饱和沥青路面内孔隙水压力研究

Research on pore pressure within saturated asphalt pavement

基于多孔介质理论,假定沥青混合料为多孔介质,对于典型半刚性基层沥青路面结构建立了轴对称有限元模型;计算分析了动态荷载作用下路面结构在两种不同流体边界条件下的孔隙水压力分布规律,并建立了孔隙水压力与沥青面层、半刚性基层模量之间的关系.结果表明:由于流体边界条件的不同,沥青面层内孔隙水压力的分布规律不同;加铺排水基层有利于增强沥青路面的抗水损坏性能;沥青路面的材料刚度也是孔隙水压力值的重要影响因素.

Based on the porous media theory,assuming the asphalt concrete as saturated porous media material,the axisymmetric finite element model was established for the typical semi-rigid base asphalt pavement.Then the calculation and analysis of the pore pressure with two different boundaries of fluid were carried out and the relationships between the pore pressure and modulus of asphalt pavement which include the asphalt surface course and semi-rigid base were established.The result indicates that it is different for the pore pressure in the finite model with different boundaries.It＇s suggested that a drain layer should be set up to change the drainage condition from single-sided drain to two-sided drain,and thus the water-induced damage can be decelerated effectively.The stiffness of asphalt pavement is an important factor to the pore pressure.