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This has to do with boring machine and the friction involved in the drill head and drill string. I agree that with your thought on his intent may have been static vs kinetic. Thanks for your help.

I would be leary about using the Max Moment for structural design without checking it against other methods. I think you area on the right track. One way to check the length of shaft is to look at the deflection vs depth graph. Look for the point at which the line crosses the zero deflection...

I typically calculate settlement from the soils information gained to a depth of at least 2 times the width of the proposed footing. I typically have a boring that is several meters deeper than this to ensure that there isn't something terrible below. The frost depth is independent of this...

Is there a difference in frictional coefficients for sliding verses rotation? I am working on a project where I going through someone else's work and his formula's use a rotational friction coefficient and a sliding friction coefficient. Does anyone have a reference name for me to look up the...

Thank you for your comments. I ended up discussing this issue with Dr. James Long, University of Illinois. He and some graduate students wrote a paper regarding the topic. Thanks again,

I have been asked by a client to determine the change in soil strength along a metal shell pile. All the books that I have tell me that in a cohesive soil the strength is reduced during driving and will be regained and increased in some cases say a month after driving. I am being asked to...

I am putting together a building foundation report and had chosen drilled shafts but the new loads are over 900 kips and the shafts are so large in diameter that they nearly touch. FHWA and others suggest a minimum spacing of 3 diameters. Has anyone put them closer together? I need them to be...