加速加载下沥青路面地震波模量分析

发布时间：2018-04-12 13:09

本文选题：道路工程 + 沥青路面　；参考：《公路交通科技》2014年06期

【摘要】：为探索沥青路面地震波模量与路面响应的关系,在细砂路基上的半刚性基层沥青路面进行了MLS66足尺加速加载试验,同时进行了加载区域地震波模量的测试,分析了地震波模量与加载次数、路面温度、车辙变形以及沥青面层底部拉应变的定性或定量关系。结果表明:在加速加载试验过程中,地震波模量随加载次数的衰减过程大致可分为迅速衰减及稳定降低阶段,前一阶段中平均衰减速度为0.1 GPa/万次,模量减少值约占总地震波模量降低值的75%,后一阶段衰减速率降低一个数量级;地震波模量与车辙永久变形呈二次多项式关系;地震波模量与上面层层底温度的变化趋势相反,多项式模拟可较好地表达二者关系;地震波模量与面层层底纵、横向应变变化趋势相反,且变化程度相当。
[Abstract]:In order to explore the relationship between seismic wave modulus and pavement response of asphalt pavement, the MLS66 full-scale accelerated loading test was carried out on the semi-rigid base asphalt pavement on fine sand subgrade, and the seismic wave modulus of the loading region was tested at the same time.The qualitative and quantitative relationships between seismic wave modulus and loading times, pavement temperature, rut deformation and tensile strain at the bottom of asphalt surface are analyzed.The results show that during the accelerated loading test, the attenuation process of seismic wave modulus with loading times can be roughly divided into two stages: rapid attenuation and steady reduction, and the average attenuation rate in the previous stage is 0.1 GPa/.The decrease value of seismic wave modulus is about 75 percent of the decrease value of the total seismic wave modulus, the attenuation rate of the latter stage is reduced by one order of magnitude, the seismic wave modulus and the rut permanent deformation show a quadratic polynomial relation, and the seismic wave modulus is opposite to the change trend of the temperature at the bottom of the upper layer.Polynomial simulation can better express the relationship between them, and the variation trend of seismic wave modulus is opposite to that of horizontal strain, and the variation degree is equal.
【作者单位】：长沙理工大学;上海市市政规划设计研究院;
【基金】：上海市科委重点科技基金项目(08201202400)
【分类号】：U416.217

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