Basic introduction to Flac3D
Flac3D software is an analysis tool for solving three-dimensional geotechnical engineering problems. The explicit Lagrangian format and mixed discrete partitioning technology are used to ensure the accuracy of the plastic damage and flow model. Extensive drawing options and simple, automatic movie pre-processing tools. In a 3D mesh, materials are represented by polyhedral elements that the user can adjust to the shape of the modeled object. FLAC3D basically inherits the calculation principles of the FLAC program and extends the analysis capabilities to three-dimensional space. The most important is the command driver, which increases the flexibility of the scripting language fish. The ability to access a program's command structure and manipulate it using FISH is at the core of Flac3d's modeling capabilities. On the premise that the node motion is known and the element strain state information is further obtained, the mechanical and deformation characteristics of individual elements in the grid group model obey the mature numerical model. Use explicit solutions. Therefore, the explicit solution solves the nonlinear stress-strain relationship almost simultaneously with the linear constitutive relation, while the implicit solution takes a long time to solve the nonlinear problem.
Flac3D constitutive model
1. Empty unit model (excavation model);
2. Three elastic models (isotropic properties, orthotropic properties and transverse anisotropic properties);
3. Seven plasticity models (Drucker-Prager model, Mohr-Coulomb model, strain hardening/softening model, multi-joint model, bilinear strain hardening/softening multi-joint model, D-Y model and modified Cambridge model);
Flac3D mesh generation
Each area in the Flac3D software mesh can be given a different material model, and also allows the statistical distribution and variation gradient of the material parameters to be specified. Moreover, it also includes joint elements, also called interface elements, which can simulate the discontinuous characteristics of different material properties at the interface of two or more materials. Joints allow sliding or separation to occur and can therefore be used to model faults, joints or frictional boundaries in rock masses.
The grid generator gen in the Flac3D software can easily generate the required three-dimensional structural grid by matching and connecting the local grid generated by the grid generator. It can also automatically generate cross-structured grids (such as intersecting lanes). The three-dimensional grid is determined by the overall coordinate system x, y, and z system, which is different from the FLAC program which is determined by rows and columns. This provides a more flexible way to generate and define three-dimensional space parameters.
Flac3D software features
1. Faster running speed:
Flac3D software calculates faster, draws faster, and processes commands faster. Tests show that in these areas, software processing speed will increase from two to one hundred times.
2. Brand-new graphical user interface:
The user interface of FLAC3D has been completely redesigned. Users will have a brand-new experience, which is faster, more efficient, easier to use, and loaded with many new features.
3. Accelerated 3D graphics engine:
3D accelerated graphics processing has been added, the graphics rendering speed has been greatly improved, and a series of new model visualization options are provided, including transparency settings, interactive clipping, isosurfaces, DXF graphics, and more.
4. Built-in text editing function:
With text editing tools built into the program for project management, FLAC3D can be used for standalone text editing or run with your favorite third-party tools. Open data files can be run directly in the user interface.
Flac3D calculation steps
Unlike most programs that use data input, FLAC uses a command-driven approach. Command words control the execution of the program. When necessary, especially for drawing, the FLAc user interactive graphical interface can also be launched. In order to establish the FLAC calculation model, the following three aspects of work must be carried out:
1. Finite difference grid
2. Constitutive properties and material properties
3. Boundary conditions and initial conditions
After completing the above work, the initial equilibrium state of the model can be obtained, which is the stress state of the original rock before simulating excavation. Then, perform engineering excavation or change boundary conditions to perform engineering response analysis, similar to FLAC's explicit finite difference program problem solving. Unlike traditional implicit solvers, FLAC uses an explicit time step to solve algebraic equations. The solution to the problem is reached after a series of computational steps.
In FLAC, the computational steps required to reach the problem can be controlled by the program or the user, but the user must determine whether the computational steps have reached the final solution of the problem.
Flac3D update log
1. Fix bugs in the previous version
2. Optimize some functions
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