不同影响因素下石油污染土电阻率特征研究

The study on resistivity characteristics of oil contaminated soil in different influencing factors

通过室内配制标准样品的方式,利用Miller Soil Box法研究了土壤类型及组成、石油种类、含水饱和度、含油饱和度和孔隙率对石油污染土电阻率的影响,并利用灰色关联度法确定了电性变化主控因素,探讨了石油污染土电阻率公式.结果显示,不同土壤类型及组成的石油污染土电阻率大小存在差异,但影响因素主次顺序均为含水饱和度、含油饱和度、孔隙率;不同石油种类污染土电阻率差异较小;电阻率受土壤初始含水率影响较大,不同初始含水率状态下电阻率变化规律不同.通过引入含油饱和度改进Archie型公式,重新拟合石油污染土电阻率和污染物含量数据后发现,计算值和实测值的变化趋势更接近.

The impact of soil types and components,oil types,water saturation,oil saturation and porosity on the resistivity of oil contaminated soil was studied by Miller Soil Box through preparing standardized samples in laboratory. The main controlling factors of resistivity variation characteristics were determined by Grey Correlation Analysis. The resistivity formulas of oil contaminated soil were also explored. The results indicated that the oil contaminated soil resistivity of different soil types and components had discrepancy in values,but the sequence of influencing factors of resistivity was all water saturation,oil saturation and porosity. There was small difference in contaminated soil resistivity between different types of oil. The initial soil water content had great effect on resistivity,and resistivity change rules were diverse under different initial water content conditions. The Archie formula was developed by introducing oil saturation,and the calculated and measured value trends were closer after the relationship of the resistivity and oil content were refitted.