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| Titel |
Slope stability assessment of weathered clay by using field data and computer modelling: a case study from Budapest |
| VerfasserIn |
P. Görög, Á. Török |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 7, no. 3 ; Nr. 7, no. 3 (2007-06-15), S.417-422 |
| Datensatznummer |
250004546
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| Publikation (Nr.) |
 copernicus.org/nhess-7-417-2007.pdf |
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| Zusammenfassung |
| A future development site of a housing estate, an abandoned-brick yard with
clayey slopes was studied in details to assess slope stability and to
calculate the factor of safety. The Oligocene clay, the former raw material,
is divided into two different geotechnical units in the clay pit. The lower
one consists of grey impermeable clays while the upper unit is characterised
by yellowish weathered clay having a limited permeability. At some
localities the topmost weathered clay layers are covered by loess, and slope
debris. Parts of the former pit were also used as a landfill site. The slope
stability analyses were performed based on borehole information and
laboratory analyses in order to provide necessary engineering geological
data for further site development and urban planning. Two geotechnical codes
Plaxis and Geo4 were used to model the slope failures and assess the slope
stability. The aim of using two different approaches was to compare them
since Plaxis uses finite elements modelling while Geo4 uses conventional
calculation methods to obtain circular and polygonal slip surfaces.
According to model calculations and field data, the main trigger mechanisms
of landslides seem to be high pore pressure due to rainwater and small slope
debris covered springs. The slip surface is located at the boundary zone of
yellow weathered and grey unaltered clay. Two computer models gave very
similar results; although Plaxis provides combined safety factor which is
slightly more pessimistic when compared to the safety factor obtained by
using Geo4. |
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