Technical Specifications
Analysis Options
- Duncan Fama solution for ground reaction curve
- Carranza-Torres solution
- Vrakas and Anagnostou solution
- Lee and Pietruszczak solution
- Barbosa solution
- Vrakas (2016) solution
- Plot long-term ground reaction curve (specify strength reduction factor)
- Deterministic (safety factor) or probabilistic (probability of failure) analysis
Probabilistic Analysis
- Monte Carlo or Latin Hypercube simulation
- Random or pseudo-random sampling
- Random variables—all tunnel and rock parameters can be defined as random variables
- Statistical distributions—normal, uniform, triangular, beta, exponential, lognormal, gamma
- Histogram, cumulative, and scatter plots
- User-defined plot variables
- Best-fi t distribution and regression line
- Highlight support failure on histogram and scatter plots
- One-click export of charts to Excel
Rock Parameters
- Elastic properties: Young’s Modulus, Poisson’s Ratio
- Strength properties: Mohr-Coulomb or Generalized Hoek-Brown
- Equivalent Mohr-Coulomb parameters can be calculated from Hoek-Brown parameters (GSI, mi, intact UCS, D)
- Built-in charts and tables help estimate suitable values of GSI, mi, intact UCS, and D
- Peak and residual strength parameters for Generalized Hoek-Brown criterion
Support
- Pre-defined support types for rock bolts, steel sets, and shotcrete
- Combine multiple support types (e.g., rock bolts and shotcrete)
- Simple parametric analysis —add, change, or remove support with a few mouse clicks
- User-defined support
- Support installation—specify distance from face or tunnel convergence
- Interactive positioning of support
- Longitudinal deformation profile —built-in or user-defined function
- Custom support option for each of the three support types
- Steel set reinforcement database
Tunnel Parameters
- Tunnel radius
- In-situ stress
Viewing Options
- Ground reaction and support reaction views
- Tunnel section and plastic zone radius views
- Customize display options
- Export image fi les
- Info Viewer summary of analysis results