Abstract
This paper analyzes the compression characteristics of calcareous sands from the South China Sea and the Arabian Gulf through a series of oedometer tests. Based on the test results, we obtain the compression index and the plastic work of sand samples with different initial relative density values. At the same time, we evaluate the sand breakage with relative breakage index proposed by Hardin. The relationship between plastic work and relative breakage index as well as compression index is studied to discuss the influence of particle breakage on compression characteristics of calcareous sands. The results show that the mean diameter and the content of calcium carbonate have a significant effect on particle breakage, which is the main factor inducing the compression deformation of calcareous sands. The relative breakage index of calcareous sands mainly associates with the plastic work and the initial relative density. The relationship between relative breakage index and plastic work is a power function by normalizing of relative density. The power function is also satisfactory for the relationship between compression index and relative breakage index. It could be used to evaluate the effect of particle breakage on the compression characteristics of calcareous sands.
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