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Settlement Characteristics of Large Drilled Shafts Embedded in Bed Rocks  

Hong Won-Pyo (Dept. of Civil & Environ. Engrg., Chung-Ang Univ)
Yea Geu-Guwen (Vice-chief, Sambu Construction Co., Ltd)
Nam Jung-Man (College of Ocean Science, Cheju National Univ)
Lee Jae-Ho (Dept. of Civil Engrg., Chung-Ang Univ)
Publication Information
Journal of the Korean Geotechnical Society / v.21, no.5, 2005 , pp. 111-122 More about this Journal
Abstract
The data on the pile load tests performed on 35 large drilled shafts are analyzed to investigate the load-settlement characteristics of large drilled shafts embedded in bed rocks. Generally, the settlement of large drilled shafts embedded in bed rocks is too small to determine the ultimated load with application of the regulation in design code for either the total settlement or the residual settlement. Therefore, to determine the yield load of large drilled shafts embedded in bed rocks, p(load)-logS (settlement) curve method, which has been proposed originally for the driven pile, was applied to the investigation on the data of the pile load tests. This technique shows that the yield load can be determined accurately and easily rather than other conventional techniques such as P-S, logp-logS, S-logt, and P-S curve methods. An empirical equation is proposed to represent the relationship between pile load and settlement before the yield loading condition. And the settlement of piles was related with the depth embedded in rock as well as rock properties. Based on the investigation on the data of pile load tests, the resonable regulations f3r both the total settlement and the residual settlement are proposed to determine the yield load of large drilled shafts embedded in bed rocks.
Keywords
Large drilled shaft; Pile load test; Settlement; Ultimate load; Yield load;
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