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http://dx.doi.org/10.7843/kgs.2015.31.9.39

Critical Buckling Characteristics of Micropiles Under Axial Loads  

Jeong, Hyeon-Sik (Dept. of Geotechnical Engrg., Kang-ho Eng. Co.)
No, In-Soo (Shinsegi Const. Co.)
Lee, Yeong-Seang (Dept. of Civil Engrg., Kyonggi Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.31, no.9, 2015 , pp. 39-51 More about this Journal
Abstract
various soil conditions as its application to foundation retrofit works has increased. However, most of the domestic researches focused mainly on bearing behavior of Case-I and Case-II type micropiles, whereas structural verification research was insufficient in relation with bulking behavior in particular. In this respect, this study was perfomed to understand the critical buckling characteristics of micropiles under axial load with various steel bars and grout conditions. As a result, it was found that a critical buckling shear strength of a micropile increases for smaller diameter micropile and a critical buckling load decreases with a longer length in the condition under the critical buckling length. Also, a method to evaluate a buckling possibility and yield behavior under axial compressive load conditions is proposed.
Keywords
Micropile; Buckling load; Critical buckling shear strength; p-y curve; Yield lateral displacement;
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