高速公路超高缓和段排水沥青路面空隙率及内部排水设计方法
Design Method for Air Void and Internal Drainage of Porous Asphalt Pavement at Highway Superelevation Transition Section

高速公路超高缓和段由于纵横坡度较小，极易造成路面积水。为解决超高缓和段路面积水问题，依托青临高速公路某超高缓和段路面工程，提出了排水沥青路面设计方案。首先结合工程案例，给出了无路面积水和水膜厚度小于临界水膜厚度两种工况下的空隙率计算方法。然后，提出了一种匹配排水沥青路面内部排水的横向排水槽结构，给出了横向排水槽尺寸与数量的确定方法。案例计算结果表明，本文给出的排水路面目标空隙率及内部排水设施设计方法是可行与合理的，可为解决高速公路超高缓和段路面积水难题提供参考。
The superelevation transition section of the highway is highly susceptible to water on the roadway due to the low longitudinal and transverse slopes. In order to solve the problem of water on the road surface of the superelevation transition section, the design of porous asphalt pavement was proposed based on a pavement project of a superelevation transition section of Qinglin Expressway. Firstly, the calculation method of air void under two working conditions of no road surface water and water film thickness less than critical water film thickness is given with engineering cases. Then, a transverse drainage channel structure matching the internal drainage of the porous asphalt pavement is proposed, and a method for determining the size and number of transverse drainage channels is given. The results of the case calculations show that the target air void of porous asphalt pavement and the design method of internal drainage facilities given in this paper are feasible and reasonable, which can provide a reference for solving the problem of water on the road surface of the superelevation transition section of highway.