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Open stope mining is the most common mining method adopted in underground metal mines in Myanmar. However, the assessments on the stability of stope still remain quite limited for this method in under...ground mining. Even though mining objective is to recover ore as much as possible from the vein, safety of workers and machinery in the advancing stopes must be ensured. The main reasons for the occurrence of underground mine’s instabilities come from the stress redistribution in the surrounding previous mined-out activities, the existence of discontinuities and void space, and the influence of on-going mining activities, etc. In addition to these problems, if the underground mining is located near the slope surface, the influence of slope surface should be taken into account to that mining activities. Therefore, considering the importance of rock stability in open stope, the investigations on the stability of advancing stope surrounding the previous mined-out behave together with the influence of slope surface are conducted at Modi Taung gold mine, one of the largest underground gold mines in Myanmar. In this research, the investigations on the stability of open stope are conducted with the variation of differential stress subjected to the rock mass at the planned-mining zones and displacement of stope’s surface in each stope mining activities. From the preliminary outcome of this research, the results show that the rock mass near the slope surface can be more subjected by differential stress than inside of the rock mass. Moreover, the results highlight that the potential buckling failures from hanging wall and foot wall are more severe than the roof fall from the stope’s roof in this mine site. All of these investigations are conducted by means of 3D finite difference software using FLAC3D.続きを見る
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