长沙理工大学学报（自然科学版）2023，Vol.20Issue(6)：69-79,11.DOI:10.19951/j.cnki.1672-9331.20230724001
车-温耦合作用下沥青路面反射裂缝开裂影响因素研究
Study on the influence factors of reflective cracking in asphalt pavement under the vehicle-temperature coupling effect
摘要
Abstract
[Purposes]In order to explore the factors that affect the reflective cracks on asphalt pavement,this study attempts to analyze the stress changes inside the road under different temperatures.[Method]First,the reflective cracks at the bottom of the semi-rigid base were selected as the research object,and the stress intensity factor and J-integral of the tip of the reflective cracks were used as the evaluation indexes.Then,a generalized Maxwell model was established based on the finite element method to analyze the stress changes inside the road under the action of temperature.Finally,The change laws of the evaluation index of reflective crack tip in semi-rigid base course under different tire pressure,vehicle speed and temperature-driving load coupling were explored.[Findings]According to the evaluation index comparison,when the vehicle speed increased from 30 km/h to 150 km/h,the maximum values of the stress intensity factors(mode I and modeⅡ)decreased by 2.79%and 5.62%respectively.Compared to the driving speed of 150 km/h,the J-integral corresponding to 30 km/h increased by 18.0%.When the tire contant pressures increased from 0.5 MPa to 1.3 MPa,both the maximum values of the stress intensity factors(mode I and mode Ⅱ)increased by 160%.The impact of tire contant pressure on the stress intensity factor of reflective cracks was greater than that of driving speed.Under the vehicle-temperature coupling conditions,the stress intensity factor of mode I was consistently higher than that of mode Ⅱ,and the cracking of transverse reflective cracks in the asphalt pavement base was a composite crack dominated by mode I.The value of the J-integral was 3.6×10-3 N/m under low temperature-load conditions,and the value was significantly higher than that of high temperature-load and load acting alone.[Conclusions]Low temperature and overload have the most significant impact on the propagation of reflective cracks on the pavement,and the detection of reflective cracks on asphalt pavement should be strengthened in winter.关键词
道路工程/反射裂缝/车-温耦合/有限元/应力强度因子/J积分Key words
road engineering/reflective crack/vehicle-temperature coupling/finite element/stress intensity factor/J-integral分类
交通工程引用本文复制引用
司春棣,凡涛涛,曹航,周巍,康兴,张宇..车-温耦合作用下沥青路面反射裂缝开裂影响因素研究[J].长沙理工大学学报（自然科学版）,2023,20(6):69-79,11.基金项目
国家自然科学基金资助项目(11972237) （11972237）
河北省交通厅科技计划项目(JD-202007、JD-202006、JX-202010) Project(11972237)supported by the National Natural Science Foundation of China （JD-202007、JD-202006、JX-202010）
Projects(JD-202007,JD-202006,JX-202010)supported by Science and Technology Program of Department of Transportation of Hebei Province （JD-202007,JD-202006,JX-202010）
