含水介质中渗透性突变的机理研究  

Water-bearing medium permeability of the mutation mechanism

作　　者：雷锋斌[1] 李国霞[2] 韩志勇[2] 

机构地区：[1]中北大学化工与环境学院,太原030051 [2]兰州理工大学石油化工学院,兰州730050

出　　处：《工程勘察》2009年第5期31-34,39,共5页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金资助项目(40572142)

摘　　要：通过盐度突变砂柱试验，对大沽河海咸水入侵区砂质含水层的渗透性突变进行了初步研究，并且探讨了咸淡水相互作用过程中渗透性降低的主要机制及对引起渗透性降低的主要影响因素进行分析。试验结果表明：盐浓度的突然降低会直接导致含水层渗透性发生急剧下降，同时在流出液中出现大量以粘土矿物为主的微粒物质；粘土矿物的含量和种类对含水介质渗透性降低幅度的影响非常大，盐度突变过程中，反应性粘土矿物对砂柱渗透性的影响要远远大于非反应性的微粒，且重量比为3％～4％时便可使砂柱的渗透系数降低到零。Through the test about mutation sand columns, a preliminary study about the mutation of sandy aquifer permeability in Dagu invasion of sea water area has been carried out, which explores the interaction between salt and fresh water permeability in the process of reducing the main cause of the mechanism and analysizes the main affective factors that reduce the permeability. The results show that the salt concentration will suddenly reduce the permeability of the aquifer as a direct result of drastic decrease in outflow of fluid in a large number of clay minerals mainly particulate matter; that the clay mineral content and types of water-bearing medium permeability to reduce the impact of very large margin, the salinity in the process of mutation and the reaction of clay minerals on the permeability of the sand column are much greater than the impact of non-reactive particles, and that a 3 % to 4 % weight ratio would allow the permeability of the sand column down to zero.

关 键 词：含水介质 渗透性 粘土矿物 

分 类 号：X523[环境科学与工程—环境工程]