Question

Consider the following assumptions for slope stability analysis:

1. Friction is fully mobilized.
2. Effective stress analysis is adopted.
3. Total stress analysis is used.
4. Resultant 'R' passes through the centre of the circle.
5. Resultant 'R' is tangential to the friction circle.
The assumptions necessary for friction circle method of analysis would include

• A. 1, 3 and 4
• B. 1, 3 and 5
• C. 2 and 4
• D. 2 and 5

Answer 1

The correct option is B 1, 3 and 5

The friction circle method of stability analysis of slope is applicable to $c-\varphi$ soils. Following are the assumptions:

• Method is based on total stress analysis.
• Enables the angle of shearing resistance to be taken into account.
• Slip surface is circular.
• Frictional resistance is fully mobilized along the slip surface.
• Resultant R is tangential to the friction circle.