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Geotechnical Investigation. Step 1 - Gather Existing Information Structure Data Bridge, building, road, wall, etc. Type - stories, loads, materials, etc Known Soil Data Your own knowledge of the area Geologic or other maps Other people Aerial photos. Geotechnical Investigation.

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Presentation Transcript
slide1

Geotechnical Investigation

  • Step 1 - Gather Existing Information
      • Structure Data
          • Bridge, building, road, wall, etc.
          • Type - stories, loads, materials, etc
      • Known Soil Data
          • Your own knowledge of the area
          • Geologic or other maps
          • Other people
          • Aerial photos
slide2

Geotechnical Investigation

  • Step 2 - Field Investigation
      • Site Recon -Before you move any equipment to site, visit the site
      • A visual inspection can tell you a lot:
          • Site access
          • existing structures
          • evidence of old structures
          • environmental hazards
          • non-engineered fill
          • sinkholes
          • topography
          • condition of nearby structures
slide3

Geotechnical Investigation

  • Step 2 - Field Investigation - cont’d
      • Subsurface Investigation
        • Test Pits - holes dug with a backhoe
        • Borings
          • Solid Flight
          • Hollow Stem
          • Rotary Wash
slide4

Geotechnical Investigation

  • Step 2 - Field Investigation - cont’d
    • Borings used to obtain samples at various depths
    • Samples needed depend on project
    • Most common method of sampling is the
      • Standard Penetration Test - SPT
      • Recall SPT is 140 lb hammer dropped 30”
slide5

Geotechnical Investigation

  • Borings - cont’d
    • Drill rig – Hollow Stem Auger - SPT
slide6

Geotechnical Investigation

  • Borings - cont’d
    • Drill rig – Hollow Stem Auger - SPT
slide7

Geotechnical Investigation

  • Borings - cont’d
    • Drill rig – Hollow Stem Auger - SPT
slide8

Geotechnical Investigation

  • Borings – cont’d
    • # of borings project dependent
    • For a building, will typically start with corners and in the middle
    • Based on what is found, more borings can be drilled as needed to define areas of concern or to obtain additional data
slide9

Geotechnical Investigation

  • Borings – cont’d
    • Layout depends on footprint too
    • Depth depends on anticipated soil conditions and foundation type
    • We want to be sure we sample all soil potentially influenced by the foundation system
slide10

Geotechnical Investigation

  • Borings – What are we looking for?
    • Soil classification
    • Soft compressible soils
    • Competent foundation soils
    • Bedrock
    • Ground water
    • Any other subsurface that could affect the project
slide11

Geotechnical Investigation

  • Step 3 – Laboratory Investigation
    • Most common tests include:
      • Plasticity (atterbergs)
      • Sieve
      • Moisture
      • Unit Weight
      • Proctor
      • Strength tests (unconfined, direct shear, etc.)
slide12

Geotechnical Investigation

  • Step 4 – Design
    • The design process will take into account all data
    • Consider loads, soils, type and use of facility, etc.
    • GE often asks “what is needed” vs. what is calculated
slide13

Geotechnical Investigation

  • Step 4 – Design – cont’d
    • Some of the main items conveyed to client:
      • Types of soils
      • Groundwater
      • Recommended foundation type or options plus design and construction criteria
      • Depth to bedrock
      • Excavatability
      • Soil compaction criteria
      • Slope recommendations
      • Retaining wall design
      • Boring and Lab test results