Abstract
This study examines the cyclic behavior of calcareous sand obtained from the South China Sea. A series of undrained cyclic triaxial tests were performed on the calcareous sand with various relative densities, cyclic stress ratios, and effective confining pressures. The test results show that whereas the effective confining pressure exhibited a small influence on the cyclic behavior of the calcareous sand, the effect of changes in CSR and relative density was notable. Due to its angular nature, the liquefaction resistance of calcareous sand was much higher than that of silica sand. In addition, differences between calcareous and silica sands in terms of pore pressure generation characteristics and deformation responses were also observed.
Highlights
Calcareous sand is a typical marine sediment that is widely distributed in tropical and subtropical areas
This paper presents the cyclic behavior of the calcareous sand in the South China Sea and highlights the differences between the calcareous sand and Fujian silica sand
During the cyclic triaxial test, both the excess pore pressure and axial strain of the calcareous sand gradually increased as it reached liquefaction, whereas for Fujian silica sand, a sudden increase in excess pore pressure and axial strain was observed when approaching liquefaction state
Summary
Calcareous sand is a typical marine sediment that is widely distributed in tropical and subtropical areas. In these areas, the replacement of silica sand with calcareous sand as filling material for the offshore engineering foundations is convenient and cost-effective. The replacement of silica sand with calcareous sand as filling material for the offshore engineering foundations is convenient and cost-effective Such foundations are often subjected to cyclic loadings, such as waves, winds, and even earthquakes. It is necessary to evaluate the dynamic and cyclic behavior of calcareous sand. This paper performed a series of undrained cyclic triaxial experiments on the calcareous sand retrieved from the South China Sea and compared the results with similar experiments on Fujian silica sand.
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