QUALITY EVALUATING METHOD OF SOIL SAMPLE

摘要

PURPOSE:To ensure the judgement as to whether a sample represents actually undisturbed soil or not, by providing a plurality of tracers in the surface layer part of the soil to be picked up, measuring the distance between the tracers at a suitable time in the process for pushing a tubular body, and judging the disturbed state of the soil sample. CONSTITUTION:A soil-sample pickup device 4 is pushed into a place, where a sample is to be picked up. A jack 1 is provided between the upper surface of the device 4 and a fixed power shovel 7. When the jack 1 is operated, the pushing pressure is propagated to a blade 11 from an outer tube 9. The device 4 is pushed into the place, where the sample is picked up. As the device 4 is being pushed in the soil vertically, tracers 20 can be recognized through an observing window 14. At this point, the pushing is stopped, and three of the tracers are selected so that the three tracers' positions can be readily recog nized. The position relationship is measured. Thus the disturbed state of the obtained soil can be judged. Whether the sample represents actually undisturbed state of the soil or not can be judged more reliably.