Study On Slope Monitoring And Stability Analysis Of Open Pit In Mubaling

In the process of open-pit mining,various geological disasters such as local collapse and landslide occur from time to time.The safety monitoring and stability analysis of the slope is an important guarantee of mine safety production.Mubaling open pit is located in Anshan Iron and Steel Group Anqian Mining Co.,Ltd.in Qidashan Town,Anshan City.At present,it has entered the deep open pit mining mode.In July 2017,after entering the rainy season,there are slight cracks in the southwest side of mubaling open pit,which may cause potential slope instability.At the same time,as the ore body is composed of amphibolite and phyllite,the two types of rocks are strong.In order to ensure the safe production of the stope,it is necessary to monitor and analyze the slope stability of the open-pit stope.Based on the research project "Research on Key Technologies of open pit safe and accurate mining and intelligent dispatching based on 3S platform" of Angang Group's Angang Mining Co.,Ltd.,taking GNSS and In SAR monitoring data of dumb ridge open pit stope of Angang Group's Angang Group's Angang Mining Co.,Ltd.as data sources,the factors affecting the accuracy of GNSS monitoring data are analyzed,and the data are analyzed through the set threshold.At the same time,the two monitoring methods are compared and analyzed to obtain the deformation results,so as to verify the reliability of the monitoring data.Using the three-dimensional model of stope and the mechanical parameters of slope,the failure mode and stability of slope are analyzed by using the continuum theory and numerical simulation.The paper has achieved the following results:1)In view of the errors caused by ionospheric delay,cycle jump and multi-path effect in GNSS data,the thresholds are set: MP1 < 0.6,MP2 < 1.0,O / SLPS> 500;at the same time,the GNSS online monitoring system of the open-pit stope in mumbaling is completed,and it is found that the Southwest slope of the stope has obvious displacement phenomenon and a large displacement rate.2)The time-series In SAR technology is used to obtain the time-series displacement field of the open pit in mubaling.The slope deformation area is located in the southwest of the stope,with the maximum displacement of nearly 50 mm.The deformation center is near the GNSS monitoring point AG04.3)The stability of section A-A and section B-B is analyzed by using the continuum theory and numerical simulation method.It is revealed that the plastic zone of the left slope of section A-A is a shear failure mode with a safety factor of 0.9.It is proved that the zone has poor stability and is a potential landslide zone,corresponding to the monitoring results of GNSS and In SAR.Although the volume and depth of the plastic zone are relatively small,the safety factor is 1.17,which is at the critical value of slope sliding.It is determined that it will have a certain impact on the overall stability.