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ABSTRACT The mechanical properties of soil samples are directly determined by their behavior when the material is subjected to changes in pore-water pressure and by the rearrangement of soil particles caused by the penetration of the tube during sampling. Shogaki (2017) examined how samples were disturbed by tube penetration during a single tube sampling based on pore-water pressure, void ratio, and the movement of clean sand particles. However, the model tests were conducted in the laboratory under atmospheric condition, i.e., not under confining stress. In this paper, the effect of the confining pressure on the deformation behavior of Toyoura sand and Kawasaki clay caused by tube and cone penetration is examined under confining stress.
INTRODUCTION The mechanical properties of soil samples are directly determined by their behavior when the material is subjected to changes in pore-water pressure and by the rearrangement of soil particles caused by the penetration of the sampling tube during sampling. Shogaki (2017) examined how samples were disturbed by tube penetration during a single tube sampling based on pore-water pressure, void ratio, and the movement of clean sand particles. Samplers with tubes having inner diameters of 35, 45, and 75 mm, and cutting-edge angles of 6° and 90° were used for the model tests on Toyoura sand. The speed of penetration was 0.6–5.8 cm/s while the relative density ranged from 6% to 83%.
Horng et al (2010) also discussed the effect of the sampling-tube geometry on reconstituted Kasaoka clay samples prepared in the laboratory under atmospheric conditions, i.e., not under confining stress. The height of the tank used in their 1-g physical model test was about 30 cm. Shogaki (2016) demonstrated that the semicircular tube penetration of Toyoura sand was similar to circular cylinder tube penetration of sands from Niigata Meike, Niigata Airport, Niigata East Port, the port of Kansai, and the third Meiji fortress (Shogaki, 2016). However, these model tests were conducted in the laboratory under atmospheric conditions, i.e., not under a confining stress.
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