Spread Regularity Of Blasting Vibration On The Slope And The Influence On Slope Stability

The research on the influence of blasting vibration on the slope stability has been a hot topic in many countries.The blasting vibration will greatly reduce the stability of the slope,and the stability of the slope directly affects the normal production of the work site,the safety of the equipment and the economic benefits of the enterprise.Therefore,it is of great significance to study the propagation law of blasting vibration on the slope,and to better understand the influence of blasting vibration on the slope stability.This paper combined the method of physical simulation test and the field test to study the law of vibration velocity of different types of slope,and according to the measured data,had a stability analysis in the static and dynamic state for the slope.The main research results are as follows:(1)Propagation law of blasting vibration on slope.Through Stepped slope and line slope's simulation test of blasting vibration show that: on the same platform,the blasting vibration velocity is decreasing from the step edge to step root,and velocity decay rate is also decreasing from the step edge to step root;on the top and bottom of the same bench,the velocity of the top of the slope relatives to the velocity of the bottom of the slope will increase or decline slow;linear slope vibration velocity attenuation is gentle.(2)Prediction of blasting vibration velocity.When predicting the velocity of root measuring point of the step,the prediction of accuravy is the highest;when predicting the velocity of root and middle measuring point of step,the prediction accuracy will reduce;when predicting all the measuring points,the prediction accuracy is the lowest because the vibration velocity at the edge of the bench will suddenly increase.(3)Study on amplification effect of blasting vibration.The magnification factor of the stepped slope increases with the increase of the s lope angle and the final slope angle,at the top edge the blasting vibration velocity of the linear slope will enlarge.(4)Stability analysis of slope.The stability anal ysis results of Mianyang science and Technology City Avenue Industrial Park No.1 road cutting slope shows that,the step is stable in static and dynamic state but with the increase of slope series stability coefficient will decrease;the loss of the stability coefficient of slope in blasting vibration under the action of the slope increases with increasing trend series.The stability coefficient of slope under blasting vibration is lower than that under static load 5.95%;the loss coefficient of slope stability increases with the increase of slope series.