摘要
为了研究重金属污染土的热传导特征,在室内分别拌制了黏土、粉质黏土的不同重金属污染成分(Pb,Zn)、不同污染浓度N、不同含水率ω和干密度ρ_d的重金属污染土试样,采用非稳态热探针法对不同状态下的污染土体热导率进行了测试.试验结果显示,4种重金属污染土有相似的变化规律,即在相同的含水率下,热导率随污染浓度的增加而线性增大;在相同的污染浓度下,热导率随含水率的增加而呈指数关系增大,随干密度的增加而线性增大,与未污染土的表现特点相似.通过分析污染土归一化热导率与污染浓度的关系,建立了适用于重金属污土的热导率预测方法,可用于估算特定重金属污染土的热导率值.
To study the thermal transfer characteristics of heavy metal contaminated soil, the contaminated cohesive soil and silty clay soil with different types of pollutants(Pb, Zn), pollution concentration, moisture content, and dry density were mixed in the laboratory by hand. The transient probe was used to measure the thermal conductivity of soils under different conditions. The results show that four types of contaminated soils have following similar trends: under the same moisture content, the thermal conductivity of these soils increases linearly with the increase of the pollution concentration. On the same pollution concentration, the thermal conductivity of these soils increases in exponential function with the increase of the moisture content, and the thermal conductivity increases linearly with the increase of the dry density, which is similar with that of the uncontaminated soil. By analyzing the relationship between the normalized thermal conductivity and the pollution concentration, the prediction method for the thermal conductivity of the heavy metal contaminated cohesive soil and the silty clay soil is established. The method can be used to estimate the thermal conductivity of the specific heavy metal contaminated soil.
作者
潘超
刘松玉
Pan Chao;Liu Songyu(School of Transportation,Southeast University,Nanjing 210096,China;Jiangsu Key Laboratory of Urban Underground Engineering and Environmental Safety,Southeast University,Nanjing 210096,China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第2期362-368,共7页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金重点资助项目(41330641)
关键词
重金属污染土
热导率
含水率
干密度
预测方法
heavy metal contaminated soil
thermal conductivity
moisture content
dry density
prediction method
