EVALUATION OF THE ORIGINALLY PUBLISHED, MEYERHOF EMPIRICAL CORRELATIONS OF SHAFT FRICTION AND END BEARING CAPACITY FOR DRIVEN PILES USING DYNAMIC TEST DATA
In 1976, Prof. G. G. Meyerhof published a famous article in the Journal of Geotechnical Engineering titled "Bearing Capacity and Settlement of Pile Foundations". This article presents the authors opinions on calculating pile capacities in clays and sands, group capacities and pile settlement. A portion of the article presents correlations of shaft friction and end bearing to the Standard Penetration Test (SPT) N-value. Subsurface exploration via the Standard Penetration Test is the most widely used exploration tool in the United States, so- correlations of pile capacity to N-value are significant to the practice of geotechnical engineering. Meyerhof s SPT-N correlations are relatively simple calculations compared to other pile capacity computation methods presented in the article or found in other text books (such as the a-method, b-method, Nordlund, Vesic, Meyerhofs semi empirical, others) and therefore are popular amongst practicing geotechnical engineers. At the time these correlations were published by Prof. Meyerhof, utilization of dynamic testing with the Pile Driving Analyzer (PDA) was not widespread in geotechnical engineering practice. Prof. Meyerhof's correlations appear to be based upon conventional static pile load testing of instrumented piles. Dynamic pile measurements to estimate a pile's static capacity provides certain advantages over conventional static load testing, namely the determination of unit shaft friction values at discrete intervals along the pile, and the unit end bearing support value.
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