摘要
采用不同方法对西辽河通辽段河床沉积物渗透系数进行现场测定,获取各点位的垂向渗透系数。并分别在探坑、土样坑、渗透仪渗水试验、竖管试验、渗坑法渗水试验、双环渗水试验位置处及其附近,先从河底表面取沉积物样,再从岩性明显变化的不同深度取样,带回实验室,进行颗粒分析,探讨河床沉积物渗透系数与颗粒级配之间的关系。结果表明:随着河床沉积物中砂石含量的增加其渗透系数也增大;反之,河床沉积物中黏土含量增加其渗透系数减小。沉积物的颗粒级配是影响渗透系数的重要因素,颗粒级配对于沉积物的孔隙尺寸、孔隙的形状及大小都有很大的影响。研究结果可为计算地表水与地下水的交换量提供可靠的水文地质参数,进而提高地下水资源评价结果的精度。
The permeability coefficients of riverbed sediments in the Tongliao section of the Xiliao River were measured in situ using different methods to obtain the vertical permeability coefficients at each point.Sediment samples were also taken from the surface of the river bottom at and near the locations of the exploratory pits,soil sample pits,permeameter seepage test,vertical pipe test,seepage pit method seepage test,and double-ring seepage test,and then from different depths where the lithology had changed significantly,and then brought back to the laboratory and analyzed in the laboratory for particle analyses,in order to explore the relationship between the coefficient of permeability of the riverbed sediments and the particle gradation.The results show:The permeability coefficient increases as the sand and gravel content of the riverbed sediments increases;conversely,the permeability coefficient decreases as the clay content of the riverbed sediments increases.The particle gradation of sediments is an important factor affecting the permeability coefficient,and the particle gradation has a great influence on the pore size,shape and size of the pores in the sediments.The results of the study can provide reliable hydro-geological parameters for calculating the exchange between surface water and groundwater,and thus improve the accuracy of the results of groundwater resources evaluation.
作者
刘笑宇
澈丽木格
张彤豪
周天雨
刘圣昱
LIU Xiao-yu;CHE LI Mu-ge;ZHANG Tong-hao;ZHOU Tian-yu;LIU Sheng-yu(Water Conservancy and Civil Engineering College,Inner Mongolia Agricultural University,Hohhot 010018,China;Tongliao Water Conservancy Development Center,Tongliao 028000,China;College of Hydrology and Water Resources/The National Laboratory of Water Disaster Prevention,Hohai University,Nanjing 210098,China)
出处
《地下水》
2024年第4期61-62,96,共3页
Ground water
基金
国家重点研发计划项目(2021YFC3200502)。
关键词
渗透仪渗水试验
竖管试验
渗坑法渗水试验
双环渗水试验
渗透系数
河床沉积物
西辽河通辽段
颗粒分析
penetrometer water penetration test
vertical tube test
seepage test by pit method
double ring percolation test
permeability coefficient
riverbed sediment
Tongliao section of West Liao River
particle analysis
