考虑固结作用下非均质隔离墙系统中重金属污染物二维运移特性研究

doi:10.13722/j.cnki.jrme.2023.1092

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (1707 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要固结行为会使隔离墙的工程性质沿深度呈非均质性，影响墙体中重金属污染物的运移规律，但相关研究较少。首先，建立非均质隔离墙系统(由缓冲层、非均质隔离墙和含水层组成)中重金属污染物二维运移模型，该模型考虑了固结作用和Langmuir吸附特征。随后，利用数值方法对该模型进行求解，并通过与试验测定结果及其他2种计算方法所得结果对比，验证了模型合理性。在此基础上，开展重金属污染物运移特性研究。结果表明，与忽略固结作用相比，考虑固结作用下隔离墙上部区域的浓度会增大，底部区域的浓度会降低。考虑Langmuir吸附场景下重金属污染物的运移速率高于考虑线性吸附场景下，且2种场景下相对浓度的差异随污染源浓度升高而更显著。进一步，防渗效果评价显示，缓冲层厚度增大有利于延长隔离墙的服役寿命，但鉴于“围护式”隔离墙被广泛应用于实际工程，因而其厚度不应太大。此外，相较于考虑固结作用场景，忽略固结作用场景可能会高估隔离墙的防渗性能。隔离墙厚度及其吸附能力的增大均可提高墙体防渗性能，工程实践中可综合二者开展防污屏障设计。所建模型及研究结果可为隔离墙的有效设计和服役性能评价提供指导。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	江文豪1
	2
	3
	黄啸1
	2
	3
	冯晨1
	2
	3
	李江山1
	2
	3

关键词 ：环境科学, 固结, 非均质隔离墙, 缓冲层, 重金属污染物, 二维运移, Langmuir吸附

Abstract：Consolidation behaviour results in non-homogeneous engineering properties of the cutoff wall along the depth，thus affecting the transport characteristics of heavy metal pollutants(HMPs) in the cutoff wall. However，the associated studies are limited. In this paper，a two-dimensional transport model for HMPs in a non-homogeneous cutoff wall system(consisting of a buffer layer，a non-homogeneous cutoff wall and an aquifer) is developed，where the consolidation effect and the Langmuir adsorption features are considered. Then，the proposed model is solved through a numerical approach and its validity is verified by comparing with the experimental measurements and the calculation results of the two other calculation methods. On such basis，a study on the transport characteristics of HMPs is performed and the results show that the concentration in the upper zone of the cutoff wall increases and the concentration in the bottom zone reduces when the consolidation effect is considered compared to it is neglected. The transport rate of HMPs in the Langmuir adsorption scenario is higher than that in the linear adsorption scenario，and the difference in relative concentrations between the two scenarios becomes more significant with growing concentration of the pollution source. Furthermore，the evaluation of barrier performance reveals that the increase of the buffer layer?s thickness is beneficial in prolonging the cutoff wall?s service life. Nevertheless，the buffer layer?s thickness should not be too large given that the “enclosure” cutoff wall is widely applied in practical engineering. Besides，ignoring the consolidation scenario may overestimate the barrier performance of the cutoff wall compared to considering the consolidation scenario. Both the increase in the cutoff wall?s thickness and its adsorption capacity can improve its barrier performance，and the two aspects can be combined to conduct the design of anti-fouling barriers in engineering practice. The proposed model as well as the obtained laws in this paper can provide guidance for the effective design and the service performance evaluation of cutoff walls.

Key words： environmental sciences consolidation non-homogeneous cutoff wall buffer layer heavy metal pollutants two-dimensional transport Langmuir adsorption

引用本文:

江文豪1，2，3，黄啸1，2，3，冯晨1，2，3，李江山1，2，3. 考虑固结作用下非均质隔离墙系统中重金属污染物二维运移特性研究[J]. 岩石力学与工程学报, 2024, 43(7): 1722-1735.
JIANG Wenhao1，2，3，HUANG Xiao1，2，3，FENG Chen1，2，3，LI Jiangshan1，2，3. Study on the two-dimensional transport characteristics of heavy metal pollutants in a non-homogeneous cutoff wall system considering the consolidation effect. , 2024, 43(7): 1722-1735.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.1092 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/I7/1722

[23]	WANG Y，CHEN Y，XIE H，et al. Lead adsorption and transport in loess-amended soil-bentonite cut-off wall[J]. Engineering Geology，2016，215：69-80.
[10]	RUBIN H，RABIDEAU A J. Approximate evaluation of contaminant transport through vertical barriers[J]. Journal of Contaminant Hydrology，2000，40(4)：311-333.
[9]	CHEN Z L，FENG S J，CHEN H X，et al. Analytical solution for transport of degradable contaminant in cut-off wall and aquifer[J]. Environmental Geotechnics，2023，10(1)：44-56.
[12]	CHEN G N，CLEALL P J，LI Y C，et al. Decoupled advection-dispersion method for determining wall thickness of slurry trench cutoff walls[J]. International Journal of Geomechanics，2018，18(5)：06018007.
[14]	YAN H X，XIE H J，WANG S Y，et al. A two-dimensional analytical model for organic contaminant transport in cutoff wall and aquifer system[J]. International Journal for Numerical and Analytical Methods in Geomechanics，2021，45(5)：631-647.
[16]	梅丹兵. 土-膨润土系竖向隔离工程屏障阻滞重金属污染物运移的模型试验研究[硕士学位论文][D]. 南京：东南大学，2017.(MEI Danbing. Model test study of limiting migration of heavy metal of soil-bentonite vertical cutoff wall[M. S. Thesis][D]. Nanjing：Southeast University，2017.(in Chinese))
[17]	杨玉玲，杜延军，任伟伟，等. 磷酸盐对铅污染土-膨润土竖向隔离墙材料沉降特性影响的试验研究[J]. 岩土工程学报，2015，37(10)：1 856-1 864.(YANG Yuling，DU Yanjun，REN Weiwei，et al. Experimental study on effect of phosphates on sedimentation behavior of lead-contaminated soil-bentonite slurry wall backfills[J]. Chinese Journal of Geotechnical Engineering，2015，37(10)：1 856-1 864.(in Chinese))
[19]	LI Y C，CLEALL P J，WEN Y D，et al. Stresses in soil-bentonite slurry trench cut-off walls[J]. Géotechnique，2015，65(10)：843-850.
[22]	LIU X F，PATRICK H，BOGDAN M，et al. Heavy metal retention properties of kaolin and bentonite in a wide range of concentration and different pH conditions[J]. Applied Clay Sciences，2016，119：365-374.
[2]	刘松玉. 污染场地测试评价与处理技术[J]. 岩土工程学报，2018，40(1)：1-37.(LIU Songyu. Geotechnical investigation and remediation for industrial contaminated sites[J]. Chinese Journal of Geotechnical Engineering，2018，40(1)：1-37.(in Chinese))
[4]	HONG C S，SHACKELFORD C D，MALUSIS M A. Consolidation and hydraulic conductivity of zeolite-amended soil-bentonite backfills[J]. Journal of Geotechnical and Geoenvironmental Engineering，2012，138(1)：15-25.
[6]	XU H，SHU S，WANG S，et al. Studies on the chemical compatibility of soil-bentonite cut-off walls for landfills[J]. Journal of Environmental Management，2019，237：155-162.
[7]	武猛，赵泽宁，王才进，等. 基于贝叶斯-粒子群优化算法的污染场地隔离墙阻隔效果CPTU原位评价方法[J]. 岩石力学与工程学报，2023，42(2)：483-496.(WU Meng，ZHAO Zening，WANG Caijin，et al. In-situ evaluation of barrier performance of cutoff wall based on Bayesian-Particle swarm optimization using piezocone penetration test[J]. Chinese Journal of Rock Mechanics and Engineering，2023，42(2)：483-496.(in Chinese))
[52]	THOMAS R W，KOERNER R M. Advances in HDPE barrier walls[J]. Geotextiles and Geomembranes，1996，14(7/8)：393-408.
[20]	童星，李育超，柯瀚，等. 土-膨润土隔离墙应力状态与固结行为的现场试验研究[J]. 岩土力学，2018，39(6)：2 131-2 138. (TONG Xing，LI Yuchao，KE Han，et al. Field test on the stress state and consolidation behavior of soil-bentonite cutoff walls[J]. Rock and Soil Mechanics，2018，39(6)：2 131-2 138.(in Chinese))
[24]	HONG C S，SHACKELFORD C D，MALUSIS M A. Adsorptive behavior of zeolite-amended backfills for enhanced metals containment[J]. Journal of Geotechnical and Geoenvironmental Engineering，2016，142(7)：04016021.
[26]	LI Y，ZENG X，LIN Z，et al. Experimental study on phosphate rock modified soil-bentonite as a cut-off wall material[J]. Water Supply，2022，22(2)：1 676-1 690.
[27]	HONG C S，SHACKELFORD C D，MALUSIS M A. Numerical evaluation of vertical cutoff walls comprising zeolite amended backfills for enhanced metals containment[J]. Journal of Geotechnical and Geoenvironmental Engineering，2017，143(7)：04017028.
[30]	TONG X，LI Y C，KE H，et al. In situ stress states and lateral deformations of soil-bentonite cutoff walls during consolidation process[J]. Canadian Geotechnical Journal，2020，57(1)：139-148.
[32]	SAMPLE-LORD K M，AHMED M，MALUSIS M A. Diffusion through soil-bentonite backfill from a constructed vertical cutoff wall[J]. Soils and Foundations，2021，61(3)：429-443.
[34]	童星. 土-膨润土力学水力特性及其隔离墙的固结行为研究[博士学位论文] [D]. 杭州：浙江大学，2017.(TONG Xing. Mechanical and hydraulic properties of soil-bentonite and consolidation behavior of cutoff wall[Ph. D. Thesis][D]. Hangzhou：Zhejiang University，2017.(in Chinese))
[36]	郑紫荆，朱云海，王巧，等. 有机污染物在含土工膜复合隔离墙和含水层系统的运移半解析模型[J]. 岩土力学，2022，43(2)：453-465.(ZHENG Zijing，ZHU Yunhai，WANG Qiao，et al. A semi-analytical model for analyzing the transport of organic pollutants through the geomembrane composite cut-off wall and aquifer system[J]. Rock and Soil Mechanics，2022，43(2)：453-465.(in Chinese))
[37]	YANG Y L，REDDY K R，ZHANG W J，et al. SHMP-amended Ca-bentonite/sand backfill barrier for containment of lead contamination in groundwater[J]. International Journal of Environmental Research and Public Health，2020，17(1)：370.
[40]	BRADL H B. Adsorption of heavy metal ions on soils and soils constituents[J]. Journal of Colloid and Interface Science，2004，277(1)：1-18.
[42]	张金利，张林林. 重金属Pb(Ⅱ)在黏土上吸附特性研究[J]. 岩土工程学报，2012，34(9)：1 584-1 589.(ZHANG Jinli，ZHANG Linlin. Adsorption behaviors of heavy metal Pb(II) on clay[J]. Chinese Journal of Geotechnical Engineering，2012，34(9)：1 584-1 589.(in Chinese))
[1]	沈胜强，杜延军，魏明俐，等. CaCl2作用下PAC改良膨润土滤饼的渗透特性研究[J]. 岩石力学与工程学报，2017，36(11)：2 810-2 817.(SHEN Shengqiang，DU Yanjun，WEI Mingli，et al. Hydraulic conductivity of filter cakes of polyanionic cellulose-amended bentonite slurries in calcium chloride solutions[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(11)：2 810-2 817.(in Chinese))
[3]	傅贤雷，杜延军，沈胜强，等. PAC 改性膨润土/砂竖向阻隔屏障回填料化学渗透膜效应及扩散特性研究[J]. 岩石力学与工程学报，2020，39(增2)：3 669-3 675.(FU Xianlei，DU Yanjun，SHEN Shengqiang，et al. Chemico-osmotic membrane behavior and diffusive properties of PAC amended bentonite/sand vertical cutoff wall backfills[J]. Chinese Journal of Rock Mechanics and Engineering，2020，39(Supp.2)：3 669-3 675.(in Chinese))
[5]	YANG Y L，REDDY K R，DU Y J，et al. Sodium hexametaphosphate (SHMP)-amended calcium bentonite for slurry trench cutoff walls：workability and microstructure characteristics[J]. Canadian Geotechnical Journal，2018，55(4)：528-537.
[8]	LI Y C，CHEN G N，CHEN Y M，et al. Design charts for contaminant transport through slurry trench cutoff walls[J]. Journal of Environmental Engineering，2017，143(9)：6017005.
[11]	NEVILLE C J，ANDREWS C B. Containment criterion for contaminant isolation by cutoff walls[J]. Groundwater，2006，44(5)：682-686.
[13]	XIE H J，WANG S Y，CHEN Y，et al. An analytical model for contaminant transport in cut-off wall and aquifer system[J]. Environmental Geotechnics，2020，7(7)：457-466.
[15]	DING X H，FENG S J，ZHENG Q T，et al. A two-dimensional analytical model for organic contaminants transport in a transition layer-cutoff wall-aquifer system[J]. Computers and Geotechnics，2020，128：103816.
[18]	RUFFING D G，EVANS J C，RYAN C R. Strength and stress estimation in soil bentonite slurry trench cutoff walls using cone penetration test data[C]// Geotechnical Special Publication，[S.l.]：[s.n.]，2015：2 567-2 576.
[21]	TONG S，WEI L L，EVANS J C，et al. Numerical analysis of consolidation behavior of soil-bentonite backfill in a full-scale slurry trench cutoff wall test[J]. Soils and Foundations，2022，62(5)：101188.
[28]	YEO S S，SHACKELFORD C D，EVANS J C. Consolidation and hydraulic conductivity of nine model soil-bentonite backfills[J]. Journal of Geotechnical and Geoenvironmental Engineering，2005，131(10)：1 189-1 198.
[38]	FILZ G M，HENRY L B，HESLIN G M，et al. Determining hydraulic conductivity of soil-bentonite using the API filter press[J]. Geotechnical Testing Journal，2001，24(1)：61-71.
[44]	张明，赵有明，刘国楠，等. 双层砂井地基大变形固结方程差分解[J]. 岩土工程学报，2013，35(9)：1 666-1 674.(ZHANG Ming，ZHAO Youming，LIU Guonan，et al. Finite difference solution to equation for large-strain consolidation of double-layered vertical drain ground[J]. Chinese Journal of Geotechnical Engineering，2013，35(9)：1 666-1 674.(in Chinese))
[47]	LU H，LUAN M，ZHANG J. Transport of Cr(VI) through clay liners containing activated carbon or acid-activated bentonite[J]. Applied Clay Science，2010，50(1)：99-105.
[48]	LEE J，FOX P J，LENHART J J. Investigation of consolidation-induced solute transport. I：effect of consolidation on transport parameters[J]. Journal of Geotechnical and Geoenvironmental Engineering，2009，135(9)：1 228-1 238.
[50]	中华人民共和国国家标准编写组. GB/T 14848—2017地下水质量标准[S]. 北京：中国标准出版社，2017.(The National Standards Compilation Group of the People's Republic of China. GB/T 14848—2017 Groundwater quality standard[S]. Beijing；China Standard Publishing House，2017.(in Chinese))
[54]	彭春辉，冯世进，陈宏信，等. 地下水渗流条件下土工膜复合隔离墙中有机污染物迁移研究[J]. 岩土工程学报，2021，43(11)：2 055-2 063.(PENG Chunhui，FENG Shijin，CHEN Hongxin，et al. Migration of organic contaminants in composite geomembrane cut-off wall considering groundwater seepage[J]. Chinese Journal of Geotechnical Engineering，2021，43(11)：2 055-2 063.(in Chinese))
[25]	YANG Y L，REDDY K R，DU Y J，et al. Retention of Pb and Cr(VI) onto slurry trench vertical cutoff wall backfill containing phosphate dispersant amended Ca-bentonite[J]. Applied Clay Science，2019，168：355-365.
[33]	丁祥鸿，冯世进. 固结作用下非均质隔离墙中污染物二维运移规律研究[J]. 岩土工程学报，2022，44(3)：584-590.(DING Xianghong，FENG Shijin. Two-dimensional migration of contaminants in non-homogeneous cutoff wall considering consolidation[J]. Chinese Journal of Geotechnical Engineering，2022，44(3)：584-590.(in Chinese))
[43]	WANG J，ZHANG W. Evaluating the adsorption of Shanghai silty clay to Cd(II)，Pb(II)，As(V)，and Cr(VI)：kinetic，equilibrium，and thermodynamic studies[J]. Environmental Monitoring and Assessment，2021，193(3)：1-23.
[53]	QIAN X，ZHENG Z，GUO Z，et al. Applications of geomembrane cutoff walls in remediation of contaminated sites[C]// Proceedings of the 8th International Congress on Environmental Geotechnics. Singapore：Springer，2018：335-342.
[29]	BOHNHOFF G L，SHACKELFORD C D. Hydraulic conductivity of polymerized bentonite-amended backfills[J]. Journal of Geotechnical and Geoenvironmental Engineering，2014，140(3)：04013028.
[35]	JIANG W H，GE S Q，FENG C，et al. Finite-difference model for two-dimensional transport of degradable organic contaminants in a buffer layer-cutoff wall-aquifer system accounting for the consolidation behavior[J]. Computers and Geotechnics，2023，162：105674.
[45]	江辉煌，刘国楠，赵有明. Gibson一维固结方程的一种求解方法[J]. 岩土工程学报，2010，32(5)：745-750.(JIANG Huihuang，LIU Guonan，ZHAO Youming. A solution of Gibson?s governing equation of one-dimensional consolidation[J]. Chinese Journal of Geotechnical Engineering，2010，32(5)：745-750.(in Chinese))
[31]	MOTT H V，WEBER W J. Factors influencing organic contaminant diffusivities in soil-bentonite cutoff barriers[J]. Environmental Science and Technology，1991，25(10)：1 708-1 715.
[39]	PARK J K，KIM J Y，MADSEN C D，et al. Retardation of volatile organic compound movement by a soil-bentonite slurry cutoff wall amended with ground tires[J]. Water Environment Research，1997，69(5)：1 022-1 031.
[41]	LU S G，XU Q F. Competitive adsorption of Cd，Cu，Pb and Zn by different soils of Eastern China[J]. Environmental Geology，2009，57(3)：685-693.
[49]	ZENG X，LIU X，LI Y H. The breakthrough time analyses of lead ions in CCL considering different adsorption isotherms[J]. Advances in Civil Engineering，2020，2020：8861866.
[51]	刘宜昭，陆阳，刘松玉. 改性水泥土墙隔离重金属污染的服役时间分析研究[J]. 岩土工程学报，2023，45(4)：785-795.(LIU Yizhao，LU Yang，LIU Songyu. Breakthrough time of amended cement-soil cutoff wall permeated by heavy metal solutions[J]. Chinese Journal of Geotechnical Engineering，2023，45(4)：785-795.(in Chinese))
[46]	江文豪，冯晨，李江山. 饱和黏土一维非线性固结与热传导耦合模型[J]. 岩石力学与工程学报，2023，42(10)：2 588-2 600.(JIANG Wenhao，FENG Chen，LI Jiangshan. Coupled model for one-dimensional nonlinear consolidation and heat conduction in saturated clay[J]. Chinese Journal of Rock Mechanics and Engineering，2023，42(10)：2 588-2 600.(in Chinese))