Study On The Stability Of Clay Dam Of Tailings Pond Under Blasting Vibration

Tailings reservoir is one of the major sources of danger in the mine,and once it bursts the dam it will have serious consequences for the people,property and ecology downstream.Especially when the tailings reservoir is near the open-air quarry,the blasting vibration of the quarry is very important to the analysis and study of the stability of the tailings reservoir.Based on the engineering background of the influence of open-air blasting on the stability of clay dam of tailing pond in Jifa quarry,Nieqiao Town,De'an County,this paper analyzes the stability of clay dam by means of on-site blasting vibration monitoring,blasting vibration signal analysis and numerical simulation.The main research contents and achievements are as follows:?1?Under the influence of no blast vibration,the stability of tailings dam under different operating conditions is analyzed and calculated by swedish arc method and simplified Bishop method,and the result ingestion results show that the minimum safety coefficient calculated is higher than the specification value requirement,and the tailings dam is now in a stable state.?2?Under the influence of blasting vibration,the blasting vibration monitoring test is carried out in order to find out the degree of influence of each blasting parameter on the stability of the clay dam.Four monitoring points were arranged at the top of the clay dam to collect the monitoring data of the effect of blasting vibration on the stability of the clay dam.By fitting the monitoring data,the empirical formula of blasting vibration suitable for the mine is:V=203.56?³?Q?R?^1.7797,and then using the formula to predict and estimate the relationship between the explosive quantity and the minimum safety distance under different vibration speed control standards,it is found that the stability of clay dam will not be affected.?3?The original vibration detection signal was used to de-noise the original vibration signal by using three methods:wavelet packet,EEMD and EEMD-smallwave packet.The de-noise processing of the original vibration signal is performed using three de-noise methods,smallwave packet,EEMD and EEMD-smallwave packet.The EEMD-smallwave packet denoise method is better than the other two methods in this experiment.HHT time frequency analysis of the de-noiseed signal and found that the energy is concentrated in the 0-40Hz range.With the increase of the burst heart distance and Maximum explosive mass in a single segment,the energy main vibration frequency develops to low frequency,and the main vibration frequency of the blast vibration signal is about 10Hz.Moreover,the main vibration frequency of vibration velocity of some measuring points already belongs to the natural seismic frequency range?3-10Hz?,which can be used to determine the safety of tailings dam by using the seismic specification analogy of the tailings dam.?4?The numerical modeling of the clay dam is carried out,and the monitoring points are set at the same location as the measuring points of the dam body to monitor the speed and displacement of each point.The blasting load signal is introduced vertically from the bottom,the maximum total displacement of the monitoring point is 3.5*10^-4m,and the maximum speed is 8.54mm/s is much less than the specification value,indicating that the blasting vibration effect will not affect the stability of the clay dam under certain production conditions in the quarry.