非饱和粘性土电阻率结构模型研究  

Study on the Electrical Resistivity Characterization of Unsaturated Clay

作　　者：查甫生[1] 刘松玉[1] 杜延军[1] 

机构地区：[1]东南大学岩土工程研究所,南京210096

出　　处：《工程勘察》2006年第7期1-4,42,共5页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金资助项目(No.50478073)

摘　　要：粘性土是通过孔隙水、粘粒周围的双电层以及粘土矿物来导电的。本文在讨论粘性土导电特性的基础上,假定非饱和粘性土中存在三种电流流通路径,针对已有的非饱和土电阻率结构模型存在的缺陷,推导出非饱和土的电阻率模型,并根据Archie(1942)定义的土的电阻率结构因子的概念,给出了非饱和土的电阻率表观结构因子的表达式。文章最后总结归纳了影响非饱和土电阻率的主要的三大类因素。Electric current flows through clayey soils by the conduction of void water, electric double layer and clay minerals. The electrical characterization of clay is discussed at first in this paper. Based on the hypothesis that there are three conductance pathways in unsaturated clay, aims at the deficiency of the existing models of unsaturated clay, the electrical resistivity model of unsaturated clay is studied. Based on the definition of soil electrical resistivity formation factor by Archie （ 1942）, the apparent electrical resistivity formation factor of unsaturated clay is given in the paper. At the end, the factors affecting the electrical resistivity of soil were summarized and analyzed.

关 键 词：非饱和粘性土 导电性 电阻率 表观结构因子 

分 类 号：TU411[建筑科学—岩土工程]