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INTRODUCTION TO NUMERICAL MODELING IN GEOTECHNICAL ENGINEERING WITH EMPHASIS ON FLAC MODELING

By Siavash Zamiran, Ph.D., P.E. Geotechnical Engineer, Marino Engineering Associates, Inc. Adjunct Faculty, St. Louis University Los Angeles, CA January 2019. INTRODUCTION TO NUMERICAL MODELING IN GEOTECHNICAL ENGINEERING WITH EMPHASIS ON FLAC MODELING. www.zamiran.net. Outline.

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INTRODUCTION TO NUMERICAL MODELING IN GEOTECHNICAL ENGINEERING WITH EMPHASIS ON FLAC MODELING

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  1. By Siavash Zamiran, Ph.D., P.E. Geotechnical Engineer, Marino Engineering Associates, Inc. Adjunct Faculty, St. Louis University Los Angeles, CA January 2019 INTRODUCTION TO NUMERICAL MODELING IN GEOTECHNICAL ENGINEERING WITH EMPHASIS ON FLAC MODELING www.zamiran.net

  2. Outline • Introduction to the short course • Introduction to computational geotechnics • Commercial geotechnical programs • Theoretical considerations • Numerical modeling in FLAC and FLAC3D • Practical application: Shallow foundations • Practical application: Retaining wall systems • Practical application: Tunnel modeling • Earthquake modeling using fully dynamic analysis

  3. Shallow Foundations • Modeling and analysis of a simple shallow foundation loading • Using group zoning to define layers and regions • Simplified stone column modeling

  4. Retaining Wall Systems Examples: • Modeling a cantilever retaining wall using structural element • Modeling a gravity retaining wall using grid zones • Modeling a retaining system using nailing and anchoring Lectures: • FLAC interface model • Structural elements in FLAC

  5. Outline • Introduction to the short course • Introduction to computational geotechnics • Commercial geotechnical programs • Theoretical considerations • Numerical modeling in FLAC and FLAC3D • Practical application: Shallow foundations • Practical application: Retaining wall systems • Practical application: Tunnel modeling • Earthquake modeling using fully dynamic analysis

  6. Siavash Zamiran Graduated from Southern Illinois University Carbondale Civil Engineering, Geotechnical Dissertation: Earthquake Analysis of Retaining Walls

  7. Adjunct Faculty at St. Louis University

  8. Adjunct Faculty at Southern Illinois University Edwardsville

  9. Geotechnical Engineer at Marino Engineering Associates, Inc. www.meacorporation.com

  10. Services

  11. Outline • Introduction to the short course • Introduction to computational geotechnics • Commercial geotechnical programs • Theoretical considerations • Numerical modeling in FLAC and FLAC3D • Practical application: Shallow foundations • Practical application: Retaining wall systems • Practical application: Tunnel modeling • Earthquake modeling using fully dynamic analysis

  12. Numerical Modeling Procedure

  13. Simple Definition of Modeling

  14. Application of Computational Geomechanics • Interpretation • Design • Prediction

  15. Numerical Modeling Steps • Selection of representative cross-section • Idealize the field conditions into a design X-section • Plane strain vs. axisymmetrical models • Choice of numerical method and program • Defining the geometry • Assign constitutive model e.g. elastic, Mohr-Coulomb, etc. • Assign material properties • Generate grid/mesh for the domain • Assign boundary/loading conditions • Solve for initial condition • Problem alterations • Run the model • Obtain results • Interpret of results

  16. Numerical Modeling Flowchart

  17. Idealize Field Conditions to Numerical Modeling • 3D modeling • 2D modeling • Plain strain • No strain in the z direction • Structure or feature is relatively long • Axi-symmetry

  18. Plan Strain vs. Axi-symmetry

  19. Plain Strain Numerical Modeling Examples Deformation analysis of slopes Deformation analysis of tunnels

  20. Outline • Introduction to the short course • Introduction to computational geotechnics • Commercial geotechnical programs • Theoretical considerations • Numerical modeling in FLAC and FLAC3D • Practical application: Shallow foundations • Practical application: Retaining wall systems • Practical application: Tunnel modeling • Earthquake modeling using fully dynamic analysis

  21. Commercial Geotechnical Programs • Programs Developed by Itasca, Inc. • Programs Developed by Plaxis • Programs Developed by Geo-Slope International Ltd. • Programs Developed by Rocscience • Programs Developed by Midas Technology, Inc. • Geo5 Package

  22. Programs Developed by Itasca, Inc.

  23. Itasca Consulting Group, Inc. • Engineering consulting and software firm • Based on Minneapolis, MN • Areas of concentration: mining, civil engineering, oil & gas, manufacturing and power generation • Since 1981 • Products: • FLAC • FLAC3D • FLAC/ Slope • PFC • 3DEC • UDEC • XSITE

  24. Modeling Tools- Itasca CG • FLAC • FLAC3D • UDEC • 3DEC • PFC > Command keyword coding

  25. Download a Demo Version of Itasca Product

  26.  Demonstration Software

  27.  Demonstration Software

  28. FLAC/FLAC3D • Large-strain simulation of continua • Groundwater flow, with full coupling to mechanical calculation • Structural elements • thermal and creep calculations • dynamic analysis • two-phase fluid flow model • user-defined constitutive models written in C++ • Built-in language (FISH) to add user-defined features (e.g., new constitutive models, new variables or new commands)

  29. FLAC

  30. FLAC3D

  31. UDEC/3DEC • Stability analysis of jointed rock medium • Deep underground excavations • Blasting effects • Ground support reinforcement • Underground construction • Fluid-pressurized tunnels • Dams and dam foundations • Fluid flow though jointed rock (hydraulic fracturing) • Earthquake engineering

  32. UDEC

  33. UDEC- Dams and Dam Foundations

  34. UDEC/3DEC- Tunnels

  35. PFC2D/3D • Particle Flow Code • Thermal-mechanical coupling • Add new physics using C++ • Available fluid dynamics add-on

  36. XSite: Hydraulic Fracture Simulation

  37. Programs Developed by Plaxis

  38. Plaxis • Finite element method • 2-Dimensional and 3-Dimensional analysis  • Groundwater flow • Heat flow • Dynamic analysis • Based on Delft, The Netherlands • Products: • Plaxis2D • Plaxis 3D • 3D Plaxiflow • 2DPlaxflow

  39. Plaxis2D

  40. Plaxis2D

  41. Plaxis3D

  42. Programs Developed by GEO-SLOPE International Ltd.

  43. Geo-Slope Products • SLOPE/W for slope stability • SEEP/W for groundwater seepage • SIGMA/W for stress-deformation • QUAKE/W for dynamic earthquake • TEMP/W for geothermal • CTRAN/W for contaminant transport • AIR/W for air flow • Based on Alberta, Canada • 2-Dimensional program

  44. Slope/W

  45. Sigma/W

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