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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。
In order to explore the relation between the seismic modulus of asphalt pavement and the pavement response, the MLS66 full-scale accelerated loading test was carried out on the semi-rigid base asphalt pavement on the fine sand foundation. At the same time, the seismic modulus of the loading area was tested. Loading times, pavement temperature, rutting deformation and the tensile strain at the bottom of asphalt pavement qualitative or quantitative relationship. The results show that during the accelerated loading test, the modulus of seismic wave can be roughly divided into the rapid decay and steady decrease phases with the decay of loading times. The average decay rate in the previous stage is 0.1 GPa / The total seismic wave modulus decreases by 75%, and the decay rate decreases by an order of magnitude in the latter stage. The seismic wave modulus and the rutting permanent deformation show a quadratic polynomial relationship. The seismic wave modulus changes inversely with the temperature of the upper layer bottom layer. The relationship between seismic wave modulus and vertical and horizontal strain at the bottom of the surfacing layer is opposite, and the degree of change is quite similar.