Influence of Sample Disturbance on Estimated Side Resistance of Driven Piles in Cohesive Soils
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Volume 142, Issue 10
Abstract
This paper describes the influence of sample disturbance on laboratory undrained shear strength tests used for pile capacity calculations of driven close-end pipe piles, referencing an approach based on the stress history and normalized soil engineering properties (SHANSEP) for estimating the side resistance of pipe piles in cohesive soils. The SHANSEP technique provides a rational basis for relating the soil overconsolidation ratio (OCR) to the normalized side resistance overcoming the problems related to sample disturbance. Sample disturbance of soils with is identified as a significant factor affecting the selection of values of side resistance for pile design. The empirical record of load test sites was modified to remove test data that were likely affected by sample disturbance effects from the current database referencing the SHANSEP-based approach to provide a reliable set of reference undrained strengths and measured side resistance values, which produces an equivalent new undrained (alpha) format with limited sample disturbance effects. This equivalent alpha approach is then related to current alpha methods showing the effects of sample disturbance on the undrained strength values, corresponding alpha values, and corresponding calculated pipe pile side resistance capacity. Data with less disturbance effects and subsequently higher undrained strength are shown to result in lower alpha values as compared to current values. Improved methods of sampling and testing, the use of in situ tests to determine undrained strengths without disturbance effects, and calculated undrained strengths developed from oedometer tests need an alpha format matching the improved site characterization or the calculated pile capacity could be overestimated using the better samples and better site characterization.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 142 • Issue 10 • October 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Feb 19, 2015
Accepted: Feb 11, 2016
Published online: May 19, 2016
Published in print: Oct 1, 2016
Discussion open until: Oct 19, 2016
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