Abstract
Solid bulk cargoes have been known to liquefy in the holds of bulk carriers since the loss of the Bengal in 1910. Because of the increased demand for iron ore fines over the past 20 years, export industries have experienced further incidents where liquefaction of the cargo was the suspected cause. The objective of this study was to develop a scale model of bulk carrier hold in order to investigate the variability of the physical properties of iron ore fines, which govern the liquefaction potential under cyclic loading. Additionally, by associating the theory of liquefaction of partially saturated soils to the cyclic behavior of the samples, the apparent shear strength of the samples can be determined. During this study a scale model and an iron ore fines plunger were developed and utilized. The physical properties of the samples of iron ore fines were monitored during the scale model test, and the point at which moisture migration began to occur was determined. The boundary where the material showed a significant loss of shear strength, referred to as the critical failure curve, was also determined using the iron ore fines plunger. After consistent results were shown using both methods, the moisture content at which the sample was considered potentially liquefiable was concluded and compared with the results from the current test method used to reduce liquefaction incidents on bulk carriers.
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Acknowledgments
The results presented in this publication are from an ongoing postgraduate study at RMIT University in Melbourne, Australia on the liquefaction potential of mineral cargoes onboard bulk carriers.
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Journal of Materials in Civil Engineering
Volume 29 • Issue 7 • July 2017
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©2017 American Society of Civil Engineers.
History
Received: Sep 15, 2016
Accepted: Dec 13, 2016
Published online: Mar 29, 2017
Published in print: Jul 1, 2017
Discussion open until: Aug 29, 2017
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