The method of slices for the stability of slope

Concept:

Slope Stability Analysis Methods are as follows:

1. Culmann Method

• It is not widely used because it is demonstrated that plane surfaces of sliding are noted only with very steep slopes, and for relatively flat slopes the surfaces of sliding are almost always curved.

2. The Zero angle of Shearing Resistance Method

• This method of slope stability analysis is based on the assumption that the plane of failure is in the form of a circular arc. It is a practical method for the evaluation of the short-term stability of saturated clay slopes.

3. The Swedish Method of Slices

• It is considered where the effective angle of shearing resistance is not constant over the failure surface, such as in zoned earth dams where the failure surface might pass through several different materials.
• The method of slices is a general approach that is equally applicable to homogeneous soils, stratified deposits, partially submerged cases, and non-uniform slopes.
• Seepage effects also can be considered.

4. Bishop Method of Slices

• In the Bishop method of slices, the analysis is conducted in terms of stresses rather than forces which are used in the ordinary method of slices.
• The main difference between this method and the Ordinary Method of Slices is that the resolution of forces takes place in the vertical direction instead of a direction normal to the arc.
• The simplified Bishop method of slices provides a safety factor that is considerably close to those evaluated using more rigorous methods of analysis.