본 논문에서는 안정적인 전력공급이 어려운 실제 현장에 적용하기 위해서 PSC 내부 텐던의 긴장력 관리를 위한 저전압 EM센싱기법을 검증하였다. 지난 국내외 PSC 구조물 사고 사례를 볼 수 있듯이, 공용간 구조적 안정성을 확보하기 위해서는 PS텐던의 긴장력 관리가 매우 중요함을 알 수 있었다. 이에 본 논문에서는 EM센서를 통해 탄성-자기이론을 기반한 강자성 체의 자기변형과 응력의 관계를 이용하여 전압 크기에 따른 긴장력에 대한 자기이력곡선을 계측하고자 하였다. 이를 위해 이중 원통코일형태의 EM센서를 제작하고 유압식 인장기를 이용한 PS텐던 인장 실험 장비를 구성하였다. 실험은 단계적으 로 전압을 감소시켜 긴장력 크기에 따른 자기이력곡선의 변화를 계측하면서 최대/최소 전압값에 대한 계측결과에 따른 투자 율의 변화와 긴장력의 관계를 비교·분석하였다. 그 결과, 전압이 감소하여 자기장의 크기가 작아짐에 따라 추정식에 대한 상수는 상이하지만 유사한 형태의 자기이력곡선 투자율의 변화를 확인할 수 있었다. 이를 통해 본 연구에서는 저전압 상태에 서 EM센싱기법을 이용한 PSC 내부 텐던에 대한 긴장력 관리가 가능할 것으로 판단된다.

Linear and nonlinear models are available to simulate the effect of mine blasting and the results change by each model. Linear model can properly simulate loss of impact wave in plastic failure region based on comparison of site vibration measurement and numerical analysis iteratively. But, loss of impact wave in plastic failure region should be calibrated into input parameter of blasting pressure. A method to convert loss of impact wave into design parameter is suggested in this study.

Depending on the speed up of railway noise problem has become increasingly serious. In general, under the same conditions when the vehicle speed is 300km/h in a 400km/h increases, it is known that an increase in the noise level of 6 to 7dB. Railway Noise can be reduced by improving the vehicle and the track system. Also, the noise barrier and sound absorbing block may be a valid alternative to reduce railway noise. Here we propose a construction method of absorbing blocks are removable to allow maintenance.

To manage the data measured from Honam high-speed railroad(HSR) infrastructure(environmental noise reduction structures, track structures, catenary system), we are trying to establish an integrated database through analysis of the developed infrastructure technologies and standards, construction of prototypes on the fields and evaluation of infrastructure performance according to the increment of train speed. In this paper, integrated monitoring center for management of measured data is suggested.

Recently, Advanced automated infrastructure measurements have been made in the Honam high speed railway test-bed. In the future, Real time measurements will be the common based on these technologies. Here, we looked at the domestic and international trends and utilizing the inspection method of Railway Structures using self-powered sensors and wireless network technologies.

In this paper, the filed test procedure for evaluating the performance of track structure for additional Speed-Up test on Test-Bed Section(KP 100∼128km Osong starting point). The behavior of track system corresponding the speed up of train will be identified by the analysis of the measured data.

In this study, will evaluate the performance of noise reduction devices for next generation high speed railway system of a train which has maximum speed over 400km/h. The core soundproof devices are the absorption block which reduces the reflection noise from concrete slab track and the interference device installed the top of noise barrier. Two types devices will be verified at 400km/h test section according to studied performance assessment at Hwang-san Kim-jae Chonbuk, Jeonbuk, Korea.

Needs for a new technologies of infrastructure systems arose, following the development of next generation EMU(Electric Multiple Unit) train with maximum speed over 400km/h. For high-speed operation tests of the new EMU, a high-speed railway infrastructure test-bed was constructed in a 28km long section of the Honam High-speed Railway. Diverse sensors and monitoring system was installed for continuous monitoring of the railway. Due to such effort, further demands and needs of the integrated monitoring system was derived in a more comprehensive and long-term perspective.

Research results of High Speed Railroad Infrastructure Research Team are included in the fields of environmental noise reduction, the design criteria of high-speed railroad structures, catenary system, train control system. Therefore, we will apply these research results to test-bed in Honam high speed railroad and verify them.

In Korea, Because of excellent bending and torsional rigidity, PSC Box girder types have been applied to high-speed railway bridge in the most of the construction sites. But the introduction of a new structure types and materials is required in terms of diversity of landscape as landmarks. In this study, the latest high-speed rail bridge technology is investigated in terms of functionality and landscape.

Railroad concrete track is continuously supporting structure for repeated impact loads. Fine cracks which occurred in the early stage of the train operation, gradually expanded depending on the tonnage increases, and the function of the slab track is reduced. And, occurrence of track irregularity, worsening of ride comfort and interfere with the safe operation of trains would be follows. Therefore, management and maintenance of the initial crack is very important, railroad maintenance overhaul organizations detected twice a year or more the cracks and paint it, displays the location and severity, the type of cracks, width and length by creating a developed view. Each year much maintenance works is required for checking the crack of concrete trackbed and sleepers.

In this paper, sensors and equipments for monitoring the weather in test-bed of Honam high-speed railroad are introduced, and integrated monitoring system linked to weather information and its management plan are suggested.

In this study, it explains briefly the test procedure for evaluating the performance of roadbed in test-bed section of Honam high-speed railway.

In this study, it explains briefly the test procedure for evaluating the performance of track and bridge in test-bed section of Honam High-Speed Railway.

In this study, a full-scale test was conducted to analyze the behavior characteristics which are related to roadbed according to steel pipe press-in excavation during construction of underground railway crossing. the value of depth of soil cover that is the most sensitive element gets to increase gradually by 1.0, 1.5, and 2.0(H/D). Then we performed press-in excavation and measured the displacements of roadbed with LVDT. When the depth of soil cover level is 1.0(H/D), the maximum value of 5.2mm were seen at the point of 2mm for pipe press. Also, when depth of soil cover had increased, Uplift decreased more than 3 times in comparison with the one.

The schedule speed is one of the most important elements of railway industry. In korea, Gyeongbu Line’s highest speed is 300km/h. But it’s schedule-speed is no more than about 174km/h from Seoul to Busan. In this study, we analyzed the effect of the proposed improvements in the speed reduction zone using Train Performance Simulation. We found that the improvements can raise the schedule speed from 15 to 20%.

Test-bed site in Honam High Speed Railway is under construction for developing infra system core technology and speed-up test over 400km/h. High Speed Railway Infra System’s development are composed of comprehensive research developments which are comprising infra system such as railraod infrastructure, environmental noise reduction, catenary, train control and etc. For high speed-up, the review of track alignment, structural and running safety are required. In this paper, speed-up patterns of train by TPS and structural safety according to load variation are evaluated.

The construction of underground rail crossing is effect on railroad infra-structure and rail safety. So various methods have been suggested to construct through the infra-structure on the railroad. This paper treats the results of studies for safety of temporary bridge using a commercial FEM program, RM which is operated based on data measured on a sites. Also it was carried out optimal section considering characteristic of dynamic which reflects actual load for speed cases.

This study, for the development of next generation high speed railway system of a train which has maximum speed over 400km/h, is to develop core generic environmental technologies which are soundproof technology. Also this technology contains the emitting noise performance of high speed operated trains. The ultimate purpose of this study is to develop a new technology of core sound proof system which is more economical and efficient to cope with the noise increased about 7~9dB as the operating speed increased to 400km/h. In view of technology, this study is to the new soundproof shape design, noise absorbing material development, core soundproof facility development, noise reduction method which contains the aerodynamic characteristics of noise, the concrete bed track reflecting noise reduction, the specifications absorbing block of concrete bed and the installation and management of core soundproof system.

Recently, power distributed high-speed train with 430km/h(HEMU-430X) has developed in korea, 2012. However, the development of the train alone can not achieve the speed of high-speed rail system. So it needs the development of infrastructure system. In this paper, the project named “Application & technology development of high-speed rail infrastructure for 400km/h-class” being promoted in december 2010 will be introduced comprehensively.