颗粒物粒径和维护方式对透水砖铺装透水率衰减过程影响

Impacts of Particle Size and Maintenance on Clogging Processes of Permeable Pavement Systems

透水铺装堵塞过程造成的渗透性能衰减严重影响其调控径流、净化水质和补给地下水等功能。该研究基于透水砖铺装渗透模拟实验,监测不同颗粒物粒径范围(0~200μm、0~600μm、0~1000μm)和清理维护方式(不清理、真空抽吸尘、压力水冲洗)下透水砖铺装系统及各结构层透水率衰减过程,定量分析颗粒物粒径范围、清理维护方式对透水砖铺装系统、砖层和找平层透水率衰减过程的影响。结果表明:透水砖铺装系统渗透率呈显著指数衰减趋势,衰减过程随颗粒物粒径范围增大而加速,3种颗粒物粒径范围下的透水率(>27.3 mm/h)有效运行年限分别为20、19、7 a;0~200μm范围颗粒物对找平层透水率衰减的影响最大,实验后找平层上层细颗粒物(0~200μm)含量增加0.5%~54.3%,是造成透水砖系统透水率衰减的主要原因;真空抽吸尘对透水砖铺装的清理维护效果优于压力水冲洗,这2种维护方式下实验后的砖层平均渗透率相差1171 mm/h。以上研究结果可为认识透水砖铺装系统渗透性能衰减规律和科学更新维护透水砖铺装提供参考。

Attenuation of permeability of permeable pavement systems caused by the clogging processes seriously influences their stormwater control,water quality control and ground water discharge functions.In the study,a permeable pavement infiltration experiment is conducted to quantify the impacts of ranges of particle size and maintenance methods on the clogging processes of permeable pavement systems,permeable pavers and bedding aggregate layers.Three different particle size ranges(0~200μm,0~600μm,0~1000μm)and three maintenance methods(non-cleaned,vacuum suction and high pressure washing)are included in the experiment.The results show that the permeability of the permeable pavement systems decayed exponentially,and clogging process of permeable pavement systems accelerates with the increase of particle size.The effective life of water permeability(>27.3 mm/h)of the three particle sizes was 20 years,19 years and 7 years,respectively.Particles in the range of 0~200μm had the greatest influence on the clogging of the bedding layers.After the experiment,the content of fine particles(0~200μm)in the upper layers of the bedding layers increased by 0.5%~54.3%,which was the main cause of the clogging of the permeable pavement system.The effect of vacuum suction on permeable pavement is better than that of pressure water flushing.The average permeability difference of permeable pavers after the two maintenance methods is 1171 mm/h.The results of the experiment would provide scientific references for study of clogging processes of permeable pavement systems and suitable maintenance methods.