On the Study of Pile Driving Formula Based on Blow Counts |
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| Authors: | Email author" target="_blank">M?M?AliEmail author M?R?Selamat S?S?Yii W?K?Ng |
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| Institution: | (1) Department of Civil Engineering, Jubail University College, Jubail Industrial City-31961, Kingdom of Saudi Arabia;(2) School of Civil Engineering, University Science Malaysia, 14300 Nibong Tebal, P. Pinang, Malaysia |
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| Abstract: | Accuracy of predicting pile capacities by pile driving formulas have been investigated. Five test piles were driven up to
a depth of about 9 m of clay deposit and the penetrations due to final blows were recorded. The pile bearing capacity of each
pile was predicted using 6 different pile driving formulas and the predicted pile capacity was compared with measured pile
capacity from the pull up tests. Hiley formula, Modified Engineering News Record (ENR) formula, Janbu formula, Dutch formula,
Danish formula, and Gates formula were used. The performance and accuracy of each formula was evaluated and the correlation
coefficient of each pile driving formula was determined for a more accurate pile capacity prediction. Methods used to evaluate
the performance of each formula were; (1) the best fit line for Q
p versus Q
m (2) cumulative probability for Q
p/Q
m and (3) the arithmetic mean and standard deviation for Q
p/Q
m. From the study, it was found that using Dutch formula provided the most accurate pile capacity estimate compared to the
other formulas with an average of 7% deviation from value obtained from the field pull up test. It was followed by the Danish
formula, Janbu formula, Hiley formula, Modified ENR formula, and Gates formula. The ability to predict the accuracy of estimating
pile capacity using an appropriate method is very important and valuable to contractors, developers, geotechnical engineers,
and manufacturers. |
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