What is the purpose of grouting in mine development?

Solution (By Examveda Team)

Definition of Grouting:
Grouting is a technique used in mining and civil engineering to inject a fluid material—typically cement-based, chemical, or resin grout—into rock or soil to fill cracks, fissures, or voids. Once the material sets, it strengthens the ground and helps seal off pathways for water or gas infiltration.

Correct Answer: Option B: Reduce water inflow
The correct answer is Option B: Reduce water inflow because the main function of grouting in mine development is to seal water-bearing fractures and reduce or completely block the inflow of groundwater into the underground workings. This is crucial for maintaining safe, dry, and stable conditions during tunneling, shaft sinking, or excavation.

By controlling water ingress, grouting prevents potential flooding, minimizes the need for continuous pumping, and reduces the risk of ground instability caused by water pressure. It also makes drilling and blasting operations more effective and safer in saturated zones.

Grouting is often done ahead of development headings in advance of expected water-bearing zones or during shaft sinking in wet ground. The process enhances the structural integrity of the surrounding rock mass and ensures that construction can proceed efficiently and safely.

Explanation of Other Options:
Option A: Ore extraction
Ore extraction involves drilling, blasting, and transporting broken ore, not sealing fractures or water channels.

Option C: Explosive charging
Explosive charging is related to blasting operations and has no direct connection with the grouting process.

Option D: Increase ventilation
Ventilation is improved through the construction of airways and installation of fans—not by injecting grout into the rock.

Conclusion:
Therefore, the correct answer is Option B: Reduce water inflow, as grouting is primarily employed in mine development to control groundwater and improve ground stability by sealing water pathways.