Slope Stability Analysis of Unsaturated Soil with Fully Coupled Flow-Deformation Analysis

Slope stability analysis of unsaturated soil requires to simultaneously compute deformation and groundwater flow with time dependent boundary conditions (fully coupled flow-deformation analysis). This paper evaluates the effects of hydraulic parameters of soils and rainfall on slope stability. The shear strength of the unsaturated soil will be examined based on Bishop’s effective stress concept considering suction. Four soils with different hydraulic characteristics from USDA series with Van Genuchten parameters are used in analysis. The finite element  ethod with shear strength reduction technique was used to evaluate the stability of the slope. The results show that the hydraulic parameters have a significant influence on the stability during a period of rainfall. For soils with low permeability, factor of safety (FOS) did not reduce significantly during rain infiltration. However, soils with high permeability show a significant decrease of FOS during rainfall infiltration.

Dibuat oleh : Indra Noer Hamdhan,  Helmut F. Schweiger

E-mail: indranh@itenas.ac.id, helmut.schweiger@tugraz.at

Kata Kunci :

Keterangan :  Makalah ini  dimuat pada Proceedings IAMG 2011 Conference, Mathematical Geosciences at the Crossroads of Theory and Practice, Salzburg Austria 5-9 September 2011.

Peer-reviewed IAMG 2011 publication, ISBN: 978-3-200-02566-0, pp1552.)

Slope Stability Analysis of Unsaturated Soil with Fully Coupled Flow-Deformation Analysis