Geometry of rock wedge

Entering geometry of a rock wedge using either gradient or falling line gradient direction requires definition of space orientation of the rock face, terrain (top face), slip surfaces N1 and N2 and/or tension crack, such that:

• Gradient (gradient angle) is an inclination angle α representing inclination of surface from horizontal (it may receive values from 0° to 90°)
• Gradient direction (falling line) is an angle φ between horizontal projection of the line normal to the strike direction  measured as an azimuth angle (from the north in the clockwise direction) (the falling line corresponds to inclination of the plane), it may receive values from 0° to 360° 

The program when defining space orientation of planes displays these planes using a stereographic projection.

Description of orientation of surfaces (vertical cut through a rock mass and plane projection)