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| Titel |
Quantification of rock slope terrain properties |
| VerfasserIn |
Axel Volkwein, Werner Gerber |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250143783
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| Publikation (Nr.) |
 EGU/EGU2017-7537.pdf |
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| Zusammenfassung |
| Rockfall trajectory simulation codes need information on the terrain properties to formulate
appropriate rebound models. Usually, the manuals of rockfall simulation codes give sketches
or photographs of terrain samples [1,2]. Based on these the user can select suitable terrains
for the simulation area. We now would like to start a discussion whether it is possible to
numerically quantify the terrain properties which would make the ground assignment more
objective.
Different ground properties play a role for the interaction between a falling rock and the
ground:
∙ Elastic deformation
∙ plastic deformation
∙ Energy absorption
∙ friction ∙ hardness
∙ roughness
∙ surface vs. underground
∙ etc.
The question is now whether it is possible to quantify above parameters and to finally provide
tables that contain appropriate simulation parameters. In a first attempt we suggest different
methods or parameters that might be evaluated in situ:
∙ Small scale drop tests
∙ Light weight deflectometer (LWD)
∙ Particle sizes
∙ Sliding angle ∙ Particle distribution
∙ Soil cover
∙ Water content
Of course, above measurements will never perfectly fit to different mountain slopes.
However, if a number of measurements has been made their spreading will give an idea on
the natural variability of the ground properties. As an example, the following table gives an
idea on how the ME and Evd values vary for different soils.
Table 1: LWD measurements on different soil types [3]
Ground type Soil layer Soil humidityEvd (median)σ (median)Evd (average)
Humus-carb. < 10cm dry 17.4 6.8 15.6
Regosol 10 − 30cm dry 8.6 3.9 9.4
Brownish 30 − 50cm dry 12.1 3.2 11.7
Calcaric 30 − 50cm dry 7.5 3.3 7.0
Acid brownish70 − 100cmdry 7.8 2.1 7.7
Fahlgley 10 − 30cm dry 9.2 4.0 7.7
References
[1] Bartelt P et al (2016) RAMMS::rockfall user manual v1.6. SLF, Davos.
[2] Dorren L.K.A., 2015. Rockyfor3D (v5.2) revealed - Transparent description of the complete 3D
rockfall model. ecorisQ paper (www.ecorisq.org): 32 p.
[3] Hoffmann P. (2015) Härte von Böden. Bsc thesis, ZHAW Waedenswil. |
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