The rock reinforcement systems are used:

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SSC JE Civil 15 Nov 2022 Shift 3 Official Paper
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  1. in making of cofferdams
  2. for constructing bridges on long rivers
  3. while casting foundations for high rise buildings
  4. to add additional stability to rock tunnels in which structural defects exist in the rock

Answer (Detailed Solution Below)

Option 4 : to add additional stability to rock tunnels in which structural defects exist in the rock
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Explanation:

Rock Reinforcement:

  • The rock reinforcement systems to stabilize tunnels, surface, underground mines, and mine roadways intersections are designed using Factor of Safety (FoS), which is a ratio of the reinforcement resistance to the roof rock-load of overlying immediate strata. 

The following applications of rock reinforcement are mentioned below:

  1. Rock reinforcement (rock anchor) is used to anchor suspension cables and guy wires to bridges.
  2. To strengthen (provide additional stability) the rock mass internally by increasing its resistance to shear stress and sliding along fractures.
  3. Rock anchors can be used to support sheet piles.
  4. Uplift due to lateral forces in transmission towers, foundations, and hydraulic structures is resisted by rock reinforcement.
  5. It helps to tie down the wire cables with the foundation under the sea.
  6. Rock reinforcement is used to pre-load the foundation.
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