I'm not a geotech guy by trade... so I wouldn't defer to me! Still, it's the discussion that's valuable so this is all good.While I will defer to IlPadrino (thank you for your comments) in Coduto's book (Geotechnincal Enginnering - Principles and Practices) he states that ". . .consolidation can only occur as some of the water is squeezed out of the voids." (page 372, 2nd paragraph). Does this not infer that the water (and the water pressure) cannot be included in the calculations?
Also, my answer (25") includes the different in the the dry effective soil pressure effective and the saturated soil pressure (92.89 - 58.36) .
Ask yourself this: all other things being equal except for a changing water table, which case would have a greater vertical stress... the initial case with a higher water table or the final case with a lower water table?Lowering the water table to 12'. I'm still not getting this part of it. I know that by lowering the water table, as the clay is consolidating, the effective stress is changing. I guess I just need to accept, if, on the exam there is a problem like this, that you have to add back in the pressure from the water...unless someone can further try to help me understand this.
You're welcome... working hard now to understand what's happening in the problem will pay big dividends when exam time comes!YES! I get it, I get it!! I understand...I think you said it in a previous post, that you took out the water pressure initially, so you have to add it back in!! All it took was a week to get this problem...should be no problem now on the exam! (Wish I had a week to take the exam!) Thank you so much!!
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