Discussion
Assertion (A): Grain bin walls must be designed for substantial lateral pressure.
Reason (R): Wall friction carries an increasing share of the grain's weight as depth increases.
Select the correct answer from the options below.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism, which is Janssen’s analysis. Grain transmits part of its vertical load sideways to the wall, where friction supports it, so an increasing share of the weight is carried by the walls as depth increases. The lateral pressure is therefore substantial, and the vertical pressure on the floor approaches a limit rather than growing without bound.
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