Study On Stability Of Fault-bearing Rock Slope In Dongbang Of Manjiazhai Open-pit Mine

With the continuous mining of open pit mine,the formation of the slope height is bigger,the engineering geological conditions and mining area is relatively complex,the slope stability problem in the mining process has become increasingly prominent.Especially the fault fracture zone is found in most of the open pit mine.,the fault fracture zone severely reduces the stability of slope,the deformation failure mechanism and stability of the slope body problems become very complex,for mine personnel and safe production to produce a lot of harm.In wenshan,home village east open pit mine to help contain the fault rock slope as the research background,through in-depth analysis of the slope engineering geological conditions,using a combination of theoretical analysis and numerical simulation,to contain the large fault rock high slope deformation and failure characteristics and to study the buckling characteristics in the process of excavation,the study on reinforcement of prestressed anchor cable of instability of slope.1.Through the study of rock mass structures and geological structure,the fault is the main influencing factors of slope stability;Controlled by the fault effect,under the action of external disadvantage,slope had been generated along a fault plane landslide body,at the same time corresponding potential landslide slope model is given.2.According to home village east slope in the exploration of the chart,by FLAC3D numerical simulation model is established,the analysis on the fault control under the action of different slope Angle of four kinds of mining scheme,the displacement field and stress field of the slope body changes regularly.3.Prestressed anchor cable reinforcement was studied for the unstable slope,the results show that the prestressed anchor rope to the stability of rock slope containing fault has a lot to ascend.4.Combining orthogonal experiment and numerical simulation,the thickness of fault,fault dip Angle,fault cohesive force,internal friction Angle of fault and fault outcrop of the distance from slope five factors were analyzed.Finally,the simulation results of multi-factor variance and correlation analysis,it is concluded that the dominant factors influencing the slope stability and correlation factors.5.Fault "activation" theory is introduced into the slope deformation failure mechanism,through to the instability of the slope displacement field and stress change rule of the detailed analysis,obtained under different excavation steps fault deforamation damage area and reach.Come out the results and fault "activation"theory calculation results are consistent:Mohr-coulomb criterion suitable for as the basis of fault activation.