One-dimensional analytical model for contaminant transport through CCL under thermal diffusion and its application

被引：0
|
作者：
Zhang C. [1 ]
Huang J. [1 ]
Li X. [1 ]
Xie H. [2 ]
Chen Y. [3 ]
机构：
[1] Jiangxi Province Key Laboratory of Environmental Geotechnical Engineering and Hazards Control, Jiangxi University of Science and Technology, Ganzhou
[2] Center for Balance Architecture, Zhejiang University, Hangzhou
[3] Architectural Design and Research Institute of Zhejiang University Co., Ltd., Hangzhou
来源：
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | 2023年 / 45卷 / 03期
关键词：
analytical model; leachate; simplified design; temperature; thermal diffusion;
D O I：
10.11779/CJGE20211427
中图分类号：
学科分类号：
摘要：
A one-dimensional analytical model as well as the analytical solution for the contaminant transport in compacted clay liner (CCL) is proposed. The dimensionless design curves show that the advection has significant effects on the contaminant transport in CCL. However, with the increases of thermal diffusion, the effects of the advection will decrease. The results of parameter sensitive analysis show when the leachate head reaches 3 m, the 10-year bottom concentration and flux increase by the factors of 3.5～4.9 and 5.9～15.1, respectively, compared with those without the advection. When the thermal diffusion is great enough (M=-5), the bottom concentration and flux increase by the factors of 2.6 and 3.5, respectively, compared with those without the thermal diffusion. The effects of the temperature on the permeability coefficient of CCL should be considered in the design of landfill clay liners. A simplified method for determination of the thickness of the landfill liner is proposed. The simplified method is used to design the liner system at the Jiangcungou Landfill site in Xi 'an. When considering the chloride (Cl-) and arsenic (As) as the index contaminants, the breakthrough time will be longer than 50 years in the case with the thickness of CCL larger than 11.16 m and 1.75 m, respectively. © 2023 Chinese Society of Civil Engineering. All rights reserved.
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页码：541 / 550
页数：9
相关论文
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