沥青路面加铺结构中土工布夹层黏结失效时温特性

针对含土工布夹层的双层沥青混合料试件进行直剪试验，以层间抗剪强度为指标，通过方差分析和多重比较分析了温度和加载速率对土工布夹层黏结失效的影响作用，建立了含土工布夹层试件的层间抗剪强度与温度、加载速率的数学关系，基于时间-温度等效原理确定了层间抗剪强度sigmodial主曲线，并对其时温等效特性进行了验证.结果表明：含土工布夹层试件层间抗剪强度受温度和加载速率显著影响，随温度升高或加载速率下降其值逐渐降低；指数模型对层间抗剪强度拟合效果良好，模型预估值与试验测试值基本吻合.sigmodial主曲线在更宽加载速率范围内表征了层间抗剪强度的变化趋势，黏层油蠕变柔量与层间抗剪强度两力学参量的移位因子一致性验证了土工布夹层黏结失效具有时温等效特性.
Layer-parallel direct shear test was carried out on the double-layered asphalt concrete specimens with geotextile interlayer. The influence significances of temperature and deformation rate on the bond failure behavior of geotextile interlayer in asphalt overlay were analyzed by using the index of interlayer shear strength based on ANOVA and multiple comparing methods. The mathematical relationship among temperature，deformation rate and interlayer shear strength was then derived from an exponential function. Moreover，the sigmoidal master curve of interlayer shear strength was built based on the time-temperature superposition principle (TTSP) and the equivalent character of time-temperature for interlayer shear strength was also validated. The results showed that the influences of temperature and deformation rate were significant. The interlayer shear strength was lower when the temperature increases or deformation rate decreases. Furthermore，exponential model was used to predict the interlayer shear strength in laboratory，and the simulation results agreed well with the experimental results. The change tendency of the interlayer shear strength was showed in a broader range of deformation rate by using the sigmoidal master curve. The interlayer shear strength of specimen with geotextile interlayer had equivalent character of time-temperature which was validated by the consistency of shift factors for creep compliance and interlayer shear strength.