埃塞俄比亚柔性路面典型结构优化设计与施工

Optimization of Flexible Pavement Structure Design and the Construction in Ethiopia

以埃塞俄比亚在建的某高速公路为依托,在分析埃塞俄比亚表选法柔性路面结构设计体系优缺点的基础上,结合中国的路面设计与施工经验,对表选路面结构进行了材料及结构组合设计优化,并采用Bisar 3.0等对优化结构进行力学分析,确定了高模量沥青碎石层的功能定位及分区;结合施工出现的问题,明确施工质量控制的关键点。结果表明：优化结构受剪层位于路表以下0-10 cm,高模量沥青碎石层底为弯拉峰区;基于力学分析提出柔性路面结构层功能定位,据此进行材料设计,并应充分考虑各层次模量的连贯性,提高柔性路面结构整体抗变形的协调性。

Depending on a highway project under construction in Ethiopia, the advantages and disadvantages of the design system for flexible pavement structure by means of chart selection were analyzed, based on which the material and structure combination design of the selected pavement structure was optimized with the experience on the pavement design and construction in China; and then in relation to the optimized structure, mechanical analysis was carried out by Bisar 3.0 so as to define the functional positioning and zoning at the high modulus asphalt macadam layer. In connection with the issues arising out of the construction, the key points controlling the construction quality were specified. The results show that the shearing layer of optimized structure locates 0 - 10 cm below the surface, and the bottom of high modulus asphalt macadam layer is of the peak area of flexural-tensile stress; the functional positioning of the structural pavement layers, which is proposed on the basis of the mechanical analysis, and the material design therewith, should consider the continuity of each layer＇s modulus fully to improve the coordination against deformation of the whole flexible pavement structure.