摘要
运用断裂力学的相关理论,结合有限元方法,建立含表面裂缝的沥青路面结构三维有限元模型,计算了表面裂缝尖端的应力强度因子,通过分析裂缝的疲劳扩展来预测沥青路面的使用寿命。研究结果表明:表面裂纹形成初期,水平荷载对路面表面裂缝扩展影响较大。裂纹扩展阶段,张开型破坏占裂纹扩展的主导作用;增加面层厚度能有效抑制沥青路层裂缝的扩展;面层厚度增加,基层厚度增加,基层模量增大,面层模量降低,沥青路面疲劳寿命增速越大,疲劳寿命越长,但基层模量增加过大,易导致路面干缩开裂。
in this paper, on the theory of fracture mechanics, combined with the finite element method, set up including surface crack of asphalt pavement structure three dimensional finite element model, calculated the surface crack tip stress intensity factor, through the analysis of the fatigue of crack extension to predict the service life of the asphalt road surface. The results show that the early crack for- mation on the surface, the horizontal load influence of pavement surface crack propagation. Crack propa- gation stage, open type damage of crack extension of leading role ; Increase the thickness of surface layer can effectively inhibit the asphalt layer crack extension; Layer thickness increase, the base thickness in- crease, the primary modulus increases, the surface modulus is reduced, the greater the fatigue life of as- phalt pavement growth, the longer the fatigue life, but at the grassroots level modulus increase is too large, easy to cause road surface drying shrinkage cracking.
出处
《公路工程》
北大核心
2017年第2期278-283,325,共7页
Highway Engineering
基金
山西省基础研究项目(2015020174)
关键词
沥青路面
应力强度因子
疲劳寿命
asphalt pavement
stress intensity factor
the fatigue life
