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혼용열차 구간 곡선부 자갈궤도 캔트 설정의 적정성 검토 연구
송봉환,염형진,박용걸 한국철도학회 2018 한국철도학회논문집 Vol.21 No.11
The purpose of this study is to investigate the optimal cant of curved ballast track according to various vehicleloads and speeds (KTX, AREX and AREX Express) in serviced lines. In this study, three-dimensional finite elementanalysis (FEA) was performed to assess the field cant adequacy for the running stability and performance of track consideringloads and speeds of various trains (AREX, KTX and AREX Express) Further, the interaction behavior of vehicleand track, track support stiffness (TSS) and running stability were evaluated experimentally for current track cant byfield tests. Through comparison of FEA and field test results, optimal cant was determined with consideration of runningstability and maintenance of track. From the results, we can evaluate the optimum cant level through assessmentfor terms of TSS deviation between low and high rail, running stability and track impact factor.
김용준(Kim Yong-Jun),김준영(Kim Jun-Young),김경택(Kim Kyung-Taek),염형진(Yeom Hyeong-Jin) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
This research reviews the characteristics of earth pressure incurred by GRS-RW mainly used in the railroad design in order to resist large lateral load caused by train and additional load induced by facilities such as noise barrier fences, electric poles, etc. The results of test shows the existence of arching effect that horizontal earth pressure increases in the backfill while earth pressure applying to the wall reduced under GRS-RW system. In both cases, unreinforced wall and GRS-RW system, the coefficient of earth pressure (K) is about 0.4 at the rest. However, after lateral displacement occurs, the earth pressure nearly reduce down to zero under GRS-RW system while the earth pressure decreases up to 0.12 in case of unreinforced retaining wall.
Graphic 방법을 이용한 암반의 경계조건에 따른 절리면 전단거동 예측
김용준(Kim Yong-Jun),이정학(Lee Jeong-Hark),송범(Song Pum),염형진(Yeom Hyeong-Jin) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
The characteristics of a rock joint which influence the stability of rock mass structures, such as the cut slopes and the tunnels, are largely controlled by the conditions of the rock joint as well as its boundary conditions. Boundary conditions can be represented by assuming that the deformability(or stiffness) of the rock mass surrounding the joints is modelled by a spring with stiffness. A new direct shear apparatus is developed in this study, which adapts a servo control system using PID algorithm. This apparatus can be used to investigate the various aspects of shear characteristics of the rock joints at conditions of constant normal stress and constant normal stiffness and so on. It is possible that the behavior under the constant normal stiffness condition can be predicted by the normalized graphic method with results obtained from the tests in the constant normal stress condition.