FLAC3D Modeling • Problem Solving with FLAC3D
Problem Solving with FLAC
This section provides guidance in the use of FLAC3D in problem solving for static mechanical analysis.[1] It does so by breaking the modeling process down to a sequence from project start to project completion, as follows.
Each of these modeling aspects is discussed in detail. The user who is familiar with the two-dimensional program FLAC will find that the modeling approach is very similar in FLAC3D. The major difference is the procedure for grid generation. We recommend that Grid Generation be studied carefully, and that the user grasps the techniques for grid generation presented there before creating their own model grids.
Note that FISH programs are used in this section to assist with model generation and problem solving. If new to the FISH language, it is advisable to first read FISH Tutorial.
The philosophy of modeling in the field of geomechanics was presented earlier in the topics discussed in the section Modeling Methodology. The novice modeler may wish to review that section first. The methodology of modeling in geomechanics can be significantly different from that of other engineering fields, such as structural engineering. It is important to keep this in mind when performing any geomechanics analysis.
Section Outline
- Approach and Project Setup
- Grid Generation in FLAC3D
- Identifying Regions of the Model
- Working with Geometric Data
- Choice of Constitutive Model
- Material Properties
- Boundary Conditions
- Initial Conditions
- Uniform Stresses — No Gravity
- Stresses with Gradients — Uniform Material
- Stresses with Gradients — Nonuniform Material
- Stress Initialization in a Nonuniform Material
- Compaction within a Nonuniform Grid
- Initial Stresses following a Model Change
- Stress and Pore-Pressure Initialization with a Phreatic Surface
- Initialization of Velocities
- Reaching Equilibrium
- Loading and Sequential Modeling in FLAC3D
- Structural Support
- Interfaces
- Tips and Advice
- 1. Check Model Runtime
- 2. Effects on Runtime
- 3. Considerations for Zoning Density
- 4. Automatic Detection of an Equilibrium State
- 5. Considerations for Selecting Damping
- 6. Check Model Response
- 7. Initializing Variables
- 8. Minimizing Transient Effects on Static Analysis
- 9. Changing Material Models
- 10. Running Problems with In-Situ Field Stresses and Gravity
- 11. Determining Collapse Loads
- 12. Determining Factor of Safety
- 13. Use Bulk and Shear Moduli
- FLAC3D Runtime Benchmark
- Interpretation
- Project Completion
- References
Endnotes
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