Study on the Dynamic Response and Blasting Mechanisms of Liquid Oxygen/Absorbent Systems

Traditional engineering blasting relies heavily on ammonium nitrate‐based materials, posing inherent environmental and safety risks. Conversely, liquid oxygen (LOX) blasting offers a promising green energetic alternative with environmentally friendly reactants and products. This study systematically investigates the blasting evolution, pressure propagation, and structural influence of five porous LOX absorbents (cotton, EPE, toilet paper, rice husk, and straw) using near‐field explosion pressure tests and high‐speed photography. A three‐stage mechanism model for LOX/absorbent blasting is proposed: phase I (initial excitation stage) establishes local hot spots; phase II (combustion propagation and energy accumulation stage) involves LOX vaporization providing an oxygen‐rich environment while pyrolysis gases accumulate pressure within the confined space; and phase III (explosion stage) occurs when the energy exceeds the confinement threshold, causing the explosive charge to rupture and instantly release all energy. This generates a shock wave peak pressure ( P max ), while the combustion gases mix with vaporized oxygen to form an expanding high‐pressure gas, resulting in a secondary pressure peak ( P 2 ). Furthermore, a four‐dimensional evaluation metric—comprising P max , P 2 , pressure difference (Δ P ), and combustion‐to‐explosion time ( T )—was established. This comprehensive assessment identifies toilet paper as the optimal absorbent, balancing explosive power, and energy efficiency. Finally, the study systematically reveals the blasting mechanism of the LOX/absorbent system as a synergistic blasting process combining the chemical combustion of the absorbent and the physical transient expansion of a high‐energy gas mixture. This research provides a theoretical basis for the parameter optimization and mechanism analysis of LOX blasting technology.