不可动水对土壤污染物运移影响的数值实验研究  

The Numerical Experimental Study on the Effect of Immobile Water on Contaminant Transportation in Soil

作　　者：赵颖[1] 梁冰[2] 薛强[1] 王永波[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]辽宁工程技术大学力学与工程科学系,辽宁阜新123000

出　　处：《应用基础与工程科学学报》2007年第4期496-500,共5页Journal of Basic Science and Engineering

基　　金：岩土力学与工程国家重点实验室开放基金(0710031Z01);国家自然科学基金资助项目(5037404150574048);湖北省自然科学基金计划青年杰出人才项目(2006ABB007);地质灾害防治与地质环境保护国家重点实验室资助项目(GZ2006-03)

摘　　要：考虑对流、弥散、吸附/解析、微生物降解等因素,建立了土壤中污染物运移的两区平衡吸附动力学模型.在该模型基础上,针对不可动水对污染物运移的影响进行了分析.分析结果表明:即使在孔隙水流速、含水率及其它参数相同的情况下,不同的iθm/mθ值也会导致不同的穿透曲线;不可动水所占的比例较大时,即使保证了孔隙流速、输入浓度、弥散系数等参数相同,不同的含水率也会导致不同的穿透曲线,但iθm/θm较小时,含水率的变化对浓度的变化几乎无影响.The two-region model for contaminant transport in soil has been established considering the convection, diffusion, equilibrium absorption-desorption and microbiological degradation. On the basis of the model, the effect of the immobile water on contaminants transport in soil was analyzed. The results showed that in spite of the same values of pore water velocity, water content and other parameters, the different value of θim/θm may cause the different breakthrough curves; when the proportion of immobile water was higher, in spite of the same values of pore water velocity, input concentration and dispersion coefficient etc, the different values of water content may cause the different breakthrough curves, but when the value of θim/θm was very small, the differences of water content almost had no effect on the concentration.

关 键 词：污染物运移 两区模型 数值实验 不可动水 

分 类 号：TU433[建筑科学—岩土工程]