Analysis of cyclic deformation and post-cyclic strength of reinforced railway tracks on soft subgrade

Chawla, Sowmiya; Shahu, J. T.; Kumar, Sheo

doi:10.1016/j.trgeo.2021.100535

Cited by 15 publications

(5 citation statements)

References 16 publications

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“…To solve this research problem, Chawla, S. and others used a triangular element to wake up the contact stress analysis for the first time when analyzing the swept wing structure [11]. Zitrick and others derived the displacement method finite element model from the minimum potential energy principle, the force method from the minimum complementary energy principle, the hybrid method from the Hellinger-Reissner variational principle, the hybrid method finite element model from the modified complementary energy principle, etc.…”

Section: Literature Reviewmentioning

confidence: 99%

Comparative Analysis of Strength Calculation for Railway’s Flat Car Body Using Fuzzy Logic and Evolutionary Algorithms

Yang

2022

Mobile Information Systems

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This article makes an in-depth analysis of different body strength calculation methods using fuzzy logic and evolutionary algorithm by taking the universal flat car body strength calculation as an example. For this study, a more scientific and reliable theoretical basis for the structural strength design and analysis of railway flat car surveying and mapping is considered. If the expansion and contraction of the jack are not synchronised while jacking the vehicle body with a jack when the vehicle is freshly manufactured and maintained, the vehicle body will be in a three-point support state. The 3-point support state will result in permanent deformation if a structure with low torsional stiffness is used. If the structure characterized by small torsional stiffness is adopted, the 3-point support state will produce permanent deformation. The safety factor specified in EN12663 is only 1.15, which shows that the Interim Provisions have the highest requirements for the design of vehicle body strength and the corresponding design cost. From the fatigue strength analysis, it can be seen that the difference between the maximum principal stress and the corresponding allowable stress at the node level with the maximum von Mises stress is high, which is not the dangerous position of the structure. The research shows that there are great differences in the provisions of jacking load in various specifications.

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Section: Literature Reviewmentioning

confidence: 99%

Comparative Analysis of Strength Calculation for Railway’s Flat Car Body Using Fuzzy Logic and Evolutionary Algorithms

Yang

2022

Mobile Information Systems

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“…As a result, it is necessary to choose the most preferred research method for each specific task [16]. For instance, some research has been done on dynamic prediction models for tunnels [17,18], railway tracks [19], oil sludge straits [20], as well as various underground structures [21] and geotechnical applications in general [22]. But the usual problem of such methods is the ambiguity of the assessment of geophysical data.…”

Section: Literature Reviewmentioning

confidence: 99%

Mathematical Description and Laboratory Study of Electrophysical Methods of Localization of Geodeformational Changes during the Control of the Railway Roadbed

et al. 2021

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Currently, the load on railway tracks is increasing due to the increase in freight traffic. Accordingly, more and more serious requirements are being imposed on the reliability of the roadbed, which means that studies of methods for monitoring the integrity of the railway roadbed are relevant. The article provides a mathematical substantiation of the possibility of using seismoelectric and phasemetric methods of geoelectric control of the roadbed of railway tracks in order to identify defects and deformations at an early stage of their occurrence. The methods of laboratory modeling of the natural–technical system “railway track” are considered in order to assess the prospects of using the presented methods. The results of laboratory studies are presented, which have shown their high efficiency in registering a weak useful electrical signal caused by seismoacoustic effects against the background of high-level external industrial and natural interference. In the course of laboratory modeling, it was found that on the amplitude spectra of the output electrical signals of the investigated geological medium in the presence of an elastic harmonic action with a frequency of 70 Hz, the frequency of a harmonic electrical signal with a frequency of 40 Hz is observed. In laboratory modeling, phase images were obtained for the receiving line when simulating the process of sinking the soil base of the railway bed, confirming the presence of a transient process that causes a shift in the initial phase of the signal Δφ = 40° by ~45° (Δφ’ = 85°), which allows detection of the initial stage of failure formation.

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“…As of now, the behavior of RE walls and its component under static conditions are well known (Hatami and Bathurst, 2005;Abdelouhab et al, 2011;Chau et al, 2012;Koerner and Koerner, 2018). However, only a few studies have investigated the response of RE walls under high-speed train (HST) loading (Payeur et al, 2015;Chawla and Shahu, 2021). Due to lack of thorough understanding, only a few nations have successfully adopted the RE walls for HST infrastructure.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of reinforced earth walls with sustainable backfills subjected to railway loading

Mandloi

Hegde²

2022

Front. Built Environ.

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The concept of using Reinforced Earth (RE) walls for rail corridors is gaining popularity. As of now, very few nations have successfully adopted the RE walls for Railway infrastructure. These structures require good quality granular materials like sand for backfilling. However, due to the scarcity of good quality natural sand, research efforts are being made to look for cost effective alternatives to sand in backfill applications. The present study examines the possibilities of using the two sustainable materials, namely steel slag and construction and demolition waste (CDW), as backfills in RE walls subjected to harmonic train-induced load. In total, 63 separate full-scale numerical models of RE walls have been analyzed to understand the wall behavior with sustainable backfills subjected to different train speeds. The backfill materials were simulated with three different material models, namely, linear elastic, Mohr-Coulomb and Hardening Soil, for comparison. The results showed that the RE wall behavior is highly frequency-dependent. RE walls with steel slag and CDW backfills have shown 25% and 12% lesser deformations, respectively as compared to the sand backfill. Furthermore, reinforcement tensile forces in walls with sustainable backfills were found to be comparable to those of sand. The maximum deformation of the wall was observed when the fill materials were simulated with the Hardening Soil model. In overall, satisfactory performance of the RE wall was observed in the presence of sustainable backfill materials under Railway loading.

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Analysis of cyclic deformation and post-cyclic strength of reinforced railway tracks on soft subgrade

Cited by 15 publications

References 16 publications

Comparative Analysis of Strength Calculation for Railway’s Flat Car Body Using Fuzzy Logic and Evolutionary Algorithms

Comparative Analysis of Strength Calculation for Railway’s Flat Car Body Using Fuzzy Logic and Evolutionary Algorithms

Mathematical Description and Laboratory Study of Electrophysical Methods of Localization of Geodeformational Changes during the Control of the Railway Roadbed

Performance evaluation of reinforced earth walls with sustainable backfills subjected to railway loading

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