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

Changping Li, Longchen Duan, Songcheng Tan, Victor Chikhotkin and Wenpeng Fu
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Changping Li: School of Automation, China University of Geosciences, Wuhan 430074, China
Longchen Duan: Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
Songcheng Tan: Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
Victor Chikhotkin: Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
Wenpeng Fu: School of Automation, China University of Geosciences, Wuhan 430074, China

Energies, 2019, vol. 12, issue 4, 1-19

Abstract: 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.

Keywords: electro pulse boring; shock wave model; damage model; Crack; breaking mechanism (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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