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http://dx.doi.org/10.7843/kgs.2007.23.1.23

End Bearing Capacity of Pile Tip-enlarged PHC Piles in Weathered Rock  

Yoo, Chung-Sik (Dept. of Civil & Environ. Engrg., Sungkyunkwan Univ.)
Heo, Kab-Soo (Research Institute, Kukdong Corporation)
Song, Ki-Yong (EXT Korea Co., Ltd.)
Kim, Sun-Bin (Dept. of Civil & Environ. Engrg., Sungkyunkwan Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.23, no.1, 2007 , pp. 23-37 More about this Journal
Abstract
Recently a concept of pile-tip enlarged PHC pile (Ext-PHC pile), for use in the auger-drilled construction method, has been developed and is being implemented in practice. A series of field axial load tests on both PHC and Ext-PHC piles were conducted at an experimental site. In addition, a parametric study on a number of influencing factors was made using a validated finite element model. The field axial load tests indicated an enhanced load-settlement characteristics for the Ext-PHC piles compared with the PHC piles, giving approximately 50% increase in the end bearing capacity. Also found in the results of the parametric study was that the increase in the end bearing capacity of Ext-PHC piles slightly varies with the mechanical properties of supporting ground as well as pile length, in the range of 1.25 to 1.4 time that of PHC. Overall, the results of the field tests as well as the numerical study confirmed that the end bearing capacity of PHC pile can be improved by the concept of.Ext-PHC pile.
Keywords
Auger-drilled pile; Axial load test; End bearing capacity; Finite element analysis; PHC pile;
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