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Display Capabilities: Failure Envelope Plots
RocLab plots the rock mass failure envelopes in both principal stress space (sigma1 vs. sigma3) and shear-normal stress space (sigma normal vs. Tau). By default, both principal stress and shear-normal plots are displayed, but the user can choose to display either plot type on its own by selecting the desired plot type from the toolbar, the Analysis menu or the right-click pop-up menu.
Both Principal stress and Shear-Normal stress plots are displayed by default
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Display Capabilities: Equivalent Mohr-Coulomb Parameters
In addition to the Hoek-Brown failure criterion parameters (mb, s and a), RocLab always calculates equivalent Mohr-Coulomb parameters (cohesion and friction angle) for the rock mass. The best-fit Mohr-Coulomb strength envelope is determined over a stress range that the user can define based on the application (i.e. tunneling or slope stability).
The calculated Mohr-Coulomb parameters are listed in the sidebar
The corresponding Mohr-Coulomb envelope (the blue curve) can be viewed on the plot as well
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Display Capabilities: Interactive Data Input
If the user click on the arrows with the mouse to change the input data, the RocLab calculations are instantly performed. All output data is immediately recalculated, and the failure envelope plots are redrawn each time the mouse is clicked on either the up or the down arrow.
Interactive Data Input by clicking on the up/down arrows
This allows the user to interactively observe the effect of parameter changes, on the shape of the failure envelopes, and the output values.
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Display Capabilities: Stress Sampler
The stress sampler option allows the user to graphically obtain the exact stress coordinates at any point along the failure envelopes.
Sample the Hoek-Brown or Mohr-Coulomb failure envelopes
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Display Capabilities: Instantaneous MC Sampler
The Instantaneous Mohr-Coulomb Sampler option allows the user to graphically obtain the instantaneous Mohr-Coulomb parameters (cohesion and friction angle) at any point along the Hoek-Brown failure envelopes.
Instantaneous MC Sampler
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Display Capabilities: Export Data/Images
RocLab allows the user to export data for further analysis or report writing. It lets the user copy the data / plots to the clipboard for easy import into Microsoft Word or other word processors or image editing programs.
The Copy option copies the plots and the Copy Data option copies the data to the clipboard
The Copy Data function in the Sidebar
Also, RocLab enables the user to export the data / plots directly into Microsoft Excel by clicking the Excel charting button on the toolbar.
A Sample Excel chart generated by RocLab
The user can save the plots to a JPEG or BMP image file using the Export Image File option under the File menu or in the right-click pop-up menu.
The Export Image File option under File menu
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Display Capabilities: Display Options
The appearance of the plots may be customized with Display Options, zooming, and other options. RocLab allows the user to change colors, fonts, line thickness of the plots and toggle grid overlay, plot title, input data, bounding box, graph icons, and Mogi's Line.
The Display Options Dialog
The effect of adding grid overlay, bounding boxes, project title, graph icons, and cropping axes
Zooming
The Zoom options in the toolbar allow the user to customize the zooming of the plot axes. The Zoom Extents option will automatically scale the axes of the failure envelopes, so that all possible failure envelopes, for the current value of sigci, will be visible on the plot. The Zoom Extents option is useful for interactive demonstration of parameter changes on the failure envelope.
The effect of Zoom Extents
Mogi's Line
Mogi's Line defines the ratio of major and minor effective principal stresses at which there is a transition from brittle to ductile failure. This line is simply defined by sig1 / sig3 = 3.4, and is plotted as a green line on the principal stress plot, when the Mogi's Line option is selected in the Display Options dialog.
If the principal stress failure envelope lies above Mogi's line, this indicates a brittle failure mode. If the principal stress failure envelope lies below Mogi's line, this indicates a ductile failure mode. This may occur with low values of GSI, for example.
Mogi's line is shown as a green line on the principal stress plot
Grayscale
The Grayscale option allows the user to convert the entire view to grayscale (black and white) with a single mouse click. This can be useful when black and white screen captures or printouts are necessary.
Effect of grayscale:
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