渗排型透水铺装下渗出流控制效能场地试验研究

Field Test of Bottom Outflow Control Efficiency in Permeable Pavement with Underdrainage

实地搭建了5种面层结构不同的渗排型透水铺装,监测了每种透水铺装在2个雨前干期和7个降雨重现期下模拟降雨的下渗出流,并从有效滞留量的角度分析和量化了透水铺装面层结构、雨前干期、降雨重现期对透水铺装下渗出流控制效能的影响。与透水铺装范围内的降雨相比,在降雨强度为18.0~241.8 mm/h、雨前干燥期为0~2 d条件下,渗透率≥0.57 mm/s的透水铺装的下渗出流体积削减率、峰值削减率、峰值延时的范围分别为22%~100%、41%~100%、6~44 min。在5种透水铺装中,透水混凝土铺装的下渗出流控制效能最佳。下渗出流控制效能与降雨重现期呈负相关,而与雨前干期呈正相关,下渗出流控制效能随降雨重现期的增加先明显降低而后趋于稳定。

Five permeable pavements with different surface structures were built on the spot,the bottom outflow was monitored under rainfall events with two antecedent dry periods and seven rainfall return periods,and the effects of surface structure,antecedent dry period and rainfall return period on bottom outflow control efficiency were analyzed and quantified from the perspective of effective retention volume.Compared with the rainfall within the permeable pavement area,the bottom outflow volume reduction rate,peak reduction rate and peak delay of the permeable pavement with infiltration rate of more than 0.57 mm/s were in the range of 22%-100%,41%-100%and 6-44 min respectively under the rainfall intensity of 18.0-241.8 mm/h and antecedent drying period of 0-2 days.Among the five kinds of permeable pavement,pervious concrete pavement had the best control efficiency of bottom outflow.The control efficiency of bottom outflow was negatively correlated with the rainfall return period,but positively correlated with the antecedent dry period.The control efficiency of bottom outflow decreased obviously first and then tended to be stable with the increase of rainfall return period.