Modelling of Anisotropy in Slope Stability Problems - A study about slope stability in Göta Älv valley
Typ
Examensarbete för masterexamen
Program
Infrastructure and environmental engineering (MPIEE), MSc
Publicerad
2020
Författare
Svensson, Andrea
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
The purpose of this Master’s thesis is to analyse the effects of considerations for
anisotropy in slope stability problems using two different calculation models. The
slope stability is investigated for a slope located in Göta Älv valley with high representation
of quick clay. From Göta Älv valley are field and laboratory test data
retrieved and evaluated. The retrieved test results from laboratory are from Triaxial,
Oedometer and CRS tests. All data are used for the purpose of modelling
in two different softwares: Geostudio SLOPE/W and PLAXIS 2D. In PLAXIS 2D
the Creep-SCLAY1S model is used for the calculation of the slope stability. Results
retrieved defines different slip surfaces and factors of safety. For the same slope
section, the factors of safety are calculated to be between 1.15-1.18 in Geostudio
SLOPE/W and between 1.36-3.0 in PLAXIS 2D. All laboratory test results are used
to model anisotropy when using Creep-SCLAY1S since the model uses input parameters
such as stress ratio, state variable for anisotropy and evaluation of anisotropy.
For the calculation in Geostudio SLOPE/W anisotropy is considered through dividing
the soil into vertical layers. The main conclusion is that Creep-SCLAY1S
considers anisotropy in a more detailed way meanwhile are more assumptions and
simplifications used for Geostudio SLOPE/W. The certainty of the factor of safety
is important for slope stability analyses both for research and ethical purposes.
Beskrivning
Ämne/nyckelord
Slope stability , Creep-SCLAY1S , PLAXIS 2D , Geostudio SLOPE/W , Göta Älv