Influence of underground mining activities on the topographic surface, case study of Nui Beo Coal Mine (Vietnam)

Purpose. Coal mining activities by underground method will disrupt the equilibrium of surrounding rock mass. In mining, determining influence zone exploiting longwall on topographic surface is extremely important.Through analyzing displacement and deformation mass when 21103 in Seam 11 at Nui Beo Mine, to be determined this order forecast boundary that may affect works, ensuring safety such works. Methodology. To achieve research results, actual field survey methods, data analysis numerical modeling methods are used article. Findings. Analysis results from model total height collapsed cracked area about 85 m. The subsidence ground 10 cm center area. also show roof collapse angle 69°, thereby range 55 Results cross-sections closest section 6–6, which 12 stability time 5 months. Originality. On basis UDEC (Universal Distinct Element Code) software, authors have developed a simulation for process 11. has shown state study, applied simulate longwall, consistent with production mine. This enabled assess identify affected required degree reliability. Practical value. paper as implementation Mine. displacements deformations, been determined. At same time, calculated. So, Mine plan construction works site outside areas ensure