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Qualitative analysis: Through the analysis of the slope size and shape, the geological structure of the slope, the geologic environment and the process of forming the slope, the soil properties, deformation and fracture of the slope and the factors affect its stability and then determine the slope evolution phase and stable conditions. Limit equilibrium analysis: The kinematic approach of limit analysis is explored in three-dimensional 2D stability analysis of slopes. The stability of the slope can be calculated by analyzing the possible sliding surface and simplifying the stress on the sliding surface to a uniform distribution, and then calculate the stability coefficient of the slope (Michalowski, 1989).
Alternatively, the kinematic approach yields the lower estimate of the stability factor cu/λH. The limit equilibrium methods use the Mohr-Coulomb expression in order to identify the shear strength along the sliding surfaces. Thus, the shear stresses which the soil fails in the shear are referred to the shear strength of soil. The limit equilibrium state exists when the mobilized shear strength is expressed as the fraction of shear strength. The shear strength at the moment of the failure is mobilized fully along with the failure when the critical conditions state is reached. It is expressed usually by the Mohr Coulomb linear relationship. The shear strength relies on the effective normal stress and type of soil and the mobilized shear stress relies on the external forces that act on the soil mass.