In large-strain consolidation testing, hydraulic conductivity is increasing while an additional load is applied on soft soil sample? Could anyone suggest me what are the possible reasons of it? Thanks much.
DEAR ISLAM
The link below has a very good information for you.
book is :
Compressibility of Ultra-Soft Soil by Myint Win Bo
World Scientific Publishing Company, 17-Apr-2008 - Technology & Engineering - 332 pages
https://books.google.co.in/books?id=xEI8DQAAQBAJ&pg=PA97&lpg=PA97&dq=Why+hydraulic+conductivity+increases+by+application+of+a+new+load+on+soft+soil&source=bl&ots=VpnLg9pCmy&sig=6ZOvxYPR5tw5bDgNuRc5ZsYvn_g&hl=en&sa=X&ved=0ahUKEwjLt_WGwbjYAhWKqY8KHfA4A4cQ6AEILzAC#v=onepage&q=Why%20hydraulic%20conductivity%20increases%20by%20application%20of%20a%20new%20load%20on%20soft%20soil&f=true
Another good link is:
http://onlinelibrary.wiley.com/doi/10.1029/2002WR001324/pdf
Dear Shriful Islam ,
may be this paper could help you: https://link.springer.com/content/pdf/10.1007/s41062-017-0060-0.pdf
More information is required. What's the sample dimension? What's the load increment? Did you estimate ks from T_90? Such calculations are not valid for your tests as the T_90 approach is based on Terzaghi's 1D consolidation theory. It is valid for thin and small specimen (typically 2 cm thick and 6 cm diameter).
http://www.abc.net.au/science/articles/2013/10/14/3868363.htm
Maybe a barefoot walk on a saturated beach (with the sand drying out around your feet) can give you inspiration...
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