Quantification of the morphology of shelly carbonate sands using 3D images
Quantification of the morphology of shelly carbonate sands using 3D images
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DOI：
10.1680/jgeot.16.p.278
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发表时间：
2018-03-01
期刊：
影响因子：
5.8
通讯作者：
Fonseca, J.
中科院分区：
文献类型：
--
作者：
Kong, D.;Fonseca, J.
在世界上海上结构物建设需求量很大的地区，贝壳碳酸盐砂数量激增。这些结构较弱的砂具有较高的粒内空隙和复杂的角粒形状。为了提高对材料机械性能的理解，需要进行详细的形态量化。本文基于 X 射线计算机断层扫描图像分析，提出了贝状碳酸盐砂形态的三维表征。对来自波斯湾的两种具有不同级配的沙子进行了研究。开发了一种自适应分水岭分割技术来识别单个颗粒以进行后续的颗粒尺度分析，从而克服了这些沙子复杂的微观结构带来的挑战。对尺寸、晶粒内空隙和各种形状参数进行非侵入性测量，并进行统计分析，以表征晶粒。研究结果有助于更好地理解颗粒互锁机制，以及颗粒棱角和颗粒内空隙率对贝壳碳酸盐砂力学行为的作用。
Shelly carbonate sands proliferate in regions of the world where construction of offshore structures is in high demand. These structurally weak sands have high intra-granular voids and complex angular grain shapes. To improve the understanding of the mechanical properties of the material, a detailed morphological quantification is required. This paper presents a three-dimensional characterisation of the morphology of shelly carbonate sands based on analyses of X-ray computed tomography images. Two sands from the Persian Gulf with distinct grading were investigated. An adaptive watershed segmentation technique was developed to identify the individual grains for subsequent grain-scale analysis, which overcomes the challenges posed by the intricate microstructure of these sands. Non-invasive measurements of size, intra-granular void and various shape parameters were carried out, and statistical analyses were conducted, to characterise the grains. The results help to better understand the mechanisms of grain interlocking, and the role of grain angularity and intra-granular void ratio on the mechanical behaviour of shelly carbonate sands.