颗粒物对渗滤系统去除公路径流重金属的影响

Effect of Particulate Matter on Removal of Heavy Metals from Highway Runoff by Infiltration System

摘要:

研究旨在揭示高速公路地表径流颗粒对径流重金属过滤的影响，采用碎石-土壤渗滤柱处理南京绕城公路马群段路面径流，探究高速公路地表径流中重金属的渗滤去除特性、颗粒物截留特征，重点阐明不同粒径颗粒物截留与重金属渗滤去除的关系，同时探讨季节、pH值等环境因素对碎石-土壤渗滤去除径流重金属的影响。结果表明：沿碎石-土壤渗滤柱深度方向，Cu、Zn浓度呈非线性递减；装置上层35 cm厚度的土壤对大部分可去除的Cu、Zn有很好的截留作用。颗粒去除对径流中去除重金属的影响随着渗滤层填料厚度的增厚而提高。季节、pH值、氧化还原电位（ORP）及干期时间对重金属去除有不同程度的影响。

Abstract:

Taking an expressway embankment slope in a flood detention area in Tianjin as an example, Midas GTS finite element software is used to simulate and calculate the stability of embankment slope, and to calculate and analyze the water level changes of the embankment slope in the flood detention area one by one. The orthogonal design test method is used to analyze and compare the sensitivity of influences such as flood level drop range, water level drop speed and embankment filling permeability coefficient on embankment stability, which provides a useful reference for highway embankment projects in flood detention areas.