基于季节时温的沥青路面温荷耦合动力性能分析

发布时间：2018-07-06 18:52

本文选题：沥青路面 + 温度荷载　；参考：《华南理工大学学报(自然科学版)》2017年04期

【摘要】：为探究大温差地区季节时温变化对沥青路面性能的影响规律,考虑沥青混凝土的时温粘弹性,采用数值模拟方法,针对两种典型沥青路面结构——水泥稳定碎石半刚性基层(结构S1)及级配碎石柔性基层(结构S2)进行了基于季节时温变化的路面结构温荷耦合动力行为与性能分析.结果表明:随轴重增加、动载频率降低、水平推力方向由与行车方向相反变为与行车方向相同以及层间状态恶化,沥青层层底应力总体呈增大趋势,疲劳寿命逐渐降低;路面温度分布的变化对各结构层拉应力的影响表现为夏季显著而冬季不显著,且对于面层层底拉应力,夏季小于冬季,高温时刻小于低温时刻,基层拉应力则表现出相反的变化趋势;虽然结构S1的沥青层在不同时温下的疲劳寿命优于结构S2,但存在随时温改变而急剧波动的不足;相反,结构S2波动小,性能稳定,具有更好的环境适应性.
[Abstract]:In order to investigate the influence of seasonal temperature variation on asphalt pavement performance in large temperature difference region, considering the time-temperature viscoelasticity of asphalt concrete, the numerical simulation method is adopted. Two typical asphalt pavement structures, cement stabilized macadam semi-rigid base (structure S1) and graded macadam flexible base (structure S2), are studied in this paper. The dynamic behavior and performance of temperature load coupling of pavement structure based on seasonal temperature variation are analyzed. The results show that with the increase of axle load, the frequency of dynamic load decreases, the direction of horizontal thrust changes from the opposite direction to the same direction and the interlayer state deteriorates, the stress of asphalt layer bottom increases and the fatigue life decreases gradually. The influence of the change of pavement temperature distribution on the tensile stress of each structure layer is obvious in summer but not significant in winter. For the surface layer bottom tensile stress, summer is less than winter, and high temperature is less than low temperature. Although the fatigue life of the asphalt layer of structure S1 is better than that of structure S2 at different temperature, there is a shortage of sharp fluctuation due to the change of temperature at any time, on the contrary, the fluctuation of structure S2 is small and the performance is stable. It has better environmental adaptability.
【作者单位】：西南交通大学土木工程学院;道路工程四川省重点实验室;中铁第四勘察设计院集团有限公司;
【基金】：国家自然科学基金资助项目(51378438) 西南交通大学中央高校基本科研业务费专项资金资助项目(SWJTU12ZT05)~~
【分类号】：U416.217

【相似文献】