Question

Massive sandstone in immediate roof delays the local fall in roof of a coal mine. Under this condition, crushing of the pillars at out-bye side is called

• A. Coal bump
• B. Overriding of pillars
• C. Stiffening of pillars
• D. Spalling of pillars

Hint:

Overriding occurs when massive roof transfers load onto pillars.

Answer 1

The Correct Option is B

When a strong roof delays collapse, pillars near the goaf or out-bye side may be crushed due to additional load, called overriding of pillars.