Large-strain numerical solution for coupled self-weight consolidation and contaminant transport considering nonlinear compressibility and permeability |
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| Affiliation: | 1. Department of Civil Engineering and Architecture, Saga University, Japan;2. College of Architecture and Civil Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, China;3. Department of Civil and Environmental Engineering, College of Engineering, Shantou University, Shantou, Guangdong 515063, China;1. Institute of Geotechnical and Underground Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China;2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China;3. School of Engineering and Applied Science, University of Virginia, Charlottesville, VA 22903, United States;1. Department of Mechanical, Aerospace and Civil Engineering, School of Engineering, The University of Manchester, Manchester M13 9PL, UK;2. Center for Balance Architecture, Zhejiang University, 148 Tianmushan Road, Hanghzou 310007, China;3. Institute of Hydrology and Water Resources Engineering, Zhejiang University, Hangzhou 310058, China;4. Ocean College, Zhejiang University, Zheda Road, Zhoushan 316021, China;5. College of Hydraulic Engineering and Architecture, Tarim University, Alaer 843300, China |
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| Abstract: | Based on the one-dimensional (1D) consolidation equation and advection-dispersion transport equation, this paper presents a large-strain numerical solution for coupled self-weight consolidation and contaminant transport in saturated deforming porous media considering nonlinear compressibility and permeability relationships. The finite difference method is used to solve the governing equations for consolidation and transport. The proposed numerical solution for consolidation accounts for vertical strain, soil self-weight, and nonlinearly changing compressibility and hydraulic conductivity during consolidation. The solution for solute transport accounts for advection, diffusion, mechanical dispersion, linear and nonlinear equilibrium sorption, and porosity-dependent effective diffusion coefficient. The proposed numerical solution is verified against a self-weight consolidation field tank test, an analytical solution in the literature, and the CST1 numerical model. Using the verified solution, a series of parametric study is conducted to investigate the effect of several important parameters on the contaminant transport process for confined disposal of dredged contaminated sediments. The results indicate that the consolidation process and contaminant transport process induced by soil self-weight- can be very different from those induced by the more traditional external surcharge loading. Treating the self-weight loading as traditional external surcharge loading can underestimate the rate of contaminant outflow, especially in the early times. The compressibility and permeability relationships of sediment and the type of loading (i.e., self-weight loading versus external surcharge loading) can all significantly affect the contaminant transport process for confined disposal of dredged contaminated sediment. |
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