Numerical simulation of topographic propagation law of vibration wave in liquid carbon dioxide phase transition...

Compared to the high-risk hazards of explosive blasting, liquid carbon dioxide phase transition fracturing technology, as a new technology, can be used as a supplementary method that is not suitable for explosive blasting sites. Liquid carbon dioxide phase transition fracturing blasting is different from explosive blasting; for the application of liquid carbon dioxide phase transition fracturing blasting in the process of rock excavation, there is still a lack of research on the vibration effect of terrain on the topographic propagation law of vibration wave, so it is of certain significance to study the vibration wave propagation rule of liquid carbon dioxide phase transition fracturing blasting under different terrain conditions. The study on the terrain propagation law of vibration waves in liquid carbon dioxide phase change fracturing blasting was carried out. Firstly, the field CO₂ blasting tests and PPV measurements are described, and the applicability of UDEC software to blasting analysis and the determination of the load for liquid carbon dioxide phase change fracturing blasting were introduced. Then, the selection of physical and mechanical parameters, viscous boundary conditions, and damping for the site rock mass was elaborated in detail. Finally, the numerical models are established for liquid carbon dioxide phase transition fracturing blasting in flat, concave, convex, and slope terrain. The influence laws of flat, concave, convex, and slope terrain on the peak particle velocity of liquid carbon dioxide phase transition fracturing blasting are obtained. In actual CO₂ blasting sites, the safe PPV vibration control standards can be proposed based on different terrain by applying the proposed terrain prediction formula, solving the challenge of quantitatively analyzing the terrain effects of CO₂ blasting. The research results have certain guiding significance for predicting the peak particle velocity in advance and controlling the vibration effect of high-pressure carbon dioxide fracturing blasting.