With the theory of particulate matter, firstly, the spatial distribution model of aggregate was put forward based on Monte Carlo method. The discrete element model applied to aggregate at mesoscopic simulation was established. The relationship between mesoscopic parameters of the model and penetration process was discussed. And results demonstrated that the sensitivity of particle friction coefficient and porosity was much larger than the particle contact stiffness ratio in the penetration process. Secondly, numerical model based on the grading fill theory was built to analyse the mechanical response and mesoscopic evolution rules of continuously graded mixtures. And on this basis, the optimum gradation was put forward. Finally, the initial particle structure obtained by random packing model was analysed statistically. After discrete dynamic calculation under gravity loads, the simulation results agreed with the literature measured results , which demonstrated that the accumulation behaviour of particles in gravity field could be better simulated by the numerical simulation method proposed in this paper.

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