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Which statement about Janssen's analysis is TRUE?

  • A.Wall friction can be neglected in deep bins
  • B.Lateral pressure is zero at the surface and at the floor
  • C.Floor pressure approaches a limit with depth
  • D.Grain behaves exactly as a liquid in a bin

Answer: C

Correct answer: Floor pressure approaches a limit with depth

This is the central result of Janssen’s analysis. Because wall friction carries an increasing share of the weight as depth increases, the vertical pressure on the floor approaches an asymptote instead of rising in proportion to depth as it would in a liquid. That is why a tall grain bin does not need a floor designed for the full head of material.

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