路面下层结构自由水是加速路面损坏重要原因.以平原微丘高速公路为工程实例,设计了公路排水系统并模拟了降雨情况下公路面层、基层结构内部含水量,通过有限元计算得出以下几点结论:在降雨期间t=800 s时面层体积含水量为8.1%,达到饱和状态,随着时间增长雨水逐步下渗,降雨后约6 h排水基层体积含水量达到峰值为10.9%,在排水系统有效运行下雨停后一个月可排出50%自由水;对带裂缝公路进行渗水量模拟并与无裂缝公路对比分析可知二者路面排水基层含水量相差5%,说明裂缝导致雨水渗入量增大不少,易加速路面损坏.%The free water of pavement structure is an important reason to accelerate pavement damage.On the highway to plain with micro hill as an example,the design of highway drainage system and simulated rainfall conditions of road surface and base structure of internal moisture,through the finite element calculation results are as follows:during the period of rainfall t=800s surface volume water content is 8.1%,saturated with the time increase gradually,rainwater infiltration after the rain,6h basic volume water content reached a peak of 10.7% in the drainage system,the effective operation of the rain stopped after a month can be discharged 50% free water;with crack on Road water seepage simulation and comparative analysis of the two pavement moisture difference of 5% cracks in highway,the crack causes rain infiltration increased a lot.To speed up the pavement damage.
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