考虑车速的车辙预估模型研究

Study on Rutting Prediction Model Considering Vehicle Speed

摘要:

以海南地区常用的3种路面材料SMA，Superpave和AC类沥青混凝土为研究对象，选用小型加速加载仪进行了不同行驶速度下不同铺面材料的永久变形试验，得出了新的车辙预估模型，并与现有的环道试验数据进行对比。研究发现：车辙预估模型必须充分考虑车速的影响，在用来回归模型系数的原始试验数据中，必须加入足够多的车速数据；对于不同的铺面材料，采用修正后的预估模型进行拟合后，预测值与现场实测值的相关系数R2可分别达到0.947、0.937和0.928，新模型的预估精度大大高于之前未充分考虑车速的模型。

Abstract:

Taking three kinds of pavement materials of SMA, Superpave and AC asphalt concretes commonly used in the areas of Hainan as the object, small accelerating loader is selected to carry out the permanent deformation tests of the different paving materials under the different driving speeds. A new rutting prediction model is obtained. The comparison is carried out with the existing ring road test data. It is found that the influence of vehicle speed must be fully considered in the rutting prediction model. The sufficient vehicle speed data must be added in the original test data used for the regression of the model coefficients. For the different paving materials, after fitting with the revised prediction model, the correlation coefficient R2 between the predicted value and the field measured value can reach 0.947, 0.937and 0.928, respectively. The prediction accuracy of the new model is much higher than that of the previous models not fully considering the vehicle speed.