A method for analyzing the stability of waste dump based on particle size scale distribution

The uneven distribution of granular size along the slope is the main characteristic of the dump, and the shear performance of the mixture determines the stability of the dump slope structure. In this paper, the south dump of Dasu Jiji Molybdenum Mine is taken as the research object, and the particle size composition of the dump distributed along the slope is determined by field test. The fractal geometry theory is applied to determine the fractal characteristics of the granular particles, and the shear strength characteristics of the particle size composition with different fractal characteristics are analyzed in the laboratory. The deformation law of the slope is analyzed by discrete element simulation. The results show that the particle size composition of the soil and rock mixture in the dump has obvious fractal characteristics along the slope height. The shear strength parameters of granular particles with different particle size composition are different, and the large particle size plays the role of shear skeleton. The discrete element simulation shows that the slope with small fractal dimension size has stronger deformation resistance, and the particles in the deformation area of the high dimension model are more active, easy to expand to the slope and the interior, and the stress in the measured circle is greater.