Study of slope vibration site effects and energy analysis from CO₂ static blasting

Abstract

The novel CO₂ static blasting method offered good prospects for application as it was more effective than mechanical rock breaking, less vibratory, less dusty and quieter than the traditional drill and blast method. We carried out both true triaxial CO₂ static blasting fracturing experiments and rock-breaking site vibration monitoring experiments to extract vibration signal characteristics, focusing on slope safety. The results show that: 1) the peak vibration velocity of CO₂ static blasting decayed rapidly and dropped below 30 mm/s at 6 m; 2) the principal frequency of the vibration waveform spectrum caused by CO₂ static blasting was higher than that of the drill-and-blast method; 3) the vibration velocity prediction formula used in the drill-and-blast method was applicable to CO₂ static blasting, and the prediction formula with elevation was more accurate. An HIG fracturing model for CO₂ static blasting is proposed, which provides a basic framework for research of new rock-breaking techniques. The vibration displacement of the slope under CO₂ static blasting is minimal, and more attention should be paid to the exothermic and temperature measurement of the polyenergy agent in the future.

Keywords

rock-breaking technology / CO₂ static blasting / vibration speed / fracturing mechanism / energy calculation

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