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| Titel |
Block ground interaction of rockfalls |
| VerfasserIn |
Axel Volkwein, Werner Gerber, Peter Kummer |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250131142
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| Publikation (Nr.) |
 EGU/EGU2016-11513.pdf |
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| Zusammenfassung |
| During a rockfall the interaction of the falling block with the ground is one of the most
important factors that define the evolution of a rockfall trajectory. It steers the rebound, the
rotational movement, possibly brake effects, friction losses and damping effects. Therefore, if
most reliable rockfall /trajectory simulation software is sought a good understanding of the
block ground interaction is necessary.
Today’s rockfall codes enable the simulation of a fully 3D modelled block within a full
3D surface . However, the details during the contact, i.e. the contact duration, the
penetration depth or the dimension of the marks in the ground are usually not part of the
simulation.
Recent field tests with rocks between 20 and 80 kg have been conducted on a grassy slope
in 2014 [1]. A special rockfall sensor [2] within the blocks measured the rotational velocity
and the acting accelerations during the tests. External video records and a so-called
LocalPositioningSystem deliver information on the travel velocity. With these data not only
the flight phases of the trajectories but also the contacts with the ground can be analysed.
During the single jumps of a block the flight time, jump length, the velocity, and
the rotation are known. During the single impacts their duration and the acting
accelerations are visible. Further, the changes of rotational and translational velocity
influence the next jump of the block. The change of the rotational velocity over the
whole trajectory nicely visualizes the different phases of a rockfall regarding general
acceleration and deceleration in respect to the inclination and the topography of the
field.
References:
[1] Volkwein A, Krummenacher B, Gerber W, Lardon J, Gees F, Brügger L, Ott T (2015)
Repeated controlled rockfall trajectory testing. [Abstract] Geophys. Res. Abstr. 17:
EGU2015-9779.
[2] Volkwein A, Klette J (2014) Semi-Automatic Determination of Rockfall Trajectories.
Sensors 14: 18187-18210. |
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