Study Of Blasting Vibration Monitoring And Controling In An Open Stope

Blasting vibration is a key to Zhanggou stope. On the basis of the study of bench blasting seismic monitoring home and abroad, This thesis, by means of vertical velocity of blasting seismic wave, analyses 89 groups monitoring data of 13 site bench blasting by use of statistics and regression, concludes the rule of blasting seismic wave spreading and attenuation and gains the experiential values of K and a . The regression correlation coefficient value of the formula, which has high correlation grade, is 0.916. Taking buildings around the stope into account, the thesis chooses the nearest building, which has the lowest structural intensity, as the study object. Referring to relation between damage criterions and blasting main frequency to normal building stated in Regulations of Blasting Safety, 0.3cm/s is taken as the concessional blasting seismic velocity to normal buildings nearby. Comparing to former 2 holes or 3 holes primed in one section, single hole blasting or millisecond blasting in one hole can make the ratio of vibration reduction to 48.90~60.67%. At the same time, strictly controlling sectional charge is summarized as the most effective method to reduce blasting seismic and table of relationbetween permissible sectional charge [Q] and distance of normal building to charge R is set down, which can be used to guide the construction. Spacing charging at blast hole bottom is studied to reduce the seismic, which can make the ratio of vibration reduction to 10-15% and reduce the ratio of boulder and root as accessorial method. Practice has proved that the methods can protect the normal buildings nearby and provide the production. The valuable reference has been provided for similar engineering of bench millisecond blasting in open stope.Name: Xing Dongsheng (Mining Engineering) Directed by: Chen Shouru...