甲基叔丁基醚污染黏土的Archie电阻率模型修正方法  

Correction method of Archie resistivity model for methyl tert-butyl ether contaminated clay

作　　者：祁妍敏 汪淼 章定文[1] 林文丽 QI Yan-min;WANG Miao;ZHANG Ding-wen;LIN Wen-li(School of Transportation,Southeast University,Nanjing,Jiangsu 211189,China;China Road and Bridge Corporation,Beijing 100010,China)

机构地区：[1]东南大学交通学院,江苏南京211189 [2]中国路桥工程有限责任公司,北京100010

出　　处：《岩土力学》2023年第6期1719-1728,共10页Rock and Soil Mechanics

基　　金：国家重点研发计划项目(No.2020YFC1808101)。

摘　　要：通过引入污染物影响系数及修正孔隙率,提出了一种挥发性有机物污染黏土的Archie电阻率修正模型,并通过米勒土盒单元试验结果给出了模型中的4个参数(胶结指数、饱和度指数、污染物影响系数和孔隙微观分布不均匀性系数)的确定方法。结果表明,黏土的地层因子与孔隙率呈正相关关系,与砂土的相应关系相反,这是黏土颗粒表面电荷对电阻率的影响所致。饱和度指数随体积含湿率的增加呈抛物线变化,随孔隙率的增加呈线性增加,据此提出了同时考虑两种因素的饱和度指数经验公式。综合土体电阻率与体积含水率之间的幂函数关系及与体积含污率之间的线性关系,得到了污染物影响系数的确定方法。孔隙微观分布不均匀性系数a随体积含水率的变化可分为陡降、趋平和缓升3个阶段,土中孔隙水的赋存状态是主要影响因素。An Archie resistivity correction model for volatile organic compound(VOC)contaminated clay was proposed by introducing the contaminant influence coefficient and correcting the porosity.Determination method of the four parameters(cementation exponent,saturation exponent,contaminant influence coefficient and coefficient of uniformity for pore micro-distribution)in the model was proposed based on the results of the Miller soil box test.The test results show that the formation factor of clay is positively correlated with porosity,which is different from the sandy soils,due to the effect of surface charge of clay particles on resistivity.The saturation exponent varies parabolically with the increase of volumetric moisture content and it increases linearly with the increase of porosity,whereby an empirical formula of saturation exponent considering both factors is proposed.The power function relationship between soil resistivity and volumetric water content and the linear relationship between soil resistivity and volumetric contaminant content were integrated to obtain the determination method of contaminant influence coefficient.The variation of coefficient of uniformity for pore micro-distribution with volumetric water content can be divided into three stages:steeply falling stage,leveling stage and slowly rising stage,and the occurrence state of pore water in soil is the main factor affecting a.

关 键 词：甲基叔丁基醚(MTBE)污染黏土 电阻率修正模型 胶结指数 饱和度指数 污染物影响系数 孔隙微观分布不均匀性系数 

分 类 号：TU442[建筑科学—岩土工程]