Analysis of the performance of under-sleeper pads in high-speed line transition zones

Insa, Ricardo; Zuriaga, Pablo Salvador; Inarejos, Javier; Medina, L.

doi:10.1680/tran.11.00033

Cited by 15 publications

(6 citation statements)

References 12 publications

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“…USPs may be used primarily to reduce damage to the ballast by increasing the contact area and reducing contact stresses (Johansson et al, 2006;Witt, 2008;Lakusic et al, 2010;Abadi et al, 2015), or to smooth or reduce the variations in track stiffness typical of transition zones (Insa et al, 2013). USPs have also been shown to modify elastic deflection and permanent settlements (Auer et al, 2013), and are generally considered to improve the track quality (reducing rates of track geometry deterioration, ballast and sleeper wear, and rail corrugation; UIC, 2008UIC, , 2009).…”

Section: Introductionmentioning

confidence: 99%

Effect of Sleeper Interventions on Railway Track Performance

Abadi

Pen

Zervos

et al. 2019

J. Geotech. Geoenviron. Eng.

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The sleeper / ballast interface is an essential stage in the transfer of train loads from a railway track structure into the ground. Generally, only a small number of ballast grains support the sleeper base. The resulting localised contact stresses can be very high, especially for modern concrete sleepers on hard igneous ballast. This may result in damage to both sleepers and ballast, and reduce the stability of the interface. The paper presents results from cyclic loading tests carried out to explore the potential for performance improvement through the adoption of different sleeper types and modifications to the sleeper / ballast interface. Measurements of resilient performance, plastic settlement, sleeper / ballast contact number and area, shoulder movement, ballast breakage and attrition and the development of ballast longitudinal pressure are used to explore and explain the effect of each intervention. It is shown that twin-block sleeper types and under sleeper pads (USP) have the potential to reduce maintenance requirements and whole life costs.

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Section: Introductionmentioning

confidence: 99%

Effect of Sleeper Interventions on Railway Track Performance

Abadi

Pen

Zervos

et al. 2019

J. Geotech. Geoenviron. Eng.

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“…Osim toga smanjuje se vijek trajanja objekata i tračničkoga vozila. Da bi spriječili neželjene posljedice na mostovima, za ublažavanje naglih promjena krutosti podloge koriste se betonski pragovi s podlošcima [6]. Ispitivanja su pokazala to da je ugradnjom podložaka na prijelaznoj dionici dovoljne duljine moguće postići mirniji prolazak vlaka preko podloga različitih krutosti, čime se smanjuje mogućnost oštećenja kolosiječne konstrukcije i samoga vozila (slika 7.).…”

Section: Primjena Betonskih Pragova S Elastičnim Podlošcima U Zoni Mounclassified

Possibility of application of concrete sleepers with under sleeper pads on bridges

Perčin¹,

Lakušić²

2019

5th Symposium on Doctoral Studies in Civil Engineering

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Jedan od najosjetljivijih segmenata željezničke infrastrukture svakako su mostovi. Svi čelični rešetkasti mostovi imaju drvene pragove koji su pričvršćeni za konstrukciju mosta te prilikom održavanja gornjega pružnog ustroja ne mogu mijenjati visinu. Prilikom obnove, rekonstrukcije ili zamjene dotrajalih mostova danas je praksa da se kolosiječna rešetka odvaja od konstrukcije mosta. Jedan od načina jest taj da se čelične rešetkaste konstrukcije zamjenjuju armiranobetonskim konstrukcijama u obliku korita ili, ako su rasponi veći, čeličnim konstrukcijama u obliku korita. Standardnu klasičnu kolosiječnu konstrukciju danas čine kolosijeci s betonskim pragovima i zastornom prizmom od tucaničkoga materijala. Takvi kolosijeci imaju smanjenu elastičnost, što je posebno važno na kontaktu praga i zastornoga materijala. Kako bi se smanjili negativni utjecaji vibracija i na taj način produljila trajnost kolosijeka, željezničke uprave sve češće primjenjuju AB pragove s elastičnim podlošcima. Ispitivanja su pokazala to da je ugradnjom podložaka moguće postići mirniji prolazak vlaka preko podloga različitih krutosti, čime se smanjuje mogućnost oštećenja kolosiječne konstrukcije i samoga vozila.

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“…During operation, rail vehicles generate noise, vibration, and impact loads 78 due to roughness and imperfections at the wheel-rail interface. Impact loads are commonly 79 generated by: (i) differential stiffness at track transition zones such as bridge approaches, rail 80 crossings, and turnouts; and (ii) rail abnormalities such as wheel flats and dipped rails which 81 seriously hamper the safety and efficiency of tracks (Varandas et al 2011, Insa et al 2014. It is 82 also noted that track transitions such as bridge approaches, road crossings and slab tracks in 83 connection with ballasted tracks are common locations of accelerated track degradation due to 84 abrupt changes in support stiffness, and associated differential settlements.…”

Section: Introduction 70mentioning

confidence: 99%

Improved performance of ballasted tracks under impact loading by recycled rubber mats

Ngo

Indraratna

Rujikiatkamjorn

2019

Transportation Geotechnics

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Ballasted tracks at transition locations such as approaches to bridges and road crossings experience increasing degradation and deformation due to dynamic and high impact forces, a key factor that decreases the stability and longevity of railroads. One solution to minimise ballast degradation at the transition zones is using rubber energy absorbing drainage sheets (READS) manufactured from recycled tyres. When placed beneath the ballast layer, READS distributes the load over wider area and attenuate of the load over a longer duration thus decreasing maximum stress, apart from reducing the energy transferred to the ballast and other substructure components. Subsequently, the track substructure experiences less plastic deformation and degradation. These mats also provide an environmentally friendly and cost-effective alternative. In this study, a series of large-scale drop hammer impact tests was carried out to investigate how effectively the READS could attenuate impact loads and help mitigate ballast deformation and degradation. Soft and stiff subgrade were used to investigate the loaddeformation response of ballast (with and without READS), subjected to impact loads from a hammer dropped from various heights (hd =100 -250 mm). Laboratory test results show that the inclusion of READS helps to reduce the dynamic impact load transferred to the ballast layer resulting in significantly less permanent deformation and degradation of ballast, apart from significant attenuation of load magnitude and vibration to the underlying subgrade layers.

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Analysis of the performance of under-sleeper pads in high-speed line transition zones

Cited by 15 publications

References 12 publications

Effect of Sleeper Interventions on Railway Track Performance

Effect of Sleeper Interventions on Railway Track Performance

Possibility of application of concrete sleepers with under sleeper pads on bridges

Improved performance of ballasted tracks under impact loading by recycled rubber mats

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