柴油污染粉质黏土的电阻率特性及影响因素

Electrical Resistivity Characteristic and Influence Factors of Diesel Contaminated Silty Clay

以南京地区典型的粉质黏土为研究对象,人工配制了不同含水率、不同含油率的柴油污染土,采用Miller Soil Box对不同状态的污染土体电阻率进行了测试,建立了土体电阻率与含水率、含油率和饱和度间的相关关系.结果显示,含油率相同时,电阻率随含水率、饱和度的增大呈幂函数关系减小;含水率相同时,电阻率随含油率的增大而线性增加.引入体积含湿率来分析油水共同作用对电阻率的影响,发现饱和度相同时,电阻率随体积含湿率的增加而线性增大.采用正交分析法对电阻率的三种影响因素进行主次分析,影响大小为饱和度>含水率>含油率.

Silty clay from Nanjing city was used as parent soil for preparing diesel-contaminated soils with various moisture content and diesel content.The soil resistivity of diesel-contaminated soils was then determined by a Miller Soil Box to estimate the variation of the resistivity with moisture content, diesel content and saturation degree.Results indicate that soil resistivity increases with decreased moisture content and saturation degree for a given diesel content, which can be expressed using a series of power functions.The soil resistivity increases linearly with increased diesel content for a given moisture content.A new characteristic parameter, volume moisture content, is developed to better understand the influence of water-diesel interaction on the soil resistivity.It is found that the soil resistivity increases linearly with an increase in the volume moisture content for a given saturation.Orthogonal analysis was performed to rank the importance of influence factors on the soil resistivity, indicating the following order： degree of saturation 〉 water content 〉 oil content.