Pile to soil shear transfer and load distribution behavior for a 3D-inch diameter test pile driven from 190 to 263 feet of penetration in stiff to hard, moderately overconsolidated (OCR = 2-3) silty clay are presented. Measured shear transfer vs. displacement (t-z) curves are compared to t~ose predicted using the methods of Vij~yvergiya (1977) and Kraft, Ray and Kagawa (1981).Effects of degradation during cyclic one-way tension and two-way tension-compression on both load distribution and shear transfer behavior are presented. Degradation effects were minimal for the one-way loading and substantial for the two-way loading. Rate of loading effects on shear transfer are also presented.The measured static and cyclic pile behavior was modeled using the PSAS pile3soil interaction algorithm in INTRA (Bea et al, 1984). The pile was modeled as a series of beam elements. Non-linear hysteretic springs and dashpots were used to model the soil.When elasto-plastic soil support curves were used in conjunction with the Unconsolidated-Undrained Triaxial (UU) Strengths from driven sample~and the recommended design method of API-RP2A (1986), INTRA underpredicted the long term static pile capacity. Using the measured t-z curves, the measured pile-top load deflection behavior under both static and cyclic loading was successfully modeled.
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