• Title/Summary/Keyword: 전동 베인

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Comparison of Vane-shear Strength Measured by Different Methods in Deep-sea Sediments from KODOS area, NE Equatorial Pacific (북동태평양 KODOS지역 심해 퇴적물의 베인 전단강도 측정 방법에 따른 결과 비교)

  • Chi, Sang-Bum;Jung, Hoi-Soo;Kim, Hyun-Sub;Moon, Jai-Woon
    • The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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    • v.4 no.4
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    • pp.390-399
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    • 1999
  • Siliceous and calcareous deep-sea core sediments were collected by a multiple corer from the KODOS (Korea Deep Ocean Study) area, northeast equatorial Pacific, to compare vane shear strengths measured by two different apparatuses and in different places of on-board and on-land laboratories. The apparatuses were 1) a hand-held vane with four blades of $2.0{\times}2.0$ cm, and 2) a motorized shear vane system with four blades of $1.0{\times}0.88$ attached on a rotational viscometer. Depth profiles of shear strengths of core samples determined by the apparatuses do not show any consistent difference. Also, there is no consistent difference between shear strength values measured on-board and on-land laboratories after storing the core samples for three months in a cold room by a motorized shear vane system. However, there are considerable differences between depth profiles of shear strengths measured at four different points (holes) of a core sample. Moreover, significant differences among the profiles of different tube samples from a multiple corer within a sampling station were observed. Heterogeneity in physical properties of each depth and sediment column, possibly due to bioturbation and bottom current flows, is likely responsible for the differences in the geotechnical properties.

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A Study on Vane Shear Strength Measurement of Deep-sea Sediment in the Northeast Equatorial Pacific (북동태평양 심해저 퇴적물의 베인전단강도 측정에 관한 연구)

  • 지상범;박정기;손승규;이경용;이현복
    • Economic and Environmental Geology
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    • v.37 no.2
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    • pp.235-244
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    • 2004
  • The shear strength of deep-sea core sediments from the nofheast equatorial Pacific was measured in various conditions to ensure precision of results. The comparison items were 1) two different measuring systems (hand-held vane and motorized vane), 2) in different places of on-board immediately after collecting the core samples and on-land laboratories after storing these samples for three months in a cold room, 3) two different core samples from a multiple corer within a sampling station, and 4) four different measuring points (holes) from a core sample. In this experiment, the values of shear strength in deep-sea sediments show significant change with depth which increase toward the bottom of core. Also, the results of two cores recovered at the same station indicate that vertical variation of shear strength is mainly caused by the change of physical properties. They strongly support the fact that the difference of vue syrtem and/or experimental conditions are not major factor in the variation of geotechnical properties.