Abstract
In this paper, extensive resonant column tests were conducted to investigate dynamic responses of subsea sand-silt mixtures. The effects of confining pressure, mixture ratio, curing age, and cement content were evaluated. For the test condition considered in this study, the measured damping ratio is the smallest when the ratio of subsea sand to silt is in a range of 1.5 to 2.0. Moreover, unsolidified subsea sand-silt mixed at a ratio of 1.5 has almost the same maximum shear stiffness as the pure sand. For solidified subsea sand-silt mixture, cement can significantly increase the dynamic shear stiffness when the curing age is less than 14 days. However, the increase of the maximum dynamic shear stiffness is negligible when the curing age is longer than 14 days. When the cement content is 2%, the damping ratio of the solidified mixtures is very close to that of the unsolidified mixture. When the cement content is higher than 4%, the damping ratio of the solidified mixtures reduces significantly. This is mainly due to hydration reactions occurring in the solidified mixtures.
Highlights
Coastal levees are normally constructed to protect coastal areas, which are vulnerable to suffer the natural disasters such as typhoons and tsunamis
Construction of coastal levees requires a lot of fine-grain soils, but coastal areas lack these types of soils. e coastal levee studied in this paper is located in the coastal area of Fujian Province in China
The dynamic shear stiffness (G) and damping ratio (D) of subsea sand-silt mixtures at different ratios were obtained by conducting resonance column tests. e effects of mixture ratio, consolidation confining pressure, cement content, and curing age on dynamic shear modulus and damping ratio of soil samples were analyzed
Summary
Coastal levees are normally constructed to protect coastal areas, which are vulnerable to suffer the natural disasters such as typhoons and tsunamis. It is found that the dynamic shear modulus and damping ratio were significantly affected by soil type, shear strain, and effective confining pressure [15,16,17,18,19,20,21,22,23,24,25]. Li et al [35] explored the effects of confining pressure, mix proportion, and curing age on the dynamic shear modulus and damping ratio of steel slag sand mixture. As far as the authors are aware, limited studies have been conducted to investigate the dynamic responses of subsea sand-silt mixtures. E effects of confining pressure, mixture ratio, curing age, and cement content on the dynamic shear modulus and damping ratio of the mixtures were analyzed. Based on the basic properties of subsea sand and silt, the subsea sand was classified as wellgraded sand while the silt was classified as a clay with low liquid limit
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