Cone Friction Concept
Friction cone concept is a combination of the kinematic and kinetic calculation method, which is used to find potential slip surfaces of failure. The principle of solution is shown in the following figure.
The friction cone concept for a block resting on an inclined plane (polygonal slip surface)
The resistant forces are described using the following condition:
block area resting on the slip surface
cohesion on the sliding surface
vector due to self-weight of the block (self-weight resultant of the rock block)
normal to the slip plane
angle of internal friction
Goodman, R. E.: Introduction to Rock Mechanics: John Wiley & Sons, New York, 1989, 562 p.