Assessing Adhesion of Driven Pipe Piles in Clay Using Adaptation of Stress History and Normalized Soil Engineering Parameter Concept

This paper presents a method to estimate the side resistance of a driven displacement-pipe pile in clay using the stress history and normalized soil engineering parameter (SHANSEP) concept. The side resistance is treated as an adhesion, and this adhesion is normalized to the effective overburden stress. This normalized adhesion is then related to the soil overconsolidation ratio using an adaptation of the SHANSEP concept to separate the normally consolidated behavior from the overconsolidated behavior. This approach provides a rational means of screening representative measurements of undrained shear strength from measurements that may have been affected by sample disturbance. Assessments of the soil overconsolidation ratio are developed with laboratory odometer test data and an empirical approach using laboratory undrained strength data. A database of pile load tests screened for the effects of incomplete set-up and soil-property data screened for the effects of sample disturbance is used to evaluate the normalized side resistance and the relationship of normalized side resistance to overconsolidation ratio.

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