Ki Il Song
Assistant Professor of Geomechanics, Faculty of Engineering
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Expertise Summary
Dr. SONG KI IL completed his Ph.D. in the field of geotechnical engineering at the Korea Advanced Institute of Science and Technology (KAIST), South Korea. The title of his Ph.D. dissertation was "Evaluation and analysis methods for key elements affecting tunnel behavior - spatial variability, shotcrete bonding state, pre-reinforcement" which was selected by the Korean Tunnelling Association as the Best Ph.D. Thesis in 2010. His primary research has been mainly focused on geotechnical engineering specialized in tunnelling. Emphasis is placed on characterization of geo-materials and its behavior and stability analysis of tunnel and tunnel support by using wave-based nondestructive techniques and numerical methods to minimize the uncertainty and to secure the sustainable development of geo-infrastructures. In particular, he has experiences developing both mechanical/electromagnetic wave-based nondestructive experimental testing system to evaluate the various aspects of geo-materials (rock and soil) and geo-structures. Based on this research backgrounds, he will establishing nondestructive testing systems and perform its numerical studies that would develop geo-hazard mitigation technology and secure sustainable development of geo-infrastructures. Also, he has been studied THMC coupled analysis on hydrate-bearing sediments and CO2 sequestration.
Teaching Summary
- Civil Engineering Material
- Environmental Geotechnology
- Transport Infrastructure (Highway and Tunnel)
Research Summary
Currently, fundamental research on the propagation of the elastic wave and attenuation mechanism in particulate materials is being supported by the Ministry of Higher Education. Also, probabilistic… read more
Selected Publications
SONG, KI, CHO, GC and LEE, SW, 2011. Effects Of Spatially Variable Weathered Rock Properties On Tunnel Behavior Probabilistic Engineering Mechanics. 26(3), 413-426 SHIN, YJ, SONG, KI, LEE, IM and CHO, GC, 2011. Interaction Between Tunnel Supports And Ground Convergence-Consideration Of Seepage Forces International Journal Of Rock Mechanics And Mining Sciences. 48(3), 394-405
Current Research
Currently, fundamental research on the propagation of the elastic wave and attenuation mechanism in particulate materials is being supported by the Ministry of Higher Education. Also, probabilistic analysis on the propagation of the elastic wave in a multi-scale heterogeneous ground is currently under study. Through these experimental and numerical studies, a cost effective, environmentally friendly, and sustainable nondestructive testing system will be established. Research interest of Dr. SONG KI IL can be classified into three main streams: 1) Numerical and theoretical study on the underground space technology, 2) Nondestructive characterization techniques, 3) Gas-hydrate dissociation process.
Past Research
Primary research of Dr. SONG KI IL has been mainly focused on geotechnical engineering specialized in tunnelling. Emphasis is placed on characterization of geo-materials and its behavior and stability analysis of tunnel and tunnel support by using wave-based nondestructive techniques and numerical methods to minimize the uncertainty and to secure the sustainable development of geo-infrastructures. In particular, he has experiences developing both mechanical/electromagnetic wave-based nondestructive experimental testing system to evaluate the various aspects of geo-materials (rock and soil) and geo-structures (tunnel and slope).
Future Research
• Based on the strong background of numerical analysis, such as the finite element method, finite difference method, and discrete element method, geophysical and geomechanical studies have been carried out through the last few years. Using various commercial software, such as PLAXIS/ABAQUS/MIDAS-GTS(FEM), FLAC(FDM), and UDEC and PFC(DEM), Dr. SONG KI IL has been able to carry out numerous tunnel and slope projects. Stochastic, dynamic and Thermal-Hydraulic-Mechanical (THM) coupled analysis was undertaken for the stability analysis of geo-structures. Followings are the main research topics related to numerical and theoretical study on the underground space technology. Theoretical and numerical analyses of tunnel reinforcement, Tunnel support design of partial excavation using convergence confinement method, Geophysical modeling based on geo-centrifuge - Experimental and numerical studies, and Abrasive waterjet aided vibration reduced tunnel blasting technique-Numerical Analysis.
• An experimental set-up for electromagnetic wave and elastic wave propagation has been developed while advanced signal processing techniques have been programmed and incorporated. By using a developed system, various engineering properties of geo-materials can be directly and indirectly correlated with wave parameters in a micro-macro scale. The main goal of this study was to minimize the uncertainty of the geo-material. Also, a nondestructive testing system was developed that can be applied to the stability analysis of geo-structures. The Impact-Echo method coupled with Short-Time Fourier Transform method can be used for evaluating the shotcrete applied onto the rock and soil. This study will be extended by combining it with surface wave and various time-frequency domain analysis methods. The topics related to this area are Strain-dependent dynamic properties in interbeded rocks - Experimental and numerical study, Probabilistic analysis of elastic wave propagation in the multi-scale heterogeneous ground- Numerical study, Soil characterization using elastic and electromagnetic waves, and Smart geophysical characterization technique for geo-structures. • Dr. SONG KI IL has been studied THM coupled analysis on hydrate-bearing sediments and CO2 sequestration. Subsections of his potential research areas are Sequential and iterative THM analysis, Spatial variability of gas-hydrate deposit, Thermal conduction that considers the latent heat of hydrate dissociation, and Simulation of consolidation process.