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PEinc, When evaluating a pile hammer NYDOT usually likes to see the blow counts between 20 BPF and 120 BPF for rated resistance (Skin Friction) pile. Also, the capacity blow count is recommended to be sustained for 1.5 feet. For a practical refusal (end bearing) pile, we recommend a blow...

QShake Thank you for your response. Could you tell me who is the author of Seismic Design of Highway Bridge Foundations, Volumes 1-3? Thanks again

I am a geotechnical engineer responsible of the foundation design of a multispan structure. Part of my responsiblilties include provide a foundation stiffness matrices. This would be my job utilizing foundation stiffness matrices. Can anyone with experience in this area recommend a method or...

I am designing the foundation for a 9 span structure, where I am required to provide foundation stiffness matrices for each pier. This is my first job utilizing foundation stiffness matrices. I am looking for a recommended method or reference to complete foundation stiffness matrices, from...

Thanks you for the assistance. SlideRule, What soil type was at the site where you drove steel h-piles 2 feet from utilities? Thanks again

I was wondering does anyone have some general rules of thumb for the distance required when driving sheeting or piles next to utilities in different soil conditions? Example: 15 feet in loose sands, 10 feet in compact sands, etc. I have a job where driven sheeting was design (by others)13 feet...

I recommend you do a building condition survey (video tape), before you drive piles next to buildings. It amazing how every tiny crack in a building can become your fault after driving piles, whether the cracks were caused by pile driving or not. I know it doesn't answer your question, but...

I have talked to engineers from Caltrans about this topic. It is my understanding that two of the reasons they would rather use larger diameter shafts/piles instead of batered piles are the following: 1. Battered piles are too rigid in the laterial resistance. This restricts lateral...