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Grain Size and Permeability

Grain Size and Permeability

Grain Size and Permeability

(OP)
Anybody know better correlations between graine size distributions and coefficients of permeability?

RE: Grain Size and Permeability

I think that the best explanation/discussion that I have seen in texts available is given in Terzaghi & Peck's (with Mesri) book (1995).  Normally, most have used D10 size (and Hazan's coefficient - although that was for uniform sized medium sand).  Kenney's work at UofT suggests, if I remember right, that the D5 size might be a better fit for correlation.  Of course, there are theoretical formulas as well.  One item to keep in mind is the nature of your material.  I have seen water ponding for three days on a crushed stone base course that was compacted to 100% modified Proctor MDD - yet, less than 8% was passing the #200 sieve. Rounded grains will have higher permeability than angular grains.  But, suggest you start your look-see with TP&M.  Cheers

RE: Grain Size and Permeability

There is a design method which uses the Karman-Kozeny equation to estimate permeability of granular soil based on the gradation, estimate of void ratio, and grain angularity.  It was discussed in a paper in the ASCE Geotech. Journal a few years back and it estimated permeability much closer than the old Hazen formula.  The paper provides guidelines for void ratio based on soil classification and relative density.  I have it programmed into an excel gradation spreadsheet and it is also a good way to look at sensitivity with void ratio.

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