Determination of the rock mass displacement zone by numerical modeling method when exploiting the longwall at the Nui Beo Coal Mine, Vietnam

Purpose. It is important to conduct a study identify the displacement zone caused by mining operations. By numerical modeling process of longwall 31104 in Seam 11 at Nui Beo Coal Mine, Vietnam, authors have deter-mined total height rock mass and boundary affected area on topographic surface. Methods. In this study, use method. The models are developed based UDEC (Universal Distinct Element Code) software. addition, field survey methods statistical analysis used. Findings. Based results, it has been determined that zone, when exploiting 11, about 63 m. results also shows roof collapse angle 52°, which determines influence surface range 160 Originality. software, simulation model for 11. Analysis shown state surrounding mass. method applied simulate consistent with actual production underground mine. Practical implications. displacements determined. At same time, calculated. Thus, research can be used as basis implementation Mine.