Study Of The Water Prevention Technology On The Working Face Under Great Depth And Complicated Hydrogeological Conditions

Water inrush from coal floor has been one of the big disasters that endanger the security of the mining production in China. The mine hydrogeology conditions become more and more complicated with the increase of mining deepness. The study of working face mining technology with complicated hydrogeology condition at great depth has important significance for ensuring mine safety production. Based on the analysis of hydrogeological conditions, field observation, laboratory similar simulation experiment, numerical simulation, the thesis adopts theories of material mechanics, elastic mechanics, damage mechanics and so on, applies artificial intelligence prediction method to study comprehensively working face mining technology with complicated hydrogeology condition at great depth. It mainly includes mine hydrogeology law, bottom failure law, bottom grouting reinforcement technique, fault mining failure law, which was obtained law of groundwater storage and migration. Analysis and evaluation are made regarding to water inrush possibility from test working face. The thesis establishes prediction model that obtain depth of destroyed bottom. And it also establishes complete set of bottom reinforcement technique, the grouting method with superhigh pressure, including dispersed pulp, slurry with thin pipeline, double reinforced pipe to prevent blowout and repeated grouting, was designed. Furthermore, it establishes coal mine water hazard control technique, such as crossheading tilting prevention device, contractible high-strength closed supporting technique, prevent flooded measure during shaft construction. The research results were used in Zhaogu No.2coal mine, which has achieved remarkable economic benefit.