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| Thermo-hydro-mechanical-chemical coupling mechanism in clay liner under large strain conditions |
| QIAN Yujie1, LI Chuanxun1*, CHEN Qun2, LIU Xiaozhao3,4, GUO Xiao5 |
| (1. Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. China Communications highway planning and Design Institute Co., Ltd., Beijing 100010, China; 3. Jiangsu Environmental Geological Survey, Nanjing, Jiangsu 210012, China; 4. Nanjing Engineering Research Center of Geological Environment Safety and Protection, Nanjing, Jiangsu 210012, China; 5. Zhejiang Highway and Waterage Engineering Consulting Co., Ltd., Hangzhou, Zhejiang 310006, China) |
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Abstract The performance evaluation of clay liners for seepage prevention and isolation is widely applied in engineering fields, including municipal solid waste landfills, hazardous waste landfills, and remediation of contaminated sites. However, most existing studies have only conducted simple coupling analyses based on 2 to 3 physical processes among the Thermal-Hydro-Mechanical-Chemical (THMC) multi-physics framework, often neglecting the nonlinear variations of several important parameters in their models. To investigate the mutual feedback coupling mechanisms of the THMC multi-physics involved in clay liners, this study adopted a large-strain nonlinear consolidation model. This model incorporates the effects of chemical osmotic pressure induced by contaminant transport on soil consolidation, as well as the impacts of temperature rise on the physical-mechanical properties of soils and contaminant transport characteristics. A comprehensive large-strain nonlinear model for heat transfer, consolidation, and contaminant transport was established within the context of THMC multi-physics mutual coupling, along with its numerical solution. The correctness and applicability of the proposed coupling model were verified by comparing contaminant transport characteristics and soil consolidation settlement under specific scenarios. Based on this analysis, the mutual feedback coupling mechanisms and influencing factors among the THMC multi-physics in clay liners were thoroughly discussed. The results indicate that the introduction of coupling effects from temperature and chemical interactions on consolidation and contaminant transport accelerates soil settlement rates, increases peak settlement, and exacerbates the “over-consolidation” phenomenon caused by chemical loads. Additionally, the incorporation of thermal dynamics not only accelerates the dissipation of excess pore water pressure but also enhances the contaminant transport rate, with the effects becoming more pronounced over time. Furthermore, chemical osmotic pressure can induce negative excess pore water pressure, resulting in the overall excess pore water pressure of the soil remaining negative even during the long-term consolidation stage, which complicates complete dissipation post-consolidation. Finally, the model was applied to an unregulated landfill, demonstrating that the established model possesses strong engineering applicability.
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[1] 裴洪军，谢 浩，程天舜，等. 断层对垃圾填埋场地下水COD迁移影响的模拟：以深圳龙华能源生态园为例[J]. 地质科技通报，2026，待刊.(PEI Hongjun，XIE Hao，CHENG Tianshun，et al. Simulation of fault influence on groundwater COD transport in landfill sites: a case study of Longhua Energy Eco-Park，Shenzhen[J]. Bulletin of Geological Science and Technology，2026，to be pressed.(in Chinese))
[2] 江文豪，黄 啸，冯 晨，等. 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)：1 722–1 735.(JIANG Wenhao，HUANG Xiao，FENG Chen，et al. Study on the two-dimensional transport characteristics of heavy metal pollutants in a non-homogeneous cutoff wall system considering the consolidation effect[J]. Chinese Journal of Rock Mechanics and Engineering，2024，43(7)：1 722–1 735.(in Chinese))
[3] SMITH D W. One–dimensional contaminant transport through a deforming porous medium: theory and a solution for a quasi-steady-state problem[J]. International Journal for Numerical and Analytical Methods in Geomechanics，2000，24(8)：693–722.
[4] FOX P J，LEE J，LENHART J J. Coupled consolidation and contaminant transport in compressible porous media[J]. International Journal of Geomechanics，2011，11(2)：113–123.
[5] LI X B，SHEN Y H，YU X Y，et al. Analytical solution for one-dimensional chemo-hydro-mechanical coupled consolidation under time-dependent loading in buffer clay layer[J]. Canadian Geotechnical Journal，2025，62：1–13.
[6] 江文豪，李江山，冯 晨. 考虑力学–化学荷载下压实黏土垫层中一维非线性固结与污染物运移耦合模型[J]. 岩土工程学报，2023，45(11)：2 289–2 298.(JIANG Wenhao，LI Jiangshan，FENG Chen. Coupled model for one-dimensional nonlinear consolidation and contaminant transport in a compacted clay liner considering mechanical–chemical loading[J]. Chinese Journal of Geotechnical Engineering，2023，45(11)：2 289–2 298.(in Chinese))
[7] 孙锦鑫，李江山，王 平，等. 热–力荷载作用下考虑有效孔隙比的饱和黏土一维非线性热固结耦合机制研究[J]. 岩石力学与工程学报，2025，44(7)：1 933–1 949.(SUN Jinxin，LI Jiangshan，WANG Ping，et al. Coupling mechanisms for the one-dimensional nonlinear thermal consolidation of saturated clay under thermal-mechanical loading with consideration of effective void ratio[J]. Chinese Journal of Rock Mechanics and Engineering，2025，44(7)：1 933–1 949.(in Chinese))
[8] JIANG W H，LI J S，GE S Q. Numerical study for one-dimensional non–isothermal transport of organic contaminant in the three-layer composite liner containing a defective geomembrane[J]. International Journal of Heat and Mass Transfer，2025，237：126417.
[9] 李江山，江文豪，葛尚奇，等. 非等温分布条件下压实黏土衬垫中固结与污染物运移耦合模型研究[J]. 岩土工程学报，2022，44(11)：2 071–2 080.(LI Jiangshan，JIANG Wenhao，GE Shangqi，et al. Research on coupled model of consolidation and contaminant transport in compacted clay liners under non–isothermal conditions[J]. Chinese Journal of Geotechnical Engineering，2022，44(11)：2 071–2 080.(in Chinese))
[10] ZAGORS?C?AK R，SEDIGHI M，THOMAS H R. Effects of thermoosmosis on hydraulic behavior of saturated clays[J]. International Journal of Geomechanics，2017，17(3)：04016068.
[11] GIBSON R E，ENGLAND G L，HUSSEY M J L. The theory of one-dimensional consolidation of saturated clays：1. Finite non-linear consildation of thin homogeneous layers[J]. Geotechnique，1967，17(3)：261–273.
[12] THOMAS H R，HE Y. A coupled heat-moisture transfer theory for deformable unsaturated soil and its algorithmic implementation[J]. International Journal for Numerical Methods in Engineering，1997，40(18)：3 421–3 441.
[13] TSUTSUMI A，TANAKA H. Combined effects of strain rate and temperature on consolidation behavior of clayey soils[J]. Soils and Foundations，2012，52(2)：207–215.
[14] 韩 涛，李 阔，卢萌盟. 温度效应下考虑非达西渗流的大应变软土地基非线性固结分析[J]. 岩土工程学报，2026，待刊.(HAN Tao，LI Kuo，LU Mengmeng. Nonlinear consolidation analysis of large-strain soft soil foundation considering non-Darcy seepage under temperature effect[J]. Chinese Journal of Geotechnical Engineering，2026，to be pressed.(in Chinese))
[15] 邓岳保，王天园，孔纲强. 考虑温度效应的饱和土地基固结理论[J]. 岩土工程学报，2019，41(10)：1 827–1 835.(DENG Yuebao, WANG Tianyuan，KONG Gangqiang. Consolidation theory for saturated ground considering temperature effects[J]. Chinese Journal of Geotechnical Engineering，2019，41(10)： 1 827–1 835.(in Chinese))
[16] HU A F，XIA C Q，CUI J，et al. Nonlinear consolidation analysis of natural structured clays under time-dependent loading[J]. International Journal of Geomechanics，2018，18(2)：04017140.
[17] 张志红，师玉敏，朱 敏. 黏土垫层水力–力学–化学耦合模型研究[J]. 岩土工程学报，2016，38(7)：1 283–1 290.(ZHANG Zhihong，SHI Yumin，ZHU Min. Coupled hydro-mechanical-chemical model for clay liner[J]. Chinese Journal of Geotechnical Engineering，2016，38(7)：1 283–1 290.(in Chinese))
[18] CHO W J，LEE J O，CHUN K S. The temperature effects on hydraulic conductivity of compacted bentonite[J]. Applied Clay Science，1999，14(1/3)：47–58.
[19] WU C F，LI M X，WANG P，et al. Coupled model for one–dimensional large-strain nonlinear consolidation and contaminant transport in underlying clay liner of a dredged sludge dumping site considering different initial effective stress distributions[J]. Science of The Total Environment，2025，963：178539.
[20] PENG M Q，FENG S J，CHEN H X，et al. Analytical model for organic contaminant transport through GMB/CCL composite liner with finite thickness considering adsorption，diffusion and thermodiffusion[J] Waste Management，2021，120(9)：448–458.
[21] PENG M Q，FENG S J，CHEN H X，et al. An analytical solution for organic pollutant diffusion in a triple-layer composite liner considering the coupling influence of thermal diffusion[J]. Computers and Geotechnics，2021，137：104283.
[22] XIE H J，CHEN Y M，THOMAS H R，et al. Contaminant transport in the sub-surface soil of an uncontrolled landfill site in China：site investigation and two-dimensional numerical analysis[J]. Environmental Science and Pollution Research，2016，23(3)： 2 566–2 575.
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2026, Vol. 45 
