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http://dx.doi.org/10.7843/kgs.2010.26.9.71

Development of Static Rock Penetrometer for Locating Rock Stratum During Construction of Drilled Shafts  

Nam, Moon-S. (Expressway & Transportation Research Institute, Korea Expressway Corp.)
Publication Information
Journal of the Korean Geotechnical Society / v.26, no.9, 2010 , pp. 71-74 More about this Journal
Abstract
During construction of deep foundation in soft rock under varying soil properties, it is essential to locate the rock stratum, especially when drilling with slurry. When slurry is used for drilling, the bottom of the borehole cannot be seen, thereafter soil cuttings cannot be differentiated from soft rock cuttings. A new static rock penetrometer, known as Rock Penetrometer was developed during this study. It could be a simple mechanical device that is attached to the bottom of a Kelly bar which is used to attach drilling tools such as augers and core barrels while drilling. After its calibration in the laboratory, the performance of the static rock penetrometer was verified in the several field test sites.
Keywords
Drilled shafts; Slurry; Field verification tests; Rock; Static rock penetrometer;
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  • Reference
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2 Nam, M. S. (2004), "Improved Design for Drilled Shafts in Rock", Ph. D. Dissertation, Department of Civil & Environmental Engineering, University of Houston, Houston, Texas.