Relation Between Permeability and Void Ratio for Compacted Bentonite

4 Relation Between Permeability and Void Ratio for Compacted Bentonite 

We use a model for a pure smectitic bentonite, Kunipia-F , which is compacted initially to a dry density of 1.4 Mg/m. The material properties of this bentonite are 

We assume that there is no external water when the dry density exceeds 1.6Mg/m. We consider a unit cell in the two scale HA, which involves a stack of clay minerals as shown in Fig. 10.5. Note that the following analysis is due to Theramast (2003). 

Assuming that the number of clay minerals involved in a stack is 10, the interlayer distance is arranged between d = 0.2 0.85 corresponding to the void ratio e = 0.2 1.2. We use the relationship between the interlayer distance and the permeability, which is obtained by the MD/HA calculation as shown in Fig. 10.6, which is given as 

Elastic coeff. [MPa] Poisson s ratio Wet density [Mg/m ] Dry density [Mg/m3] Int. frict. angle [°] 

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