報告 Sample Recovery Ratios and Sampler Penetration Resistance in Tube Sampling for Niigata Sand

概要

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In this paper, sample recovery ratios, fluid pressure and sampler penetration resistance in tube sampling are discussed. The samplers were taken by two types of hydraulic piston samplers, one a two-chambered sampler with inner diameters of 45 mm and 50 mm, and the second a one-chambered sampler having a 70 mm diameter. The second type is the one commonly used in Japan and which was also used at the Meike Elementary School, the JGS-1989 investigation site. These samplers are here after referred to as the 45D, 50D and 70S samplers. The mean value of the sample recovery ratios from the 45D and 50D samplers was 93% greater than that of the 70S sampler. This value remained independent of the sands having N= 3〜54 from the standard penetration test. Guidelines for estimating the pump fluid pressure for tube sampling of sand, sampler and drilling equipment penetration resistance forces and the relationship between the sample recovery ratios and the drilling mud densities, etc., were established for Niigata sand. The end results contribute to a safer and more reliable sampling method.
社団法人地盤工学会の論文
2002-10-15