A grain storage bin is classified as a 'deep bin' (silo) rather than a 'shallow bin' when:
Options:
(A) The rupture plane of the stored grain intersects the opposite vertical wall of the bin before reaching the free grain surface
(B) The total depth is greater than twice the length
(C) The bin is constructed of reinforced concrete rather than steel
(D) The grain is stored in bagged form
Answer Key:
A
Step-by-Step Solution & Explanation
According to Janssen's and Airy's theories, a bin is structurally defined as a deep bin (silo) when the plane of rupture of the granular fill intersects the opposite vertical bin wall before breaking through the upper grain surface. In shallow bins, the rupture plane emerges at the top surface.