Abstract:

Through adding modifiers and active substances into the raw materials, developed environmental-friendly two-component chemical grouting material with less volatile organic compounds and high early strength. The material could solidify within 60 seconds after two-component mixed. The compressive strength, shear strength and adhesive strength of the 4-hour solidification were more than 36mPa and 18mPa and 2.6mPa respectively. Owing to broken and falling roof of the open-off cut in a coal mine, adopted the two-component grouting material to reinforce the roadway. Results showed that, the grouting evidently improved strength and integrity of the broken roof, and effectively controlled roof falling and rib spalling and increased excavation velocity，assured safety and high efficiency mining.

Key words: grouting material, open-off cut, broken coal and rock mass, advanced reinforcement, grouting parameters