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http://dx.doi.org/10.7843/kgs.2009.25.8.77

End Bearing Load Transfer Behavior of Rock Socketed Drilled Shafts  

Cho, Hoo-Yeon (Dept. of Civil Engrg., Yonsei Univ.)
Jung, Sang-Sum (Dept. of Civil Engrg., Yonsei Univ)
Seol, Hoon-Il (Dept. of Civil Engrg., Yonsei. Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.25, no.8, 2009 , pp. 77-93 More about this Journal
Abstract
The load distribution and deformation of rock socketed drilled shafts subjected to axial loads were evaluated by a load transfer approach. The emphasis was laid on quantifying the end bearing load transfer characteristics of rock socketed drilled shafts based on 3D Finite Difference (FD) analysis performed under varying rock strength and rock mass conditions. From the results of FD analysis, it was found that the ultimate unit toe resistance ($q_{max}$) was influenced by both rock strength and rock mass conditions, while the initial tangent of end bearing load transfer curve ($G_{ini}$) was only dependent on rock strength. End bearing load transfer function of drilled shafts socketed in rock was proposed based on the FD analysis and the field loading tests which were performed on weathered rock in South Korea. Through the comparison with the results of the field loading tests, it is found that the load transfer curve by the present study is in good agreement with the general trend observed by field loading tests, and thus represents a significant improvement in the prediction of load transfer behavior of drilled shaft.
Keywords
Drilled shaft; End bearing; FD analysis; Field loading test; $G_{ini}$; Load transfer; Rock interface; $q_{max}$;
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