单裂隙低渗透地层原位氧化修复机制与适用性研究

郑奇腾; 张旭; 冯世进; 陈宏信; 张晓磊

doi:10.11779/CJGE20231293

单裂隙低渗透地层原位氧化修复机制与适用性研究 English Version

郑奇腾^{2, 3,},
张旭²,
冯世进^{1, 2, ,},
陈宏信^{2, 3},
张晓磊^{2, 3}

1.
土木工程防灾减灾全国重点实验室, 上海 200092
2.
同济大学地下建筑与工程系, 上海 200092
3.
岩土及地下工程教育部重点实验室, 上海 200092

基金项目:

国家重大科研仪器研制项目 42227804

国家自然科学基金面上项目 42377152

详细信息

作者简介:
郑奇腾（1991—），男，博士，助理教授，硕士生导师，主要从事环境岩土工程的教学与科研工作。E-mail：089itengzheng@tongji.edu.cn

通讯作者:
冯世进, E-mail: fsjgly@tongji.edu.cn

中图分类号: TU43
计量
- 文章访问数: 191
- HTML全文浏览量: 12
- PDF下载量: 21
出版历程
- 收稿日期: 2023-12-27
- 网络出版日期: 2024-05-29
- 刊出日期: 2025-04-30

Mechanism and application of in-situ oxidation in low-permeability strata with a single fracture

ZHENG Qiteng^{2, 3,},
ZHANG Xu²,
FENG Shijin^{1, 2, ,},
CHEN Hongxin^{2, 3},
ZHANG Xiaolei^{2, 3}

1.
State Key Laboratory of Disaster Reduction in Civil Engineering, Shanghai 200092, China
2.
Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
3.
Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Shanghai 200092, China

摘要

摘要: 低渗透地层具有渗透性差、物质传输困难等特点，传统氧化修复技术（ISCO）难以满足需求，而压裂可以形成优势渗流通道，提升注入氧化剂的影响范围，但目前对压裂协同氧化机制的认识仍不足，相应的设计指南也极为缺乏。因此，考虑复合溶质对流、扩散、反应和天然需氧量（NOD），建立了单裂隙低渗透地层ISCO修复二维轴对称模型，揭示了氧化剂沿孔隙-裂隙多尺度结构的迁移转化与修复机制，研究了注入压力、氧化剂猝灭、污染物非平衡吸附、基质渗透和扩散系数及污染物分布特征对修复效率的影响规律，结果表明压裂ISCO修复技术更适用于基质渗透系数≤10^-7 m/s且扩散系数≤8.4×10^-10 m²/s的低渗透污染地层，且裂隙宜布置在污染羽中下层、氧化剂注入后需持续维持水头，否则修复效果欠佳。最后，对比了不考虑和考虑反应条件下氧化剂的径向和垂向影响范围，提出了相应的设计思路，为压裂増渗协同修复技术的完善提供一定的理论依据。
- 低渗地层 /
- 压裂氧化 /
- 迁移转化 /
- 修复机制 /
- 适用性
Abstract: The low-permeability strata are characterized by poor permeability and difficulty in substance transport. The traditional in-situ chemical oxidation (ISCO) techniques often fall short in addressing these challenges. Hydraulic fracturing creates advantageous flow channels, enhancing the ranges of injected oxidants. However, the current understanding of the synergistic mechanism between fracturing and oxidation remains limited, leading to a lack of corresponding design guidelines. Thus, this study considers compound solute advection, diffusion, reactions and natural oxidant demand (NOD) to establish a two-dimensional axisymmetric model for ISCO remediation in low-permeability strata with a single fracture. It reveals the migration and transformation mechanisms of oxidants across pore-fracture multiscale structures, investigating the influences of injection pressure, oxidant quenching, non-equilibrium adsorption of contaminants, matrix permeability, diffusion coefficients and pollutant distribution on remediation efficiency. The results indicate that the hydraulic fracturing ISCO is more suitable for low-permeability contaminated strata with matrix permeability ≤10^-7 m/s and diffusion coefficients ≤8.4×10^-10 m²/s. Placing fractures in the lower layer of the contaminant plume is suggested, maintaining hydraulic head post-oxidant injection for optimal remediation. Finally, comparisons of radial and vertical ranges of oxidants between with and without considering reaction conditions are made, proposing the corresponding design strategies to refine synergistic hydraulic fracturing-enhanced remediation technologies based on the theoretical foundations.
- low-permeability stratum /
- fracturing oxidation /
- migration transformation /
- remediation mechanism /
- applicability

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图 1 压裂黏土地层中氧化修复二维轴对称模型示意图

Figure 1. Schematic diagram of a two-dimensional axisymmetric model for ISCO in a fractured clay stratum

下载: 全尺寸图片幻灯片

图 2 氧化剂总量时变曲线

Figure 2. Time-varying curves of total amount of oxidant (a) ignoring and (b) considering reaction

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图 3 不同注入条件下第200天污染物浓度分布

Figure 3. Distribution of contamination concentration on 200^th day under different injection conditions

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图 4 不同注入条件下TCE残余率的时变曲线

Figure 4. Time-varying curves of TCE residual rate under different injection conditions

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图 5 不同基质渗透系数下第200天沿裂隙和垂直于裂隙的TCE浓度分布

Figure 5. Distribution of TCE concentration (a) in fracture and (b) perpendicular to fracture on 200^th day for different values of matrix permeability

下载: 全尺寸图片幻灯片

图 6 不同基质渗透系数下TCE残余率时变曲线

Figure 6. Time-varying curves of TCE residual rate under different values of matrix permeability

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图 7 不同基质扩散系数下第200天氧化剂和污染物浓度空间分布和TCE残余率时变曲线

Figure 7. (a) Spatial distribution of oxidant and contamination concentration on 200^th day and (b) time-varying curves of TCE residual rate, for different matrix diffusion coefficients

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图 8 不同污染分布特征下TCE残余率的时变曲线

Figure 8. Time-varying curves of TCE residual rate under different characteristics of contamination distribution

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图 9 不同注入流速下裂隙中流速分布和TCE残余率时变曲线

Figure 9. (a) Distribution of velocity distribution in fracture and (b) TCE residual rate, for different injection velocities

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图 10 氧化剂迁移范围说明以及垂向VD和径向FD随基质渗透系数和扩散系数的变化

Figure 10. (a) Explanation of migration area and parameters of oxidants; The relationship between vertical VD and radial FD of partial and total pollution of soil with (b) permeability and (c) diffusion coefficient on 200^th day

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表 1 模拟所用的基本参数

Table 1 Values of parameters in simulation

参数		符号含义	单位	参数值	文献
土体参数	n_s	基质孔隙率	1	0.42	文献[22]
	k_s	基质渗透系数	m/s	10^-8	文献[22]
	ρ_d	土体干密度	kg/m³	1700
裂隙参数	d_f	裂隙孔径	cm	1	文献[25]
	D_f	裂隙深度	m	5	文献[27]
	n_f	裂隙孔隙率	1	0.7	文献[25]
反应物基本参数	M_MnO4^-	高锰酸钾摩尔质量	g/mol	158	文献[23]
	M_TCE	TCE摩尔质量	g/mol	131	文献[23]
	D_MnO4^-	氧化剂扩散系数	m²/s	1.4×10^-9	文献[24]
	D_TCE	TCE扩散系数	m²/s	8.4×10^-10	文献[24]
	k_react	反应速率常数	m³/mol/s	6.5×10^-4	文献[26]
	a	理想状态下摩尔比	1	2
	C_s	高锰酸钾溶解度	kg/m³	63.99

下载: 导出CSV

表 2 氧化剂猝灭和非平衡吸附参数

Table 2 Values of parameters-related oxidant quenching and nonequilibrium adsorption

符号	参数含义	参数值	单位	来源
k_de	猝灭系数	0.01	1/d
k_s	非平衡吸附动力学系数	1.75×10^-4	1/s	文献[30]
S_k	非平衡吸附相上吸附浓度	—	mol/kg	文献[30]
K_F	Freundich分配系数	4×10^-4	m³/kg	文献[30]
F	平衡吸附占比	0.22	—	文献[30]

下载: 导出CSV

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