It has been recognised that the state of stresses developed within the particulate solids
during filling undergoes a change at commencement of discharge. Such a change causes a
redistribution of stress within the particulate solids, and leads to a shift of loads on the
walls of the silo and on the insert accordingly. The degree and the extent of stress change
are reliant on the flow mode in discharge: mass flow or funnel flow; the size and shape of
moving zone if the flow is in funnel flow mode.