Wheat granular material stored in silos usually suffers
shearing loads, which induces complex stress-strain response
during the silo filling and discharging process. In order to guarantee
the safe storage of these granular materials, it is necessary
to investigate the shearing behaviour of wheat granular material
in silos. In this paper, a series of triaxial tests were conducted on
wheat granular material by using a modified double cell triaxial
system. The stress-strain responses including the volumetric strain
behaviour were examined considering the effect of the initial void
ratio, confining pressure and shearing velocity. Different shearing
states were discussed to obtain their strength parameters in various
conditions. The results show that the shearing characteristics
of wheat granular material are influenced by the shearing velocity.
The friction angles increase with the decreasing void ratio at different
states. The final volumetric strain decreases with increasing
confining pressure, and the dilation is diminished. The dilatancy
behaviour was quantitatively evaluated based on Row’s theory for
wheat granular material. The stress-strain relationship of wheat
granular material was then determined.
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