Study on the Law of Fracture Development in Plasma-Induced Broken Coal

Li, Yanjun; Lin, Baiquan; Zhang, Xiangliang; Lin, Minghua

doi:10.1007/s00603-023-03315-1

Cited by 7 publications

(2 citation statements)

References 46 publications

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“…In the process of direct rock breaking by high-voltage pulse discharge, only a small portion of the energy stored in the energy-storage device directly acts the rock, while the remaining energy is released in the form of thermal energy, acoustic energy, and other forms thereof. In this study, based on the principle of energy conservation equivalence, the energy released by high-voltage pulse discharge is equivalently substituted and represented by trinitrotoluene (TNT) for energy utilization [31,32].…”

Section: Model and Parametersmentioning

confidence: 99%

“…This study draws from the energy utilization efficiency proposed in that research and uses it to calculate the charge diameter of boreholes under different rock-breaking conditions. For rock solids, the plasma channel generated by electric breakdown in the solid can be regarded as an expanding cylinder, with a length h equal to the length of the cylindrical [31,34,35]. In the present study, TNT was chosen as the explosive energy source and the JWL state equation was adopted to describe the variation of explosion pressure [36], as specified in equation ( 6)…”

Section: Model and Parametersmentioning

confidence: 99%

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Study on fracture characteristics and mechanisms of red sandstone under high-voltage pulse discharge

Hao,

Zhang,

Peng

et al. 2024

J. Phys. D: Appl. Phys.

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To investigate the influences of geometrical size and discharge voltage of the pulse discharge equipment on the fracture characteristics and mechanisms of sandstone under high-voltage pulses, a series of experiments was conducted using a high-voltage pulse discharge device on sandstone circular disc specimens of sandstone with a thickness of 10 mm. These experiments covered a range of disc diameters ranging from 50 mm to 142 mm and discharge voltages from 15 kV to 40 kV. Through these experiments, the fracture characteristics of sandstone at both macroscopic and microscopic levels were investigated. In the experiments, a quantitative analysis of surface fracture was undertaken based on fracture density and fractal damage. Additionally, using the principle of energy equivalence, numerical simulation methods were used to study the damage evolution process in sandstone. The research results indicate that the formation and distribution of fractures in the sandstone specimens are significantly affected by geometrical size and discharge voltage. By analyzing the interaction between stress waves and fracture propagation, combined with indoor experimental results, the fracture mechanism was revealed. The high temperature and shock wave generated by the plasma channel leads to the crushing zone near the electrode, while the circumferential tensile component of the stress wave can result in radial fractures, and the reflected tensile wave leads to circumferential and radial fractures near the boundary.

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Section: Model and Parametersmentioning

confidence: 99%

Section: Model and Parametersmentioning

confidence: 99%