Dynamic Pressure Analysis of Eccentric Discharge of the Double-storey Squat Silo

A numerical analysis model for dynamic pressure during eccentric discharge in double-story squat silos was established using the Discrete Element Method (DEM). This paper investigated the dynamic interactions between the silo structure and grain particles during eccentric discharge, systematically analyzing dynamic lateral pressure, wall stress, structural displacement, particle contact stress, and velocity distribution across different orientations. The results demonstrate that：(1) The lateral pressure diminishes significantly on walls farther from the discharge opening during eccentric discharge. (2) The maximum wall stress in the upper layer occurs at 0.35 m elevation, with both peak stress and displacement decreasing progressively during discharge. (3) As the number of discharging holes increases, the contact stress of the particles decreases gradually. Particle velocity exhibits temporal escalation, particularly pronounced near the discharge orifice where velocity gradients intensify markedly. These findings provide theoretical insights and technical references for optimizing structural design and performance evaluation of double-story squat silos.