Abstract The microstructure of calcareous sand sampled from the South China Sea Islands was investigated using X-ray microtomography (μCT). μCT images directly evidenced the amount of inner pores in the calcareous sand. The image analysis presented a map of the inner pore distribution and volume ratio compared with the volume of solid particles, showing that the inner pore distribution was affected by the particle size. Furthermore, owing to the special structure of calcareous sand particles, crushed particles were observed during cyclic loading, inducing obvious strain and releasing air from the inner pore of the particle, which subsequently desaturated the specimen and increased the liquefaction resistance. This evidence of inner pores in calcareous sand provides another way to examine the undrained response by considering the crushability of the calcareous sand.

中文翻译：

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用X射线CT重新审视钙质砂的抗液化能力

摘要 采用 X 射线显微断层扫描 (μCT) 研究了从南海诸岛采集的钙质砂的微观结构。μCT 图像直接证明了钙质砂中内部孔隙的数量。图像分析显示了内孔分布和体积比与固体颗粒体积的对比图，表明内孔分布受粒径的影响。此外，由于钙质砂颗粒的特殊结构，在循环加载过程中观察到颗粒被压碎，产生明显的应变并从颗粒的内孔中释放空气，从而使试样去饱和并增加液化阻力。