DF22Steel H PliesEndBearing:Figure 9isa plot of mobilized unit end bearing versus blowcount for the foursoil types. The empirical equations for the four soil types are presented as follows:Soil TypeDescriptionMobilized Unit End Bearing Capacity (TSF)1Plastic clava=O.7N/32Clay·silt·sandmixtures, very siltyq=1.6N/3sand, silts and marls3Clean sandsQ=3.2N/34Soft limestone, veryq=3.6N/3shelly sandThe methodology used to calculate the end bearing capacity for a given depth is the sameas the concrete pile. This includes the critical depth correction, the end bearing contributionzone of 8B above and 3.5B below the pile tip and the bearing averaging technique remainthe same as for concrete piles.SideFriction:Figure 10 is a plot of ultimate unit side friction versus blowcount for the foursoil types. The empirical equations derived from the database are as follows:Soil TypeDescriptionUltimate Unit Side Friction (TSF)
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