Modelling of Anisotropy in Slope Stability Problems - A study about slope stability in Göta Älv valley
Examensarbete för masterexamen
Infrastructure and environmental engineering (MPIEE), MSc
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.
Slope stability , Creep-SCLAY1S , PLAXIS 2D , Geostudio SLOPE/W , Göta Älv