Analysis Of The Stability Of The Dam Body And The Impact Of Blasting Vibration On The Near Quarry

As a major source of risk,the stable operation of tailings is directly related to the normal production and the safety of the surrounding mines.If the open pit is built near it,it is very important to study and evaluate the impact of open-pit blasting vibration on the stability of the dam.In this paper,Liu Jia Pai quarry and adjacent tailings as the engineering background,the bishop has carried on the analysis to the stability of the tailings dam heightening and expansion after all,focus on the analysis of stope blasting safety impact on adjacent tailings dam,and provides a basis for the design of blasting and mining increased tailings.The main research contents and results are as follows:(1)According to the design parameters,an analysis model was established to analyze the slope stability of the main dam,No.1 auxiliary dam,No.2 auxiliary dam and No.3auxiliary dam with the final stacking height of 80 m,and the Bishop method was used.The calculated safety factor of the dam is K = 1.335,the calculated safety factor of the dam is K =1.423,and the calculated safety factor of the dam is K = 1.423 The calculated dam safety factor for the 3# auxiliary dam is K = 1.926.(2)In order to summarize the influence of stope blasting seismic waves on tailings dams and explore the influence of blasting parameters on the stability of tailings dams,a total of 4 blasting tests with different blasting parameters were conducted,combined with the tailings dam As for the force characteristics of space forms,a total of 4 blasting seismic wave monitoring points were arranged to monitor the influence of stope blasting on the stability of the tailings dam.Using the empirical formula of Sadawowski blasting vibration to linearly fit the monitoring data,the empirical formula for the blasting vibration of Sadouovsky in the mine is obtained as follows: The relationship between the amount of blasting agent and the minimum safety distance under different vibration speed control standards is performed.Predictions were made to estimate the safe distance and allowable maximum detonation dose for different vibration speed control standards.(3)The vibration signal of the fourth blasting test is used as the dynamic load signal simulated by the current value,and the power signal is input from the bottom of the model.In order to make the analysis result compared with the existing blasting test,two monitoring points are set at the top of the main dam dynamic analysis model,which are numbered as 1#monitoring point and 2# monitoring point,and the top of the dam after the input of the power signal speed monitoring.Through the analysis of the numerical simulation results,the horizontal radial and horizontal tangential velocity is greater than the vertical velocity,and the dam body is susceptible to shear failure when subjected to blasting vibration.The vibration peak velocity of 1# monitoring point is 5.28mm/s,the peak vibration value of 2# monitoring point is 2.29mm/s,and the maximum vibration point of the crest is 9.00mm/s from the explosion source,which is less than the standard requirements of the safety limit.