Study on slope stability of 410 sump area in Yuanbaoshan open-pit Coal mine

• 1、Yuanbaoshan Open-pit Coal·Mine of National·Energy PinezhuangCoal·Industry(Group)Co.,Ltd, Chifeng024076,InnerMongolia)

Abstract：In order to ensure the safe production of Yuanbaoshan open-pit coal mine, in view of the slope of 410 sump in the east of the second district, in-depth research was carried out by means of field investigation, experimental test and numerical simulation. Through supplementary exploration of engineering geology, the characteristics of geological structure and rock mass are accurately determined, and the key parameters are obtained by physical and mechanical experiments. The slope stability is comprehensively analyzed by limit equilibrium method (simplified Bishop method and residual thrust method) and FLAC3D numerical simulation method. The results show that the slope stability coefficient of the original south sump is 1Study on slope stability of 410 sump area in YuanbStudy on slope sStudy on slope stability of 410 sump area in Yuanbaoshan open-pit Coal minetability of 410 sump area in Yuanbaoshan open-pit Coal mineaoshan open-pit Coal mine.27, which is slightly lower than the safety reserve coeffStudy on Slope Stability of Sluice Area in East 410 of the Second District of Yuanbaoshan Open-pit Coal Mineicient of 1.3. After moviStudy on Slope Stability of Sluice Area in East 410 of the Second District of Yuanbaoshan Open-pit Coal Mineng to the north, the stability coefficient is increased to 1.52, which meets the safety requirements. Further research shows that the slope instability is mainly caused by the sliding of rock and soil along the weak layer under the action of gravity and the stress concentration caused by the intersection of faults and weak layers. The research results provide an important reference for slope stability research and engineering practice of similar open-pit coal mines.

Keywords： slope stability engineering geology limit equilibrium method numerical simulation