The Research Of Influence On Blasting Vibration To The Stability Of High Slope In Jin Dui Cheng Open-pit Mine

The stability of open-pit slope affect the equipment and man in normal mine production. Producing blasting and siding blasting largely affect the stability of slope. Blasting vibration will produce slope backlash loosening and cracking or caving. So it is very important to research the influence of blasting vibration to slope stability and introduce feasible reducing-vibration measures.In this paper the author took the high slope of Jin Dui Cheng open-pit mine as research object and analyzed the influence of production blasting to the stability of the slope in Jin Dui Cheng open-pit mine. The main achievements included:Through blasting vibration tests and monitoring on present, the author concluded the blasting vibration propagation and attenuation regularity about four side slopes in Jin Dui Cheng open-pit mine. From the research of the statistics analysis to the test data, some characteristics about the velocity of blasting vibration , the mainly frequency character of blasting vibration and duration of blasting vibration were obtained. Using two factor linear regress analyzing principle, the author analyzed the amplification effect about blasting vibration, moreover, contrasted with the results using one factor linear regress analyzing principle. To the detonation technology of hole-by-hole, author studied the effect of reducing blasting shaking, and then contrasted to the common millisecond blasting technology.Using one of the Limit equilibrium analysis methods-Sarma method, author calculated the stability of the slopes. Through caculating, we can find that the east slope is more stable than the north slope. Taking blasting vibration into account, coefficient of stability will drop about 13 % while siding blasting. Combined the operations of the blasting vibration and ground water, coefficient of stability will degrade about 16 %.Adopted WRM-3 type hole displacement apparatus, the inside-body displacement of slope rock was monitored. Monitoring result indicates that because of the oppressing influence of the structure stress and the effection of blasting vibration, the slope rock body moves into the open-pit.Aimed at the conditions of Jin Dui Cheng open-pit mine, author gave somehelpful suggestion on blasting technology. Combined the actuality existing in open mine, some effective measures were advanced to protect the slope, such as presplititng blasting and popularizing the hole-by-hole detonation technology in all the open-pit mine.