With the increasing volume demand of silos, squat silo diameters are bigger and bigger. However, present wall
pressure computation methods are mostly based on small diameter silos. To solve this problem, systematical research on
the wall pressure in squat silos is of great importance. For now, in the Chinese code the wall pressure computation
methods are based on the limit equilibrium theory to be calculated, which define the orientation of the failure plane in the
bulk solid within the silo. The rupture angle is a key parameter to silos’ wall pressure. Therefore the value and direction of
rupture angle are researched by theoretical method in this paper, which has heavy significance and provide an important
basis for the large diameter silo design.