Measurement of the viscosity coefficient of liquefied silty soil
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Seabed liquefaction occurs frequently under waves in coastal areas due to accumulation of excess pore water pressure. During wave-induced liquefaction, submarine silty soil fluctuates like a fluid. In this study, a set of falling-ball test devices was made and used to measure the viscosity coefficient of liquefied silty soil during silty soil fluctuation experiments. Smooth density balls (copper, iron, and zirconia) of three different densities were used. A laser displacement sensor was used to record the displacement of the density ball with time. Each density ball sank at a constant speed when the forces on the ball reached equilibrium. According to the result of the force analysis, the movement of a density ball in this period could be regarded as vertical uniform motion, and the ratio of displacement to time was used as the sinking speed. Therefore, the viscosity coefficient of liquefied soil was calculated via Stokes’ law. Because of the smaller density and the effect of the movement of liquefied soil, there was a large error with the measurement of the zirconia ball in the falling-ball method. Therefore, the data for other density balls (excluding zirconia balls) were selected. The results showed that the range of the viscosity coefficient of the liquefied silty soil was 0.81–1.71 kPa s. The fluctuation amplitude of the liquefied soil and the effects of soil action on viscosity measurements were also evaluated. Thus, Stokes’ law can be used to calculate the viscosity coefficient of liquefied silty soil by the falling-ball method.
The falling-ball tests were carried out at the Ocean University of China. Thanks are extended to LetPub (www.letpub.com) for linguistic assistance during the preparation of this manuscript. The authors deeply appreciate the help of these abovementioned sources.
This study was funded by the National Natural Science Foundation of China (Grant No. 41576039).
- Chen Y, Liu H, Shao G, Zhao N (2009) Laboratory study on flow characteristics of liquefied and post-liquefied sand. Chin J Geotech Eng 31:1408–1413Google Scholar
- Christian JT, Taylor PK, Yen JK, Erali DR (1974) Large diameter underwater pipe line for nuclear power plant designed against soil liquefaction. Proceedings of the Sixth Annual Offshore Technology Conference, Houston, USA. pp 597–606Google Scholar
- Coleman JM, Prior DB, Garrison LE (1980) Subaqueous sediment instabilities in the offshore Mississippi River delta. Bureau of Land Management, New Orleans OCS OfficeGoogle Scholar
- Dunlap W, Bryant WR, Williams GN, Suhayda JN (1979) Storm wave effects on deltaic sediments - results of SEASWAB I and II. Proceedings of The fifth Port and Ocean Engineering Under Arctic Conditions Conference, Trondheim, Norway. pp 899–920Google Scholar
- Hamada M, Wakamatsu K (1998) A study on ground displacement caused by soil liquefaction. J Jpn Soc Civ Eng (596):189–208Google Scholar
- Hamada M, Sato H, Kawakami T (1994) A consideration of the mechanism for liquefaction-related large ground displacement. Proceedings from the Fifth US-Japan Workshop on Earthquake Resistant Design of Lifeline Facilities and Countermeasures Against Soil Liquefaction, Technical Report NCEER-94-0026. pp 217–232Google Scholar
- Kawakami T, Suemasa N, Hamada M, Sato H, Katada T (1994) Experimental study on mechanical properties of liquefied sand. In: Proceedings of the 5th US–Japan workshop on earthquake resistant design of lifeline facilities and countermeasures against soil liquefaction. Salt Lake City, USA, Technical report NCEER-94-0026. pp 285–299Google Scholar
- Liu T, Cui F, Zhang M (2016) Dragging ball test on flow characteristics of liquefied silt under wave loading (in Chinese). Acta Oceanol Sin 38:123–130Google Scholar
- Miyajima M (1995) Experimental study on characteristics of liquefied ground flow. Proc. IS-Tokyo, 95 the First International Conf pp 969–974Google Scholar
- Wang X (2010) Experiments study on movement characteristics of liquefied silty seabed under waves. Ocean University of China, Qingdao, China. Master’s ThesisGoogle Scholar
- Xu G, Wei C, Sun Y, Song Y (2008) The engineering characteristics of shallow disturbed strata and analysis of their formation on the subaqueous Yellow River delta. Mar Geol Quat Geol 6:19–25Google Scholar