Electrical discharge drilling of granite with positive and negative polarity of voltage pulses

Yudin, A. S.; Zhurkov, M. Yu.; Martemyanov, S. M.; Datskevich, S. Yu.; Vazhov, V. F.

doi:10.1016/j.ijrmms.2019.104058

Cited by 35 publications

(12 citation statements)

References 10 publications

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“…Additionally, this article analyses the final length of prominent cracks when subjected to an electropulse. The dominating cracks are subjected to the function of electric explosive products, which, in the form of explosive gases and high-temperature plasma, indirectly drive the growth of major fractures (Yudin et al, 2019) [ 9 ]. These electric explosive compounds are injected into boreholes and cracks, where they continue to develop the primary cracks via quasi-static action.…”

Section: Resultsmentioning

confidence: 99%

“…High-voltage discharge rock breaking is a highly effective technique that has been widely used in the fields of underground drilling, mineral processing, micro-ore decomposition, and incrustation cleaning (Burkin et al, 2009a; Yan et al, 2016; Wang et al, 2015; Duan et al, 2015; Touzé et al, 2016; Yudin et al, 2019) [ 4 , 5 , 6 , 7 , 8 , 9 ]. The advantage of high-voltage discharge drilling technology, which is close to industrialization at the moment (Yudin et al, 2019; Dzhantimirov et al, 2005; Park et al, 2013) [ 9 , 10 , 11 ], is its high breaking efficiency, controllability and low cost in deep welling (Biela et al, 2009) [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, under a high-voltage electropulse, the rock is not only subjected to dynamic loading such as shock wave, but also high-temperature plasma and explosive products in the form of quasi-static effects that continue to damage the rock in different time scales (Ma and An, 2008; Vogler et al, 2020; Zuo et al, 2020) [ 28 , 29 , 30 ]. Meanwhile, the heterogeneity of the rock causes a change in the distribution of stress, which may lead to fractal cracking or secondary cracking (Yudin et al, 2019; Kutter and Fairhurst, 1971) [ 9 , 31 ]. This adds complexity to the examination of the rock collapse process and the formation of damage.…”

Section: Introductionmentioning

confidence: 99%

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Mechanism Analysis of Rock Failure Process under High-Voltage Electropulse: Analytical Solution and Simulation

et al. 2022

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This work aims to investigate and analyse the mechanism of rock failure under high-voltage electropulses in order to evaluate and increase the efficiency of high-voltage pulse technology in geological well drilling, tunnel boring, and other geotechnical engineering applications. To this end, this paper discusses the equivalent circuit of electric pulse rock breaking, the model of shock wave in electro channel plasma, and, particularly, the model of rock failure in order to disclose the rock failure process when exposed to high-voltage electropulse. This article uses granite as an example to present an analytical approach for predicting the mechanical behaviour of high-voltage electropulses and to analyse the damage that occurs. A numerical model based on equivalent circuit, shock wave model, and elasto-brittle failure criterion is developed for granite under electropulse to further examine the granite failure process. Under the conditions described in this study, and using granite as an example, the granite is impacted by a discharge device (Marx generator) with an initial voltage U0 that is 10 kV and a capacitance F that is 5 µF before it begins to degrade at about 40 µs after discharge, with the current reaching its peak at approximately 50 µs. The shock wave pressure then attains a peak at about 70 µs. Dense short cracks form around granite and the dominant cracks grow to an average length of about 20 cm at around 200 µs. The crack width dcr is predicted to be approximately 1.6 mm. This study detects dense cracks in a few centimetres surrounding the borehole, while around seven dominant cracks expand outward. The distribution of the length of the dominating cracks can be inhomogeneous because of the spatial heterogeneity of granite’s tensile strength, however the heterogeneity has an insignificant effect on the crack growth rate, total cracked area, or the number of main cracks. The mechanism of rock failure under electropulse can be well supported by the findings of numerical simulations and analytical studies.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanism Analysis of Rock Failure Process under High-Voltage Electropulse: Analytical Solution and Simulation

et al. 2022

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“…In our paper, we refer to Timoshkin et al [ 36 ], Kusaiynov et al [ 37 ], Yudin et al [ 38 ], and Li et al to design the structure of electrode drill bits [ 39 , 40 ], which consist of one or more pairs of electrodes and are generally placed in parallel, and we use the rock-fracturing unit of EPB drill bits to develop a two-dimensional high-voltage electrical pulse penetration model. In this research, the same electrode pair method is utilized, as depicted in Figure 4 .…”

Section: Model Simulationsmentioning

confidence: 99%

The Utilization of a Coupled Electro-Thermal-Mechanical Model of High-Voltage Electric Pulse on Rock Fracture

et al. 2023

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Our research proposes a unique coupled electro-thermal-mechanical model that takes electric breakdown and heterogeneity into account to show the mechanism of rock fracturing under high-voltage electropulses. Using finite element numerical software, the process of high voltage electrical pulse injection into the rock interior for breakdown is described, and the formation law of plasma channels during the electrical breakdown process is comprehensively analyzed in conjunction with the conductor particles present within the rock. On the basis of electrical, thermal, and mechanical theories, a coupled multi-physical field numerical model of rock failure under the action of high-voltage electrical pulses is developed, and a random distribution model is utilized to simulate the potential occurrence of conductor particles in the rock. Innovative numerical model indicates plasma channel creation in the rock-crushing process. Prior to the formation of the plasma channel, the temperature and stress are approximately 103 k and 10−2 MPa, respectively. Once the plasma channel is formed, the temperature and stress increase abruptly in a short time, with the temperature reaching 104 k and the stress reaching 103 MPa or higher. In addition, it is revealed that the breakdown field strength is the essential factor in plasma channel creation. The heterogeneity of the particles within the rock and the fluctuation in electrode settings are also significant variables influencing the creation of channels. The presented model contributes to a better understanding of the mechanism of rock fragmentation during high-voltage electrical pulses, which has substantial implications for oil exploration and mineral extraction.

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“…These shortcomings and the quest for harnessing deep geothermal energy in cold areas, like Scandinavia, have stimulated an intensive search for non-mechanical drilling and comminution methods. These methods include plasma jet drilling [2], electro-pulse drilling [3][4][5], microwave-induced breakage [6], and thermal shock (flame jet)-induced drilling and cracking of rock [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Thermal jet drilling of granite rock: a numerical 3D finite-element study

Saksala

Kouhia

Mardoukhi

et al. 2021

Phil. Trans. R. Soc. A.

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This paper presents a numerical study on thermal jet drilling of granite rock that is based on a thermal spallation phenomenon. For this end, a numerical method based on finite elements and a damage–viscoplasticity model are developed for solving the underlying coupled thermo-mechanical problem. An explicit time-stepping scheme is applied in solving the global problem, which in the present case is amenable to extreme mass scaling. Rock heterogeneity is accounted for as random clusters of finite elements representing rock constituent minerals. The numerical approach is validated based on experiments on thermal shock weakening effect of granite in a dynamic Brazilian disc test. The validated model is applied in three-dimensional simulations of thermal jet drilling with a short duration (0.2 s) and high intensity (approx. 3 MW m −2 ) thermal flux. The present numerical approach predicts the spalling as highly (tensile) damaged rock. Finally, it was shown that thermal drilling exploiting heating-forced cooling cycles is a viable method when drilling in hot rock mass. This article is part of the theme issue ‘Fracture dynamics of solid materials: from particles to the globe’.

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Electrical discharge drilling of granite with positive and negative polarity of voltage pulses

Cited by 35 publications

References 10 publications

Mechanism Analysis of Rock Failure Process under High-Voltage Electropulse: Analytical Solution and Simulation

Mechanism Analysis of Rock Failure Process under High-Voltage Electropulse: Analytical Solution and Simulation

The Utilization of a Coupled Electro-Thermal-Mechanical Model of High-Voltage Electric Pulse on Rock Fracture

Thermal jet drilling of granite rock: a numerical 3D finite-element study

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