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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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International Journal of Railway
Journal Basic Information
Journal DOI :
Korean Society for Railway
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Volume & Issues
Volume 6, Issue 4 - Dec 2013
Volume 6, Issue 3 - Sep 2013
Volume 6, Issue 2 - Jun 2013
Volume 6, Issue 1 - Mar 2013
Selecting the target year
Improving Collision Energy Absorption In High Speed Train By Using Thin Walled Tubes
Salimi, Ehsan ; Molatefi, Habib ; Rezvani, MohammadAli ; Shahsavari, Erfan ;
International Journal of Railway, volume 6, issue 3, 2013, Pages 85~89
DOI : 10.7782/IJR.2013.6.3.085
The purpose of this paper is investigating the effect and influence rates of utilizing thin walled energy absorption tubes for improving crashworthiness parameter by increasing energy absorption of the body in high speed railcars. In order to find this, a proper profile of available tubes is chosen and added to the structure of selected high speed train in Iranian railway network (Pardis Trainset) and then examined in the scenario of impact with other moving rolling stock. Because of the specific features of LS-DYNA 3D software at collision analysis, the dynamic simulation has been performed in LS-DYNA 3D. The results of the analysis clearly indicate the improvement of train crashworthiness as the energy absorption of structure increases more than 30 percent in comparison with the original body. This strategy delays and reduces the shock to the structure. The verification of the simulation is by using ECE R66 standard.
An Environmentally Friendly Soil Improvement Technology with Microorganism
Kim, Daehyeon ; Park, Kyungho ;
International Journal of Railway, volume 6, issue 3, 2013, Pages 90~94
DOI : 10.7782/IJR.2013.6.3.090
Cement or lime is generally used to improve the strength of soil. However, bacteria were utilized to produce cementation of loose soils in this study. The microo rganism called Bacillus, and
was introduced into loose sand and soft silt and
in the voids of soil particles were produced, leading to cementation of soil particles. In this study, loose sand and soft silt typically encountered in Korea were bio-treated with 3 types of bacteria concentration. The cementation (or calcite precipitation) in the soil particles induced by the high concentration bacteria treatment was investigated at 7 days after curing. Based on the results of Scanning Electron Microscope (SEM) tests and EDX analyses, high concentration bacteria treatment for loose sand was observed to produce noticeable amount of
, implying a significant cementation of soil particles. It was observed that higher calcium carbonate depositions were observed in poorly graded distribution as compared to well graded distribution. In addition, effectiveness of biogrouting has also been found to be feasible by bio-treatment without any cementing agent.
A Review on the Effects of Earthborne Vibrations and the Mitigation Measures
Nam, Boo Hyun ; Kim, Jinyoung ; An, Jinwoo ; Kim, Bumjoo ;
International Journal of Railway, volume 6, issue 3, 2013, Pages 95~106
DOI : 10.7782/IJR.2013.6.3.095
Earthborne vibrations are induced by construction operation such as pile driving, roadbed compaction, and blasting and also by transit activities such as truck and trains. The earthborne vibration creates the stress waves traveling outward from the source and can structurally damage nearby buildings and structures in the forms of direct damage to structure and damage due to dynamic settlement. The wave propagation characteristics depends on impact or vibration energy, distance from the source, and soil characteristics. The aim of this paper is to provide a comprehensive review on the mechanistic of earthborne vibration and the current practice of vibration control and mitigation measures. The paper describes the state of knowledge in the areas of: (1) mechanics of earthborne vibration, (2) damage mechanism by earthborne vibration, (3) calculation, prediction of ground vibration, (4) the criteria of vibration limits, (5) vibration mitigation measures and their performance, and (6) the current practice of vibration control and mitigation measures.
Settlement Reduction Effect of Advanced Back-to-Back Reinforced Retaining Wall
Koh, Taehoon ; Hwang, Seonkeun ; Jung, Hunchul ; Jung, Hyuksang ;
International Journal of Railway, volume 6, issue 3, 2013, Pages 107~111
DOI : 10.7782/IJR.2013.6.3.107
In order to constrain the railway roadbed settlement which causes track irregularity, and thus threats running stability and ride quality, advanced Back-to-Back (BTB) reinforced retaining wall was numerically analyzed as railway roadbed structure. This study is intended to improve conventional Back-to-Back reinforced retaining wall as the technology which would reduce the roadbed settlement in a way of constraining the lateral displacement of its prestressed vertical facing and inducing arching effects in roadbed (backfill) placed between masonry diaphragm wall and vertical facing. As a result of numerical analysis, it was found that the roadbed settlement was reduced by 10% due to the prestressed vertical facing and embedded masonry diaphragm wall of the advanced Back-to-Back reinforced retaining wall system.
Evaluation of Dynamic Properties of Trackbed Foundation Soil Using Mid-size Resonant Column Test
Lim, Yujin ; Nguyen, Tien Hue ; Lee, Seong Hyeok ; Lee, Jin-Wook ;
International Journal of Railway, volume 6, issue 3, 2013, Pages 112~119
DOI : 10.7782/IJR.2013.6.3.112
A mid-size RC test apparatus (MRCA) equipped with a program is developed that can test samples up to D=10 cm diameter and H=20 cm height which are larger than usual samples used in practice. Using the developed RC test apparatus, two types of crushed trackbed foundation materials were tested in order to get the shear modulus reduction curves of the materials with changing of shear strain levels. For comparison purpose, large repetitive triaxial compression tests (LRT) with samples of height H=60cm and diameter D=30 cm were performed also. Resilient modulus obtained from the LRT was converted to shear modulus by considering elastic theory and strain level conversion and were compared to shear modulus values from the MRCA. It is found from this study that the MRCA can be used to test the trackbed foundation materials properly. It is found also that strain levels of
mostly used in the field should be verified considering the shear modulus reduction curves and proper values of
of trackbed foundation must be used considering the strain level verified.
Interior Noise Characteristics in Japanese, Korean and Chinese Subways
Soeta, Yoshiharu ; Shimokura, Ryota ; Jeon, Jin Yong ; Lee, Pyoung Jik ;
International Journal of Railway, volume 6, issue 3, 2013, Pages 120~124
DOI : 10.7782/IJR.2013.6.3.120
The aim of this study was to clarify the characteristics of interior noise in Japanese, Korean, and Chinese subways. The octave-band noise levels, A-weighted equivalent continuous sound pressure level (
) and parameters extracted from interaural cross-correlation/autocorrelation functions (ACF/IACFs) were analyzed to evaluate the noise inside running train cars quantitatively and qualitatively. The average
was 72-83 dBA. The IACF/ACF parameters of the noise showed variations in their values, suggesting they are affected by the characteristics of the trains running, wheel-rail interaction, and cross-section of the tunnels.
Investigation of Noise Spectrum Characteristics for an Evaluation of Railway Noise Barriers
Koh, Hyo-In ; Jang, Seungho ; Hong, Ji-Young ;
International Journal of Railway, volume 6, issue 3, 2013, Pages 125~130
DOI : 10.7782/IJR.2013.6.3.125
Most of the test methods used for determining the acoustic performance of the noise barriers in Korean standards address the sound-proof panels but refer to noise barriers as a whole system or their in-situ performances less. Many new types of trains with different operating speeds have been developed and produced, and civil appeals against railway noise are becoming quite extensive. Considering these latest changes of circumstances, it is necessary to investigate the current standards and specifications pertaining to railway noise barriers. In this paper, criteria for the measurements and evaluations of noise barriers and sound-proof panels are examined and experimental studies are introduced. In order to suggest more efficient methods for reasonable evaluations of the noise barriers, frequency spectrums of the noise source, the power of the actual railway vehicles, are investigated and introduced.