Mining and extraction field
Engineering Background
Coal mines and metal mines often require shafts to pass through water-rich sand layers, fault fracture zones, and mined-out areas, making them highly susceptible to sudden water bursts, sand surges, ground subsidence, and abnormal gas emissions—serious safety hazards.
Technical Challenges
The water-bearing sand layer has high fluidity, making the slurry easily dispersed.
The fractures in the mined-out area conduct both water and gas, and conventional grouting is uneven.
The slurry is required to have anti-dispersibility, anti-washout properties, and high strength after curing.
Product Corresponding Features
High Liquidity and Anti-Dispersibility: The standard consistency water requirement is 33–38%, and it exhibits a high retention rate in flowing water environments.
Curing strength: The sand consolidation body has a strength exceeding 40–50 MPa, forming a stable “underground concrete” barrier.
Chemical stability: Low chloride ion content (≤0.06%), with no risk of rebar corrosion.
Professional Processes and Parameters
High-pressure jet grouting: Columnar consolidation bodies are formed in the sand layer, creating an “artificial foundation.”
Curtain grouting: A closed curtain is formed around the wellbore to prevent groundwater infiltration.
Recommended parameters: Grouting pressure: 8 MPa – 12 MPa; water-to-cement ratio: 1.0 – 1.3
Engineering benefits
Eliminate “gushing” water and sand burst accidents.
Reinforce the surrounding rock in mined-out areas to prevent collapse and secondary disasters.
Corresponding target department
Mining Company’s Production Technology Department, Safety and Environmental Protection Department, Mine Water Control Office, and Underground Engineering Team.
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