Electric pulse breakdown and rock fracture in a coupled environment of increased pressure and temperature

Vazhov, V. F.; Datskvich, S Yu; Zhurkov, M. Yu.; Muratov, V. M.

doi:10.1088/1742-6596/552/1/012050

Cited by 9 publications

(6 citation statements)

References 1 publication

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“…According to the revised electro-breakdown field strength formula and the physical and mechanical parameters of granite, the electro-breakdown field strength of granite under normal temperature and pressure was calculated as 115.2 kV/cm. is value has the same order of magnitude as the experimental results of Vazhov et al [44] and Lisitsyn et al [45]. e tested electro-breakdown field strength of granite was 100-150 kV/cm.…”

Section: Numerical Calculation Of Electro-pulse Breakdownsupporting

confidence: 72%

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: Numerical Calculation Of Electro-pulse Breakdownsupporting

confidence: 72%

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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“…Additionally, the process enables more complex drill patterns, such as perpendicular drilling and cutting, that are notoriously di cult to achieve with conventional rotary-head drilling [16]. Several studies have conducted drilling operations with electropulse methods [17,16,15], or performed separate investigations of the mechanisms underlying disintegration of the solid material [4,12,9]. Budenstein [12] performed experiments indicating the development of a gaseous channel through the solid material during breakdown.…”

Section: Introductionmentioning

confidence: 99%

“…Disintegration of the solid material itself is induced by the expansion of the gas channels and minerals due to high temperature and pressure. From the solid's perspective, the rapid expansion of streamer channels causes stress perturbations that exceed the tensile strength of the material [5,17,18,16]. Lisitsyn et al [9] describe the rock disintegration process as expansion of vapor-gas cavities in the solid material during breakdown, which then leads to a pressure wave through the solid material.…”

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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“…Nonetheless, experimental results by Vazhov et al [73] and Anders et al [13] showed that a plasma is indeed generated within pressurized samples, implying that plasma formation still occurs at greater lithostatic pressures, associated with greater depths. Additionally, these experimental results show that a higher fragmentation specific energy (energy/volume) is required at greater depths.…”

Section: Pore Voltage and The Paschen Curvementioning

confidence: 99%

Simulating Plasma Formation in Pores under Short Electric Pulses for Plasma Pulse Geo Drilling (PPGD)

et al. 2021

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Plasma Pulse Geo Drilling (PPGD) is a contact-less drilling technique, where an electric discharge across a rock sample causes the rock to fracture. Experimental results have shown PPGD drilling operations are successful if certain electrode spacings, pulse voltages, and pulse rise times are given. However, the underlying physics of the electric breakdown within the rock, which cause damage in the process, are still poorly understood. This study presents a novel methodology to numerically study plasma generation for electric pulses between 200 and 500 kV in rock pores with a width between 10 and 100 μm. We further investigate whether the pressure increase, induced by the plasma generation, is sufficient to cause rock fracturing, which is indicative of the onset of drilling success. We find that rock fracturing occurs in simulations with a 100 μm pore size and an imposed pulse voltage of approximately 400 kV. Furthermore, pulses with voltages lower than 400 kV induce damage near the electrodes, which expands from pulse to pulse, and eventually, rock fracturing occurs. Additionally, we find that the likelihood for fracturing increases with increasing pore voltage drop, which increases with pore size, electric pulse voltage, and rock effective relative permittivity while being inversely proportional to the rock porosity and pulse rise time.

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Electric pulse breakdown and rock fracture in a coupled environment of increased pressure and temperature

Cited by 9 publications

References 1 publication

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

Simulating electropulse fracture of granitic rock

Simulating Plasma Formation in Pores under Short Electric Pulses for Plasma Pulse Geo Drilling (PPGD)

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