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

冯亚松; 辜建强; 杜延军; 李江山; 周实际; 高靖勋; 雷尚武; 王水

doi:10.11779/CJGE20211397

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 English Version

冯亚松^{1, 2, 3,},
辜建强^{1, 2},
杜延军³,
李江山⁴,
周实际³,
高靖勋⁵,
雷尚武⁶,
王水^{1, 2, ,}

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

基金项目:

国家重点研发计划项目 2019YFC1804000

国家重点研发计划项目 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

详细信息

作者简介:
冯亚松(1987—)，男，博士，主要从事环境岩土工程方面的研究工作。E-mail: fengyasongys@126.com

通讯作者:
王水, E-mail: 735621101@qq.com

中图分类号: TU449
计量
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- HTML全文浏览量: 48
- PDF下载量: 69
出版历程
- 收稿日期: 2021-11-23
- 网络出版日期: 2023-02-03
- 发布日期: 2021-11-23
- 刊出日期: 2022-12-31

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

FENG Yasong^{1, 2, 3,},
GU Jianqiang^{1, 2},
DU Yanjun³,
LI Jiangshan⁴,
ZHOU Shiji³,
GAO Jingxun⁵,
LEI Shangwu⁶,
WANG Shui^{1, 2, ,}

1.
Jiangsu Provincial Academy of Environmental Science, Nanjing 210036, China
2.
Jiangsu Provincial Key Laboratory of Environmental Engineering, Nanjing 210036, China
3.
Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China
4.
Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
5.
School of Earth Science and Engineering, Nanjing University, Nanjing 210093, China
6.
Beijing GeoEnviron Engineering & Technology, lnc, Beijing 100095, China

摘要

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。
- 化学氧化 /
- 石油烃 /
- 粉质黏土 /
- 工程特性 /
- 高压旋喷
Abstract: 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 hydrocarbon-contamination (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.
- chemical oxidation /
- petroleum hydrocarbon /
- silty clay /
- geotechnical property /
- jet grouting

HTML全文

图 1 试验区高压旋喷桩桩位与及测试点位示意图

Figure 1. Plan of in-situ tests and layout of columns

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图 2 试验点位地层分布

Figure 2. Soil profile of test site

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图 3 不同试验区土样基本土性参数沿深度变化规律

Figure 3. Basic properties of soils at various depths

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图 4 不同试验区土样界限含水率沿深度变化规律

Figure 4. Atterberg limits of soils at various depths

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图 5 塑性图

Figure 5. Plasticity chart

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图 6 不同试验区土样压缩系数和压缩指数沿深度变化规律

Figure 6. Values of C_a and C_c of soils at various depths

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图 7 不同试验区土样渗透系数沿深度变化规律

Figure 7. Hydraulic conductivities of soils at various depths

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图 8 不同试验区土样k_h/k_v值沿深度变化规律

Figure 8. Values of k_h/k_v of soils at various depths

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图 9 压缩指数与液限关系

Figure 9. Relationship between compression index and liquid limit of soils

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图 10 渗透系数与孔隙比的关系

Figure 10. Relationship between hydraulic conductivity and void ratio of soils

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表 1 工程特性指标变化率

Table 1 Change rates of geotechnical property indexes

工程特性参数	污染区土样	修复区土样
含水率	0.74*	79.91***
密度	1.99*	8.79*
相对质量密度	< 0.01*	0.74*
干密度	1.92*	22.08**
孔隙比	4.06*	65.42***
液限	0.06*	57.89***
塑限	0.48*	55.24***
塑性指数	0.59*	60.51***
压缩系数	8.99*	128.57***
水平渗透系数	28.49**	91.43***
垂向渗透系数	21.78**	91.14***
注：为影响轻微，为影响中等，**为影响大。

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