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Data Input/Output: Hoek-Brown Input and Output Parameters
Using the following Hoek-Brown classification parameters as input:
the unconfined compressive strength of intact rock sigci
the geological strength index GSI
the intact rock parameter mi and
the disturbance factor D
RocLab determines the generalized Hoek-Brown strength parameters of a rock mass:
Input sigci, GSI, mi, and D to calculate the Generalized Hoek-Brown failure envelope parameters mb, s and a
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Data Input/Output: Estimation of Input Parameters
Each of the 4 input parameters (sigci, GSI, mi and D) can be conveniently estimated from built-in charts and tables, based on rock type, geological conditions, etc.
These charts and tables are accessed by selecting the pick button located beside each of the input parameter edit boxes in the side bar.
Click on the "Pick" buttons located beside the input parameters in the side bar
When you select a "Pick" button, a table or chart will appear, allowing the user to determine a suitable value for the desired parameter. Once a value is selected in the dialog, the value will be automatically loaded into the input data area and the RocLab calculation will be carried out automatically.
Intact Uniaxial Compressive Strength Chart
GSI chart for General rock type
GSI chart for Flysch rock type
Pick Mi Value chart
Pick Disturbance Factor dialog for both "Tunnels" and "Slopes" applications
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Data Input/Output: Triaxial Lab Data Input
Another feature of RocLab is the ability to input triaxial lab test data (sigma1 / sigma3 data pairs) in order to determine the intact rock parameters sigci and mi.
The data can be entered directly into a spreadsheet in the dialog, pasted from the clipboard, or the data can be imported from various file formats, by selecting the Import button.
The parameters sigci and mi are obtained by performing a curve fit of the lab data, using the Marquardt-Levenberg fitting technique. Obtaining values of sigci and mi from triaxial lab test data is recommended, if such data is available. If triaxial lab data is not available, values of sigci and mi can always be estimated in RocLab, using the Pick dialogs.
Calculating sigci and mi from Lab Data
Import Triaxial lab Data from Microsoft Excel, RocData or RocLab Files.
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Data Input/Output: 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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Data Input/Output: Rock-mass Parameters Calculation
RocLab calculates rock-mass parameters such as tensile strength, uniaxial compressive strength, global strength and deformation modulus.
Calculated rock-mass parameters are listed in the sidebar
Rock-mass parameters can be listed on the plot by toggling the "display options"
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Data Input/Output: Metric and Imperial Units
RocLab allows the user to work with either Metric or Imperial units. All data entries and calculations will change accordingly once the unit system is switched in the Project Settings Dialog Box. The user can choose between megapascals (MPa, metric), Kilopounds per square foot (ksf, Imperial) and Kilopounds per square inch (ksi, Imperial) unit systems.
Switch the Stress Units in the Project Settings Dialog
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