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호남고속철도 계획노선에서의 피에조콘 관입시험(CPTu)에 의한 연약지반 특성 평가
이일화(Lee Il-Wha),권오정(Kwon Ohjung),권진수(Kwen Jin-Su),민경남(Min Kyoung-Nam) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
Piezocone penetration testing(CPTu) results such as cone resistance(q<SUB>c</SUB>), sleeve friction(f<SUB>s</SUB>), and pore pressure(u), have been carried out at 5 sites in Honam high-speed railway areas of Korea, in order to continuously estimate the characteristics of soil layers and the undrained shear strength(S<SUB>u</SUB>) in a soft ground. For the applications of the conventional CPTu results to undrained shear strength, the cone factors(N<SUB>kt</SUB>) were deduced based on Field vane tests, and Monte-Carlo Simulation(MCS). Moreover the correlations of the undrained shear strength of CPTu by soil depths were compared and revised with the results of triaxial compression(UU test), field vane and Dilatometer tests(DMT). The depths of soft foundation at 5 sites in Honam high-speed railway areas were calculated based on the results of the various field tests in addition CPTu. The applicability of CPTu for a soft foundation criterion referred to the criteria of high-speed railway and related agencies in Korea was evaluated.
신민호(Shin Min-Ho),김현기(Kim Hyun-Ki),이수형(Lee Su-Hyung),전한준(Jun Han-Jun),권진수(Kwen Jin-Soo) 한국철도학회 2009 한국철도학회 세미나자료 Vol.2009 No.11
To secure the safety of railway structure for various threatening factor, monitoring system and early warning system are established for dangerous structure. Development of sensor technology, advanced analysis method, construction of test bed and setting up total monitoring system for railway structure are main items for above purpose. Construction of total safety management system for railway structure by developing safety management technology is reported in this study. On-line real time monitoring system is setting up for railway bridge, tunnel, slope and subway. It is possible for this system to control sensors, data logger and communication system in the field. The data from system are automatically analyzed in server. And also it is possible to set up various safety standards. This system is very useful to standardize management of railway structure.
시간의존성을 고려한 해안가 철도 콘크리트 구조물에 대한 내구성 설계 기법의 개발
송하원(Ha-Won Song),백승우(Seung-Woo Pack),이선호(Son-Ho Lee),권진수(Jin-Su Kwen),이현정(Hyun-Jung Lee) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper presents a refined design model for current railroad design code on concrete structures exposed to marine environment. A time-varying diffusion coefficient(D) as well as surface chloride(C<SUB>s</SUB>) and chloride threshold level(C<SUB>lim</SUB>) are studied. Averaging value of the D with time over exposed duration were used to refined durability design model to consider time dependent characteristic of D. The values for C<SUB>s</SUB> and C<SUB>lim</SUB> for the seashore in Korea revised for realistic durability design. The proposed model was verified by the so-called performance-based durability design, which is widely used in recent durability design code. Results show that the current standard specification underestimates durability performances of concrete structures exposed to marine environment, so that the cover depth design using current durability evaluation in the standard specifications is very much conservative. Thus, it is found that proposed durability design models for the railroad design code for railway concrete structures can be used effectively for service life design of concrete structures in marine environment.