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http://dx.doi.org/10.7843/kgs.2007.23.1.5

Development of an Empirical Equation for Estimating Lond Transfer Curve for Micropile in Weathered Soils  

Park, Seong-Wan (Dept. of Civil & Environment Engrg., Dankook Univ.)
Cho, Kook-Hwan (Dept. of Structural Engrg., Seoul National Univ. of Technology)
Roh, Kang-Koo (Dept. of Civil & Environment Engrg., Dankook Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.23, no.1, 2007 , pp. 5-11 More about this Journal
Abstract
Micropiles have been used for underpinning or rehabilitation of existing foundations, and direct structural support system as well. However, relatively few studies have been done on the load-transfer mechanism of micropile systems in Korea. In addition to that, only the limited information is available for estimating the side friction values on micropiles installed in weathered soils. In this study, a full-scale test on an instrumented micropile is performed in order to establish the load-transfer curves based on a hyperbolic function. Then, an empirically derived equation that correlates the load-transfer curve of micropiles with the N values from field standard penetration tests is proposed. The results from all procedures are presented in this paper. Finally, back analysis using a finite difference method and the published field data are adopted for examination of a developed skin friction equation of micropile in weathered soils respectively.
Keywords
Field test; Load transfer; Micropile; Skin friction; Weathered soils;
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