Structure of the internal drainage of the current drainage of the road is often only focus on the road surface within the road surface of the water exclusion, the pavement structure within the drainage is very important.
Water can penetrate the pavement structure through pavement infiltration, surface osmotic water, groundwater, spring water, frozen melted water, capillary water and so on, which directly reduces the strength of pavement material and the loss of indirect roadbed support. Therefore, the internal drainage of the structure of the asphalt pavement use performance improvement is significant.
China "asphalt pavement design specifications J T GD50-2006" based on theoretical design of the road, the structure of the internal drainage conditions are not reflected in the road thickness design. Wang Shengjun and Wei Huan-fen pointed out that China's high-grade highways generally use semi-rigid grassroots, pavement design generally do not consider the pavement structure of the internal drainage, the general design of the embedded curb, masonry shoulder, pulp retaining wall, which are hampered by A variety of ways to invade the internal structure of the water discharge, it is recommended to set the blind ditch to ensure that the water inside the road can be excluded from the road.
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