The Experts below are selected from a list of 11157 Experts worldwide ranked by ideXlab platform
T. W. J. Van Asch - One of the best experts on this subject based on the ideXlab platform.
-
Defining evacuation travel times and safety areas in a debris flow Hazard Scenario.
Science of The Total Environment, 2020Co-Authors: Raquel Melo, Susana Pereira, Ricardo A. C. Garcia, José Luís Zêzere, Sérgio Oliveira, S. C. Oliveira, Aldina Piedade, Pedro Santos, T. W. J. Van AschAbstract:Debris flows are one of the most Hazardous types of landslides in mountain regions. In the upper part of the Zezere valley (Serra da Estrela, Portugal) several debris flows events occurred in the last 200 years, some of them causing loss of lives and material damages. In this work, a methodology for pedestrian evacuation modelling, in a debris flow Hazard Scenario, was implemented. A dynamic run-out model, developed in previous studies, was used to evaluate the debris flows velocities, thickness of the deposits and extent of the mobilized material. The buildings potentially affected by the impact of debris flows were identified and the potentially exposed population was estimated by applying a dasymetric distribution. The results lead to the conclusion that, in the study area, the elderly are those who are most exposed to debris flows. Furthermore, the time lapse between the debris flows initiation and the arrival at the buildings at risk was estimated, allowing to account for the overall number of buildings where the evacuation time takes longer than the debris flows arrival. Additionally, the safe areas within the study area were identified, and several safe public buildings with the capacity to gather a large number of persons were selected. Considering that the study area is located in a mountain region, characterized by steep slopes, the evacuation modelling was performed based on an anisotropic approach, in order to consider the influence of slope direction on travel costs. At the end, three pedestrian evacuation travel time Scenarios, based on different walking speeds to accommodate residents with different ages in safer places, were compared and the results mapped. The implemented methodology is not local dependent, which allows its reproduction elsewhere.
Raquel Melo - One of the best experts on this subject based on the ideXlab platform.
-
Defining evacuation travel times and safety areas in a debris flow Hazard Scenario.
Science of The Total Environment, 2020Co-Authors: Raquel Melo, Susana Pereira, Ricardo A. C. Garcia, José Luís Zêzere, Sérgio Oliveira, S. C. Oliveira, Aldina Piedade, Pedro Santos, T. W. J. Van AschAbstract:Debris flows are one of the most Hazardous types of landslides in mountain regions. In the upper part of the Zezere valley (Serra da Estrela, Portugal) several debris flows events occurred in the last 200 years, some of them causing loss of lives and material damages. In this work, a methodology for pedestrian evacuation modelling, in a debris flow Hazard Scenario, was implemented. A dynamic run-out model, developed in previous studies, was used to evaluate the debris flows velocities, thickness of the deposits and extent of the mobilized material. The buildings potentially affected by the impact of debris flows were identified and the potentially exposed population was estimated by applying a dasymetric distribution. The results lead to the conclusion that, in the study area, the elderly are those who are most exposed to debris flows. Furthermore, the time lapse between the debris flows initiation and the arrival at the buildings at risk was estimated, allowing to account for the overall number of buildings where the evacuation time takes longer than the debris flows arrival. Additionally, the safe areas within the study area were identified, and several safe public buildings with the capacity to gather a large number of persons were selected. Considering that the study area is located in a mountain region, characterized by steep slopes, the evacuation modelling was performed based on an anisotropic approach, in order to consider the influence of slope direction on travel costs. At the end, three pedestrian evacuation travel time Scenarios, based on different walking speeds to accommodate residents with different ages in safer places, were compared and the results mapped. The implemented methodology is not local dependent, which allows its reproduction elsewhere.
Arno Thut - One of the best experts on this subject based on the ideXlab platform.
-
chienberg tunnel rehabilitation using yielding elements of the section in keuper sediments affected by heave chienbergtunnel instandsetzung der hebungsstrecke im gipskeuper mit knautschkorpern
Geomechanik Und Tunnelbau, 2010Co-Authors: Flavio Chiaverio, Arno ThutAbstract:Rocks containing clay and anhydrite exhibit the property of increasing their volume by absorbing water. The paper first discusses the mechanisms causing swelling and outlines their effects on tunnels. Next the Hazard Scenario of heaving of the tunnel tube as a whole, the structural consequences of this and the concept of the Modular Yielding System for tunnelling in stretches where heave is unavoidable are discussed. Taking the case of the Chienberg road tunnel in Switzerland, the paper also reports on experience during construction and field measurements after putting the repaired sections into operation. Special attention is given to the technical aspects of yielding supports with cement as a basic constituent for loads up to 10 MN and a yielding capacity of up to 50 %. Ton- und anhydritfuhrende Gesteine haben die Eigenschaft, ihr Volumen durch Aufnahme von Wasser zu vermehren. Der Beitrag behandelt einleitend die Mechanismen, die den Quellvorgang auslosen und die Auswirkungen des Quellvorgangs auf Tunnel. Anschliesend wird das Gefahrdungsbild der Hebungen der Tunnelrohre als Ganzes, deren Folgen auf die Tragkonstruktion und das Konzept des modularen Knautschsystems] fur den Tunnelbau in unvermeidbaren Hebungsstrecken erortert. Am Beispiel des Chienbergtunnels in der Schweiz wird auch uber Bauerfahrung und Feldmessungen nach der Inbetriebnahme der sanierten Strecken berichtet. Besondere Aufmerksamkeit wird den technischen Merkmalen von Knautschkorpern auf Zementbasis fur Belastungen von bis zu 10 MN und einem Stauchvermogen von bis zu 50 % gewidmet.
-
chienbergtunnel instandsetzung der hebungsstrecke im gipskeuper mit knautschkoerpern chienberg tunnel rehabilitation using yielding elements of the section in keuper sediments affected by heave
GEOMECHANICS AND TUNNELLING GEOMECHANIK UND TUNNELBAU, 2010Co-Authors: Flavio Chiaverio, Arno ThutAbstract:Ton- und anhydritfuehrende Gesteine haben die Eigenschaft, ihr Volumen durch Aufnahme von Wasser zu vermehren. Der Beitrag behandelt einleitend die Mechanismen, die den Quellvorgang ausloesen und die Auswirkungen des Quellvorgangs auf Tunnel. Anschliessend wird das Gefaehrdungsbild der Hebungen der Tunnelroehre als Ganzes, deren Folgen auf die Tragkonstruktion und das Konzept des modularen Knautschsystems fuer den Tunnelbau in unvermeidbaren Hebungsstrecken eroertert. Am Beispiel des Chienbergtunnels in der Schweiz wird auch ueber Bauerfahrungen und Feldmessungen nach der Inbetriebnahme der sanierten Strecken berichtet. Besondere Aufmerksamkeit wird den technischen Merkmalen von Knautschkoerpern auf Zementbasis fuer Belastungen von bis zu 10 MN und einem Stauchvermoegen von bis zu 50 Prozent gewidmet. (A) ABSTRACT IN ENGLISH: Rocks containing clay and anhydrite exhibit the property of increasing their volume by absorbing water. The paper first discusses the mechanisms causing swelling and outlines their effects on tunnels. Next the Hazard Scenario of heaving of the tunnel tube as a whole, the structural consequences of this and the concept of the Modular Yielding System for tunnelling in stretches where heave is unavoidable are discussed. Taking the case of the Chienberg road tunnel in Switzerland, the paper also reports on experience during construction and field measurements after putting the repaired sections into operation. Special attention is given to the technical aspects of yielding supports with cement as a basic constituent for loads up to 10 MN and a yielding capacity of up to 50 percent. (A)
Susana Pereira - One of the best experts on this subject based on the ideXlab platform.
-
Defining evacuation travel times and safety areas in a debris flow Hazard Scenario.
Science of The Total Environment, 2020Co-Authors: Raquel Melo, Susana Pereira, Ricardo A. C. Garcia, José Luís Zêzere, Sérgio Oliveira, S. C. Oliveira, Aldina Piedade, Pedro Santos, T. W. J. Van AschAbstract:Debris flows are one of the most Hazardous types of landslides in mountain regions. In the upper part of the Zezere valley (Serra da Estrela, Portugal) several debris flows events occurred in the last 200 years, some of them causing loss of lives and material damages. In this work, a methodology for pedestrian evacuation modelling, in a debris flow Hazard Scenario, was implemented. A dynamic run-out model, developed in previous studies, was used to evaluate the debris flows velocities, thickness of the deposits and extent of the mobilized material. The buildings potentially affected by the impact of debris flows were identified and the potentially exposed population was estimated by applying a dasymetric distribution. The results lead to the conclusion that, in the study area, the elderly are those who are most exposed to debris flows. Furthermore, the time lapse between the debris flows initiation and the arrival at the buildings at risk was estimated, allowing to account for the overall number of buildings where the evacuation time takes longer than the debris flows arrival. Additionally, the safe areas within the study area were identified, and several safe public buildings with the capacity to gather a large number of persons were selected. Considering that the study area is located in a mountain region, characterized by steep slopes, the evacuation modelling was performed based on an anisotropic approach, in order to consider the influence of slope direction on travel costs. At the end, three pedestrian evacuation travel time Scenarios, based on different walking speeds to accommodate residents with different ages in safer places, were compared and the results mapped. The implemented methodology is not local dependent, which allows its reproduction elsewhere.
Pedro Santos - One of the best experts on this subject based on the ideXlab platform.
-
Defining evacuation travel times and safety areas in a debris flow Hazard Scenario.
Science of The Total Environment, 2020Co-Authors: Raquel Melo, Susana Pereira, Ricardo A. C. Garcia, José Luís Zêzere, Sérgio Oliveira, S. C. Oliveira, Aldina Piedade, Pedro Santos, T. W. J. Van AschAbstract:Debris flows are one of the most Hazardous types of landslides in mountain regions. In the upper part of the Zezere valley (Serra da Estrela, Portugal) several debris flows events occurred in the last 200 years, some of them causing loss of lives and material damages. In this work, a methodology for pedestrian evacuation modelling, in a debris flow Hazard Scenario, was implemented. A dynamic run-out model, developed in previous studies, was used to evaluate the debris flows velocities, thickness of the deposits and extent of the mobilized material. The buildings potentially affected by the impact of debris flows were identified and the potentially exposed population was estimated by applying a dasymetric distribution. The results lead to the conclusion that, in the study area, the elderly are those who are most exposed to debris flows. Furthermore, the time lapse between the debris flows initiation and the arrival at the buildings at risk was estimated, allowing to account for the overall number of buildings where the evacuation time takes longer than the debris flows arrival. Additionally, the safe areas within the study area were identified, and several safe public buildings with the capacity to gather a large number of persons were selected. Considering that the study area is located in a mountain region, characterized by steep slopes, the evacuation modelling was performed based on an anisotropic approach, in order to consider the influence of slope direction on travel costs. At the end, three pedestrian evacuation travel time Scenarios, based on different walking speeds to accommodate residents with different ages in safer places, were compared and the results mapped. The implemented methodology is not local dependent, which allows its reproduction elsewhere.
