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Fellenius Neutral Plane Method (Downdrag)

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ghgeo

Geotechnical
Feb 10, 2009
7
I am uncertain about how to construct the "resistance curve" in Fellenius's method for determining the location of a the neutral plane for piles subjected to downdrag (see attached).

At point A, the value is Rt + Sum of RS from A to B. At point B, the value is Rt. How do you draw the curve from point A to point B? At point C, is the value equal to Rt + Sum of RS from A to B - Sum of RS from A to C?

I hope this make sense. Let me know if you need more info, etc. Thank you!
 
 http://files.engineering.com/getfile.aspx?folder=8d241aea-8f52-48b3-ae6d-ad6320805ba8&file=Fellenius_Neutral_Plane_Method.jpg
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