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A thermo-hydro-mechano-chemical formulation for modeling water transport around a ventilated tunnel in an argillaceous rock

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Journal of Rock Mechanics and Geotechnical Engineering 2013年第2期5卷 145-155页

作者： Chengyuan Zhang Xiaoyan Liu Quansheng Liu Institute of Rock and Soil Mechanics Chinese Academy of Sciences College of Civil Engineering Wuhan University Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education Wuhan University

Argillaceous rocks are being considered as potential host rocks for deep geological disposal. For the research work in DECOVALEX-2011, 5 participant research teams performed simulations of a labora- tory drying test and a ventilation experiment for Mont Terri underground laboratory built in argillaceous rock formation. Our study starts with establishing a coupled thermo-hydro-mechano-chemical （THMC） processes model to simulate water transport in rock around the ventilated tunnel. Especially in this THMC formulation, a three-phase and two-constituent hydraulic model is introduced to simulate the processes which occur during tunnel ventilation, including desaturation/resaturation in the rock, phase change and air/rock interface, and to explore the Opalinus clay parameter set, It can be found that water content evolution is very sensitive to intrinsic permeability, relative permeability and capillary pressure in clay rock. Water loss from surrounding rock is sensitive to the change of permeability in clay which is induced by excavation damaged zone. Chemical solute transport in the rock near ventilation experiment tunnel is simulated based on the coupled THMC formulation. It can be estimated that chemical osmotic flow has little significance on water flow modeling. Comparisons between simulation results from 5 teams and experimental observations show good agreement. It increases the confidence in modeling and indi- cates that it is a good start for fully THMC understanding of the moisture transportation and mechanical behavior in argillaceous rock.

关键词： Nuclear waste disposal Argillaceous clay Unsaturated flow Ventilation experiment solute transport DECOVALEX

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Simulation of one-dimensional column leaching of weathered crust elution-deposited rare earth ore

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Transactions of Nonferrous Metals Society of China 2019年第3期29卷 625-633页

作者： Ping LONG Guan-shi WANG Jun TIAN Shi-li HU Si-hai LUO School of Resources and Environmental Engineering Jiangxi University of Science and Technology Ganzhou 341000 China Cooperative Innovation Center of Efficient Development and Application for Ionic Rare Earth Resources Jiangxi University of Science and Technology Ganzhou 341000 China School of Architectural and Surveying and Mapping Engineering Jiangxi University of Science and Technology Ganzhou 341000 China Institute of Applied Chemistry Jiangxi Academy of Sciences Nanchang 330029 China

The ion exchange model of the leaching process was determined via batch leaching experiments using the Kerr model, with the selectivity coefficient experimentally determined to be 12.59×10^-10 L^2/g^2. solute transport laws of ammonium ions (NH4 +) and rare earth ions (RE^3+) in column leaching were described by the convection-dispersion equation (CDE). The source and sink in the CDE were determined by the Kerr model. The CDE with strong nonlinearity was solved using the sequential non-iterative method. Compared with the breakthrough curve of RE^3+, the correlation coefficient between the simulated and experimental curves reached 0.8724. Therefore, this method can simulate the one-dimensional column leaching of weathered crust elution-deposited rare earth ore. Moreover, the effects of different concentrations of ammonium sulfate ((NH4)2SO4) solution on the leaching rate of rare earth were analyzed. The optimal concentration of the (NH4)2SO4 solution had a linear relationship with the rare earth grade.

关键词： weathered crust elution-deposited rare earth ore column leaching ion exchange solute transport

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