An approach based on two-phase flow phenomenon for modeling gas migration in saturated compacted bentonite
作者： W.M. Ye , L. Xu , B. Chen , Y.G. Chen , B. Ye
DOI: 10.1016/J.ENGGEO.2013.12.001
关键词:
摘要: In deep geological repositories for spent fuel and high-level radioactive waste (SF/HLW), a great deal of gas will be produced by anaerobic corrosion metals, radiolysis water microbial degradation organic materials. Due to the extremely low permeability saturated compacted bentonite, accumulate in space bentonite around canister, resulting generation high pressure nearby canister. Migration engineered barrier system can divided into four phases according level: advection diffusion dissolved gas, visco-capillary two-phase flow, dilatancy-controlled flow along macroscopic tensile fractures. Based on characteristics (i.e., migrates discretely distributed pathways is influenced stress state) modified dependent method from literatures, approach with consideration state was established. With this approach, calculated results were improved, while it cannot describe discrete distribution pathways. Therefore, further modification heterogeneity proposed. On basis existing experimental under different boundary conditions, verification comparison evolutions fluxes degree saturation conducted. Results show that proposed article effectively simulate performance evolution during phases.
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