NCEES Geotechnical ultimate pullout resistance & Peck earth pressure diagram

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icreep

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Questions regarding book "PE Civil: Geotechnical Sample Questions and Solutions" (April 2013 2nd printing)

Question 528. What is the source for the formula used in the solution, P = 2*L*sigma_v*C_i*tan(phi)?

Question 529. Where did the equation sigma_a come from?

Please see picture URL for clarification.

http://imageupper.com/g/?S020001001F13822470112424190

Thank you for your help.

 
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