Controlling large deformations in soft rock roadways with integrated anchor shotcrete and grouting techniques

Area of Science:

• Mining Engineering
• Geotechnical Engineering
• Materials Science

Background:

• Soft rock roadways in underground coal mines face challenges due to rock weakness and water sensitivity.
• Existing support systems (rock bolts, cable bolts) proved insufficient for significant roadway deformation at Lvtang Coal Mine.

Purpose of the Study:

• To analyze the causes of deformation in a soft rock roadway tailgate.
• To develop and validate a novel synergistic support strategy for soft rock roadways.

Main Methods:

• In-situ tests and clay mineral analysis to identify deformation mechanisms.
• Numerical simulations to evaluate support scheme effectiveness.
• Field implementation and monitoring of the proposed support system.

Main Results:

• Low rock strength and weathering susceptibility were identified as primary causes of deformation.
• The novel synergistic support strategy significantly reduced rib deformation by 66%.
• The improved support system effectively maintained tailgate stability.

Conclusions:

• The synergistic support strategy is effective for mitigating large deformations in soft rock roadways.
• This approach provides a valuable engineering reference for similar mining conditions.
• The study highlights the importance of tailored support systems for challenging geological environments.