摘要
基于竖管法测定沉积物渗透系数的原理,设计一种以空气作为流体测定沉积物渗透率的试验方法—气动试验法,将沉积物的空气渗透率(k_a)转换成用水当做流体时测定的渗透系数(K_w)。利用气动试验法和竖管法分别测定3组沙漠砂样和7组河漫滩砂样的渗透系数。试验结果表明,气动试验法测定沉积物的渗透系数可行,与竖管法相比更加方便、快捷,可以解决竖管法耗水、耗时的局限性,可应用于干旱-半干旱地区野外沉积物渗透系数的测定。
On the basis of the standpipe method that measures the hydraulic conductivity of a sediment column,a device for air permeability test was designed and assembled,which used air as the fluid to determine the air permeability of a sediment column. The air permeability of a sample can then be converted to the hydraulic conductivity. In this study,the authors use air permeability test and standpipe method to measure hydraulic conductivity of three eolian（ from desert） sediment samples and seven floodplain sediment samples. Test results indicate that air permeability test is a feasible method to measure hydraulic conductivity of sediment. Compared with the standpipe method,the air permeability test can be conducted in a short time and requires no water. Thus estimating hydraulic conductivity of sediments by the air permeability test is a valuable choice for test sites lack of water.
出处
《世界地质》
CAS
2016年第2期575-579,共5页
World Geology
基金
国家自然科学基金(41072183)
国家"973"项目(2014CB7444702)联合资助
关键词
沙漠砂样
气动试验法
竖管法
渗透系数
eolian sand
air permeability test
standpipe method
hydraulic conductivity
