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[2C01-06-01] Analytical Modeling of Bentonite Extrusion of Crack in Rock Fracture
Keywords:Extruding fluid, Trapped fluid absorption, Closed-end crack, Geological disposal, Bentonite
The prediction of the bentonite extrusion of the crack in rock fracture is necessary to evaluate the performance of the natural barrier system for high level radioactive waste disposal. This study presents the analytical model for predicting the bentonite extrusion of closed-end crack considering the swelling behavior of the bentonite. The analytical results obtained suggest that the bentonite extrusion depends on the external swelling pressure in the initial stage of the extrusion process, and then the bentonite fills the crack over a long period owing to the absorption of trapped fluid in it into the bentonite.