Foundation Pier Design

[rook1]

We are currently designing a pier foundation for a certain building. We have a Pier End Beam Value of 4000 psf and a skin friction of 1000 psf. The soil report recommends a minimum depth of 8 feet for the piers. But there is water at around 8 feet deep. The soil report did not say it has included the water table in its analysis. My questions are: would the friction and end beam value change? what would be the factor of change?

Thank you very much!

 

[broekie]

Can you call the geotechnical engineer on the job and ask him? Sounds like that would be a question for him/her.

 

[denoid]

You could also try posting your question in the "Soil Mechanics" forum of eng-tips.

 

[JAE]

I would definitely call the geotechnical engineer - author of the report. They have made specific recommendations to you and if you do not follow them, then you are "on your own" as far as future liability is concerned.

They can certainly assist in clarifying any provision of their report and amend it accordingly. In fact, it is always a good idea to allow the geotechnical engineer to participate fully in the design through good communication, and follow up review of your foundation design. Also - on-site observations are a good idea for your geotech as well.

 

[Focht3]

Where is the site? Soil type / strength / conditions?



Please see FAQ731-376 for great suggestions on how to make the best use of Eng-Tips Fora. See faq158-922 for recommendations regarding the question, "How Do You Evaluate Fill Settlement Beneath Structures?"