rocscience Software

Rocscience RocSupport

Support Estimation Using Ground Reaction Curves

Logo Rocscience RocSupport

Ground Reaction Curve

Easy-to-use software for estimating deformation of circular excavations in weak rock. Given the tunnel radius, in-situ stress conditions, rock parameters and support parameters, a ground reaction curve and a support reaction curve are calculated. The intersection of these curves determines a factor of safety for the support system. Account for long term tunnel behaviour by applying a strength reduction factor to obtain a long-term Ground Reaction Curve.

Rocscience RocSupport
Rocscience RocSupport

Support Options

Install combinations of Rockbolts, Steelsets, Shotcrete, or Custom supports. Users can select from a library of predefined supports using manufacturer’s specifications. Define support installation as the distance from the tunnel face, by percentage of tunnel convergence or by tunnel displacement.

Deterministic or Probabilistic Analysis

Compute a factor of safety with deterministic analysis or probability of failure for probabilistic models using convergence-confinement analysis. Model variability in tunnel radius, in-situ stress, and rock material properties by assigning statistical distributions to variables. Create histogram, cumulative, and scatter plots of statistical data.

Rocscience RocSupport

Features in RocSupport

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

RocSupport across Applications

Estimate support requirements of tunnels in weak rock with quick parametric analysis.

Model supported or unsupported tunnels with circular sections in weak rock.

Explore the latest features in RocSupport

The Vrakas Method (2016) is a new analysis option in RocSupport used for tunnels with large-strain non-linear Generalized Hoek-Brown with dilation.

Save time with the Batch Compute feature which enables you to compute several deterministic and/or probabilistic RocSupport model files (.rsp) at once and quickly generate results to text or Excel format.

Automate a deterministic or probabilistic analysis in RocSupport by reading in various numerical input data from an Excel template, and quickly generating computed results to text or Excel format.

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