Journal of CO2 Utilization (May 2024)
SC-CO2 and emulsion explosives equivalence of rock-breaking effect in granite and mudstone sites
Abstract
How to quantitatively account for the effect of SC-CO2 (Supercritical Carbon) rock-breaking in different rock sites is the key concern in the engineering application of non-explosive rock-breaking technology and economic comparison and there is a lack of experimental basis for relevant studies. Through the equivalent calculation of industrial emulsion explosives, a typical representative granite and mudstone site was selected, and a field experimental program was designed to compare the equivalence of the rock-breaking effects of SC-CO2 and industrial explosives. Based on the rock-breaking equivalent field experiment, we compared and analyzed the rock-breaking area characteristics and parameter changes, such as rock-breaking volume, the morphology of the rock-breaking area, bulk rate, and unit consumption, between SC-CO2 and industrial explosives. A correction of the equivalent conversion formula based on the volume of broken rock was realized. The study shows that SC-CO2 breaks the rock in an elliptical volume shape, the explosives are round, the range of SC-CO2 fracturing breaks the rock is smaller than the range of explosives breaks the rock, and the unit consumption of CO2 is 6–10 times of the unit consumption of explosives. The rock bulk rate is higher after SC-CO2 breaking, while the explosive blast stress wave distribution is uniform, and the bulk rate is low. SC-CO2 rock-breaking produced by the surface vibration velocity is much smaller than the industrial explosives rock-breaking, industrial explosives blasting point of the combined vibration velocity value of the SC-CO2 rock-breaking point of the combined vibration velocity value of 9–11 times, SC-CO2 rock-breaking vibration impact on the surrounding environment is relatively small. The peak combined stress at the measurement point generated by SC-CO2 rock breaking is higher than that of industrial explosives rock breaking, which is 1.2–1.6 times the corresponding measurement point value in the explosives rock breaking test. The study provides an experimental basis for research on the equivalence of SC-CO2 rock-breaking and industrial explosives rock-breaking.
