关键词: 爆破振动, 逐步回归算法, 振动幅值, 比药量, 主频, 高程放大率

Abstract: In order to study the variations of physical variables affecting the blasting effect in the process of slope throw blasting, we functionized all variables in the Sadaovsk formula considering the influence of elevation and modified the factor function by multivariate regression fitting to determine the functional relationship. Subsequently we conducted stepwise regression analysis of Sadaovsk formula and gave the value of correlation coefficient. Results evinced that unit volume of single-hole blasting is the dominant factor of the explosive charge function. When the line of least resistance is over 2.0 m, the influence of other factors is below 10%. The critical elevation difference for elevation amplification effect is about 38 m. In addition, the main vibration frequency exhibited a decreasing trend with the increase of the horizontal distance R when the specific charge ρ is a fixed value; so did it when the explosive charge Q is a fixed value, and the deceleration rate reduced gradually. When R is a fixed value, the main vibration frequency declined also with the rising of Q, and such deceleration attenuated gradually. The research findings could be utilized to mitigating the vibration of surrounding buildings generated by slope blasting and to ensuring the final stability of slope.

Key words: blasting vibration, stepwise regression algorithm, vibration amplitude, scale charge, dominant frequency, elevation amplification