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| Research on the damage and fracture characteristics of red sandstone under the coupling effect of triaxial confining pressure and liquid oxygen blasting load |
| WANG Yanbing1, ZHANG Fangping1, LI Shouye2,3, PENG Huichun4, LEI Zhen5
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1. School of Mechanics and Civil Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China;
2. Zijin Mining Group Co., Ltd., Shanghang 364024, Fujian, China;
3. Xinjiang Zijin Zinc Industry Co., Ltd., Uqia 845450, Xinjiang, China;
4. China Gezhouba Group No.3 Engineering Co., Ltd., Xi'an 710077, Shaanxi, China;
5. Guizhou Institute of Technology, Guiyang 550025, Guizhou, China |
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Abstract To address the deficiencies in the theoretical analysis of confining pressure coupling effects in liquid oxygen blasting technology, field experiments and LS-DYNA numerical simulations were combined. A hydraulic true triaxial loading system was employed to systematically investigate the damage evolution patterns of red sandstone specimens. The results demonstrated that blasting effectiveness was significantly influenced by confining pressure. Under unconfined conditions, cracks were elongated and dispersed. As confining pressure was increased, crack propagation was suppressed, blasting energy was concentrated, crack directions were clarified, and crack quantities were reduced. The funnel effect at specimen bases was affected by multiple factors, and geometric parameters were altered by confining pressure. Strain peaks were correlated with failure phenomena, and strain growth was inhibited under elevated confining pressures. Through numerical simulations, stress and damage evolution in rock masses were further revealed. Confining pressure was shown to suppress damage propagation, reduce peak energy concentrations around boreholes, and slow energy attenuation. This study elucidated the critical regulatory role of confining pressure on damage-fracture characteristics in liquid oxygen blasting, providing theoretical foundations and practical references for blasting in deep high-stress rock masses.
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Published: 19 September 2025
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