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Cone Friction Concept

Friction cone concept is a combination of kinematic and kinetic calculation method, which is used to find potential slip surface 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 following condition:

where:

A

-

block area resting on the slip surface

c

-

cohesion on the sliding surface

W

-

vector due to self weight of block (self weight resultant of the rock block)

N

normal to the slip plane

ϕ

-

angle of internal friction

Literature:

Goodman, R. E.: Introduction to Rock Mechanics: John Wiley & Sons, New York, 1989, 562 p.