科研之友
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摘要
Calcareous sand is a marine sediment formed in saturated calcium carbonate solution due to long-term physical, biochemical, and chemical processes, and it has been widely employed as the construction material for artificial islands. Its mechanical properties play an important role for its safe utilization in artificial islands. Considering that the calcareous sand continuously bears dynamic load in the marine environment, investigating the dynamic strength characteristics of calcareous sand under cyclic loading is necessary. To realize this, a series of single-particle crushing tests were carried out with a single-particle cyclic loading apparatus on the South China Sea calcareous sand of different shapes and sizes. Weibull statistical function is used to describe the distribution law of single-particle dynamic strength under each particle size. The results show that the failure modes of single-particle calcareous sand during dynamic loading can be categorized into two types: one is particle crushing before a threshold force is reached, and the other is particle breakage at a force larger than the threshold force. The dynamic strength distribution of single particles was found to be related to particle size. The larger the particle size is, the lower the particle strength is. Considering dynamic strength, single particles with the same particle size can be ranked in the following order: block granules> bar granule> sheet granules. In addition, the single-particle strength follows Weibull distribution, and a linear relationship exists between the characteristic dynamic single-particle strength and the particle size on double logarithmic scales. ? 2019, Editorial Board of Journal of Tianjin University(Science and Technology). All right reserved.
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