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Titel |
Channelized debris flow hazard mitigation through the use of flexible barriers: a simplified computational approach for a sensitivity analysis. |
VerfasserIn |
Andrea Segalini, Anna Maria Ferrero, Roberto Brighenti |
Konferenz |
EGU General Assembly 2013
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 15 (2013) |
Datensatznummer |
250073380
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Zusammenfassung |
A channelized debris flow is usually represented by a mixture of solid particles of
various sizes and water, flowing along a laterally confined inclined channel-shaped
region up to an unconfined area where it slow down its motion and spreads out
into a flat-shaped mass. The study of these phenomena is very difficult due to their
short duration and unpredictability, lack of historical data for a given basin and
complexity of the involved mechanical phenomena. The post event surveys allow for
the identification of some depositional features and provide indication about the
maximum flow height; however they lack information about development of the
phenomena with time. For this purpose the monitoring of recursive events has been
carried out by several Authors. Most of the studies, aimed at the determination of
the characteristic features of a debris flow, were carried out in artificial channels,
where the main involved variables were measured and other where controlled during
the tests; however, some uncertainties remained and other scaled models where
developed to simulate the deposition mechanics as well as to analyze the transportation
mechanics and the energy dissipation. The assessment of the mechanical behavior of the
protection structures upon impact with the flow as well as the energy associated to it
are necessary for the proper design of such structures that, in densely populated
area, can avoid victims and limit the destructive effects of such a phenomenon. In
this work a simplified structural model, developed by the Authors for the safety
assessment of retention barrier against channelized debris flow, is presented and
some parametric cases are interpreted through the proposed approach; this model is
developed as a simplified and efficient tool to be used for the verification of the
supporting cables and foundations of a flexible debris flow barrier. The present
analytical and numerical-based approach has a different aim of a FEM model. The
computational experiences by using FEM modeling for these kind of structures, had shown
that a large amount of time for both the geometrical setup of the model and its
computation is necessary. The big effort required by FEM for this class of problems
limits the actual possibility to investigate different geometrical configurations, load
schemes etc. and it is suitable to represent a specific configuration but it does not
allow for investigation of the influence of parameter changes. On the other hand
parametrical analysis are common practice in geotechnical design for the quoted reasons.
Consequently, the Authors felt the need to develop a simplified method (which
is not yet available in our knowledge) that allow to perform several parametrical
analysis in a limited time. It should be noted that, in this paper, no consideration
regarding the mechanical and physical behavior of debris flows are carried out; the
proposed model requires the input of parameters that must be acquired through a
preliminary characterization of the design event. However, adopting the proposed tool, the
designer will be able to perform sensitivity analysis that will help in quantify the
influence of parameters variability as commonly occurs in geotechnical design. |
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