Determination of safety coefficient for predicting blasting vibration velocity

The basic principle of regression analysis was considered for the prediction formula of blasting vibration velocity. On the basis of the considered principle, an opinion was put forward that certain reliability indexes should be chosen according to the safety levels of buildings. And the calculation process was deduced for the safety assurance coefficient included in the prediction formula of blasting vibration velocity. To simplify the calculation process, an empirical calculation formula was proposed for the safety assurance coefficient based on the parameters consisting of amount of monitoring data, correlation coefficient of regression analysis, and reliability index. The accuracy and reliability of the empirical calculation formula was verified by the monitoring data in actual projects. The investigated results show that the empirical calculation formula can meet the practical needs and it can make up the shortcoming that the accuracy of Sadov's formula is not enough. So the empirical calculation formula proposed can provide a reference for the design of safety blasting surrounding important buildings.