Abstract
The propagation characteristics of blast waves and the prediction accuracy of blast vibration velocities along negative slopes are important because those can be used to guide engineering application and theoretical research. In this paper, the wave theory was applied to better understand the propagation mechanism of blast waves along negative slopes. Regression analysis was used for the Sadovsky and the CRSRI blast vibration velocity prediction models during on-site operations. The magnification of peak blast vibration velocity along a negative slope was introduced to determine the threshold altitude difference for the magnification effect to occur. Based on this parameter, the relative errors between the two prediction models were compared. The obtained results indicate that the superposition of incident and reflected blast waves on a negative slope creates the “slope effect” which locally amplifies the blast vibration velocity. The relative error of the CRSRI prediction model was as small as 17.53%, demonstrating a greater accuracy than Sadovsky’s prediction model. The magnification effect of a negative slope was observed at specific altitude differences and was more noticeable in the perpendicular direction. This paper creates a theoretical basis for studying the propagation mechanisms of blast vibration waves along negative slopes as well as predicting the blast vibration velocities.
Highlights
Blasting operations usually induce a topographic change within the investigated area. ese modifications decrease the accuracy of the Sadovsky formula which is commonly used for predicting the blast vibration velocity. e slope magnification effect caused by the propagation of blast waves over undulating terrain has become an essential part of studying the propagation of blast vibrations during rock slope excavations [1]
Previous studies focused on the propagation mechanism of blast waves in rock slopes have laid the foundation for an accurate prediction of the blast vibration velocity
Chen et al [2] suggested that the altitude magnification effect is caused by the “whipping effect,” as the main frequency of the blast wave load is equal to the natural vibration frequency of the bench
Summary
E propagation characteristics of blast waves and the prediction accuracy of blast vibration velocities along negative slopes are important because those can be used to guide engineering application and theoretical research. E magnification of peak blast vibration velocity along a negative slope was introduced to determine the threshold altitude difference for the magnification effect to occur. Based on this parameter, the relative errors between the two prediction models were compared. Is paper creates a theoretical basis for studying the propagation mechanisms of blast vibration waves along negative slopes as well as predicting the blast vibration velocities The relative errors between the two prediction models were compared. e obtained results indicate that the superposition of incident and reflected blast waves on a negative slope creates the “slope effect” which locally amplifies the blast vibration velocity. e relative error of the CRSRI prediction model was as small as 17.53%, demonstrating a greater accuracy than Sadovsky’s prediction model. e magnification effect of a negative slope was observed at specific altitude differences and was more noticeable in the perpendicular direction. is paper creates a theoretical basis for studying the propagation mechanisms of blast vibration waves along negative slopes as well as predicting the blast vibration velocities
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