农药污染场地工程特性与电阻率评价方法研究

This project chooses the evaluation of engineering characteristics of the pesticide contaminated site as the research object, and the following key issues will be studied in typical organic pesticide contaminated sites by organochlorine and organophosphorus based on in situ resistivity piezocone penetration testing (CPTU), laboratory testing combined with theory analysis. Firstly, on the basis of the laboratory testing results of basic engineering characteristics of contaminated clayey soils by different organic pesticide ingredients and concentration, the variation rule of engineering characteristics index and resistivity will be analyzed after the invasion of organic pesticide pollutant. Secondly, through the variation analysis of mineral and ion chemical composition with resistivity of clayey soils after the invasion of organic pesticide pollutant, the physicochemical mechanism to influence engineeing characteristics of clayey soils by organic pesticide will be investigated. Lastly, the relationship model between macroscopic engineering characteristics index and resistivity of clayey soil contaminated by organic pesticide will be developed. The method to evaluate the engineering characteristics of the contaminated site by organic pesticide from the resistivity CPTU will be proposed. On the basis of the research results, the complete system for rapid estimation of contaminated site by organic pesticide from resistivity in situ testing will likely be established. The project has theoretical significance to improve cognitive level of the engineering characteristics of industrial contaminated site and to enhance the in situ testing and treatment technique level in our country.

本项目以农药污染场地工程特性评价为研究对象，采用电阻率孔压静力触探（CPTU）原位测试，室内试验联合理论分析，选择典型农药（有机氯、有机磷）污染场地开展如下关键问题研究：通过不同农药成分与浓度的污染粘性土的基本工程特性试验，分析粘性土在农药污染物侵入后工程特性和电阻率的变化规律；通过粘性土在农药污染物侵入后矿物、离子化学成分及电阻率变化分析，研究农药影响粘性土工程特性的物理化学机理；建立农药污染场地土的宏观工程特性指标与电阻率的关系模型，提出基于电阻率CPTU的农药污染场地土的工程特性评价方法。项目成果有望建立一套较完整的基于电阻率原位测试的农药污染场地工程特性快速评价体系，提高对农药污染场地工程特性的认知水平，对提高我国工业污染场地的原位测试和处置技术水平具有重要的理论意义。

本项目以农药污染场地工程特性评价为研究对象，采用电阻率孔压静力触探（CPTU）原位测试，室内试验联合理论分析，选择典型农药污染场地开展了深入研究，配制了不同浓度的氯氰菊酯农药污染土试样。对不同龄期的污染土样分别进行了颗粒分析、液塑限、pH值、电阻率测试、电镜扫描（SEM）等试验。取得的主要成果有：（1）通过不同农药成分与浓度的污染粘性土的基本工程特性试验，揭示了粘性土在农药污染物侵入后工程特性和电阻率的变化规律；（2）通过粘性土在农药污染物侵入后矿物、离子化学成分及电阻率变化分析，分析了农药影响粘性土工程特性的物理化学机理；（3）建立了农药及其他有机物污染场地土的宏观工程特性指标与电阻率的关系模型，提出了基于电阻率CPTU的工业有机污染场地土的工程特性评价方法。项目成果建立了一套基于电阻率原位测试的典型工业有机物污染场地工程特性快速评价体系，对提高我国工业污染场地的原位测试和处置技术水平具有重要的理论意义。