Proceedings of the Korean Geotechical Society Conference (한국지반공학회:학술대회논문집)
- 2005.03a
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- Pages.603-610
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- 2005
End Bearing Behavior of Drilled Shafts in Rock
암반에 근입된 현장타설말뚝의 선단지지거동
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Kwon, Oh-Sung
(Technology Research Institute, Daelim Industrial Co., Ltd.)
;
- Kim, Kyung-Taek (Technology Research Institute, Daelim Industrial Co., Ltd.) ;
- Lee, Young-Chul (Technology Research Institute, Daelim Industrial Co., Ltd.) ;
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Kim, Myoung-Mo
(Dept. of Civil, Urban and Geosystem Engineering, Seoul National University.)
- Published : 2005.03.25
Abstract
The end bearing behavior of piles socketed in weathered/soft rock is generally dependent upon the mass conditions of rock with fractures rather than the strength of intact rock. However, there are few available data and little guidance in the prediction of the end bearing capacity of drilled shafts socketed in weathered/soft rock, considering rock mass weathering. Therefore, a database of 13 load tests was constructed first, and new empirical relationships between the base reaction modulus of piles in rock and rock mass properties were developed. No correlation was found between the compressive strengths of intact rock and the base reaction modulus of weathered/soft rock. The ground investigation data regarding the rock mass conditions(e.g. Em, Eur, RMR, RQD) was found to be highly correlated with the base reaction modulus, showing the coefficients of correlation greather than 0.7 in most cases. Additionally, the applicability of existing methods for the end bearing capacity of piles in rock was verified by comparison with the field test data.
Keywords
- rock socketed pile;
- base reaction modulus;
- end bearing capacity;
- pile load test;
- weathered/soft rock