基于有限元分析的透水沥青路面结构优化方案

为深入分析降雨条件下透水沥青路面排水层内部渗流状况，更充分地发挥透水材料的渗透性能优势，对透水沥青路面的结构进行了优化。采用有限元软件SEEP/W，基于非饱和渗流理论分析了排水层在降雨过程中的内部渗流状况，针对影响排水层排水效率的结构性因素，提出了透水沥青路面的结构优化方案，并对该方案进行瞬态模拟。模拟结果表明，与常规方案相比，所提出的优化方案均在不增加排水层材料用量的情况下，大幅度提高了路面排水能力。其中，2%横坡路段，不等厚上面层模型和增设排水沟模型相较常规模型，在对降雨强度的适应能力方面分别提高了38.2%和158.8%；8%横坡路段，不等厚上面层模型和不等厚-增沟模型相较常规模型，在对降雨强度的适应能力方面分别提高了130.8%和234.6%。研究表明，对透水沥青路面结构进行的优化有效提高了其排水性能，增强了透水路面排水层对降雨的应对能力。

Improved Structural Design of Porous Asphalt Pavement Based on FEM

In order to analyze the interior seepage of the porous asphalt pavement drainage layer in precipitation process deeply, and take better advantage of the permeability of porous materials, the structure of porous asphalt pavement was improved. Based on unsaturated flow theory, the interior seepage of the porous asphalt pavement drainage layer in precipitation process was analyzed with the FEM(Finite Element Model) software SEEP/W. Several improved structure design schemes were raised considering the structural factors that influence the drainage efficiency. The transient simulations of improved structure design schemes were conducted. The analysis result showed that these improved designs increased the drainage ability significantly without increasing the usage of porous material comparing with conventional schemes. With 2% cross slope, the drainage capacity of unequal thickness model and adding drainage ditch model were increased by 38.2% and 158.8% respectively. With 8% cross slope, the drainage capacity of unequal thickness model and unequal thickness-adding drainage ditch model were increased by 130.8% and 234.6% respectively. It is proved that these improved designs enhance the drainage capacity of porous pavement and the disposition effect to rainfall.