The macroscopic engineering properties of natural sands, including compressibility, shear strength, crushability and critical state behavior, were demonstrated to be significantly affected by particle morphology through computational and experimental methods. As a typical kind of naturally occurring granular materials, sand particles often retain their inherent morphological features derived from the generating environment, geological process, and chemical compositions. Shapecharacteristics of ballast aggregates subjected to monotonic and cyclic triaxial tests indicated that particle shape varies with load frequency because of breakage and the ballast aggregates become increasingly regular with the increase of load frequency. Recent years have seen increasing research efforts aimed at gaining better approaches to the acquisition of authentic particle morphology, and more insights into the relationships between morphological features and macroscopic responses. Particle morphology is an important factor affecting the mechanical properties of granular materials. The results showed that the irregularity, angularity and roughness of CS is higher than that of FS, and the multiscale morphological features of the two types of natural sand were given and compared digitally. Two typical sand particles, Calcareous sand (CS) and Fujian sand (FS), were tested in this study. The 3D sphericity, roundness and roughness were introduced to define the particle morphology at three scale levels (the general shape, local angularity and surface textures). In this context, the high-resolution X-ray micro-computed tomographic (X-CT) scanning and spherical harmonic (SH) analysis were combined to complete the precise and digitized reconstruction of sand particles. The division and separation of particle morphology at different scale levels contributes to the further multiscale morphology related orthogonal researches. Particle morphology is a fundamental inherent property that substantially affects the macroscopic behavior of granular materials. 2College of Civil Engineering, Nanjing Forestry University, Nanjing, China.1Key Laboratory of Geomechanics and Embankment Engineering of Ministry of Education, Hohai University, Nanjing, China.Hui Liang 1, Yang Shen 1*, Junhong Xu 2 and Xue Shen 1
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