合流制管道沉积物冲刷模拟试验研究  

Laboratory‑scale Study on Scouring of Sediment in Combined Sewer System

作　　者：罗晓萍 姜应和[1,2] 程静 车伍[3] 赵杨 杨正 LUO Xiao‑ping;JIANG Ying‑he;CHENG Jing;CHE Wu;ZHAO Yang;YANG Zheng(School of Civil Engineering&Architecture,Wuhan University of Technology,Wuhan 430070,China;Department of Urban Construction Engineering,Wenhua College,Wuhan 430074,China;Beijing Yuren Rain‑eco Technology Co.Ltd.,Beijing 100044,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070 [2]文华学院城市建设工程学部,湖北武汉430074 [3]北京雨人润科生态技术有限责任公司,北京100044

出　　处：《中国给水排水》2023年第11期132-138,共7页China Water & Wastewater

基　　金：武汉市水务局科技计划项目(201802);中央高校基本科研业务费专项资金资助项目(185206009)。

摘　　要：为了探究合流制管道沉积物雨天的冲刷效果,以合流制管道沉积物为试验材料,将冲刷流量Q、管道坡度i和沉积厚度占管径的比例h_(y)/D作为主要参数,进行了冲刷模拟试验。单因素试验结果表明,在不同因素条件下,冲刷出水SS浓度均随冲刷时间呈现指数衰减变化趋势,冲刷主要集中在前60 s内;随着Q、i和h_(y)/D的增大,冲刷出水SS平均浓度递增;冲刷释放的SS量随Q的增大而增加。冲刷初期优先对表面的小颗粒进行冲刷,在较大的Q和i条件下,中值粒径峰值出现较早,粒径变化趋势不大;而当h_(y)/D较大时,中值粒径峰值出现较晚,粒径变化趋势较缓。正交试验结果表明,对于SS冲刷量,因素影响权重顺序为:Q>h_(y)/D>i。To explore the scouring of the sediment in the combined sewer system in rainy days,scouring experiments were carried out by using scouring flow(Q),the slope of the pipeline(i)and the ratio of sediment thickness to pipe diameter(h_(y)/D)as the main parameters.The single factor experiments showed that under conditions of different factors,the SS concentration in effluent showed an exponential decaying trend with scouring time,and the scouring was mainly occurred in the first 60 seconds.The average SS concentration in effluent increased with the increase of Q,i and h_(y)/D.The SS released by the scouring increased with the increase of Q.The small particles on the surface were scoured preferentially at the initial stage of scouring.Under large Q and i conditions,the peak value of the median particle size appeared earlier,and the variable trend of particle size was not significant.When h_(y)/D was larger,the peak value of the median particle size appeared later,and the variable trend of particle size was slower.The orthogonal experiments showed that the weight of factors affecting SS scouring in descending order was Q,h_(y)/D and i.

关 键 词：合流制管道 沉积物 冲刷 颗粒粒径 影响因素 

分 类 号：TU992[建筑科学—市政工程]