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http://dx.doi.org/10.7843/kgs.2016.32.11.61

Evaluation of Allowable Bearing Capacity of 600 mm Diameter Preboring PHC Piles Using Dynamic Load Test  

Woo, Gyu-Seong (School of Civil, Environmental and Architectural Engrg., Korea Univ.)
Park, Jong-Bae (Housing & Urban Research Institute, LHI)
Seo, Mi-Jeong (School of Civil, Environmental and Architectural Engrg., Korea Univ.)
Lee, Jong-Sub (School of Civil, Environmental and Architectural Engrg., Korea Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.32, no.11, 2016 , pp. 61-72 More about this Journal
Abstract
For the construction of high-rise structures and the optimized foundation design, the use of the large-diameter PHC pile has increased. Especially, the use of the 600 mm diameter PHC pile has significantly increased. In this study, for the evaluation of the suitability of the current design practice, the 46 dynamic pile load tests, which were carried out in the 600 mm diameter preboring PHC pile, are analyzed. The end bearing capacity is obtained from the end of initial driving test and the shaft capacity is estimated from the restrike test. The allowable capacities estimated by the dynamic load test are compared with those based on the current design practice. The analyses show that the allowable end bearing capacity evaluated by the dynamic pile load test is greater than the design practice in most piles. The allowable shaft capacity, however, is smaller than the design practice in many piles. The higher end bearing capacity and the smaller shaft capacity may result from the improvement of the drilling equipment and the increase in the penetration depth. Thus, the portion of the end bearing capacity in the total capacity increases.
Keywords
Allowable bearing capacity; Dynamic load test; End bearing capacity; Preboring piles; Safety factor; Shaft capacity;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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