Research On Slope Stability Of Rock Open-pit Mine And Its Three-dimensional Model Early Warning

While open-pit mining brings economic benefits,the stability of slopes and the monitoring and early warning of landslides are also of great significance to mine production.Geological disasters such as landslides are uncontrolled and unpredictable.Solving the key problem of landslide stability and overcoming a single early warning and forecasting method in the past has also plagued the majority of producers.This article takes the slope of Lazizhai Village open-pit mine as the research object.The study area is a high rock slope with faults of different sizes exposed,and the geological conditions are relatively complicated.Therefore,according to the actual situation,the whole research is divided into six blocks for research.First,determine the two potential sliding surfaces in the study area according to the characteristics of the structural planes and the exposure of the drilled cores,and use the limit equilibrium method and the strength reduction method to study the two-dimensional stability of each block based on this;secondly,use the MIDAS software as the study area Establish a three-dimensional numerical model,and perform simulation calculations through the finite difference method,and perform a fitting analysis between the calculation results and the monitoring data;finally,the improved tangent angle method and the rainfall threshold method are used to analyze the displacement and rainfall monitoring data in the study area,and explore at the same time Three-dimensional model early warning process.The main conclusions obtained are as follows:1.Select the limit equilibrium method and the strength reduction method to study the stability of the six study areas.The Bishop method,Morgenstern～Price method,Janbu method and strength reduction method are comprehensively compared,and the stability coefficient calculated by Janbu method is the smallest.And it is concluded that the study area III,IV,and V are not stable,and I,II,and VI are in a stable state.2.According to the drilling data and exploration data,three-dimensional geological models were established for the six study areas and imported into FLAC3 D software for simulation.The calculated displacements are basically consistent with the actual monitoring data,and also echo the stability coefficients mentioned above.3.Based on the monitoring data of small landslides that have been unstable in the study area,the improved tangent angle method and the rainfall threshold method are used as early warning models to obtain the critical early warning value of the study area based on the two early warning methods.