Question:
Massive sandstone in immediate roof delays the local fall in goaf of a coal mine. Under this condition crushing of the pillars at outbye side is called
Massive sandstone in immediate roof delays the local fall in goaf of a coal mine. Under this condition crushing of the pillars at outbye side is called
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Delayed roof collapse transfers excessive load to adjacent pillars, leading to
\[
\boxed{\text{Overriding of pillars}.}
\]
Updated On: Jul 14, 2026
- Coal bumps
- Overriding of pillars
- Spalling of pillars
- Stiffening of pillars
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The Correct Option is B
Solution and Explanation
Step 1: Recall the effect of a strong immediate roof.
A massive sandstone roof delays caving in the goaf, causing additional stress to be transferred to the outbye pillars.
Step 2: Identify the phenomenon. The crushing of these heavily loaded outbye pillars is known as \[ \boxed{\text{Overriding of pillars}.} \] Therefore, \[ \boxed{(B)} \] is the correct answer.
Step 2: Identify the phenomenon. The crushing of these heavily loaded outbye pillars is known as \[ \boxed{\text{Overriding of pillars}.} \] Therefore, \[ \boxed{(B)} \] is the correct answer.
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