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Abstract The microscopic geometrical characteristic of the surface sedimentary tailings is described in this paper. Microscopic experiment and theoretical analysis were used to research the microscopic geometric characteristics of tailings and the effect of distance on microscopic geometric characteristics. Some charts and indicators were used to describe the microscopic geometric characteristics，such as the number or area frequency distribution histogram of grain size，circularity，roundness and textural fractal dimension. Tailings grains according to their microscopic geometrical characteristics were divided into the micron-sized grains and the non-micron grains with the boundary of 35 ?m. The derived formula showed that the distribution of surface sedimentary tailings was affected by the grain size，initial flow velocity，gradient，etc. The stress ratio was 1.4 when tailings reached the critical state.
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2016, Vol. 35 
