surface crack propagation the change of the stress intensity factor （K2） is discussed and the effect of pavement parameters on surface crack fatigue life is studied.The analysis indicates： （1） the propagation of surface crack is dominated by deflection load.In the course of crack propagation, at first K2 increases to the top then drops down slowly. （2） the important influence factors to the surface crack propagation life at the scope of road structure parameter are thickness and modulus of surface course, and the modulus of base course. But modulus of subsoil, thickness and modulus of subbase course and thickness of base course are of no effect.
出处
《公路交通科技》
CAS
CSCD
北大核心
2007年第7期10-14,共5页
Journal of Highway and Transportation Research and Development
基金
南京林业大学高学历人才基金资助项目(163050020)
关键词
道路工程
沥青路面
有限元
断裂力学
表面裂缝
疲劳寿命
road engineering
asphalt pavement
finite element method
fracture mechanics
surface crack
fatigue life
