Why Choose FLAC3D?


  • Numerical stability with large displacements, including collapse
  • 64-bit architecture allows very large models to be constructed
  • 21 built-in material constitutive behaviors; more available with options
  • P2PSand for 3D dynamic and liquefaction analysis is included
  • Complex materials and pore pressure distributions
  • Assess service limit state criteria
  • Automatic factor-of-safety analysis
  • Coupled or uncoupled groundwater flow comes standard
  • FISH scripting language enables you to access, monitor, and control nearly every model and solution parameter
  • Python scripting provides the access to most model elements and a vast array of Python mathematical, engineering, and scientific libraries.
  • Optional dynamic, thermal, creep solution analyses and C++ plug-ins for custom constitutive models and function libraries
  • Built-in text editor
  • Building Blocks pane provides tools for interactive 3D model construction and meshing
  • Model pane to:
    • select model zones, faces, and structural elements which allows easy assignment of groups that can be used to define regions and boundaries,
    • specify interfaces,
    • quickly define liner structural supports, and
    • assign constitutive models and material properties.
  • Extrusion pane is a user interface for constructing 3D models from 2D sections; this pane integrates with Building Blocks for full 3D manipulation
  • Socket utilities permit models to be coupled to another instance of FLAC3D or 3DEC (requires 3DEC license) and to third-party software
  • PFC3D 6.0 is now available as a module, permitting Distinct Element Method (DEM) objects (balls, clumps, and walls) to be used directly within the FLAC3D framework (requires PFC3D license)
  • Every event that modifies the model state is recorded; allowing for undo, playback, or reuse of any or all previous modeling work


  • Multi-core processing (mechanical calculations)
  • Multi-core processing (FISH, fluid-flow, attach-logic, and thermal-option) NEW
  • Optimized solution algorithms (structural element calculations 10% faster NEW and constitutive model calculations, on average, are 70% faster NEW)
  • Customize efficient material constitutive behaviors (requires C++ Plug-in option)
  • Customize fast library functions (DLL) that can be loaded and run as needed (requires C++ Plug-in option)


  • Tested and validated against analytical solutions
  • Sold commercially for over 25 years (since 1994)
  • Used by Itasca’s own consultant engineers and scientists on civil, mining, and energy projects
  • Large repository of examples and validations, with 1000’s of published articles and conference papers
  • Thousands of licenses used worldwide by industry, universities, and government agencies


  • Realistic physical solutions
  • Natural evolution of failure
  • Transparent methodology with all equations and algorithms fully documented
  • Built-in constitutive models are open-source; no black boxes
  • Live, person-to-person software support provided by experienced engineers and software developers
  • Extensive manuals and documentation
  • Automated software update notification in the event of any bug fixes


  • General by design
  • Access to almost all internal variables via the embedded FISH scripting and Python languages
  • CAD interoperability (import DXF and STL geometry)
  • Import ABAQUS and ANSYS meshes
  • Import and export data using I/O functions and from tables and charts directly as CSV files
  • Users may create and run their own constitutive models using FISH scripting or the optional C++ Plug-in
  • The standard version is portable between users and computers
  • A multiple seat network version also is available
  • Licenses are available in-perpetuity or as a monthly or annual lease
  • Options may also be leased


  • No CPU limits or additional CPU fees
  • No annual maintenance fee
  • Coupled or uncoupled steady-state and transient fluid flow is included
  • 21 constitutive models, including Hoek-Brown, Plastic Hardening, NorSand, and P2PSand are available for no additional fees
  • Free standard technical support and software updates (see EULA)
  • Discounted pricing for qualified academic institutions
  • Two instances of FLAC3D can be run on a single computer with the standard version
  • The standard version is secured using a USB key which is portable between users and computers
  • Network licenses are available to share within an organization
  • Advance purchase of the next version (pre-purchase) at a discount is available at all times

Latest News
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Upcoming Events
26 Aug
Deep Foundations Institute S3: Slopes, Slides and Stabilization
The conference focuses on effective application of deep foundations, ground improvement, and soil mixing for stabilization of slopes an... Read More
30 Aug
ACG Caving 2022
The Block and Sublevel Caving Conferences provide a platform for mining companies to be kept informed of the latest technological devel... Read More
30 Aug
16th International conference of International Association for Computer Methods and Advances in Geomechanics (IACMAG). ... Read More