Abstract
The coal extraction in longwall creates voids that destroy the natural stress balance in underground. This causes deformation and failure of rock and consequently damage of surface construction and environment. In Vietnam, surface construction damage caused by underground mining is quite common such as fan station at level +142 m Mao Khe coal mine, water burst at roadway level -60 m Thong Nhat coal mine, road crack near Yen Tu pagoda, or surface subsidence at Khe Cham coal preparator. Due to the displacement magnitude and nature of damaged constructions such as private house, industrial building or railway, a coal mine may need to stop production and suffers great economic loss. The East wing of L7 coal seam is medium in thickness and gentle-inclined in dip angle. It completely underlays the G9 storage at Mong Duong coal mine. According to the mining schedule, this seam is planned to be extracted by drilling-and-blasting method and be supported by self-moving hydraulic frame GK. This poses a safety risk to equipment operating in the storage. It is extremely necessary to find a reasonable mining solution to ensure the safety of G9 coal storage constructions and minimize the loss of resources for this L7 coal seam. In this paper, the author uses numerical modelling method to determine the impact of underground mining on surface constructions in G9 coal storage at Mong Duong coal mine.
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