The Experts below are selected from a list of 21 Experts worldwide ranked by ideXlab platform
Lysandros Pantelidis - One of the best experts on this subject based on the ideXlab platform.
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A critical review of highway slope instability risk assessment systems
Bulletin of Engineering Geology and the Environment, 2011Co-Authors: Lysandros PantelidisAbstract:Cet article considère différents systèmes d’évaluation des risques d’instabilité de talus d’autoroute. Il démontre que les systèmes quantitatifs, de même que les systèmes qualitatifs, présentent des inconvénients majeurs avec la caractéristique commune d’une prise en compte insuffisante de la géologie et de la géomorphologie. De plus, le rôle des conditions climatiques (le facteur de déclenchement de glissements le plus commun) est sous-estimé ou même ignoré. Il est noté que les différents systèmes d’évaluation des risques soit se focalisent sur une seule catégorie de conséquences (e.g. la sécurité des voyageurs) ou simplement additionnent les scores de plus d’une catégorie, ce qui peut conduire à une sous-estimation du risque pour une catégorie particulière. Finalement, l’intérêt et la fiabilité de la plupart des facteurs les plus communément utilisés portant à conséquence sont discutés. This paper reviews existing highway slope instability risk assessment systems. It demonstrates that both quantitative and qualitative systems have some major disadvantages with a common characteristic being the lack of emphasis on the geology and geomorphology of slopes. Furthermore, the role of climatic conditions (the most common landslide triggering factor) is diminished or even ignored. It is noted that the existing risk assessment systems focus either on only one Category of Consequences (e.g. travellers’ safety) or simply sum the scores of more than one Category, which may lead to an under-estimation of the significance of a Consequence Category. Finally, the suitability and reliability of the most commonly used Consequences factors are discussed.
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A critical review of highway slope instability risk assessment systems
Bulletin of Engineering Geology and the Environment, 2010Co-Authors: Lysandros PantelidisAbstract:This paper reviews existing highway slope instability risk assessment systems. It demonstrates that both quantitative and qualitative systems have some major disadvantages with a common characteristic being the lack of emphasis on the geology and geomorphology of slopes. Furthermore, the role of climatic conditions (the most common landslide triggering factor) is diminished or even ignored. It is noted that the existing risk assessment systems focus either on only one Category of Consequences (e.g. travellers’ safety) or simply sum the scores of more than one Category, which may lead to an under-estimation of the significance of a Consequence Category. Finally, the suitability and reliability of the most commonly used Consequences factors are discussed.
André Kemp - One of the best experts on this subject based on the ideXlab platform.
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A case for Consequence categories to guide the closure design of landforms
Proceedings of the 13th International Conference on Mine Closure, 2019Co-Authors: Peter Chapman, André KempAbstract:The legacy of many mine sites is that landforms will, in general, remain in perpetuity. Two of the key landforms are waste rock dump facilities (WRDF) and tailings storage facilities (TSFs), both of which typically require robust investigation and design as part of closure planning, followed by in depth engineering and environmental oversight during design, implementation and monitoring. However, in contrast to TSF design, few of the closure guidelines and standards provide clear direction on the level of rigour that closure practitioners, regulators and site owners should adopt during the closure planning process. One aspect of the TSF design process that supports identification of an appropriate level of rigour during the planning process is assignment of Consequence categories. This has become an integral part of the design process, providing direction on the design criteria that should be adopted. A candidate system for assigning Consequence categories to landform closure planning projects is presented, along with candidate criteria/design requirements that could be considered for each Category. Three examples of how the Consequence Category system could be applied are also provided.
Peter Chapman - One of the best experts on this subject based on the ideXlab platform.
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A case for Consequence categories to guide the closure design of landforms
Proceedings of the 13th International Conference on Mine Closure, 2019Co-Authors: Peter Chapman, André KempAbstract:The legacy of many mine sites is that landforms will, in general, remain in perpetuity. Two of the key landforms are waste rock dump facilities (WRDF) and tailings storage facilities (TSFs), both of which typically require robust investigation and design as part of closure planning, followed by in depth engineering and environmental oversight during design, implementation and monitoring. However, in contrast to TSF design, few of the closure guidelines and standards provide clear direction on the level of rigour that closure practitioners, regulators and site owners should adopt during the closure planning process. One aspect of the TSF design process that supports identification of an appropriate level of rigour during the planning process is assignment of Consequence categories. This has become an integral part of the design process, providing direction on the design criteria that should be adopted. A candidate system for assigning Consequence categories to landform closure planning projects is presented, along with candidate criteria/design requirements that could be considered for each Category. Three examples of how the Consequence Category system could be applied are also provided.
Thomas W. Fennessey - One of the best experts on this subject based on the ideXlab platform.
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New risk-Consequence rockfall hazard rating system for Missouri highways using digital image analysis
Environmental & Engineering Geoscience, 2005Co-Authors: Norbert H. Maerz, Ahmed M. Youssef, Thomas W. FennesseyAbstract:The Missouri Rockfall Hazard Rating System (MORFH RS) is a new scheme for rating rockfall hazards along the roads of the Missouri State highway system. Existing rating systems used in other jurisdictions focus on the risk of failure and ignore the Consequence of failure, or they lump the ratings for risk and Consequence together. Missouri highway rock cuts tend to have low heights but are typically highly weathered, with special problems from karst and paleokarst. In MORFH RS, risk and Consequence factors are given equal weight but isolated from each other. MORFH RS utilizes two phases: 1) identification of the most potentially problematic rock cuts using mobile digital video logging; 2) characterization and prioritization of remediation for the potentially problematic rock cuts identified in phase 1, using MORFH RS. In phase 2 four types of parameters are evaluated: 1) parameters that can be measured on computer scaled video images; 2) parameters which are descriptive, and need field evaluation; 3) parameters which are obtained from MODOT records; 4) conditional parameters which are evaluated under specific conditions. Only those parameters were selected that were deemed meaningful and/or relatively easy to measure or estimate. Parameters were assigned to either a risk or Consequence Category or both. MORFH RS has been tested on sections of Missouri highways. About 300 rock cuts were evaluated and used to prepare, modify, test, and verify the system. Sensitivity analysis of the system was done by quantifying potential errors in the video measurements and by a rating comparison of 12 MODOT and University of Missouri-Rolla (UMR) personnel on 10 rock cuts along Highway 63.
J. Lewin - One of the best experts on this subject based on the ideXlab platform.
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Refurbishing and Upgrading Old Spillway Gate Installations
2020Co-Authors: J. LewinAbstract:SYNOPSIS Many old spillway gate systems are approaching the limit of operating life in their present form. The majority were designed and constructed robust, with little or no redundancy, and incorporate many single point and common cause failures. Design deficiencies, age and degradation present a reliability risk to the dam system and the downstream population. The paper sets out the requirements for safety and reliability, how these can be attained and to what extent, recognising the wide variations in installation design and condition. The degree of reliability obtained as a result of upgrade and refurbishment must be consistent with that required by the dam Consequence Category.