I'm not a geotech guy but I have a question about a project I'm involved with about the skin friction of a H-pile in clay. According to the soils report, the soil profile, from existing ground and below, would include approximately 20 feet of sand then 45 feet of clay then 25 feet of sand. The blow count in the clay layer was commented as WH. I'm utilizing the method of Vijayvergiya and Focht (1972) to determine the average unit skin resistance for this layer (See attached formula). Since the blow count is 0, would it be appropriate to utilize this formula and if not what would be the appropriate formula or would you neglect skin friction for this clay layer. Any help would be most appreciated.
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