下封层连接状况对沥青路面疲劳寿命的影响

Influence of the Lower Seal Coat Connection Effect on Fatigue Life of Asphalt Pavement

目的研究橡胶沥青碎石封层、乳化沥青碎石封层、稀浆封层和热沥青碎石封层的层间连接状况对路面疲劳寿命的影响.方法通过室内剪切试验测得不同下封层的连接状况;并依据试验结果,采用多层弹性体系理论方法,计算当基面层间应用不同下封层时无机结合料稳定层的层底拉应力和疲劳开裂寿命;最后,在辽宁省范围内,选取典型路线对下封层的应用状况进行实地调研和后评估.结果室内试验和理论分析表明下封层的连接状况越好,沥青路面的疲劳寿命越大;现场调研与室内试验、理论分析结果基本一致.结论当基面层间应用下封层技术时,四种下封层技术的层间连接效果依次减弱,对应路面的疲劳寿命依次减小.

The paper is to study the effect of interlaminar joint condition of rubber asphalt gravel seal,emulsified asphalt gravel seal,slurry seal and hot asphalt gravel seal on pavement fatigue life. It makes use of indoor shear test to measure the connection condition of different lower seal layers. According to the test results,the multi-layer elastic system theory method is used to calculate the layer bottom tensile stress and fatigue cracking life of subbase when different lower seal layers are applied between the base and the surface layer. Finally,within the scope of Liaoning Province,the typical route was selected to conduct on-the-spot investigation and post-evaluation of the application effect of the lower seal layer. The indoor test and theoretical analysis show that the better the connection condition of the lower seal layer,the greater the fatigue life of the asphalt pavement. The field investigation is basically consistent with the results of laboratory tests and theoretical analysis. When the lower seal coat technology is applied between the base and surface layer,the interlayer connection effect of the above four lower seal layer technologies is weakened in turn,The fatigue life of the corresponding asphalt pavement is reduced sequentially.