Influences on High-Voltage Electro Pulse Boring in Granite

Li, Changping; Duan, Long Chen; Tan, Songcheng; Chikhotkin, Victor

doi:10.3390/en11092461

Cited by 38 publications

(24 citation statements)

References 23 publications

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“…The first part of the calculation models the passage of the electric pulse through the rock body. As in other high voltage studies [22,23,24], we assume that the electrical discharge can be modeled as a quasi-static process where the current per unit area, J i , is related to the electric field E i by Ohm's law:…”

Section: Model Descriptionmentioning

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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Section: Model Descriptionmentioning

confidence: 99%

Simulating electropulse fracture of granitic rock

Walsh

Vogler

2020

International Journal of Rock Mechanics and Mining Sciences

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“…High Voltage DC Charging Power Supply Marx Generator The equivalent circuit of rock breakdown using high-voltage electro pulse discharge is a typical RLC discharge circuit [28], as shown in Figure 3. The circuit resistance Rz includes the The equivalent circuit of rock breakdown using high-voltage electro pulse discharge is a typical RLC discharge circuit [28], as shown in Figure 3. The circuit resistance R z includes the resistance of capacitors, connecting wires, and the high-voltage pulse switch.…”

Section: The Shockwave Model Of High-voltage Epb In Granitementioning

confidence: 99%

Damage Model and Numerical Experiment of High-Voltage Electro Pulse Boring in Granite

Duan

Tan

et al. 2019

Energies

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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 EPB process is defined as random because it is affected by many factors. At present, there is no suitable physical and mathematical model to describe the process and results of rock breakage in EPB, and the conclusions reached regarding rock-breakage mechanisms are not uniform. In this study, a complete damage model of high voltage EPB in granite is established, which includes a shock wave model and a damage model of high voltage EPB in granite. The damage model is based on the Particle Flow Code two-dimensional program. Use of a damage model of EPB accommodates the complete process of high voltage EPB, from discharge to production of a shock wave, and so rock-breaking via electro pulse can be simulated and calculated. The time-varying waveforms of shock waves with different electrical parameters are simulated and calculated on the basis of the model. Different shock wave forms are loaded into the surface and internal rock in the damage geometric model of EPB granite. Then, the breakage process of the rock surface and internally, and the mechanism of rock breakage using EPB are analyzed. This study provides a scientific basis for the quantitative expression and prediction of rock fragmentation in EPB in order to improve the drilling efficiency and reduction of energy loss in the process of EPB.

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“…where v td � πr 2 l td , r is the radius of the plasma channel (�10 μm) [17], E is the electric field strength vector of the hole at the end of the plasma channel, D is the displacement vector where D � E ε 0 ε r , ε 0 is the vacuum dielectric constant (�8.85 × 10 − 12 F/m), and ε r is the relative dielectric constant of granite (�8.3) [15]. e electromechanical energy W em in the channel can be expressed as…”

Section: Establishment Of the Electro-breakdown Modelmentioning

confidence: 99%

“…Here, σ is the Maxwell stress, which can be expressed as σ � ε 0 ε r E 2 /2, and γ is the strain, where γ � σ/E t . E t is the elastic modulus of granite (�4.8 × 10 4 MPa) [15]. e total…”

Section: Establishment Of the Electro-breakdown Modelmentioning

confidence: 99%

“…Currently, there are no models of rock fragmentation during EPB in deep wells [3,13]. In their research into high-voltage electro-pulse rock breaking models, Andres et al [14] and Li et al [15] established models of electric field distributions in composite media. e effects of electro-pulse rock breaking were obtained indirectly based on electric field distributions in rock.…”

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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Influences on High-Voltage Electro Pulse Boring in Granite

Cited by 38 publications

References 23 publications

Simulating electropulse fracture of granitic rock

Simulating electropulse fracture of granitic rock

Damage Model and Numerical Experiment of High-Voltage Electro Pulse Boring in Granite

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

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