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《Chinese Journal of Underground Space and Engineering》 2014-05
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Discrete Element Modeling of Coupled Mechanical-Flow-Transport Processes in Fractured Rocks

Zhao Zhihong;Jing Lanru;Song Erxiang;Department of Civil Engineering,Tsinghua University;Division of Land and Water Resources Engineering,Royal Institute of Technology;  
Deep underground projects,such as enhanced geothermal system,underground nuclear waste repository,CO2 sequestration and underground coal gasification etc,involve complex coupled hydro-mechanical-chemical(HMC)processes. A solid understanding of stress effects on solute(e. g. radioactive nuclide)transport in fractured rocks is critical for design,construction,operation and performance /safety assessments of the above projects. A hybrid framework combining discrete element method for stress-flow processes and particle tracking method for solute transport is presented. The solute transport mechanisms including advection,hydrodynamic dispersion and matrix diffusion are considered. The results show that the stress can significantly influence transport process,in terms of residence time,transport path and distribution. When the hydraulic gradient is low,matrix diffusion plays a key role in solute transport through fractured rocks.
【Fund】: 国家自然科学基金资助项目(41272279)
【CateGory Index】: TU45
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