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FLAC3D is a numerical modeling code for advanced geotechnical analysis of soil, rock, and structural support in three dimensions.

FLAC3D is a continuum code that is used in analysis, testing, and design by geotechnical, civil, and mining engineers. FLAC3D has a large range of application because its analytical potential is not limited to a particular problem definition or type of analysis. FLAC3D is designed to accommodate any kind of geo-technical engineering project where continuum analysis is necessary.

FLAC3D is an accurate and efficient geotechnical analysis tool that utilizes an explicit finite difference formulation. FLAC3D can model a number of complex behaviors not readily suited to FEM codes, such as: problems that consist of several stages, large displacements and strains, non-linear material behavior and unstable systems (even cases of yield/failure over large areas, or total collapse).

FLAC3D operates under all Windows platforms, with command mode operation available in a standard output window. FLAC3D provides built-in primitive shapes and rapid, high resolution graphics capabilities to expedite the modeling process. Solution parameters may be specified by the user, maximizing the userís control over the duration, length, and efficiency of the model run. Additional control and customization are available to the user through FLAC3D's powerful built-in programming language, FISH.

FLAC3D has been available for over seven years, used by engineers, consultants, and in university teaching and research. FLAC3D is currently licensed to more than 500 users in over 42 countries - making it one of the most widely used three-dimensional numerical modeling tools for geotechnical analysis in the world.

  • Dynamic Analysis. With this option, the full dynamic response of a system may be modeled in the time domain. Capabilities added to the standard features of FLAC3D include: specification of acceleration-, velocity-, or stress-wave input; quiet boundaries; free-field conditions; damping; liquefaction modeling; and full dynamic structural formulation. In addition, the dynamic option may be used in conjunction with the groundwater flow model for fully coupled analyses. The dynamic option is formulated using a nonlinear law and a proper plasticity formulation - providing an accurate view of the dynamic system by allowing natural description of materials, frequencies, displacements, and damage.
  • Thermal Analysis. The Thermal Option allows modeling of the transient flux of heat in materials and the subsequent development of thermally induced stresses. A model using this option may be run independently or coupled to the mechanical stress calculation or pore pressure calculation, either in static or dynamic mode.
  • Creep Analysis. Eight additional material models that simulate viscoelastic and viscoplastic (creep) behavior make up the Creep Option: the classical viscoelastic (Maxwell) model; a Burgerís substance viscoelastic model; a two-component power law; a reference creep formulation (the WIPP model) implemented for nuclear waste isolation studies; a Burger-creep viscoplastic model; a WIPP-creep viscoplastic model; a power-law viscoplastic model; and a crushed-salt constitutive model. WIPP-creep viscoplastic model; a power-law viscoplastic model; and a crushed-salt constitutive model. A FLAC3D grid can be configured for both a creep calculation and a dynamic calculation. However, both modes cannot be active simultaneously because of the widely different timesteps. The creep and dynamic calculations are toggled during a dynamic/creep analysis.
  • User Defined Constitutive Models. User-defined constitutive models can now be written in C++ and compiled as DLL (dynamic link library) files that can be loaded whenever needed in a FLAC3D simulation. C++ DLL models run at the same speed as built-in models. A Visual C++ Version 6.0 compiler is used to compile the DLL files. Source files for all FLAC3D C++ models are provided to users; the same DLLs are also used by FLAC and upcoming versions of 3DEC and UDEC. Thus, a single user-defined model can be utilized by several Itasca codes.
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