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http://dx.doi.org/10.7843/kgs.2009.25.7.5

Expansion Ratio and Ultimate Load of Pulse-Discharge Bulbed Anchors  

Kim, Nak-Kyung (Dept. of Civil Engrg., Sungkyunkwan Univ.)
Kim, Sung-Kyu (Dept. of Civil Engrg., Sungkyunkwan Univ.)
Joo, Yong-Sun (Dept. of Civil Engrg., Sungkyunkwan Univ.)
Seo, Hyo-Kyun (Dept. of Civil Engrg., Sungkyunkwan Univ.)
Kim, Sun-Ju (Daewoo Research Institute of Technology)
Publication Information
Journal of the Korean Geotechnical Society / v.25, no.7, 2009 , pp. 5-10 More about this Journal
Abstract
The ground anchor is not usually used in soft clay and loose sand, because the pullout resistance of anchors can not be guaranteed. However, there is a method to increase the capacity of anchors using electric discharge geotechnical technologies, which are also known as pulse discharge and electric-spark technologies. The pulse-discharge anchor has a bulbed (or underreamed) bond length that is expanded by high voltage electrokinetic pulse energy. 24 anchors were installed in the weathered soil and sandy clay at the Geotechnical Experimentation Site at Sungkyunkwan University in Suwon, Korea. In this study, in order to define a relation between expansion rate of the anchor diameter and ultimate load, anchor load tests were carried out in accordance with testing procedures by AASHTO (AASHTO 1990) and FHWA (Weatheb 1998). And then several anchors were exhumed to measure the diameter of the pulse discharge anchors.
Keywords
Bulbed anchor; Electric discharge; Expansion Ratio; Field test; Pullout load test; Pulse discharge; Ultimate load; Underreamed anchor;
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