Electropulse technology of material destruction and boring

Boev, S.G.; Vajov, V. F.; Levchenko, B.; Jgun, D.; Muratov, V. M.; Pel'tsman, S. S.; Adam, A. M.; Uemura, Keiji

doi:10.1109/ppc.1997.679311

Cited by 28 publications

(30 citation statements)

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“…According to the numerical calculation of the plasma channel radius waveform (Figure 8c) and plasma channel expansion shockwave waveform (Figure 8d), it was found that the energy efficiency of the generator energy transformation into wave energy was about 10%. This conclusion is consistent with the conclusion that the energy efficiency of the generator energy transformation into wave energy was 10% to 20% from the breaking prediction model of electric blasting [8]. For a different insulating dielectric between electrodes and fragmented object, conversion efficiency and the correlation coefficients, such as resistance coefficient, are different [15].…”

Section: The Numerical Solution and Discussion Of The High-voltage Epsupporting

confidence: 88%

“…The main effect on the conversion efficiency is the equal entropy index. The high temperature of over 3 × 10 4 K [8] in the plasma channel results in a lower equal entropy index. At this time, most of the energy injected into the plasma channel was used for the formation and maintenance of the plasma channel, and a small part of the energy was converted into shockwave energy.…”

Section: The Numerical Solution and Discussion Of The High-voltage Epmentioning

confidence: 99%

“…For a different insulating dielectric between electrodes and fragmented object, conversion efficiency and the correlation coefficients, such as resistance coefficient, are different [15].The main effect on the conversion efficiency is the equal entropy index. The high temperature of over 3 × 10 4 K [8] in the plasma channel results in a lower equal entropy index. At this time, most of the energy injected into the plasma channel was used for the formation and maintenance of the plasma channel, and a small part of the energy was converted into shockwave energy.…”

Section: The Numerical Solution and Discussion Of The High-voltage Epmentioning

confidence: 99%

“…That is to say, the internal force that is produced by the release of strain energy during a high voltage pulse discharge leads to quasi-static, multi-crack fragmentation. Boev et al [8] pointed out that although many previous scholars have made efforts to explain the principles of plasma channel discharge in rock breaking, there is no suitable physical and mathematical model to describe the breaking process and results. Andres et al [9] established and analyzed the electric field distribution model of rock breaking.…”

Section: Review Of Previous Studies On Mechanical Model and Breakage mentioning

confidence: 99%

“…The scientific community has extensively studied the breaking process of high-voltage pulse rock breaking. Boev et al [8], Lisitsyn et al [5,18], Kurets et al [19], Cho et al [4], Andres et al [20], Zuo et al [21], Yan et al [22], Sang et al [23], and others have used high-speed video cameras to photograph the breaking process in the experimental process. An X-ray CT system and electron microscopy scanning were used to observe the plasma channel inside the rock, and the distribution of fracture crack.…”

Section: Rock Breaking Process Of High Voltage Epbmentioning

confidence: 99%

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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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Section: The Numerical Solution and Discussion Of The High-voltage Epsupporting

confidence: 88%

Section: The Numerical Solution and Discussion Of The High-voltage Epmentioning

confidence: 99%

Section: The Numerical Solution and Discussion Of The High-voltage Epmentioning

confidence: 99%

Section: Review Of Previous Studies On Mechanical Model and Breakage mentioning

confidence: 99%

Section: Rock Breaking Process Of High Voltage Epbmentioning

confidence: 99%

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

Duan

Tan

et al. 2019

Energies

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The effect of magnetic field on the electric breakdown trajectory of high‐voltage electric pulse rock breaking

Liu,

Zhou,

Zhu

2023

Contributions to Plasma Physics

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High‐voltage electric pulse drilling technology has the advantages of high rock‐breaking efficiency, low energy consumption for rock breaking, and good quality of well wall, which is a new and efficient potential rock‐breaking method. In this paper, we constructed a numerical simulation model of rock electric breakdown and realized the whole process of rock breaking and plasma channel generation by high‐voltage electric pulse. The results of the study showed that the change of magnetic field has a large influence on the formation of plasma channels inside the rock, and under the self‐magnetic field environment, the plasma channels inside the rock show branching, and the maximum penetration depth and maximum damage depth are higher than those under the non‐magnetic field environment. In the external magnetic field environment, the plasma channels gradually tend to develop “downward” (inside the rock), and the temperature distribution of the plasma channels inside the rock is more concentrated. In the presence of a magnetic field, the speed and degree of freedom of charged particles are limited. In an external magnetic field environment, the charged particles cause fewer particles to deviate, and the particles show a “downward” accumulation phenomenon. The research in this paper can provide certain theoretical and technical guidance for the development of electric pulse rock‐breaking technology and provide reference for the development and parameter optimization of electric pulse rock‐breaking tools.

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The mechanism of granite breaking by electric pulse under high temperature and high pressure environment

Liu,

Zhou,

Zhu

2024

Num Anal Meth Geomechanics

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High‐voltage electric pulse drilling technology has the advantages of high rock‐breaking efficiency, and low rock‐breaking energy consumption, which is one of the most promising rock‐breaking methods in geothermal drilling. However, there is insufficient understanding of the mechanism of high‐voltage electric pulse breaking of HDR under high‐temperature and high‐pressure environments (HTHP). In this paper, a numerical simulation model of electric breakdown under HTHP is constructed, and the whole process of high voltage electric pulse rock‐breaking and plasma channel generation is realized from the seven‐field coupling of circuit field, current field, magnetic field, breakdown field, heat transfer field, solid mechanics field and flow field. The temperature changes in the rock during the electric pulse rock‐breaking process were comprehensively analyzed, and the effects of different initial rock temperatures (200°C, 300°C, 400°C) and surrounding pressure conditions (30, 60, 90 MPa) on the high‐voltage electric pulse rock breaking law were considered. It is found that the thermal conductivity of the rock shows an increasing and then decreasing trend as the initial temperature of the rock increases, and that the thermal conductivity has a tendency to guide the development of plasma channels, and the radius of the plasma channels increases with the increase of the initial temperature of the rock. The heat transfer generated by high‐voltage electric pulse rock breaking is mainly in conduction, and the distribution shape of conduction heat is similar to the shape of the breakdown channel. The research in this paper can provide theoretical and technical guidance for developing electric pulse rock‐breaking technology.

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Electropulse technology of material destruction and boring

Cited by 28 publications

References 0 publications

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

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

The effect of magnetic field on the electric breakdown trajectory of high‐voltage electric pulse rock breaking

The mechanism of granite breaking by electric pulse under high temperature and high pressure environment

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