MLS66重载-高频加载下沥青路面应变行为分析

发布时间：2018-04-17 04:38

本文选题：道路工程 + 沥青路面　；参考：《中国公路学报》2014年10期

【摘要】：为考察半刚性基层沥青路面在超重高频动载及环境温度交互作用下的力学响应状况,采用MLS66在高温及常温条件下进行半轴超载50%的足尺加速加载试验。结合加载次数、温度、模量等参数,分析了可控荷载条件下路面结构层底部三向瞬时及累积应变响应的空间分布及时程变化,并对实测值与计算值进行了对比分析。结果表明:面层底部瞬时应变实测值大于计算值,基层中两者较吻合;纵向瞬时应变比为1/5~1/2,且温度越高,应变比越小;高温下瞬时应变幅值为常温下的2~6倍;面层纵向应变温度系数约为横向的2倍,基层(底基层)的三向应变温度系数大致相同;瞬时应变幅值和应变温度系数与路面深度分别呈幂指数、负线性关系;加载次数与累积应变、地震波模量呈双对数线性关系,可用于沥青面层疲劳预估。
[Abstract]:In order to investigate the mechanical response of semi-rigid base asphalt pavement under the interaction of heavy and high frequency dynamic load and ambient temperature, MLS66 was used to carry out 50% full-scale accelerated loading test of semi-rigid base asphalt pavement under high and normal temperature.Combined with the parameters such as loading times, temperature and modulus, the spatial distribution of the transient and cumulative strain response at the bottom of the pavement structure under controllable load is analyzed, and the measured and calculated values are compared and analyzed.The results show that the measured value of the instantaneous strain at the bottom of the surface layer is larger than the calculated value, and the measured value of the instantaneous strain in the base is more consistent, the longitudinal instantaneous strain ratio is 1 / 5 / 1 / 2, and the higher the temperature, the smaller the strain ratio, and the amplitude of the instantaneous strain at high temperature is 2 ~ 6 times of that at normal temperature.The longitudinal strain temperature coefficient of the surface layer is about 2 times of that of the transverse layer, the triaxial strain temperature coefficient of the base (bottom base) is approximately the same, the instantaneous strain amplitude and the strain temperature coefficient have a power exponent and a negative linear relationship with the road depth, respectively.The loading times have a logarithmic linear relationship with the cumulative strain and the seismic wave modulus, which can be used to predict the fatigue of asphalt surface.
【作者单位】：同济大学道路与交通工程教育部重点实验室;新疆大学建筑工程学院;
【基金】：国家自然科学基金项目(51168044)
【分类号】：U416.217

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