Abstract:

Na Duong coal mine has a geological structure of Neogene layer, so there are frequent landslides of the foot wall, causing unsafety for the deep bench mining process. On the other hand, coal seam number four of the southern foot wall, there are special construction works that need to be protected with a high degree of safety requirements. Technological solutions to treat the Na Duong coal mine’s foot wall have been theoretically studied, including: Soil and rock removal solutions to limit mine bank vibration such as drilling and blasting with large borehole diameter, blasting to reduce vibrations and loosen the rock and soil by a ripper; Drilling solution for pressure relief and monitoring of mine slope stability. The results of field tests at Na Duong coal mine’s foot wall are the basis for the mine to continue to apply foot wall treatment solutions to actual production in the following years and ensuring the safety of surface constructions and deep mining