Abstract: Rockfill material is a super large-size aggregate in rock-filled concrete, and the geometry of its particles has a significant effect on its mechanical properties. This study selects randomly 102 rockfill samples with a particle size range of 3 - 40 cm, and constructs a 3D digital model library of rockfill material using a multi-view 3D reconstruction technology. And correlation between the shape parameters of rockfill is discussed with a quantitative analysis and evaluation. The results show this technology can effectively construct a high-precision 3D model for rockfill materials. The main part of the rockfill aggregate in the samples is made up of spherical particles; The specific surface area decreases with the increase in particle size, and falls mostly in the range of 0.08 - 0.2 cm2/g. The value of psephicity decreases with an increase in aspect ratio, and follows a normal distribution as its sphericity does; it features good fractal characteristics with a three-dimensional fractal dimension of 2.01. This study has constructed a useful rockfill model for numerical simulations of rock-filled concrete and in-site evaluation of rockfill geometry.

Key words: rock-filled concrete, multi-view image, three-dimensional (3D) reconstruction, rockfill material, geometrical morphology