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- Jena, Jajati K., et al.
(author)
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Aggregated risk of a series of tunnels on Mumbai–Pune expressway
- 2020
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In: International Journal of Systems Assurance Engineering and Management. - : Springer. - 0975-6809 .- 0976-4348. ; 11:July, issue 2, s. 357-366
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Journal article (peer-reviewed)abstract
- In the heavily industrialized western India, on the express way between Mumbai and Pune there is a series of five 03-lane one way tunnels. Risks in the tunnels on the hilly express way are sourced from the heavy goods vehicles often carrying dangerous goods. During the design stage, risk assessment is carried out using theoretical risk models such as OECD/PIARC DG-QRAM. However, during operational stage of a tunnel real time accident data are available to estimate the risk or fatality rate. In this paper a methodology has been developed to estimate aggregated risk of the series of 05 tunnels from the accident rate by Monte-Carlo simulation using simple random sampling technique. It has been found that major accident rate (or risk) is better represented by lognormal distribution.
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- Jena, Jajati K., et al.
(author)
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Tunnel QRA : Present and Future Perspectives
- 2019
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In: System Performance and Management Analytics. - Singapore : Springer. - 9789811073229 - 9789811073236 ; , s. 387-403
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Book chapter (peer-reviewed)abstract
- With the vision of faster in-land transportation of humans and goods, long tunnels with increasing engineering complexities are being designed, constructed and operated. Such complexities arise due to terrain (network of small tunnels) and requirement of multiple entries and exits (network of traffics leading to non-homogenous behaviour). Increased complexities of such tunnels throw unique challenges for performing QRA for such tunnels, which gets compounded due to handful number of experiments performed in real tunnels, as they are costly and dangerous. A combined approach of CFD modelling of scaled down tunnels could be a relatively less resource intensive solution, nevertheless, associated with its increased uncertainties due to introduction of scaling multiplication factors. Further, with the advent of smart system designs and cheap computational cost, a smart tunnel which manages its own traffic of both dangerous goods carriers and other passenger vehicles based on continuously updated dynamic risk estimate, is not far from reality.
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Advances in RAMS Engineering : In Honor of Professor Ajit Kumar Verma on His 60th Birthday
- 2020
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Editorial collection (peer-reviewed)abstract
- This book surveys reliability, availability, maintainability and safety (RAMS) analyses of various engineering systems. It highlights their role throughout the lifecycle of engineering systems and explains how RAMS activities contribute to their efficient and economic design and operation.The book discusses a variety of examples and applications of RAMS analysis, including:• software products;• electrical and electronic engineering systems;• mechanical engineering systems;• nuclear power plants;• chemical and process plants and• railway systems.The wide-ranging nature of the applications discussed highlights the multidisciplinary nature of complex engineering systems. The book provides a quick reference to the latest advances and terminology in various engineering fields, assisting students and researchers in the areas of reliability, availability, maintainability, and safety engineering.
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- Venkatachalam, G., et al.
(author)
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Reliability Considerations in Analysis of Tunnels in Squeezing Rock
- 2020
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In: Advances in RAMS Engineering. - Cham : Springer Nature. ; , s. 237-257
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Book chapter (peer-reviewed)abstract
- Advances in RAMS Engineering pp 237–257Cite asReliability Considerations in Analysis of Tunnels in Squeezing RockDownload book PDFDownload book EPUBReliability Considerations in Analysis of Tunnels in Squeezing RockG. Venkatachalam, Mallika Sreedharan & A. Srividya ChapterFirst Online: 11 December 2019492 AccessesPart of the Springer Series in Reliability Engineering book series (RELIABILITY)AbstractUnderground openings and excavations are increasingly being used for civilian and strategic purposes all over the world.Access provided by Lulea University of Technology LibraryUnderground openings and excavations are increasingly being used for civilian and strategic purposes all over the world. Pressure on tunnel support depends on deformation and stress release and tunnels can be classified [9] into: (a) conforming; (b) non-conforming. Evaluation of safety of a tunnel, especially a non-conforming one, in soft ground or poor rock mass needs an interactive analysis. Interaction is an issue of great relevance in the case of tunnels in lower Himalayas. Many valuable field observations on actual Himalayan tunnels have been documented by [2, 7, 8]. Based on these, several empirical correlations have been developed, which are very useful in evaluating, particularly, the rock pressure on such tunnels. Although the correlations account for a wide variety of ground conditions, there is, inevitably, considerable empiricism. Jimenez and Recio [3] have attempted a probabilistic modelling of the variable ground conditions and evolved classifiers to distinguish between squeezing and non-squeezing conditions. However, evaluating the response of tunnels considering the material uncertainties has not been included in their scope. The present study is an attempt to evaluate tunnel safety and stability through reliability analysis under squeezing conditions.
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