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Rock Stability
Plane slip surface
Failure on the plane slip surface is manifested by a rock block sliding down along this surface. The solution procedure requires determination of the normal force N acting on the slip surface, the shear force Tact (active) and the resisting shear force Tres (passive).
Forces on the slip surface
The shear strength parameters and the normal force N acting on the slip surface are the main input data for the determination of the resisting shear forces Tres. Calculation of the active shear force Tact and the normal force N is further influenced by the weight of block (depends on the geometry and bulk weight of rock), anchorage, surcharge, influence of water and seismic effects. The active force and the normal force are determined as a sum of all forces entering the analysis.
The program offers several types of plane slip surfaces:
| - smooth |
| - undulating |
| - stepped |
The slip surface can be specified with a tension crack.
The resulting verification can be carried out either according to the theory of limit states or factors of safety.
Literature:
Charles A. Kliche:Rock slope stability, SME, USA, 1999,ISBN 0-87335-171-1
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