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http://dx.doi.org/10.7843/kgs.2020.36.7.15

Estimation of Load-Settlement Curves of Embedded Piles Combining Results of End of Initial Driving and Restrike Dynamic Pile Tests  

Seo, Mi Jeong (School of Civil, Environmental, and Architectural Engrg., Korea Univ.)
Park, Jong-Bae (Land & Housing Institute, Korea Land & Housing Corporation)
Park, Min-Chul (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.36, no.7, 2020 , pp. 15-28 More about this Journal
Abstract
As the skin friction of an embedded pile is produced by the cement paste injected into the borehole, the skin friction cannot be evaluated by the end of initial driving test, which is conducted before the cement paste is cured. In addition, the total resistance of an embedded pile may not be properly evaluated during the restrike test if the base resistance is not fully mobilized because of the insufficient driven energy. The objective of this study is to suggest a new load-settlement curve of embedded piles by combining the results of the end of initial driving and restrike tests. Test piles are installed at fields by using the embedded pile method, and the results of the dynamic pile tests are analyzed using CAse Pile Wave Analysis Program (CAPWAP) after the end of initial driving and restrike tests are conducted. A new load transfer curve, which combines the behaviors of the pile base at the end of initial driving and of the pile shaft at the restrike, is suggested, and a new load-settlement curve is obtained. Subsequently, the resistances of the test piles are evaluated using the combined load-settlement curve, and compared with the results from the end of initial driving and restrike tests. The results showed that the resistances, which are evaluated using the combined load-settlement curve, may overcome the underestimation of the resistance because of the insufficient driven energy. In addition, the resistance resulted from the combined load-settlement curve may be more similar to that from the static load test because the suggested load transfer curve is closer to the behavior of the embedded pile compared to the results of end of initial driving and restrike tests. Therefore, this study demonstrates that the combined load-settlement curve may be effectively used for the evaluation of the bearing capacity of embedded piles.
Keywords
Dynamic pile test; Embedded pile; End of initial driving test; Load-settlement curve; Load transfer analysis; Restrike tests;
Citations & Related Records
Times Cited By KSCI : 7  (Citation Analysis)
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