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Mechanics Of Ballasted Rail Tracks

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Mechanics Of Ballasted Rail Tracks

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Author : Buddhima Indraratna
language : en
Publisher: CRC Press
Release Date : 2005-08-11

Mechanics Of Ballasted Rail Tracks written by Buddhima Indraratna and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-08-11 with Technology & Engineering categories.

In this book, the authors discuss testing of ballast, including the strength, deformation and degradation aspects of fresh and recycled ballast under monotonic and cyclic loading. The effectiveness of geosynthetics in stabilising recycled ballast has also been examined. A new stress-strain constitutive model for ballast incorporating particle breakage is presented. Finally, a new range of particle gradations, balancing the strength and permeability requirements, has been proposed for future rail tracks. This book is intended as a reference text for final year civil engineering students and postgraduates, and for practicing railway engineers with the task of modernizing existing designs.

Advanced Rail Geotechnology Ballasted Track

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Author : Buddhima Indraratna
language : en
Publisher: CRC Press
Release Date : 2023-08-14

Advanced Rail Geotechnology Ballasted Track written by Buddhima Indraratna and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-08-14 with Science categories.

Ballast plays a vital role in transmitting and distributing the train wheel loads to the underlying track substructure. The load-bearing capacity, safe train speed, and the levels of noise and vibration, as well as passenger comfort depend on the behaviour of ballast through particle interlocking and the corresponding deformation of this granular assembly. Attrition and breakage of ballast occur progressively under heavy and continual cyclic loading, causing track deterioration and rail misalignment affecting safety, while exacerbating the intensity of track maintenance. In the absence of realistic computational models, the track substructure is traditionally designed using mostly empirical approaches. In this book, the authors present the detailed information on the strength, deformation, and degradation aspects of fresh and recycled ballast under monotonic, cyclic, and impact loading using innovative geotechnical testing devices. A constitutive model for ballast incorporating particle breakage is presented representing a more realistic stress–strain response. The mathematical formulations and numerical models are validated using controlled experimental simulations and fully instrumented field trials. Revised ballast gradation is described to provide greater track resiliency and extended longevity. The book also provides a detailed description of geosynthetics for substructure improvement considering track deterioration caused by particle degradation, fouling, and impeded drainage. New to this second edition are extensive discussions on subgrade soil stabilisation, causes and mechanisms of soil fluidisation (mud pumping) under cyclic loading, and preventive and remedial measures to alleviate undue instability of ballast tracks. This book should prove most beneficial for final-year civil engineering students and for postgraduate teaching and learning. It is an ideal supplement for practising railway engineers and researchers engaged in the challenging tasks of future track design for heavier and faster trains.

Ballast Railroad Design Smart Uow Approach

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Author : Buddhima Indraratna
language : en
Publisher: CRC Press
Release Date : 2018-06-27

Ballast Railroad Design Smart Uow Approach written by Buddhima Indraratna and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-06-27 with Science categories.

The rail network plays an essential role in transport infrastructure worldwide. A ballasted track is commonly used for several reasons, including economic considerations, load bearing capacity, rapid drainage and ease of maintenance. Given the ever-increasing demand for trains to carry heavier axle loads at greater speeds, traditional design and construction must undergo inevitable changes for sustainable performance. Ballast is an unbounded granular assembly that displaces when subjected to repeated train loading affecting track stability. During heavy haul operations, ballast progressively deteriorates and the infiltration of fluidized fines (mud pumping) from the underlying substructure and subgrade decreases its shear strength and also impedes drainage, while increasing track deformation and associated maintenance. Features: serves as a useful guide to assist the practitioner in new track design as well as remediating existing tracks. research discussed in this book has made considerable impact on the railway industry. resulting from collaborative research between academia and industry, incorporating sophisticated laboratory tests, computational modelling and field studies. This book presents a comprehensive procedure for the design of ballasted tracks based on a rational approach that combines extensive laboratory testing, computational modelling and field measurements conducted over the past two decades. Ballast Railroad Design: SMART-UOW Approach will not only become an imperative design aid for rail practitioners, but will also be a valuable resource for postgraduate students and researchers alike in railway engineering.

The Mechanical Behaviour Of Ballasted Railway Tracks

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Author : Akke Simon Johanna Suiker
language : en
Publisher: Delft University Press
Release Date : 2002-01-01

The Mechanical Behaviour Of Ballasted Railway Tracks written by Akke Simon Johanna Suiker and has been published by Delft University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-01-01 with Technology & Engineering categories.

Advanced Rail Geotechnology Ballasted Track

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Author : Buddhima Indraratna
language : en
Publisher: CRC Press
Release Date : 2011-03-16

Ballast plays a vital role in transmitting and distributing train wheel loads to the underlying sub-ballast and subgrade. Bearing capacity of track, train speed, riding quality and passenger comfort all depend on the stability of ballast through mechanical interlocking of particles. Ballast attrition and breakage occur progressively under heavy cyc

Railroad Track Mechanics And Technology

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Author : Arnold D. Kerr
language : en
Publisher: Elsevier
Release Date : 2014-06-28

Railroad Track Mechanics And Technology written by Arnold D. Kerr and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-06-28 with Technology & Engineering categories.

Railroad Track Mechanics and Technology is a collection of paper that discusses the advancement in the various areas of railroad track technology. The title’s emphasis is on tackling the concerns that revolve around the track-train interaction. The first part of the text presents the articles about general topics, which include the FRA track research program and balanced national transportation budget. Next, the selection presents the technical materials, such as railroad track structure for high-speed lines; cause and effects of wheel load variation on the high-speed operating line; and the effect of lateral loads on track movement. The book will be of great use to the engineers and technicians who work in rail way transportation industry.

System Dynamics And Long Term Behaviour Of Railway Vehicles Track And Subgrade

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Author : Karl Popp
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-06-06

System Dynamics And Long Term Behaviour Of Railway Vehicles Track And Subgrade written by Karl Popp and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-06-06 with Technology & Engineering categories.

During the last decades completely new technologies for high speed railway vehicles have been developed. The primary goals have been to increase traction, axle load, and travelling speed, and to guarantee the safety of the passengers. However, new developments have revealed new limitations: settlement and destruction of the ballast and the subgrade lead to deterioration of the track; irregular wear of the wheels causes an increase in overall load and deterioration in passenger comfort; and damage of the running surfaces of the rail and the wheel is becoming more frequent. These problems have been investigated in the Priority Programme SPP 1015 supported by the Deutsche Forschungsgemeinschaft (DFG), with the goal of better understanding of the dynamic interaction of vehicle and track, and the long-term behavior of the components of the system. The book contains the scientific results of the programme as presented at the concluding colloquium held at University of Stuttgart, Germany, 2002.

Advanced Rail Geotechnology Ballasted Track

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Author : Buddhima Indraratna
language : en
Publisher: CRC Press
Release Date : 2023-08-14

Railway Geotechnics

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Author : Dingqing Li
language : en
Publisher: CRC Press
Release Date : 2015-09-17

Railway Geotechnics written by Dingqing Li and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-09-17 with Technology & Engineering categories.

Links Geotechnics with Railway Track Engineering and Railway Operation Good railway track and railway operations depend on good geotechnics, in several different ways and at varying levels. Railway Geotechnics covers track, track substructure, load environment, materials, mechanics, design, construction, measurements, and management. Illustrated by

Investigation Of Form Effect On Ballast Mechanical Behavior Based On Discrete Element Modeling

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Author : Bo Wang
language : en
Publisher: BoD – Books on Demand
Release Date : 2019-08-27

Investigation Of Form Effect On Ballast Mechanical Behavior Based On Discrete Element Modeling written by Bo Wang and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-08-27 with Technology & Engineering categories.

As an essential component of the ballast track, the ballast layer provides functionali-ties such as drainage, load distribution, as well as strength and stability for the rail-way track. The mechanical behaviors of ballast track such as its permanent settle-ment, breakage, force propagation and void ratio are in a great extent influenced by the form distribution of ballast stones. Its reasonable design will greatly improve the mechanical behaviors, and thus prolong the maintenance cycle of ballast track, or reduce the number of ballast stones needed for construction. This dissertation focuses on proposing optimized ballast stones in the ballast aggre-gate in regard to their geometrical forms. As the first step, a ballast random form gen-erator, which is designed to generate ballast form databases with different form dis-tributions, is proposed. 15 databases are created for further usage. Afterwards, Dis-crete Element Method (DEM) based simulations are performed to investigate the mechanical behaviors of ballast aggregates. The simulation model is established based on a box test, whose result is presented firstly. Establishment and calibration process of the model are expatiated afterwards. A parameter study regarding to cru-cial modeling parameters is also performed. Using the validated parameters and the 15 generated form databases, DEM simulation models with different form distribu-tions of ballast stones in the ballast aggregate are proposed. Simulative methods to quantify the mechanical behaviors are elaborated. Based on the obtained results, the interrelation between mechanical behaviors of ballast aggregate and the form effect on mechanical behavior of the ballast aggregates are studied. The optimized ballast aggregate is proposed based on the findings stated above. The proposed optimized ballast aggregate is expected to be a reference for construc-tion of ballast track in real world. The modeling technic and the calibrated modeling parameters can be used for optimization for different railway operating programs.

Mechanics Of Ballasted Rail Tracks

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