基于多层弯沉盆法的沥青路面结构层模量反演

Back calculation of structural modulus of asphalt pavement based on the method of multi-layer deflection basin

路面结构层模量是确定路面结构损伤状态的重要指标,决定着道路养护决策的科学性,而路面结构层模量反演是确定此指标的有效方法,也是路面结构性能评价中最关键的技术之一。文章利用沥青路面各结构层实测的弯沉盆数据,基于多层弯沉盆法对路面各结构层的弹性模量进行了反演分析。结果表明:多层弯沉盆法与传统方法的模量反演结果相比,沥青层和路基模量反演结果较为接近,而半刚性基层(上基层、下基层、底基层)结果差别较大;从底基层顶面到沥青层顶面,路基反演回弹模量修正系数逐渐减小,而路基弹性模量随检测层位的增高即压应力的减小而增大。

The structural modulus is an important factor to determine the damage stage of asphalt pavement. Modulus back calculation is one of the most efficient key techniques to ascertain this parameter. The modulus of all the layers of pavement and subgrade at different stress condition are back calculated based on multi-layer deflection basins which are measured layer by layer at the same plane coordinates of the top of different structure layers. The result implies that compare the back calculated modulus method with traditional method, the back calculation modulus of asphalt layer and subgrade are similar, while difference of the semi-rigid base results are large. The correction coefficient for back calculated modulus of subgrade decrease when the deflection basin is tested from the subbase layer tothe top layer . The modulus of subgrade whose back calculated modulus increases when the deflection basin is measured on the upper layer, is stress dependent.