In addition to laggings, what action must be taken with fractured and broken roof or back?

Prepare for the Mine Safety DAO 2000-98 Test. Study with flashcards and multiple-choice questions, each with hints and explanations. Get ready to pass!

Multiple Choice

In addition to laggings, what action must be taken with fractured and broken roof or back?

Explanation:
When the roof or back is fractured or broken, lagging alone isn’t enough to keep the opening safe. You must tightly block the area. Blocking places timber blocks firmly against and across the fractured section to fill the gaps and grip the broken pieces, creating a solid bearing for the load. This locks the loose rock in place and helps transfer weight to solid rock, reducing the chance of movement or collapse while additional support is arranged. Leaving it as-is would allow movement; repainting isn’t a structural remedy. Steel reinforcement can be part of stabilization, but the immediate required action described here is to block tightly to stabilize the broken roof.

When the roof or back is fractured or broken, lagging alone isn’t enough to keep the opening safe. You must tightly block the area. Blocking places timber blocks firmly against and across the fractured section to fill the gaps and grip the broken pieces, creating a solid bearing for the load. This locks the loose rock in place and helps transfer weight to solid rock, reducing the chance of movement or collapse while additional support is arranged. Leaving it as-is would allow movement; repainting isn’t a structural remedy. Steel reinforcement can be part of stabilization, but the immediate required action described here is to block tightly to stabilize the broken roof.

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