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  1. rj_geo

    Permeability of clean sand vs density

    Ok.. not sure what exactly a half order of magnitude is defined as. I took it as 10^0.5 = 3.16. Nearly 300% increase or 30% decrease. I loosely said half order of magnitude, but was using 20% decrease. Sorry for not being too specific. Thanks.
  2. rj_geo

    Permeability of clean sand vs density

    Thank you for the replies all. I understand the difference is going to be small. But that's what the questions is. Has there been any study to show the difference will and can exist. Is it reasonable to assume the permeability of denser layer to be 1*10-3 as compared to 5*10-3 of loose (less...
  3. rj_geo

    Permeability of clean sand vs density

    It does depend on D10 (and may on D5) and percent fines, yes. But they do have same grain size (D10 ~ 0.15mm)and %fines (5 to 7%)
  4. rj_geo

    Permeability of clean sand vs density

    I think the question is- Is it safe to assume the permeability of denser layer to be half order magnitude lower(one-fifth) than the layer above ? any literature or source to support that? any available data or experience with results that it's not unrealistic variation?
  5. rj_geo

    Permeability of clean sand vs density

    I’d think the void ratio would be lower in the dense sands and the permeability can be lower. I believe Slichter chart also indicates the same thing? Basically there are two sand layers with significant increase in blow counts in the lower layer hinting towards a geologic change. Trying to see...
  6. rj_geo

    Permeability of clean sand vs density

    Is there a way to see the relative difference in the permeability of clean sand for loose sand (N = 5 to 10) and for very dense sand (N > 60) Basically there are two sand layers with significant increase in blow counts in the lower layer hinting towards a geologic change. Trying to see if there...

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