摘要
针对排水沥青路面服役期的空隙堵塞问题,采用室内堵塞试验模拟路面现场的堵塞过程,以渗水系数衰减率作为评价指标,分析了土样的撒布量、塑性指数对路面渗水系数衰减率的影响,同时比较了单、双层排水沥青路面的空隙堵塞程度。研究结果表明:土样的撒布量越大、塑性指数越高,排水沥青路面渗水系数的衰减率越大,当车辙板上土样撒布量超过1000g(单层排水路面)或1500g(双层排水路面),或者土样的塑性指数为11%时,排水沥青路面渗水系数的衰减幅度明显增大;双层排水沥青路面空隙堵塞后的渗水系数衰减率明显小于单层排水沥青路面,将1200mL/min作为排水沥青路面空隙堵塞周期的渗水系数阈值,前者的空隙堵塞周期较后者延长了1.5倍以上。
Aiming at the problem of void clogging in the service period of porous asphalt pavements,the clogging process of road sections is simulated by laboratory clogging test.The attenuation rate of permeability coefficient is taken as the evaluation index.The influence of soil sample amount and plasticity index on the attenuation rate of permeability coefficient is analyzed.Meanwhile,the degree of void clogging between single-layer and double-layer porous asphalt pavement are compared.The research results show that the larger the amount of soil sample and the higher the plasticity index,the greater the attenuation rate of permeability coefficient for porous asphalt pavements.Moreover,when the amount of soil sample is more than 1 000 g for single-layer porous asphalt pavements or 1 500 g for double-layer porous asphalt pavements,or the plasticity index of soil sample is 11%,the attenuation range of permeability coefficient increases obviously.The attenuation rate of permeability coefficient for double-layer porous asphalt pavement after clogging is obviously lower than that of single-layer porous asphalt pavements.With the permeability coefficient less than 1 200 mL/min as the limit value of void clogging,the clogging period of the former is more than 1.5 times longer than that of the latter.
作者
段宝东
李俊
李明亮
任万艳
武昊
DUAN Bao-dong;LI Jun;LI Ming-liang;REN Wan-yan;WU Hao(Jiangsu NingSuXu Expressway Co.Ltd.,Suqian 223800,China;Research Institute of Highway Ministry of Transport,Beijing 100088,China;Beijing University of Civil Engineering and Architecture,Beijing 102616,China)
出处
《公路》
北大核心
2021年第9期94-99,共6页
Highway
基金
交通运输行业重点科技项目清单,项目编号2019-TG-002
江苏省交通运输科技项目,项目编号2019Y04/2019Y35。
关键词
道路工程
排水沥青路面
空隙堵塞
渗水系数
室内堵塞试验
road engineering
porous asphalt pavement
void clogging
permeability coefficient
laboratory clogging test
