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http://dx.doi.org/10.7843/kgs.2021.37.6.5

An Empirical Formula of Bearing Capacity on Prebored and Precast Steel Piles  

Park, Jong-Jeon (Dept. of Civil and Environment Engrg., Yonsei Univ.)
Kim, Do-Hyun (Dept. of Civil and Environmental Eng., MIT)
Jung, Gyung-Ja (Korea Expressway Corporation Research Institute)
Jeong, Sang-Seom (Dept. of Civil and Environment Engrg., Yonsei Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.37, no.6, 2021 , pp. 5-20 More about this Journal
Abstract
In this study, a modified empirical formula for estimating the bearing capacity of the steel pipe prebored and precast pile was proposed by performing 20 cases of real-scale field pile loading tests. The proposed formula will be based on expanded SPT N-value in order to consider the realistic condition of the surrounding soil. The formula is proposed based on a statistic approach of the data points from the field pile loading test, in order to ensure safe engineering practice while finding a reliable formula. The statistical analysis of the data points from the loading test indicated that the existing formula has been underestimated the bearing capacity of the prebored and precast pile. The proposed formula estimates 15% and 20% higher pile End bearing capacity (qt=230Pdriven(kN/m2)) and the shaft resistance (fmax=3.0NsE(kN/m2)) compared to the existing formula. The accuracy and the stability of the proposed formula was verified by comparing the estimated results with additional field test data. The verification process showed that the proposed formula was estimated to be more accurate than the existing formula.
Keywords
Empirical formula; End bearing capacity; Full-scale pile loading test; Shaft resistance; Steel pipe prebored and precast pile (PPP);
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