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An Applicative Estimation of Safety Factors about Driven Pile Using the Results of Static Loading Test on the Ultimate State  

Ki, Wan-Seo (Department of Civil Construction Engineering, Chosun College of Science&Technology)
Park, Noh-Hwan (Kumho Engineering&Construction Co., Ltd.)
Kim, Sun-Hak (Department of Civil Engineering, Chosun University)
Publication Information
The Journal of Engineering Geology / v.19, no.4, 2009 , pp. 441-457 More about this Journal
Abstract
This study estimated ultimate load by the determination methods based on ultimate load, yield load and settlement using experimental data from static load tests that applied load to driven piles used in sandy grounds at home and overseas until failure appeared markedly. Estimated ultimate load was normalized with actually measured failure load, and was compared among the determination methods according to the characteristics of pile. In addition, I have identified to the determination methods suitable for estimating ultimate load, and reevaluated the safety factor when determining allowable load. From the results of this study were drawn conclusions as follows. Among ultimate loads estimated by the ultimate-load-based determination methods, the value interpreted by Chin's method tended to overestimate actual measurements, and B. Hansen 80% standard and the stability plot method were considered most reliable as their results were closest to actual measurements. According to the results of this study, in calculating the allowable load, if the safety factor to be applied to failing load obtained by the method of determining extreme load is converted to the safety factor applied to the Standards for Structure Foundation Design, a value larger than 3.0 should be applied except the B. Hansen 90% method, and a value larger than 2.0 should be applied in the methods of determining yield load. In addition, if the safety factor to be applied to load obtained by the settlement standard is converted based on safety factor 3.0 for extreme load, a value smaller than 3.0 should be applied to the total settlement standard and the net settlement standard.
Keywords
static load test; ultimate load; yield load; allowable load; safety factor;
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