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http://dx.doi.org/10.7843/kgs.2011.27.6.005

A Case Study of Post-Grouted Drilled Shaft in Weathered Rock  

Kwon, Oh-Sung (Technology Research institute, Daelim Industrial Co., Ltd.)
Jung, Sung-Min (Deputy General Manager, G-tec Ltd.)
Choi, Yong-Kyu (Dept. of Civil & Environmental Engrg,. Kyungsung Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.27, no.6, 2011 , pp. 5-16 More about this Journal
Abstract
Post-grouting for the drilled shaft is known to remarkably increase the end bearing capacity of pile by consolidating and reinforcing the disturbed ground containing slime around the pile tip. However, the general design guideline for post-grouting has not been established yet in Korea. Especially in the domestic application, the post-grouting is employed just for repairing the pile with unacceptable resistance rather than for increasing the design resistance of pile. Therefore, little is reported about the effect of post-grouting on the pile resistance itself. In this study, the effect of post-grouting on the resistance of drilled shafts installed in the weathered rock in Korea was estimated by performing the bi-directional load tests on the piles with and without the post-grouting. The test results presented that the initial slope of end bearing-base displacement curve in the pile with post-grouting was 4 times higher than that without post-grouting. At the acceptable settlement (1% of pile diameter), the end bearing capacities of piles with and without the post-grouting were estimated to be 12.0 MPa and 7.0 MPa, respectively, which indicate that the post-grouting could increase the end bearing resistance of pile in weathered rock more than 70%.
Keywords
Drilled shaft; End bearing capacity; Post grouting; Tube-a-manchette; Weathered rock;
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