Driven piles refusal,embedment and reinforced tips?
Driven piles refusal,embedment and reinforced tips?
(OP)
Looking for general rule on refusal with driven H piles into bedrock (Shale). This is a road bridge project. The site has 30 to 40 feet of soft clays over shale which has 50 blows for 4 inches about 3 to 5 feet into the shale. Have seen 10 to 15 blows for an inch for refusal. Is a minimum embedment into bedrock typically given or is it totally controlled by refusal? We are looking at 10 feet. When are reinforced tips usually recommended?





RE: Driven piles refusal,embedment and reinforced tips?
I doubt you will be able to drive the piles 10 feet into the shale. Minimum penetrations are often given, but that does not mean that you can drive the piles that far.
RE: Driven piles refusal,embedment and reinforced tips?
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RE: Driven piles refusal,embedment and reinforced tips?
I've had a few tests done by puling piles done each way. I'd have more confidence in those with tips here.
I'd have to guess that scour here will never reach the rock, so lateral support for the piles is not a question for this site. Then, why any embedment requirement?
RE: Driven piles refusal,embedment and reinforced tips?