Abstract
In this research, the concept of elastic overpressure fluctuation is introduced on the basis of the overpressure theory in the arch action, the formation of overpressure in the arch action is investigated with the elastic fluctuation on the silo wall. The formation and elastic fluctuation of overpressure in arch action is analyzed systematically with the laboratory experiment and the PFC simulation which were established on the basic of a project example, the models achieve the arch action by changing factors such as the physical parameters of grain and cone half angle of the silo hopper. The results obtained indicate that the increment of pressure and the overpressure coefficient all decrease with height. And the overpressure started from the arch feet, propagated upward in the form of fluctuation on the silo wall. In addition, the overpressure fluctuations propagate uniformly which is illustrated by observing the time step of when the pressure fluctuations amplitude occur at each monitoring points. The results reveal the formation mechanism of the overpressure in arching, and the relevant research conclusions would be of great reference significance for the design of silo.
Highlights
Silos are widely used in the industry with particulate engineering, the phenomenon of the material arch action occurs frequently, it would be difficult to reflect the overpressure formation mechanism in arching objectively by the existing laboratory experiment and theoretical calculation models
Arch is the key of the research, dynamic simulation analysis is performed for discharge and grain arch
It could be clearly seen that the pressure of silo wall and the overpressure coefficient for the arch action increase with depth, in addition, the overpressure of different monitoring points for the arch action would not occur at the same time
Summary
Silos are widely used in the industry with particulate engineering, the phenomenon of the material arch action occurs frequently, it would be difficult to reflect the overpressure formation mechanism in arching objectively by the existing laboratory experiment and theoretical calculation models. Theoretical calculation formulas to quantify the silo wall pressure have been proposed, such as the famous Jassen formula [1,2,3]. For the arch action, studying the formation of elastic fluctuation has important reference significance for revealing the overpressure formation mechanism. A scale model was established with engineering examples, laboratory experiment and PFC discrete element simulation which established with this scale model were used to simulate the dynamical process of outflow, the formation and propagation mechanism of overpressure are analyzed by revealing the effect of elastic fluctuation on the arch overpressure.
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