Stability Analysis Of An Open Pit Slope In Wulateqianqi

One of the main factors affecting the safety and economic benefits of open pit mines is the stability of open pit slopes.This paper takes the open pit mine of Wulateqian Banner as the engineering research background,analyzes the stability of the mine slope,and proposes corresponding protective measures.The rock mass surrounding rock of the open-pit mine is selected as the experimental material,and the indoor rock acoustic emission experiment is carried out to reveal the rock damage evolution process.On this basis,the slope stability is judged by numerical simulation,and the safety factor of the slope is calculated by the double strength reduction method and the limit equilibrium method to accurately determine the slope stability state.Finally,in view of the future development of the open pit mine and the slope stability problems that may occur in the section,the proposed protective measures are proposed and the feasibility is verified.First,an indoor rock acoustic emission experiment was conducted.The combination of acoustic emission parameters and stress-time analysis shows that the acoustic emission amplitude shows a stepwise increase before the rock failure,and the intermediate process shows intermittent development;the ringing count changes with the release of the elastic deformation energy of the rock.Has a similar change.The elastic deformation can be completely released before the rock is destroyed,and the ringing count reaches the peak at the later stage;the ratio of the cumulative acoustic emission event to the cumulative acoustic emission energy(r value)will be steeply reduced at the moment of rock failure.The above criteria for acoustic emission parameters show significant changes before rock failure,and can be used as precursor information for rock damage to accurately predict rock damage.Secondly,the slope stability is analyzed by numerical simulation.Based on the horizontal displacement cloud map and the vertical displacement cloud map,combined with the maximum principal strain increment and the maximum shear strain increment cloud map,the slope forms a distinct potential slip zone.And the potential shear slip band will get bigger and bigger over time.Through the analysis of displacement cloud map and monitoring point displacement,it is concluded that the displacement of the slope step increases rapidly in the early stage of the simulation test,and the displacement in the late stage of the simulation test reaches the maximum value of about 6 cm.The potential safety factor is obtained from the comprehensive safety factor of the displacement.The slope slip zone has small displacement and good temporary stability.Finally,based on the "minimum reduction path" and "minimum principle" double-strength reduction idea,the safety factor of the slope is 1.274,and the safety factor calculated by the method of comprehensive limit equilibrium is about 1.3.It is concluded that the current open pit slope is in a stable state.Further analysis shows that the current open pit mine continues to be mined 30 meters later,or in parallel mining,the slope will be in an unstable state,so corresponding protective measures are proposed,and the protective measures are proved by displacement analysis and safety factor calculation.feasibility.