Rock breaking effect of plasma blasting under confining pressure

WANG Yanbing; LI Xue; WANG Zhaoyang; HUANG Zhehang; MEI Hongjia; LI Yangyang; LUO Lin

doi:10.11883/bzycj-2024-0089

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WANG Yanbing, LI Xue, WANG Zhaoyang, HUANG Zhehang, MEI Hongjia, LI Yangyang, LUO Lin. Rock breaking effect of plasma blasting under confining pressure[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0089

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WANG Yanbing, LI Xue, WANG Zhaoyang, HUANG Zhehang, MEI Hongjia, LI Yangyang, LUO Lin. Rock breaking effect of plasma blasting under confining pressure[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0089

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Rock breaking effect of plasma blasting under confining pressure

doi: 10.11883/bzycj-2024-0089

School of Mechanics and Architecture Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

Received Date: 2024-04-01
Rev Recd Date: 2024-08-11

Available Online: 2024-08-13

Abstract

Abstract

Plasma blasting rock breaking technology is characterized by green, high efficiency, controllability, and has a good application prospect in deep rock breaking. In order to provide a new rock-breaking method for the rock-breaking engineering under deep stress, four groups of plasma sandstone blasting tests under different peripheral pressures were carried out. The morphology, structure and distribution of three-dimensional cracks inside the rock were comparatively analyzed by CT scanning and three-dimensional reconstruction, so as to study the effectiveness of the plasma blasting technology in rock breaking under different peripheral pressures. Meanwhile numerical simulation was conducted by using LS-DYNA to establish the plasma equivalent explosive model, supplementing the verification of the role of plasma blasting in the coupled stress field, and investigating the mechanism of plasma blasting under different pressures, as well as the internal crack expansion, distribution and damage evolution laws in the rock body in the blasting process. The results show that under the same voltage, with the increase of the 3D peripheral pressure, the number and distribution range of cracks on the surface of the rock exhibit a trend of gradual reduction, while the complexity of the cracks within the sandstone and the depth of penetration are significantly reduced. Due to the dynamic stress field generated by plasma blasting and the static stress coupling field generated by the surrounding pressure, the shock wave generated by the plasma blasting in the initial stage of the explosion plays a major role for the effect of different pressures under the action of the rock crack morphology and the center of the expansion of the region does not show obvious differences. With the attenuation of the shock wave, the 3D surrounding pressure in the middle and late stages of the plasma blasting process plays a decisive role in inhibiting the cracks of the rock mass expansion and damage evolution. At the same time, with the increase of the surrounding pressure, the more significant inhibition effect on the expansion of cracks in the rock body, resulting in the body fractal dimension and damage degree of 3D cracks in the rock body, while the role of the surrounding pressure approximately follows a linearly decreasing relationship.
- plasma explosion,
- confining pressure,
- crack spatial morphology,
- three-dimensional reconstruction,
- LS-DYNA

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