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October 18, 1996
4
IP3-1253
Minimum Base Exit Angle, α
Specify the minimum allowable base exit angle (measured positive upwards from the
horizontal X axis) at which the slip surface exits the base of the wall or slope. An angle
of negative 10 degrees will generally be suitable. If the output indicates that deepseated slip surfaces require nail support or are providing the critical (minimum) factors
of safety, then the minimum exit angle should be lowered to negative 20 degrees or
less. Units are (Degrees).
X Search Limit (left)
Specify the minimum X-coordinate for the considered slip surfaces to exit the ground
surface. If this point is specified to the left of the top of wall or slope, GoldNail will
assume that the minimum X-coordinate corresponds to the top of wall or slope. Units
are (L).
X Search Limit (right)
Specify the maximum X-coordinate for the considered slip surfaces to exit the ground
surface. Units are (L).
# of X search Exit Points
Specify the number of exit points (including X Search Limit (left) and X Search Limit
(right) to be considered in the slip surface analysis. If 1 is specified only X Search Limit
(left) will be used as an exit point. In general, for soil nail wall design, the number of Xsearch exit points should be equal to the square root of the specified number of slip
surfaces to be analyzed (e.g. specify 10 exit points if 100 slip surfaces are specified).
GoldNail will automatically select the exit points between the left and right X search
limits.
Geometry Screen
0
Horizontal Distance
20
40
0
10
Depth
2.2
20
30
40
Wall Segment
Surface Segment
Internal Segment
Nodes
Nodes
The problem geometry is defined by specifying nodes to describe the limits of the wall
or slope, the ground surface, and any internal material property (soil strength, soil unit
weight, pullout resistance) boundaries. Each node must be defined in terms of its X,Y
coordinates.