Study On Slope Stability Of Sanyou Rock Mine Converted From Open-pit To Underground

With the exploitation of mineral resources for a long time,the reserves of shallowburied minerals are gradually decreasing,and more and more open-pit mines are gradually converted to underground mining.In the process of transferring from open-pit to underground mining,a stable slope is the premise to ensure the smooth progress of open-pit to underground mining,and it is of great practical significance to study the problems related to slope stability.The slope stability in the process of transferring from open pit to underground mining in Sanyou Stone Mine was studied by means of similar experiment and numerical simulation.The quality of rock mass is evaluated by investigating the structural plane of the slope,and the physical parameters of the rock mass are estimated.The displacement and stress changes of the slope in the process of underground mining are studied by using the similar experiment,and the process of underground mining is simulated by using the GDEM numerical simulation software,and the displacement changes and stress distribution of the slope rock mass in the process of underground mining are obtained.By comparing the simulation results with the experimental results,the variation law of slope displacement and stress caused by the transfer from open-pit mining to underground mining in Sanyou Stone Mine is obtained.The results show that the underground mining causes the deformation and settlement of slope and surrounding rock in different degrees.In the process of underground mining,the horizontal displacement of the slope and surrounding rock caused by excavation is small with the increase of the elevation,and the displacement settlement increases with the increase of the elevation.The influence range of underground mining on the slope is within 46 m away from the slope,and the influence range of the surrounding rock on the upper and footer walls of the orebody is within 83 m away from the boundary of the orebody.The displacement change of the north slope caused by excavation is greater than that of the south slope,and the underground mining has a greater impact on the north slope.Underground mining breaks the original stress equilibrium state of the slope and surrounding rock of the orebody,and the stress distribution changes obviously.With the progress of excavation,the bottom of the slope gradually appears failure,and with the increase of excavation depth,the failure area gradually expands.The excavation has a great influence on the surrounding rock of the ore body,the principal stress of the surrounding rock increases with the increase of the excavation depth,and the stress value of the surrounding rock of the ore body is greater than that of the footwall.The influence of excavation on the slope,especially on the top,is small,and the stress concentration area of the slope is distributed at +48m level and the surrounding rock on the hanging wall of the orebody.Excavation causes the concentration of tensile stress at the toe of the slope,the concentration of shear stress at the bottom of the goaf,and the failure occurs at the bottom of the slope when mining reaches-32 m level.Figure 60;Table 22;Reference 62;...