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- W1996658185 abstract "Permeability tests and observation of induced, as well as inherent, cracks have been carried out to quantitatively explain permeability changes in granite taking place during a weathering test in terms of micro-structure by cracks. To this end, permeability tensors were estimated from observations of crack systems using the Replica Method and of the crack apertures with a scanning electron microscope. The following conclusions were reached: the drastic increase in permeability around an immersion of 1000 d in 90°C water could not be explained by the existence of a percolation threshold because all the specimens were percolative in the sense that the traces of crack tensor were above the critical density for percolation. On the other hand, SEM observation revealed that, with immersion, crack apertures widened and their distribution spread. Permeability estimated using the third (not the first) moment of observed apertures showed the increase in measured permeability well. When evaluating the connectivity parameter λ to give a quantitative accordance between measured and estimated permeability, it had a constant value as low as 0.17, irrespective of the immersion period, in spite of the higher density of micro-cracks than the percolation threshold. It can be said that, in considering the natural three-dimensional crack system, the third moment of physical apertures plays a more important role in predicting the permeability and λ is greatly affected by the spread of crack apertures." @default.
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- W1996658185 date "1998-10-01" @default.
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- W1996658185 title "Permeability changes in granite with crack growth during immersion in hot water" @default.
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- W1996658185 doi "https://doi.org/10.1016/s0148-9062(98)00016-3" @default.
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