Study On The Slope Stability Of The No. 3 Open-pit Mine Of Tianning Phosphorus Mine

For open-pit mining activities,the stability of industrial sites has always been very important,especially with the increasing height and slope of open-pit mining slope,production activities are increasingly frequent,and the stability of high and steep open-pit slope is particularly important.In this paper,the object of analysis and evaluation of open-pit slope is delineated,the basic physical and mechanical properties of the slope are measured and tested,the stability analysis methods of open-pit slope at home and abroad,the influencing factors and mechanism of open-pit slope stability,the mechanism of slope instability and the stability analysis and Simulation of open-pit slope are analyzed,and the stability of the slope is finally obtained.The basic principle and analysis method of influencing factors are studied.Midas GTS numerical simulation software based on finite element strength reduction method is used to analyze the influence of heavy rainfall and vibration on slope stability.It is found that for Open-pit slopes in the study area,although heavy rainfall and blasting vibration may have an impact on slope stability,the impact is within acceptable range and will not affect slope stability.Sex has a substantial impact.Specific research contents are as follows:According to the occurrence conditions of ore bodies,ore body burial,resource reserves and ore grade,the restrictive conditions of open-pit boundary in different mining sections are analyzed,and the optimum delineation of open-pit boundary is carried out according to the contribution value of different restrictive conditions.The basic physical and mechanical properties of core and other samples of open-pit slope were tested,and the basic rock physical and mechanical parameters such as bulk density,compressive strength,tensile strength,internal friction angle and cohesion were obtained.Then the above parameters were reduced in accordance with the basic principles of finite element method,which provided basic input parameters for numerical simulation analysis.The stability of open-pit slope under natural condition,heavy rainfall condition and earthquake condition is analyzed,and the slope safety factors under three conditions are obtained.The analysis shows that heavy rainfall and earthquake have no effect on the stability of open-pit slope.In the end,the basic evaluation of the test and numerical simulation results is carried out.It is considered that the No.3 mining area can maintain good stability under natural conditions,rainstorm conditions and earthquake conditions,and meet the requirements of excavation safety because of its good stratum conditions and high strength of surrounding rock.The calculation results show that the northwest side slope of No.3 mining area is the area with the lowest stability of the whole mining area,and it is most prone to collapse and landslide.At the same time,the northeast side also has a greater risk of landslide.At the same time,some suggestions are put forward for this side.