水利水电科技进展2011，Vol.31Issue(4)：52-55,64,5.DOI:10.3880/j.issn.1006-7647.2011.04.012
雨洪水回灌过程中堵塞滤层特征试验
Characteristics of mechanicall clogging in rain-flood infiltration system
摘要
Abstract
The mechanical clogging process of aquifer under rain-flood infiltration was simulated by means of the laboratory tests on sand columns. The characteristics of mechanical clogging were analyzed by measuring the variations of permeability coefficient and infiltration rate of the clogging layer during the infiltration process. The test results show that 36 h after the infiltration, the permeability coefficient at the upper part (25-40 cm) of the sand column significantly decreases, from the initial 6.58 m/d to 3.72 m/d, and that at the middle and lower parts (40-70 cm) has small change, from the initial 6.45 m/d to 5.25 m/d. A comparison among the processes of infiltrated water with concentrations of suspended sediment of 50, 100, 200 and 400 mg/L indicates that the higher the concentration, the faster the decrease of the infiltration rate of silt layer. A comparison of the grain sizes of suspended sediment before and after infiltration shows that the grain size of suspended sediment ( surface muddy layer of the silt layer) appears fine phenomenon after infiltration. The muddy layer formed on the surface of the sand columns and the clogging at the upper part of the silt layer during the infiltration process are the main causes for the clogging failure of the whole aquifer.关键词
雨洪水回灌/物理堵塞/悬浮物质量浓度/渗滤速率Key words
rain-flood infiltration/mechanical clogging/suspended sediment concentration/infiltration rate分类
建筑与水利引用本文复制引用
童坤,束龙仓,黄修东,刘波,杨超..雨洪水回灌过程中堵塞滤层特征试验[J].水利水电科技进展,2011,31(4):52-55,64,5.基金项目
南京水利科学研究院基金(Y50801) （Y50801）
“十一五”国家科技支撑计划重点项目(2006BAB14B04) （2006BAB14B04）
