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CE 496 Senior Design

CE 496 Senior Design. Geotechnical Engineering: Soil Properties & Testing Lecture 4 Date: 1/19/2012 Professor Knur. Looking Ahead. Next Three Lectures: Define Project Objectives and Needs Inventory of Geotechnical Data Sampling/Field Procedures Lab Testing Procedures Analyses.

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CE 496 Senior Design

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  1. CE 496 Senior Design Geotechnical Engineering: Soil Properties & Testing Lecture 4 Date: 1/19/2012 Professor Knur

  2. Looking Ahead • Next Three Lectures: • Define Project Objectives and Needs • Inventory of Geotechnical Data • Sampling/Field Procedures • Lab Testing Procedures • Analyses

  3. A. Project Objectives and Needs • Describe Levee Composition • Levee Seepage Properties • Stability of Levee slopes for several conditions • Capacity of Levee to support new structures • Specifications for Levee redesign

  4. A.Project Objectives and Needs • Describe Levee Composition • Lateral and vertical distribution of soil types • Lateral and vertical distribution of soil properties • Levee construction methodology

  5. A. Project Objectives and Needs 2.Levee Seepage Properties • How much/why is water leaking out of Levee? • Use analysis tools from previous lecture (Flow Nets, SEEP/W program) • Need Test Data and Levee geometry

  6. A. Project Objectives and Needs 3. Stability of Levee Slopes • What inclination can slopes safely handle? • Use spreadsheet or GSTABL Program

  7. A. Project Objectives and Needs 4. Capacity of Levee to support new Structures • Needed if we recommend new gates, pumps, etc. • Use spreadsheets

  8. A. Project Objectives and Needs 5. Specs. for Levee Repair or Design • Compaction Characteristics • Soil types or zoning • Slope inclination • Above based on test data and analysis

  9. B.Inventory of Geotechnical Data • Borings B211 through B218

  10. Boring Locations • Borings B211 through 218

  11. Boring Locations

  12. Boring Logs

  13. Lab Data (M and D)

  14. Lab Data (Modified Proctor)

  15. Lab Data (Direct Shear)

  16. B. Section Summary • We have large amount of Soil Data that needs to be summarized numerically and spacially • Where is the fundamental gap in the data? • What can we do about it?

  17. C.Soil Sampling/Field Procedures • Hand Sampling • Cheap, portable, simple • Shallow depths, soft soils only, limited sampling methods • Drilling Rigs • Powerful, depths to 100’+, multiple sample methods possible • Expensive, cumbersome

  18. Soil Sampling • Hand Augering and Sampling

  19. Soil Sampling 2.Hollowstem Auger Drilling

  20. Soil Sampling 2.Hollowstem Auger Sampling

  21. Boring Log Information

  22. Field Testing 3. Double Ring Infiltrometer

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