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以重庆市长生桥垃圾填埋场作为研究对象,基于垃圾土颗粒导电性分类,通过室内试验测试了不同因素(添加不同溶液、孔隙率、含水率、温度等)影响下垃圾土电阻率变化特征。试验结果表明:当垃圾土中添加渗滤液、Na Cl、Zn Cl2和柴油4种溶液时,垃圾土电阻率随垃圾土中孔隙率的增加均呈递减趋势;孔隙率一定时,随含水率的增加垃圾土中固液并联导电在垃圾土导电通路中的比例增大;渗滤液对垃圾土电阻率的影响在一定程度上受稀释作用控制,且随含水率的增加而减小;随着温度的升高,垃圾土的电阻率呈指数函数衰减趋势;含水率一定时,孔隙率的变化将引起垃圾土中3种导电模式的互相转化,且电阻率随孔隙率的增加呈幂函数减小趋势;利用高密度电阻率层析技术,对现场垃圾填埋体进行了电阻率实测,同时结合室内试验测试结果对电阻率剖面进行了分析;研究结果可为分析因降解引起的垃圾填埋体中渗滤液的富集状态和运移途径的变化,以及评价垃圾土内部结构的演化提供理论支持。
Taking Changshengqiao landfill in Chongqing as a research object, based on the conductive particle classification of refuse soil, the characteristics of refuse soil resistivity under the influence of different factors (adding different solutions, porosity, moisture content, temperature, etc.) . The results show that when the leachate, Na Cl, Zn Cl2 and diesel oil are added into the landfill, the resistivity of the landfill soil decreases with the increase of the porosity in the landfill soil. When the porosity is constant, Increasing the ratio of solid-liquid parallel conduction in landfill soil increases the proportion of conductive path in landfill soil. The influence of leachate on the resistivity of landfill is controlled to a certain degree by dilution and decreases with the increase of water content. , The resistivity of rubbish soil declines exponentially; when the water content is constant, the change of porosity will cause the conversion of three conductivity modes in rubbish soil, and the resistivity decreases exponentially with the increase of porosity The resistivity of the landfill was measured by high-density resistivity tomography, and the resistivity profile was also analyzed with the indoor test results. The results of the study can be used to analyze the landfill caused by degradation Leachate enrichment status and transport changes in the way, and evaluation of the internal structure of landfill soil evolution provide theoretical support.