原位高压旋喷化学氧化对石油烃污染粉质黏土工程特性的影响  

Effects of in-situ jet grouting-aided chemical oxidation on geotechnical properties of petroleum hydrocarbon-contaminated silty clay

作　　者：冯亚松 辜建强 杜延军[3] 李江山[4] 周实际 高靖勋 雷尚武 王水[1,2] FENG Yasong;GU Jianqiang;DU Yanjun;LI Jiangshan;ZHOU Shiji;GAO Jingxun;LEI Shangwu;WANG Shui(Jiangsu Provincial Academy of Environmental Science,Nanjing 210036,China;Jiangsu Provincial Key Laboratory of Environmental Engineering,Nanjing 210036,China;Institute of Geotechnical Engineering,Southeast University,Nanjing 210096,China;Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;School of Earth Science and Engineering,Nanjing University,Nanjing 210093,China;Beijing GeoEnviron Engineering&Technology,lnc,Beijing 100095,China)

机构地区：[1]江苏省环境科学研究院,江苏南京210036 [2]江苏省环境工程重点实验室,江苏南京210036 [3]东南大学岩土工程研究所,江苏南京211189 [4]中国科学院武汉岩土力学研究所,湖北武汉430071 [5]南京大学地球科学与工程学院,江苏南京210093 [6]北京高能时代环境技术股份有限公司,北京100095

出　　处：《岩土工程学报》2023年第1期153-161,I0009,共10页Chinese Journal of Geotechnical Engineering

基　　金：国家重点研发计划项目(2019YFC1804000,2019YFC1806000);南京市博士后科研资助计划项目(2021040);江苏省环境工程重点实验室开放课题(ZX2018009)。

摘　　要：化学氧化广泛应用于石油烃污染土壤修复,但化学氧化作用对石油烃污染黏性土工程特性的影响尚不明晰。通过原位高压旋喷化学氧化试验,对比分析石油烃污染与氢氧化钠活化过硫酸钠氧化作用对长江下游地区粉质黏土工程特性的影响,并定量评价石油烃污染和化学氧化作用对土的工程特性影响程度。结果表明:石油烃污染(720 mg/kg)对粉质黏土的渗透性影响程度为中等;掺量为3%的氢氧化钠活化过硫酸钠氧化作用对石油烃污染土的干密度影响程度为中等,对含水率、孔隙比、界限含水率、压缩性、渗透性影响程度为大;未污染土、污染土和修复土的压缩指数与液限存在良好的线性关系;未污染土和污染土的渗透系数与孔隙比在半对数坐标系中存在良好的正相关关系;而修复土的渗透系数与孔隙比关联关系较差。研究结果为长江经济带类似污染场地的修复与安全再利用提供指导。The chemical oxidation is a widely used remediation technology for petroleum hydrocarbon-contaminated soils.However,the effects of in-situ chemical oxidation on the geotechnical properties of contaminated soils are unclear.An in-situ jet grouting-aided chemical oxidation test is conducted at a petroleum hydrocarbon-contaminated site located at the lower reaches of the Yangtze River.The effects of petroleum hydrocarbon-contamination and chemical oxidation on the geotechnical properties of the studied silty clay are investigated,and the corresponding degrees of effects(DOEs) of series geotechnical parameters are evaluated as per China GB 50021-2001.The test results show that the DOEs of petroleum hydrocarboncontamination(720 mg/kg) on the hydraulic conductivity are moderate.The DOEs of sodium hydroxide-activated sodium persulfate addition(3%) on the dry density are moderate,and those on the water content,void ratio,Atterberg limits,compressibility and hydraulic conductivity are significant.The compression indexes and the liquid limits of clean,contaminated,and treated soils exhibit a linear relationship.Furthermore,a positive correlation relationship is observed between the hydraulic conductivity and the void ratio of the clean and contaminated soils on the semilogarithm coordinate.

关 键 词：化学氧化 石油烃 粉质黏土 工程特性 高压旋喷 

分 类 号：TU449[建筑科学—岩土工程]