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. Highlights: Propose a high-energy gas rock breaking method applied in the field of shallow hole blasting, which is based on an energetic material. CT scanning technology can accurately describe the internal damage of rock mass. Revealed the multi-level interaction of "gas expansion + detonation impact" between high-energy gases and rock masses. [ABSTRACT FROM AUTHOR]