Influence Of Bench Blasting And Hanging Wall Mining On Stability Of High And Steep Slope

Open pit blasting and hanging gang mining jointly affect the slope stability of open pit mines,and with the increase of mining age,open pit mines have also entered the deep mining stage,and the number of high and steep slopes is also increasing.Under the joint influence of blasting vibration and hanging gang mine,the slope with low stability is extremely prone to disasters such as collapse and landslide,which seriously threatens the safe production of the mine.In this thesis,a pit mine in Inner Mongolia is mined under the joint influence of blasting vibration and hanging gang mine as the engineering research background,and the stability of the high and steep slope of the mine under the action of blasting vibration is simulated by using numerical simulation analysis methods to use numerical simulation analysis methods to analyze the stability of the high and steep slope of the mine under the action of blasting vibration,and to simulate the mining of the hanging gang mine that is not affected by the vibration and the mining application model of the hanging gang mine that is affected by the vibration,and gives corresponding engineering suggestions for the safe mining of the mine.Provides an example for analyzing the stability of high and steep slopes in other open pit mines.By consulting the geological data of the open-pit mine,the hydrogeological situation and slope engineering geology of the mine are determined,and certain physical properties experiments are carried out by measuring the slope step samples of the mine collected in the laboratory,so as to determine the mechanical properties of the ore,and finally use it as the input parameters for establishing the model,in order to better study the slope stability of the mine.Through the determination of all aspects of parameters,it is proved that the slope of the north gang of the mine is stable,the rock mechanical strength is high,and the number of unfavorable structural surfaces is small.The site monitoring of the mine by the boundary blasting site,the measured maximum peak vibration speed of the boundary blasting is fitted by the least squares method,and the horizontal radial,horizontal tangential and vertical Sadowski blasting vibration velocity attenuation equations of the corresponding slope are obtained;and after determining the blasting process by helping the blasting process,the maximum single-stage detonation dose of pre-cracking explosion is obtained according to the safety allowed particle vibration rate of the blasting vibration,so as to guide the mine blasting and mining control.After simplifying the analysis of the slope parameters of the north of the mine,a model is established,and the stability of the slope under self-weight conditions is determined,the stress strain displacement analysis is determined,and the location of the maximum displacement amount is determined.The slope strength reduction method is used to determine that the safety factor is about 1.2 under the condition of self-weight,the slope stability is good,the simulated slip displacement is about 2.8cm,and the filling method is used to mine the hanging gang ore block that is deposited at the level of 1188 m in the north gang,the safety factor after mining is about 1.12,and the displacement increment becomes about 3.5cm after the blasting load is applied.After the slope is applied to the equivalent blasting load,the slope slip is further increased,and it is concluded that under the joint influence of the step help blasting and hanging help ore,the slope slip resistance is reduced and the stability is reduced.