Simulation of rock breaking test by high voltage electric pulse discharge based on Selfrag

doi:10.12143/j.ztgc.2021.08.006

Home > Archive>Volume 48, Issue 8, 2021 >40-46. DOI:10.12143/j.ztgc.2021.08.006

Simulation of rock breaking test by high voltage electric pulse discharge based on Selfrag
DOI:
                        10.12143/j.ztgc.2021.08.006
                    
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Author:
                        KONG Erwei1,2KONG Erwei
Research Center of Slim-hole Drilling Engineering Technology in Henan Province， Zhengzhou Henan 450001， China;The Fourth Geological Exploration Institute of Henan Geology & Mineral Bureau, Zhengzhou Henan 450001， China
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LI Ao3LI Ao
Faculty of Engineering, China University of Geosciences, Wuhan Hubei 430074, China
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ZENG Shiyou1,2ZENG Shiyou
Research Center of Slim-hole Drilling Engineering Technology in Henan Province， Zhengzhou Henan 450001， China;The Fourth Geological Exploration Institute of Henan Geology & Mineral Bureau, Zhengzhou Henan 450001， China
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DUAN Longchen3DUAN Longchen
Faculty of Engineering, China University of Geosciences, Wuhan Hubei 430074, China
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ZHANG Feng1,2ZHANG Feng
Research Center of Slim-hole Drilling Engineering Technology in Henan Province， Zhengzhou Henan 450001， China;The Fourth Geological Exploration Institute of Henan Geology & Mineral Bureau, Zhengzhou Henan 450001， China
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LI Changping4LI Changping
School of Mechanical Engineering and Electronic Information, China University of Geosciences,Wuhan Hubei 430074, China
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Affiliation:1.Research Center of Slim-hole Drilling Engineering Technology in Henan Province， Zhengzhou Henan 450001， China;2.The Fourth Geological Exploration Institute of Henan Geology & Mineral Bureau, Zhengzhou Henan 450001， China;3.Faculty of Engineering, China University of Geosciences, Wuhan Hubei 430074, China;4.School of Mechanical Engineering and Electronic Information, China University of Geosciences,Wuhan Hubei 430074, China
Clc Number:P634.1
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Abstract:

Under the action of high temperature plasma arc， high voltage electric pulse will produce thermal stress which can exceed the strength limit of rock， and break rocks， in particular hard rocks with obvious performance. This paper introduces the rock breaking mechanism of electric pulse. Based on the experimental data of Selfrag high-voltage electric pulse rock breaking， a simulation model of the needle electrode structure is established by using COMSOL Multiphysics simulation software. The influence of voltage， mineral composition and porosity on the distribution of electric field intensity in rock is studied. The results show that the distribution of electric field intensity is different with different applied voltage； the electric field distorts at the boundary of different mineral components， and the greater the change of relative permittivity of different mineral components， the more obvious the distortion is. Rock breaking with high voltage pulse occurs preferentially at the interface of different mineral components， and rock can be decomposed into various minerals depending on its composition. The presence of pores in the rock distorts the electric field around it； and the larger the porosity is， the easier electric breakdown the rock is.The research conclusion can provide reference for the selection of rock breaking parameters of drilling by high voltage electric pulse.

Key words:rock breaking by high voltage electric pulse;drilling by high voltage electric pulse;Selfrag test;COMSOL simulation;electric field distortion

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Received:March 11,2021
Revised:July 26,2021
Adopted:July 28,2021
Online: August 13,2021
Published: August 10,2021

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