Grain Storage Structures and Silos

In Janssen's theory for grain pressure distribution in deep storage bins and silos, the lateral pressure reaches an asymptote with increasing depth because:

Options:

• (A) Part of the vertical grain weight is transferred to the vertical bin walls via wall friction
• (B) Grain density decreases toward the bottom
• (C) Grain behaves purely as a frictionless fluid
• (D) Air buoyancy counteracts the grain weight