雨水径流条件对陶瓷透水砖快速堵塞的影响

利用自行研制的透水砖雨水径流快速堵塞模拟装置,分别研究了雨水径流中颗粒浓度、颗粒粒径和径流速度对陶瓷透水砖渗透系数的影响。试验结果表明:在雨水径流颗粒粒径为10~150μm的条件下,堵塞过程主要经历快速堵塞、局部波动和渐进堵塞三个阶段。雨水径流中的颗粒浓度和粒径分布是影响陶瓷透水砖快速堵塞的主要因素。在颗粒浓度为200~1000 mg/L的条件下,随着颗粒浓度的增大,透水砖堵塞过程延缓、程度变轻;随着颗粒粒径的增大,堵塞特性相反。雨水径流流速是影响陶瓷透水砖快速堵塞的次要因素。当径流流速从1.5 cm/s增加到6.5cm/s时,堵塞过程变慢,但不显著影响最终堵塞的程度。应结合当地雨水径流颗粒粒径范围,选用合适规格的陶瓷透水砖。

Effect of Stormwater Runoff Conditions on Rapid Clogging of Ceramic Permeable Brick

Effects of sediment concentration,sediment diameter and runoff velocity on rapid clogging of ceramic permeable brick were explored by using a self-developed experimental device for simulating the rapid clogging of ceramic permeable brick by stormwater runoff.When sediment diameter in stormwater was between 10μm and 150μm,the clogging process mainly included three stages:rapid clogging,local fluctuation and gradual clogging.The sediment concentration and particle size distribution in stormwater runoff were the main factors affecting the rapid clogging of ceramic permeable brick.When sediment concentration was between 200 mg/L and 1000 mg/L,the clogging process was slowed down and the clogging was less severe with the increase of sediment concentration.However,opposite clogging characteristics were obtained with the increase of sediment diameter.Stormwater runoff velocity was the minor factor influencing the rapid clogging of ceramic permeable brick.When the runoff velocity was increased from 1.5 cm/s to 6.5 cm/s,the clogging process became slow,but the final clogging degree was not significantly influenced.Ceramic permeable brick with proper specifications should be selected and applied according to the sediment diameters in the local stormwater runoff.