STUDY ON LATERAL BULK-SOLID PRESSURE OF STEEL SILOS

摘要

Bulk-solid lateral pressure of steel silo is very complicated. Janssen equation has been long used for silos lateral pressure calculation, but the equation ignores pressure jump during discharging. The aim of this paper is to simulate silo lateral pressure and obtain pressure equation when silo discharging. To this end, the ANSYS program is employed for simulation and shear failure theory is used for new formula derivation. The results obtained include the lateral pressure law for both static and discharge conditions. Influence of flow angle is also discussed in this paper. Based on this, several suggestions on the design of silos are put forward. They are: (1) Compared with the results of Janssen equation, the maximum lateral pressure of simulation increases by 2 times during discharging, so the Janssen equation should be modified. (2) Flow angle is an import factor for silo pressure calculation. (3) This paper presents a funnel flow equation which could be used to calculate the pressure jump during discharging.