摘要
A convenient approach was proposed by which to evaluate and monitor the permeability of a rock fracture by verifying the quantitative correlation between the electrical resistivity and permeability at laboratory scale.For this purpose,an electrical resistivity measurement system was applied to the laboratory experiments using artificial cells with the shape of a single rock fracture.Sixty experiments were conducted using rock fractures according to the geometry,aperture sizes,wavelengths,and roughness amplitudes.The overall negative relationship between the normalized electrical resistivity values and the aperture sizes directly linked with the permeability,was well fitted by the power-law function with a large determination coefficient(≈0.86).The effects of wavelength and roughness amplitude of the rock fracture on the electrical resistivity were also analyzed.Results showed that the electrical resistivity was slightly increased with decreasing wavelength and increasing roughness amplitude.An empirical model for evaluating the permeability of a rock fracture was proposed based on the experimental data.In the field,if the electrical resistivity of pore groundwater could be measured in advance,this empirical model could be applied effectively for simple,quick monitoring of the fracture permeability.Although uncertainty may be associated with the permeability estimation due to the limited control parameters considered in this research,this electrical resistivity approach could be helpful to monitor the rock permeability in deep underground facilities such as those used for radioactive waste repositories or forms of energy storage.
基金
supported by the National Research Foundation of Korea(KRF)grant funded by the Korea government(MSIT)(No.NRF-2019R1G1A1100517)
the Basic Research and Development Project of the Korea Institute of Geoscience and Mineral Resources(KIGAM),which was funded by the Ministry of Science and ICT,Korea。
作者简介
Corresponding author:Dr.Tae-Min Oh,is Assistant Professor at the Department of Civil and Environmental Engineering,Pusan National University,Republic of Korea.In 2012,he received his PhD degree in Geotechnical Engineering at Korea Advanced Institute of Science and Technology(KAIST),Republic of Korea.During 2012-2014,he worked as a postdoctoral fellow for developing new rock monitoring and excavation systems at Applied Engineering Research Center,KAIST.During 2014-2018,as a senior researcher at Center for Deep Subsurface Research,Climate Change Mitigation and Sustainability Division,Korea Institute of Geoscience and Mineral Resources(KIGAM),he studied advanced rock mechanics with acoustics emission(AE)and electrical resistivity technologies for deep depth rock.At present,he is a faculty member of Brain Korea 21 Plus Project of Pusan National University supported by Ministry of Education,Republic of Korea.Dr.Oh is also a editor of Journal of Korea Tunneling and Underground Space Association,and associate editor of KSCE Journal of Civil Engineering.His main research interests are related to the hard rock excavation,rock characteristics estimation using elastics waves(e.g.AE)and electrical resistivity,and underground structure health monitoring.In recent five years,he has conducted more than 10 research projects successfully.Based on the research activities,he holds more than 20(domestic and international)patents and has published about 50 papers in related academic journals.E-mail address:geotaemin@pusan.ac.kr。
