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Tunnel Axis Plots
The Tunnel Axis Plot option allows you to automatically vary the Tunnel
Axis Orientation over a range of values and generate a plot of the
results. This allows you to examine the relationship between Tunnel
Axis Orientation and output parameters (e.g. Required Support Pressure,
Maximum Wedge Volume, Minimum Factor of Safety, etc) and quickly determine
the most critical tunnel orientation(s) with respect to any output
variable.
If your project has the flexibility to vary the Tunnel Axis Orientation
or if the Tunnel Axis Orientation varies continuously (e.g. a curved
tunnel or a spiral ramp), then the Tunnel Axis Plot can be a very
useful tool.
There are 3 types of plot that can be created: Contour Plot, 3D Chart
or 2D Chart.
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Tunnel Axis Plots: Contour Plot
If both Trend and Plunge
are variables, then you can view a Contour Plot representation of
the results. On the Contour Plot, Trend and Plunge are plotted on
the horizontal and vertical axes respectively, and the contours represent
the value of a variable (e.g. Maximum Wedge Volume) over the range
of orientations analyzed.
The range of Trend and Plunge can be customized by the user, so the
plot only reflects the actual range of possible Tunnel Axis Orientations.
Contour Plot of Trend / Plunge versus Maximum Wedge Volume.
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Tunnel Axis Plots: 3D Chart
An alternative to the Contour Plot is the 3D Chart View. Like the
Contour Plot, the 3D chart is only available if both Trend and Plunge
are variables. By default, a 3D Chart will be generated if your
Data to Plot is integer (e.g. Number of Falling Wedges).
A 3D Chart can be rotated for viewing at any angle by clicking and
holding the left mouse button and moving the mouse. The viewing
angle of the chart will follow the mouse movement.
3D Chart of Trend / Plunge versus Required Support Pressure.
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Tunnel Axis Plots: 2D Chart
If you are only varying one orientation (i.e. Trend (constant Plunge)
or Plunge (constant Trend)), then a 2D Chart will be generated. For
example, in the following figure, the Tunnel Trend is varied from
0 to 90 degrees (at constant Plunge) and the Maximum Wedge Volume
is plotted for each orientation. The number of orientation intervals
(data points) used to generate the plot can be user-specified.
Tunnel Trend versus Maximum Wedge Volume.
On a 2D Chart you can also plot a secondary data type using the Bubble
Size option. By default, no secondary data is plotted (as shown in
the above figure). If you select a data type from the Bubble Size
drop-list in the sidebar, then each data point on the 2D Chart will
be plotted as a circle (or "bubble"), where the size of
the bubble represents the magnitude of the secondary data type at
that point on the plot.
Tunnel Trend versus Maximum Wedge Volume. Bubble size
indicates relative magnitude of Required Support Pressure.
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Tunnel Axis Plots: Data to Plot
By default, the most commonly used analysis results will always be
available for plotting on the Tunnel Axis Plot, including:
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Required Support Pressure
Minimum Factor of Safety
Maximum Wedge Volume
Number of Falling Wedges
Number of Sliding Wedges
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In addition to the default data types, a User Data option exists.
This allows you to create virtually any function from the basic data
types and plot the results of this function, versus the Tunnel Axis
Orientation. Once a User Data function is defined, it can be plotted
just like any of the default data types by selecting the function
name from the drop-list of Data to Plot in the sidebar.
Dialog for defining User Data functions.
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