Abstract
Liquefied submarine sediments can easily lead to submarine landslides and turbidity currents, and cause serious damage to offshore engineering facilities. Understanding the rheological characteristics of liquefied sediments is critical for improving our knowledge of the prevention of submarine geo-hazards and the evolution of submarine topography. In this study, an in situ test device was developed to measure the rheological properties of liquefied sediments. The test principle is the shear column theory. The device was tested in the subaqueous Yellow River delta, and the test results indicated that liquefied sediments can be regarded as “non-Newtonian fluids with shear thinning characteristics”. Furthermore, a laboratory rheological test was conducted as a contrast experiment to qualitatively verify the accuracy of the in situ test data. Through the comparison of experiments, it was proved that the use of the in situ device in this paper is suitable and reliable for the measurement of the rheological characteristics of liquefied submarine sediments. Considering the fact that liquefaction may occur in deeper water (>5 m), a work pattern for the device in the offshore area is given. This novel device provides a new way to test the undrained shear strength of liquefied sediments in submarine engineering.
Highlights
Submarine sediments can be liquefied under dynamic loads [1]
Clarifying the rheological characteristics of liquefied sediments at the solid–fluid transition is of great significance for early warning of submarine geo-hazards and for the in-depth understanding of the evolution of the submarine topography
To overcome the limitation of current test methods, this paper introduces an in situ test device based on the shear column theory
Summary
Submarine sediments can be liquefied under dynamic loads (e.g., wave loads, earthquakes, engineering activities) [1]. The liquefied sediments are characterized by low shear strength and high fluidity, with properties lying between a solid and fluid [2]. They likely lead to the occurrence of various marine geo-hazards, such as collapses, submarine landslides, and turbidity currents [3,4,5,6]. Clarifying the rheological characteristics of liquefied sediments at the solid–fluid transition is of great significance for early warning of submarine geo-hazards and for the in-depth understanding of the evolution of the submarine topography
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