The lateral displacement response of geogrid-reinforced ballast under cyclic loading

Indraratna, Buddhima; Hussaini, Syed Khaja Karimullah; Vinod, Jayan S.

doi:10.1016/j.geotexmem.2013.07.007

Cited by 118 publications

(78 citation statements)

References 26 publications

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“…The tests were conducted using a large-scale modified process simulation test (MPST) apparatus, which is 800 mm long by 600 mm wide and can accommodate specimens 650 mm high. The central portion of one of the side walls parallel to the sleeper consists of five independent movable plates (600 by 64 mm) assembled vertically with 1 mm gap between each plate (Indraratna et al 2013). Figure 1(a) shows the schematic diagram of the side wall of test apparatus with five-movable plates.…”

Section: Basic Structure Of An Optical Fiber and Operating Principlementioning

confidence: 99%

Application of Optical-Fiber Bragg Grating Sensors in Monitoring the Rail Track Deformations

2015

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The lateral flow of ballast during the passage of trains can reduce the stability of rail tracks. Therefore, it is important to monitor and restrain the movement of ballast accordingly in order to prevent track misalignment. This current study explored the use of optical-Fiber Bragg Grating (FBG) sensors to measure the lateral displacement of unreinforced and geogrid-reinforced ballast. The tests were conducted on fresh latite basalt at a loading frequency of 20 Hz and up to 250 000 load cycles. The test results showed that the FBG sensing system is fully capable of measuring the lateral displacement of ballast under high-frequency cyclic loading. A comparison of strains obtained from FBGs installed at different depths along the ballast depth is made and the lateral strain profiles are measured. Moreover, an empirical model to convert the FBG strains to an equivalent lateral displacement of ballast is proposed to effectively use this technology in realtime monitoring of track deformations. Moreover, an empirical model to convert the FBG strains to an equivalent lateral displacement of ballast is proposed to effectively use this technology in real-time monitoring of track deformations.

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Section: Basic Structure Of An Optical Fiber and Operating Principlementioning

confidence: 99%

Application of Optical-Fiber Bragg Grating Sensors in Monitoring the Rail Track Deformations

2015

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“…The coefficient of uniformity (c uf ) of different ballast samples after the testing ranged from 1.89-1.94 in comparison to an initial c u of 1.87 (Table 4). Their corresponding ballast breakage indices (BBI, after Indraratna et al 2005) ranged from 4.6 to 11.0%, as reported by Indraratna et al (2013). The generation of fines of different sizes as a result of particle breakage makes the sample well-graded, with the ones undergoing higher particle breakage exhibiting a higher value of c uf .…”

Section: Influence Of Loading On the Psd Of Ballastmentioning

confidence: 69%

“…The ballast specimen was recovered from the test apparatus and sieved at the end of each test to evaluate the change in gradation and to quantify the breakage of particles; thereafter the used ballast was discarded. Further details on test equipment and the testing procedures can be found in Indraratna et al (2013) and Hussaini et al (2015a).…”

Section: Materials Used and The Testing Methodsology Adoptedmentioning

confidence: 99%

“…The laboratory tests were conducted using a large-scale process simulation apparatus (LPSA) (Indraratna et al 2013). It can simulate a section of track with plan dimensions of 800 mm long by 600 mm wide.…”

Section: Large-scale Process Simulation Apparatus (Lpsa)mentioning

confidence: 99%

“…600 mm) represents the centre-to-centre spacing between the sleepers while its longer dimension (i.e. 800 mm) represents the width of the loaded track (Indraratna et al 2013). Test chambers of similar or smaller dimensions (having different side wall arrangements) were also successfully used in the past by several researchers (Mc.…”

Section: Large-scale Process Simulation Apparatus (Lpsa)mentioning

confidence: 99%

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A laboratory investigation to assess the functioning of railway ballast with and without geogrids

Hussaini

Indraratna

Vinod

2016

Transportation Geotechnics

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Understanding the complex load transfer mechanism and the subsequent accumulation of deformation in ballast and subballast layers under repeated wheel loading is essential to design resilient rail tracks. Large-scale cyclic tests have been conducted on railroad ballast instrumented with optical based fibre Bragg grating (FBG) sensors, LVDTs, pressure plates and the settlement pegs to explore the role of geogrid and its interaction with ballast in improving the track performance. Latite basalt and geogrids with different aperture sizes were used for the investigations. The laboratory experimental results indicate that the geogrid inclusions enhance track performance by arresting the lateral spreading of ballast and thereby significantly reducing the extent of its vertical settlement. In contrast, the reinforcement of ballast with geogrid has only a marginal effect on reducing the settlement in the subballast layer. The results also show that geogrid minimises the amount of particle breakage, the effectiveness of which is governed by its placement position, with lowest breakage occurring when the geogrid is placed at a location 130 mm above the subballast. In addition, geogrids also reduce the extent of vertical stress in the subgrade soil. The laboratory test results establish beyond doubt the effectiveness of FBG sensing system in capturing the ballast movement under cyclic loading. Disciplines Engineering | Science and Technology Studies

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The Effect of Elastic Pads and Mats on the Stress–Strain State of Railway Subgrade

Petriaev

Konon

Egorov

2021

Lecture Notes in Civil Engineering

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The lateral displacement response of geogrid-reinforced ballast under cyclic loading

Cited by 118 publications

References 26 publications

Application of Optical-Fiber Bragg Grating Sensors in Monitoring the Rail Track Deformations

Application of Optical-Fiber Bragg Grating Sensors in Monitoring the Rail Track Deformations

A laboratory investigation to assess the functioning of railway ballast with and without geogrids

The Effect of Elastic Pads and Mats on the Stress–Strain State of Railway Subgrade

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