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횡배수관 클로깅 현상에 따른 공용중인 NATM 터널의 안전성 분석사례
기정서 ( Ki Jung Su ),박상희 ( Park Sang Hee ),나성옥 ( Na Sung Ok ),장기수 ( Jang Gi Soo ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.2
The latest precise inspection for safety and diagnosis has found the clogging of transverse drainage pipes in NATM tunnel, resulting in hydraulic pressure generated on the outside of lining concrete that poses a safety threat to the tunnel structure. Accordingly, this paper aims to conduct a safety analysis on using NATM tunnel that currently suffers the clogging of transverse drainage pipes based on its numerical analysis.
기정서 ( Ki Jung Su ),박현찬 ( Park Hyun Chan ),이경배 ( Lee Kyeong Bae ),장기수 ( Jang Gi Soo ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.1
For the last several years, climatic changes have led to the increase of natural disaster attributed to climatic abnormality, for instance, sweltering heat, heavy snow, or heavy rain. Particularly, localized guerrilla heavy rain mostly occurring in summer often results in flood damage. Such damage may lead to fatal damage to the safety of underground structures having the water level as the load. Accordingly, this study is going to introduce the cases of safety analysis grounded on numerical analysis in order to understand the structural behavior of riverbed tunnels according to water level fluctuations.
이수형(Lee Su-Hyung),정영훈(Jung Young-Hoon),이일화(Lee Il Hwa),장기수(Jang Ki Soo),신익수(Shin Ik Soo) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
The paper presents the procedures and results of the numerical modelling that was carried out to investigate the stability of reinforced earth wall under dynamic railway load. The two-dimensional explicit dynamic finite element method (ABAQUS) was used to carry out the numerical analyses. To simulate the railway load, the top surface of the backfill soil was excited by the uniform distributed load whose frequency and magnitude was estimated by the measured railway acceleration during train passing. The wall displacements and geogrid axial forces were analyzed to evaluate the stability of reinforced earth wall under the dynamic train load.
고속 가공기를 활용한 비구면 안경렌즈 유리금형용 세라믹코어 가공기술
류근만(Geun-Man Ryu),김효식(Hyo-Sik Kim),김홍택(Hong-Tek Kim),양순철(Sun-Choel Yang),장기수(Ki-Soo Jang),김동익(Dong-Ik Kim),원종호(Jong-Ho Won),김건희(Geon-Hee Kim) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.3
Ceramic core processing technology using 5-axis high-speed cutting machine is applied to make the glass molds for aspherical ophthalmic lenses. In the technology, optimum processing conditions for aspherical ceramic molds are based on minimal experimental data of surface roughness. Such surface roughness is influenced by fabricating tools, cutting speed, feed rate, and depth of cut, respectively. In this paper, we present that surface roughness and shape accuracy of aspheric ceramic mold obtained by optimum processing conditions are Pa 0.6184㎛ and Pt 5.0301㎛ , respectively, and propose that these values are sufficiently possible to apply to making the glass molds for aspherical ophthalmic lenses.