Research On The Final Slope Angle Optimization Of An Open-pit Limestone Mine In Shangri-La

With the development of the “Belt and Road” initiative and the construction of a number of major projects,open-pit mining technology has also developed rapidly,which has increased the demand for stone materials,and therefore the potential safety hazards of slopes are also increasing.The final slope angle of the slope will change with the height of the slope,and the size of the final slope angle will cause changes in the stripping ratio of the mine,which in turn will affect the mine's direct economic benefits,and most importantly,it will affect To the safety and stability of the entire mine.Therefore,it is very important to determine the final slope angle of an open-pit mine stope,not only to make the open-pit mining process safe and effective,but also to optimize the economic benefits of the mining enterprise.This is also the most important problem in the current open-pit mining process..This paper takes an open-pit limestone mine in Shangri-La as the research object.Through the study and analysis of the slope stability of the stope,the final slope angle is analyzed and optimized,and certain results have been obtained in the end.1.The on-site survey of the slope of the mine stope obtained the samples needed for the test and the hydrogeological conditions of the mining area were investigated;secondly,the various petrological parameters of the limestone ore were obtained through the indoor mechanical tests on the samples,and Using the Hawke Brown formula method to reduce various rock parameters obtained in the experiment,the final mechanical parameters of the slope rock mass are obtained,which mainly include: rock bulk density,uniaxial compression,tensile strength,cohesion,elastic modulus,etc.;2.Using FLAC3D numerical simulation software to analyze the original slope of the mine and the original design mining plan,analyze the slope mainly from the aspects of displacement,stress,strain,etc.,and obtain the original slope and original slope.The stability of the design scheme has laid a certain foundation for the final slope angle optimization study;seven mining schemes are designed according to the final slope angle influence factor,and the safety factor of each scheme is calculated using the limit balance method.The calculation will not meet the requirements.Conditional schemes two,three,and five are excluded;3.The CRITIC-TOPSIS index evaluation method was used to evaluate and select options 1,4,6,and 7,and finally the best option was obtained as option 4.The displacement,stress,and strain analysis and verification of option 4 were obtained using FLAC3 D.This scheme has good stability.Compared with the original design,the final slope angle is increased by 6 degrees under the condition of ensuring the stability of the slope,so that more ore can be collected in the stope,which brings higher profits to the enterprise and the slope still has good stability.