Development of GPR Device and Analysis Method to Detect Thickness of Ballast Layer

Birhane, Fiseha Nega; Choi, Yeong Tae; Lee, Sung‐Jin

doi:10.7782/jksr.2020.23.3.269

Cited by 5 publications

(14 citation statements)

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“…The changes in the dielectric properties of different materials and, hence, the layers, alter the electromagnetic wave propagation. Such a feature, along with its ability to acquire high-speed data without disturbing train operations, makes GPR a desirable inspection tool [ 2 , 5 , 6 , 8 , 11 , 12 ]. Nevertheless, GPR is not yet used in a systematic manner for railway track characterization or rehabilitation planning [ 8 ], one of the reasons being the lack of a simple and reliable method.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, there are no potent procedures to find the level and type of fouling quantitatively. Recently, many studies have focused on identifying the thicknesses and fouling levels of railway ballast by means of a frequency-domain analysis, in addition to a time-domain analysis [ 2 , 8 , 11 , 13 , 14 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

“…Birhane et al [ 11 ] developed a 500 MHz GPR device (referred to as a KRRI GPR device). The device has eight channels and can eliminate sleeper noise at the GPR surveying stage.…”

Section: Introductionmentioning

confidence: 99%

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Development of Condition Assessment Index of Ballast Track Using Ground-Penetrating Radar (GPR)

Birhane

Choi

Lee

2021

Sensors

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The condition of the ballast is a critical factor affecting the riding quality and the performance of a track. Fouled ballast can accelerate track irregularities, which results in frequent ballast maintenance requirements. Severe fouling of the ballast can lead to track instability, an uncomfortable ride and, in the worst case, a derailment. In this regard, maintenance engineers perform routine track inspections to assess current and future ballast conditions. GPR has been used to assess the thickness and fouling levels of ballast. However, there are no potent procedures or specifications with which to determine the level of fouling. This research aims to develop a GPR analysis method capable of evaluating ballast fouling levels. Four ballast boxes were constructed with various levels of fouling. GPR testing was conducted using a GSSI (Geophysical Survey Systems, Inc.) device (400, 900, 1600 MHz), and a KRRI (Korea Railroad Research Institute) GPR device (500 MHz), which was developed for ballast tracks. The dielectric permittivity, scattering of the depth (thickness) values, signal strength at the ballast boundary, and area of the frequency spectrum were compared against the fouling level. The results show that as the fouling level increases, the former two variables increase while the latter two decrease. On the basis of these observations, a new integrated parameter, called a ballast condition scoring index (BCSI), is suggested. The BCSI was verified using field data. The results show that the BCSI has a strong correlation with the fouling level of the ballast and can be used as a fouling-level-indicating parameter.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of Condition Assessment Index of Ballast Track Using Ground-Penetrating Radar (GPR)

Birhane

Choi

Lee

2021

Sensors

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“…In railway engineering, the ballasted track system with concrete sleeper is the major type that is generally used in conventional lines. However, the biggest drawbacks of this system are insufficient ballast depth and ballast fouling that causes the degradation of the track as well as affecting the drainage capacity of the track [1][2][3]. Moreover, the maintenance cost of the ballasted track is also mentioned as a limitation when operating this system.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Structural Dynamic Response and Vehicle-Track Interaction of Precast Slab Track Systems

Jang

Kang

2021

Applied Sciences

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Recently, precast slab tracks have been used widely in railway applications, especially in conventional urban railway lines. These types of tracks are rapidly constructed and limit interruptions to train operation. However, the problems of dynamic stability when the trains run on the discontinuous type of tracks must be seriously considered. This paper focuses on analyzing the train-track interaction in two types of tracks under the dynamic load by using the numerical analysis program (APATSI) to evaluate the structural response as well as the running safety to precisely understand the load transfer efficiency of precast slab track systems.

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“…However, the ballasted track also has essential drawbacks such as high maintenance cost, fouled ballast, or insufficient support to the track structures. The track degradation's main causes are ballast fouling and insufficient depth of ballast [2]. Therefore, it is necessary to develop and research a non-destructive method such as ground penetrating radar (GPR) to limit these problems because the capacity of drainage in railway infrastructure is highly dependent on the fouled ballast [3].…”

Section: Introductionmentioning

confidence: 99%

Load Transfer Efficiency Based on Structural Deflection Assessment of the Precast Floating Track

Kang

2020

Applied Sciences

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In Korea, a precast floating track with anti-vibration isolators was recently developed to reduce the vibration and noise in urban railway stations, without disrupting train operations. This precast floating slab track is a newly developed structure and differs from existing conventional slab tracks. In this study, a Finite Element Method program (MIDAS CIVIL 2019) was used to analyze the load-carrying ability of structures under the train axle loads. After finishing the design, to understand more precisely about load transfer efficiency of this type of track, an assembly test (two load cases) was conducted with three precast panels (with rail 60 K mounted on) and compared with Finite Element Analysis results. The final results satisfied the test standards in Korea, which confirms that the precast floating track has an acceptable safety factor and structural behavior.

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Development of GPR Device and Analysis Method to Detect Thickness of Ballast Layer

Cited by 5 publications

References 0 publications

Development of Condition Assessment Index of Ballast Track Using Ground-Penetrating Radar (GPR)

Development of Condition Assessment Index of Ballast Track Using Ground-Penetrating Radar (GPR)

Assessment of Structural Dynamic Response and Vehicle-Track Interaction of Precast Slab Track Systems

Load Transfer Efficiency Based on Structural Deflection Assessment of the Precast Floating Track

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