Rocscience Software

Rocscience RocSupport

Support Estimation Using Ground Reaction Curves

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.

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.

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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