The site I am working on has layered strata with stiff to very stiff clay in the upper say 35 ft followed by medium dense to dense sand between 35 ft to 45 ft followed by very stiff clay to a depth of 65 ft followed by medium to dense sand to 100 ft. The client wants to utilize driven square concrete pile and tip the pile at 40 ft depth below grade in to the intermediate sand layer and utilize capacity in skin friction as well as end bearing.
My question is what should be the minimum thickness of sand layer below the pile tip to count on the end bearing capacity in sand?
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