 |
  |
|
    
|
|
Estimation of Rock Parameters
To assist with the determination of appropriate input parameters for
the Generalized Hoek-Brown failure criterion, RocSupport
provides convenient built-in charts and tables. These allow you to
obtain reasonable estimates of Geological Strength Index (GSI), intact
rock constant mi, intact uniaxial compressive strength (UCS) and Disturbance
Factor (D). Simply select the Pick button for the parameter of interest
and the corresponding chart or table will appear.
Select a Pick button to view a chart or table.
|
|
| |
 |
| |
Estimation of GSI
Estimates of GSI (Geological Strength Index) can be obtained based
on the rock structure and surface conditions. Two distinct charts
are available, for either General or Flysch rock types.
GSI chart for General rock types.
GSI chart for Flysh rock types.
|
|
|
|
|
Estimation of mi
The intact rock constant mi can be estimated with the following dialog.
Values of mi are provided for over 40 different rock types. For further
convenience, the list can be filtered by rock type (sedimentary, igneous
or metamorphic) and/or texture.
Dialog for estimation of mi.
|
|
|
|
|
Estimation of UCS
The intact uniaxial compressive strength can be estimated with the
following dialog. Based on the rock type and field estimates of strength,
approximate values of UCS can be determined.
Dialog for estimation of UCS.
|
|
|
|
|
Estimation of Disturbance Factor
The Disturbance Factor (D) used in the Generalized Hoek-Brown failure
criterion can be estimated with the help of the following dialog,
which presents descriptions and images of typical excavation conditions.
Dialog for estimation of Disturbance Factor.
|
|
|
|
