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http://dx.doi.org/10.7843/kgs.2015.31.1.15

Experimental Study on the Effect of Drilling Fluid with Different Mix Designs for Bore Hole Collapse Prevention  

Yoo, Chung-Sik (Dept. of Architecure & Civil Sungkyunskwan Univ.)
Choi, Jung-Hyuk (Dept. of Civil & Environmental Engrg., Sungkyunkwan Univ.)
Han, Yun-Su (Hyundai Heavy Industries Co., Ltd.)
Publication Information
Journal of the Korean Geotechnical Society / v.31, no.1, 2015 , pp. 15-24 More about this Journal
Abstract
This paper presents the results of a reduced-scale physical model investigation into the effect of drilling fluid with different mix designs for bore hole collapse prevention. The bore hole collapse prevention mechanism for the bentonite based drilling fluid was first discussed together with the effect of conditioning with different additives on engineering characteristics of bentonite based drilling fluid. Reduced-scale model tests were then carried out considering field procedures for cases with a decomposed granitic soil with 20% fines and a sand with various drilling fluids with different mix designs. The results indicated that the addition of polymer to the bentonite based drilling fluid decreases the amount of drilling fluid injected, the drilling fluid infiltration thickness and increases the final depth of excavation. Also revealed is that the effect of polymer on the performance of drilling fluid is more pronounced in the decomposed granite soil with 20% fines than the sand. Practical implications of the findings from this study are discussed in great detail.
Keywords
Drilling fluid; Reduced scale model test; Bentonite; RCD pile; Slurry wall;
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