Research and Application of High-Energy Gas Fracturing Mechanism Based on CT Scanning Technology

A high-energy gas rock-breaking material and method suitable for shallow hole blasting has been proposed. The rock-breaking principle and law of high-energy gas were analyzed through laboratory rock-breaking experiments combined with CT scanning and three-dimensional reconstruction technology. The results showed that the specimen after the action of high-energy gas was broken evenly and the energy utilization rate was high. However, with the increase in the dosage, energy would be wasted and the rock would be over-crushed. According to the analysis of the deflagration pressure curve of high-energy powder, the action process of high-energy gas could be roughly divided into four stages: crack initiation, high-speed expansion, low-speed expansion, and pressure reduction. At the same time, the multi-level interaction mechanism of “gas expansion + detonation impact” between high-energy gas and rock mass was proposed. Finally, the superior rock-breaking effect of high-energy gas was verified through engineering application, which provides scientific guidance for the later scheme optimization.