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Continuum Modeling for Geomechanics in 2D

Choose FLAC2D for advanced geotechnical problem solving. Ideal for 2D soil, rock, concrete analysis, structural ground support, and groundwater flow. Optimize solutions now and check out the latest version, FLAC2D 9.2!

What's new in the latest release of FLAC2D?

New Machine Learning Based Tools
The V9.2 machine learning toolset, powered by ITASCA’s groundbreaking research, revolutionizes geotechnical analysis! Developed using vast datasets and advanced algorithms, these tools rapidly identify patterns in complex conditions for highly accurate predictions. The first tool, the new Hoek-Brown rock slope model, instantly calculates the factor of safety, delivering precise results with customizable inputs in seconds!
New Constitutive Model Curved Mohr-Coulomb
The traditional Mohr-Coulomb model oversimplifies failure, risking safety overestimation in low-stress zones like shallow slips. ITASCA’s new Curved Mohr-Coulomb model changes everything! It’s efficient, flexible, and features a nonlinear failure envelope with just three parameters or custom curves. Plus, it supports linear, bilinear, Hoek-Brown, and Griffith laws—ideal for automatic factor of safety calculations!
New Joint-Set Logic
The new FLAC2D and FLAC3D Sketch update introduces a UDEC-like capability for modeling joints through rock. Easily generate and preview up to three joint-sets with customizable orientations, spacing, trace lengths, and other properties. Sketch can mesh around these joints, automatically assigning them to groups based on their names. Individual joints can also be manually specified using the Joint-Set slot. This enhanced functionality simplifies the modeling process and provides greater flexibility in representing complex geological structures.

SOLUTIONS FOR VARIOUS GEOTECHNICAL CHALLENGES

What Kinds Of Problems Can FLAC2D Solve?

A wharf built into a slope is composed of beam and pile structural elements. Max shear strain incremental contours and horizontal displacement of wharf are shown after being subjected to an earthquake.

Concrete diaphragm wall model showing horizontal displacement contours, total displacement vectors, bending moments and horizontal displacement along liner, plus bending moment in support struts.

Elliptical supported tunnel developed in a series of excavation and support sequences.

Automatic factor of safety contours for a mine slope.

Top: Mine tailings dam constructed in stages. Bottom: Max shear strain increments after an earthquake.

Post-peak strength behavior of a mine pillar without surrounding backfill.

WHY YOU'LL LOVE IT

Why Choose FLAC2D?

Explore FLAC2D's comprehensive features and user-friendly interface. Unlock powerful computing capabilities, including the ability to run two instances simultaneously. Discover why FLAC2D is the ideal choice:
  • Plane strain

  • Axisymmetric (mechanical)

  • Small-strain mechanics (gridpoints remain fixed)

  • Large-strain mechanics (gridpoints move with displacement)

  • Effective stress (pore pressure)

  • Automatic factor of safety

  • Back-analyze failure and calibrate forward-prediction

  • Multiple, simultaneous failure mechanisms

  • Zone relaxation for gradual excavation and construction sequencing and out-of-plane closure

  • Groundwater flow

  • Service limit state (SLS) and ultimate limit states (ULS) based on displacements

  • Liquefaction

  • Settlement and Consolidation

  • Surface Subsidence

  • Recovery and dilution

  • Coupled ground-structure interaction (beams, cables, piles, shells, geotextiles, liners)

  • Options available: Dynamics (Earthquakes, Blasting, Vibration), Thermal, Creep, User-Defined Constitutive Models (UDM)

  • FLAC2D makes model construction easy with interactive tools in Sketch to create the model or import CAD files, automatic meshing, and intuitive boundary skinning. Easily define groups in the Model pane and assign constitutive models and material properties using the built-in user database. Automatic stress initialization based on model topography and user settings greatly simplifies the modeling workflow. A wizard is available to convert FLAC 8.1 grids into a FLAC2D mesh.

  • FLAC2D utilizes multi-threading and optimized solutions for fast, responsive, and accurate simulations. Maxwell damping for dynamic simulations and enhanced solvers for fluid flow and thermal simulations enable efficient solution times.

    Multi-threaded FISH and Python libraries provide extremely efficient model scripting when user customization is chosen. FLAC2D plane-strain or axisymmetric models run up to 5x faster than equivalent 3D models. Users may also run two instances of FLAC2D on the same computer simultaneously, cutting down on overall time to solution for multiple models

  • FLAC2D offers robust simulation capabilities, including large-strain simulation to visualize the full extent of model deformation; 20 built-in constitutive models for soil, rock, concrete, and metal; dynamics analysis to simulate earthquakes and liquefaction; and structural elements to design ground support.

    Advanced plotting tools, FISH scripting, and Python integration provide unparalleled model control and customization, while statistical tools and data import options expand modeling possibilities.

  • Enjoy flexibility in modeling and your workspace with FLAC2D’s highly adaptable tiled user interface that allow users to layout the program as preferred, work with hundreds of plots efficiently, and build, construct, and modify the modeling workflow as needed.

    Use FISH and/or Python scripting for model parameterization, custom visualizations, adding new physics, and/or model run control. Use one of the 20 built-in constitutive models for material behavior or develop a custom user-defined constitutive model (UDM).

  • In conjunction with interactive tools, FLAC2D uses commands to provide a compact representation of the model (as a data file) for repeatability, to ensure path dependency (excavation sequence and any other sequence of events, such as boundary conditions or material properties), and for flexibility.

    Intuitively structured commands, built-in contextual help, and command auto-completion help users learn and work with commands. Most user interface interactions are automatically translated into commands so you can see how they are composed and reuse them. The built-in text editor adds efficiency to creating and running models with commands.

  • New Machine Learning Based Tools

    Developed using vast datasets and advanced algorithms, these tools rapidly identify patterns in complex conditions for highly accurate predictions. The first tool, the new Hoek-Brown rock slope model, instantly calculates the factor of safety, delivering precise results with customizable inputs in seconds!

    LEARN MORE

  • New Constitutive Model Curved Mohr-Coulomb

    The new Curved Mohr-Coulomb model offers efficiency and flexibility with a nonlinear failure envelope using three parameters or custom curves, supporting linear, bilinear, Hoek-Brown, and Griffith laws—perfect for automatic factor of safety calculations.

    LEARN MORE

  • New Joint-Set Logic

    The latest update to FLAC2D and FLAC3D sketch incorporates a UDEC capability of modeling joints through rock. Users can assign custom group slots and utilize the new Joint-Set logic and dialog, complete with a preview feature for more efficient joint-set generation.

    LEARN MORE

  • New Constitutive Model Synthetic Microseismicity

    Now calculate accumulated plastic strain tensors to extract synthetic seismic magnitudes and moment tensors!

    LEARN MORE

  • And More!
    • New Scripting, ZONE FIELD DATA
    • New AI Assistant, ask product questions and receive expert answers including suggested scripts
    • Performance Enhancement, RESTORE and NEW data files +3X faster

  • Improved Fluid Flow and Thermal Analyses

    The mechanical-fluid and mechanical-thermal commands and workflow have been significantly simplified, improving the usability and learnability of fluid flow analyses.

    LEARN MORE

  • Improved Multi-Process Modeling

    Multi-process models contain two or more coupled or decoupled solutions (mechanical/static, fluid, dynamic, thermal, and creep). Significant improvements have been made to simplify multi-process models, making analyses easier to use and understand.

    LEARN MORE

  • Updated Null Logic

    Zones may be nulled to represent removal of material that you may want to backfill later or cycle through glaciation periods (ice/no ice). When a zone is nulled, the model behaves as if the zone has been deleted, but the zone position and shape continue to be tracked for easy reuse later.

    LEARN MORE

  • Better Scripting

    • Python can now access the built-in geometry logic (user-defined nodes, edges, faces, volumes, etc.).
    • The contourpy Python library (for calculating contours of 2D quadrilateral grids) is now built-in.

  • And More!

    • Grouping operations are now faster.
    • New Hoek-Brown curve fitting and plotting tool – then add these value as PROPERTY commands right into your model.
    • QT 6 user interface libraries have been updated:
    – User interface appearance is improved on high-resolution monitors.
    – No need to specify OpenGL Mode.
    • By place an * at the start of a command, all related warning messages will be suppressed.

HEAR FROM THOSE WHO ACHIEVED RESULTS WITH ITASCA SOFTWARE

See What Users Have To Say

"The recent changes and enhancements made to [ITASCA's] FLAC2D & 3D codes cover very well our increasing professional demands in advanced Civil Engineering Applications – well done."
Fulvio Besseghini, Lombardi Engineering Ltd.
“The flexibility FLAC[2D] offers in simulating the geoengineered systems as realistically as possible, and the accessibility to nearly all the FLAC’s functionality through FISH has been a key point that motivated me to use FLAC in my research.”
Girish Kumar, PhD
"The GUI, FISH language, constitutive models, & formulation make FLAC my go-to analysis tool for project & research work."
Richard Armstrong, Geoanalysis Support/ CSU, Sacramento
“FLAC2D software provides me with all the necessary elements to carry [out] successful dynamic analysis.”
Rita Abou Jaoude, PhD
"FLAC2D and FLAC3D have proven to be essential tools in the fields of geomechanics and geotechnical engineering. These two codes represent an absolute benchmark for performing slope stability analyses and for solving soil-structure interaction problems with particular reference to bridges and viaducts."
Walter Salvatore, Consorzio Fabre
"The implementation of finite difference method ensures high-quality results, and the new versions of the codes have been significantly improved with a new user interface while the technical support from ITASCA is absolutely outstanding."
Walter Salvatore, Consorzio Fabre
MORE TO LOVE

Expand Your Software Capabilities With These Options:

Expand your FLAC2D software capabilities with our range of add-on options, designed to tackle diverse engineering challenges effectively. Explore our selection of options to customize your FLAC2D experience.

  • FLAC2D offers two-dimensional, fully dynamic analysis that extends simulation capabilities to a wide range of dynamic problems in earthquake engineering, soil liquefaction, seismology, blasting, and mine rockbursts. You can specify acceleration, velocity, or stress waves as an exterior or interior boundary condition and include wave absorbing and free-field boundary conditions.

    Dynamics supports soil-structure interaction, can be coupled to thermal analysis, and includes a Dynamics Wizard to pre-process ground motions. Couple Dynamics to groundwater flow for analyses involving time-dependent pore pressure change associated with liquefaction. FLAC2D includes several dynamic and liquefaction constitutive models and includes Maxwell damping, resulting in fast dynamic model run times.

    LEARN MORE

  • FLAC2D’s thermal analysis combines conduction and advection models to simulate heat transfer and thermal-induced displacements for modeling geothermal and nuclear waste applications. Thermal provides for one-way coupling to the mechanical stress and pore-pressure calculations. It includes four thermal material models and variable boundary conditions.

    Heat sources may be inserted into the model, which may decay exponentially with time. The Hydration-Drucker-Prager constitutive model is also included, which can adjust the mechanical properties of a material corresponding to the hydration grade (or equivalent concrete age). New solvers are now included in FLAC2D, making thermal model run times incredibly fast.

    LEARN MORE

  • FLAC2D’s creep analysis can be used to simulate the behavior of materials that exhibit time-dependent material behavior. FLAC2D provides 10 constitutive models for simulating creep, which cover both viscoelastic and viscoplastic behavior. You can also modify these models or create new creep constitutive models using C++ for a user-defined constitutive model (UDM). Applications include oil and gas reservoirs, compressed-air energy storage, mining, frozen-soils, nuclear waste disposal, and deep tunnels.

    LEARN MORE

  • FLAC2D’s user-defined constitutive model (UDM) greatly expands the software’s versatility by permitting users to develop their own constitutive models, using C++ scripting, to describe a material behavior that differs from ITASCA’s built-in library. Templates and instructions are provided. Start by modifying one of the built-in constitutive models or create an entirely new material behavior.

    UDMs can be automatically loaded into your FLAC2D project and may be freely distributed (as a DLL file). ITASCA maintains a UDM Library on our website should you want to share your constitutive model. With the UDM, you may also download and run constitutive models from the UDM Library, including PM4 and UBC liquefaction models.

    LEARN MORE

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Software Support

Our commitment extends beyond excellent products. We offer comprehensive support for all your inquiries. Explore the links below to kick-start your journey:

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Licensing & Pricing

FLAC2D
One Month Subscription

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  • Simple payment options

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  • FLAC2D
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  • Convenient web license

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  • FLAC2D
    Perpetual License

  • Convenient web license

  • One-time purchase, lifetime access

  • One year of free technical support


  • FLAC2D
    Academic License

  • Student & Instructor discounts

  • Contact salesperson for information




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