Study on attenuation law of blasting vibration velocity in rock mass and filling body
Blasting vibration in roadway excavation blasting is an important factor affecting the stability of road-ways and filling bodies.Frequent blasting vibration can cause damage to the surrounding rock of roadways and filling bodies,ultimately leading to instability and failure.By establishing a blasting vibration monitoring system and improving blasting schemes and monitoring positions,the attenuation law of blasting vibration velocity in the rock mass and filling body is studied.The differences in vibration attenuation laws between rock mass and filling body are obtained,thereby optimizing the blasting charge of Jiaojia Gold Mine.The results show that the closer to the blast source,the more pronounced the blasting vibration velocity,which gradually decreases with increasing distance from the blast center.The maximum vibration velocity occurs near the blast source,and blasting in the stope causes greater disturbance and damage to the filling body.The average vibration velocity in the filling body at a distance equal to the explosion point is 0.223 cm/s,greater than the average vibration velocity inside the rock of 0.087 cm/s.Based on the characteristics of blasting vibration velocity propagation in Jiaojia Gold Mine,combined with GB 6722-2023 Blasting Vibration Safety Regulations,the corresponding relationship between the maximum charge for a single section and the safe distance is derived,and a new dynamic stress ratio method is proposed.This not only provides a basis for optimi-zing rock blasting design and blasting charge optimization design but also provides a reliable guarantee for the safe and efficient mining of deep-seated ore deposits in Jiaojia Gold Mine.
万方数据
维普
