Shear Load Transfer Characteristics of Drilled Shafts Socketed in Rocks |
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Authors: | Sangseom Jeong Sangyong Ahn Hoonil Seol |
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Institution: | (1) Department of Civil Engineering, Yonsei University, Seoul, 120-749, Korea;(2) Department of Railway and Mass Transit, Daewoo Engineering, Seongnam, 463-825, Korea |
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Abstract: | This paper presents a shear load transfer function and an analytical method for estimating the load transfer characteristics
of rock-socketed drilled shafts subjected to axial loads. A shear load transfer (f–w) function of rock-socketed drilled shafts is proposed based on the constant normal stiffness (CNS) direct shear tests. It
is presented in terms of the borehole roughness and the geological strength index (GSI) so that the structural discontinuities
and the surface conditions of the rock mass can be considered. An analytical method that takes into account the coupled soil
resistance effects is proposed using a modified Mindlin’s point load solution. Through comparisons with load test results,
the proposed methodology is in good agreement with the general trend observed in in situ measurements and represents an improvement
in the prediction of the shear behavior of rock-socketed drilled shafts. |
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