Disintegration of rocks based on magnetically isolated high voltage discharge

He, Mengbing; Jiang, Jinbo; Huang, Guoliang; Li, Jun; Li, Chengzu

doi:10.1063/1.4792433

Cited by 28 publications

(8 citation statements)

References 4 publications

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“…Formulas (10) and (12) were substituted into formula (11), and the two sides of the equation were differentiated, resulting in where C is the equivalent capacitance power supply. Its value refers to the current source of the pulse generators that He et al [9] developed. e value of C is 22 μF, and the charge voltage is 10 kV.…”

Section: Establishment Of the Electro-breakdown Modelmentioning

confidence: 99%

“…In the process of EPB, high voltages with short rising edges and high electrical currents are required; however, there is a problematic time delay between the occurrence of the peak voltage and peak current [7,8]. He et al [9] developed pulse generators with both voltage source and current source based on the characteristics of the peak voltage-peak current delay found in the process of electropulse rock breaking.…”

Section: Introductionmentioning

confidence: 99%

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An Electro Breakdown Damage Model for Granite and Simulation of Deep Drilling by High‐Voltage Electropulse Boring

Duan

Tan

et al. 2019

Shock and Vibration

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Electropulse rock breaking has wide application prospects in hard rock drilling and ore breaking. At present, there are no suitable physical mathematical models that describe electropulse boring (EPB) processes under confining pressures. In this paper, a high-voltage electropulse breakdown damage model is established for granite, which includes three submodels. It considers electric field distortions inside the rock, and an electric field distribution coefficient is introduced in the electro-breakdown model. A shock-wave model is also constructed and solved. To simulate the heterogeneity of rocks, EPB rock breaking in deep environments is simulated using the two-dimensional Particle Flow Code (PFC2D) program. The solved shock wave is loaded into the model, and confining pressure is applied by the particle servo method. An artificial viscous boundary is used in the numerical simulation model. Using this approach, a complete numerical simulation of electropulse granite breaking is achieved. Breakdown strength and the influences of physical and mechanical parameters on it are also obtained. Time-varying waveforms of electrical parameters are obtained, and the effect of confining pressure on EPB is also described.

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Section: Establishment Of the Electro-breakdown Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Electro Breakdown Damage Model for Granite and Simulation of Deep Drilling by High‐Voltage Electropulse Boring

Duan

Tan

et al. 2019

Shock and Vibration

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“…In addition, Inoue et al [12], Bluhm et al [13], Biela et al [5], and Vizir et al [14] have developed high-voltage pulse power supplies. He et al [15] developed an improved magnetic switch. Ji et al [16] developed a high-voltage pulse transmission cable.…”

Section: Pulse Power Supplymentioning

confidence: 99%

Influences on High-Voltage Electro Pulse Boring in Granite

Duan

Tan

et al. 2018

Energies

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As the exploration and drilling of oil, natural gas and geothermal wells are expanding continuously, research into high-efficiency rock drilling technology is imperative. High-voltage electro pulse boring (EPB) has the advantages of high rock breaking efficiency and good wall quality, and is a new and efficient potential method of rock breaking. The design of electrode drill bits and the selection of drilling process parameters are the main obstacles restricting the commercialization of EPB. Accordingly, it is necessary to determine the influences on high-voltage EPB. In this study, based on the equivalent circuit of high-voltage electro pulse breakdown, a mathematical model of high-voltage electro pulse discharge in rock is established. Meanwhile, a numerical simulation model of high-voltage EPB of hard granite is established based on a coaxial cylindrical electrode structure, which is often used for electrode drill bits. The simulation analysis software Comsol Multiphysics (Comsol Multiphysics®5.3a, COMSOL Co., Ltd., Stockholm, Sweden) is used to study the influences of granite composition, electrode spacing and electrode shape on the high-voltage EPB process. In addition, the influences of electrical parameters on high-voltage EPB are calculated according to a model of high-voltage electro pulse discharge in rock. Finally, it is demonstrated that high-voltage EPB is influenced by granite composition, electrical parameters, electrode spacing, and electrode shape, and the relationships between these factors are obtained. This study is of guiding significance for improving rock breaking efficiency, reducing energy loss, designing electrode drill bits and selecting drilling process parameters.

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“…Moreover, such treatments are capable of enabling new hard-rock processing methodologies: improving mining eciencies by allowing faster, more precise cutting operations in-place of slower drill & blast mining; and providing remediation for geothermal wells via slotting and cavity formation. As a result, high voltage pulses have also been used for drilling and mining applications [4,5,6,7,8], and in civil engineering demolition and recycling operations [9,3,10]. The e↵ect of high voltages on rock is also of interest in the study of fulgurites -rock formations produced as a result of lightning strikes [11].…”

Section: Introductionmentioning

confidence: 99%

Simulating electropulse fracture of granitic rock

Walsh

Vogler

2020

International Journal of Rock Mechanics and Mining Sciences

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Electropulse treatments employ a series of high-voltage discharges to break rock into small fragments. As these methods are particularly suited to fracturing hard brittle rocks, electropulse treatments can serve to enhance or substitute for more traditional mechanical approaches to drilling and processing of these materials. Nevertheless, while these treatments have the potential to improve hard-rock operations, the coupled electro-mechanical processes responsible for damaging the rock are poorly described. The lack of accurate models for these processes increases the di culty of designing, controlling and optimizing tools that employ electropulse treatments and limits their range of application.This paper describes a new modeling method for studying electropulse treatments in geotechnical operations. The multiphysics model simulates the passage of the pulse, electrical breakdown in the rock, and the mechanical response at the grain-scale. It also accounts for the contributions from di↵erent minerals and porosities, allowing the e↵ect of material composition to be considered. In so doing, it provides a means to investigate the di↵erent physical and operational factors influencing electropulse treatments.

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Disintegration of rocks based on magnetically isolated high voltage discharge

Cited by 28 publications

References 4 publications

An Electro Breakdown Damage Model for Granite and Simulation of Deep Drilling by High‐Voltage Electropulse Boring

An Electro Breakdown Damage Model for Granite and Simulation of Deep Drilling by High‐Voltage Electropulse Boring

Influences on High-Voltage Electro Pulse Boring in Granite

Simulating electropulse fracture of granitic rock

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