Bob Scavuzzo, P.E. bscavuzzo@ctcgeotek.com Geotechnical Consultant - - PowerPoint PPT Presentation

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Bob Scavuzzo, P.E. bscavuzzo@ctcgeotek.com Geotechnical Consultant - - PowerPoint PPT Presentation

Aug 25, 2022 34 likes •275 views

IBS Building IBS Building Geotechnical Investigation Considerations Geotechnical Investigation Considerations Bob Scavuzzo, P.E. bscavuzzo@ctcgeotek.com Geotechnical Consultant Geotechnical Consultant Audience/Role: Owner/Developer

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IBS Building IBS Building Geotechnical Investigation Considerations Geotechnical Investigation Considerations

Bob Scavuzzo, P.E. bscavuzzo@ctcgeotek.com

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Geotechnical Consultant Geotechnical Consultant

Audience/Role:

  • Owner/Developer
  • Structural Engineer
  • Civil Engineer
  • Architect
  • Contractor
  • Peers
  • Lawyers
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SLIDE 3

Considerations Considerations

  • How Many Holes to Drill?
  • Building Size
  • Location
  • Rule of Thumb/Standard of Care:
  • 100 foot spacing of borings
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IBS Building Site Plan IBS Building Site Plan

  • 4 Story

Building

  • Partial

Basement

  • Footprint:

160 ft x 65 ft

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How Deep? How Deep?

  • Anticipated Foundation System
  • Piers, Footings, P-T Slab
  • Depth to Bedrock
  • Column Loads:
  • DL: 450 kips Max: 900 kips
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Previous CU Campus Investigations Previous CU Campus Investigations

Future IBS Building

Earth Sciences Building Bdrx @ 17-34 ft Overburden: sand, clay, silt GW @ 12 ft Folsom Field Expansion Bdrx @ 8-24 ft Overburden: sand, clay, silt GW @ 9-19 ft CU Buffs Practice Bubble Bdrx @ 20 ft Overburden: sands & gravel GW @ 10 ft

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Drilling and Sampling Drilling and Sampling

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Drilling and Sampling Drilling and Sampling

  • Sampling Frequency:

– 2, 4, 9, (3 samples in top 10 feet) – 5 feet intervals thereafter

  • 140 lb hammer falling 30 inches (ASTM D1586)
  • Number of hammer blows to drive sampler 1 foot or

fraction

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Boring Logs Boring Logs

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Laboratory Testing Laboratory Testing

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Laboratory Testing Laboratory Testing

Swell/Consolidation Swell/Consolidation Results Results

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Laboratory Testing Laboratory Testing

Water Soluble Sulfates Water Soluble Sulfates ACI Specifications ACI Specifications

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Foundation Recommendations Foundation Recommendations

  • Drilled Piers

– 18 foot minimum length – 6 foot minimum bedrock penetration

  • Ensure pier bottom is in zone of stable

moisture content

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Pier Design Values Pier Design Values

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Pier Design Values Pier Design Values

  • Minimum Pier Diameter
  • L/D Ratio
  • Design Pressure Reductions (Group

Action)

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L L-

  • Pile Parameters

Pile Parameters

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Seismic Survey Seismic Survey

2006 IBC 2006 IBC

(2004 Denver Amendment) (2004 Denver Amendment)

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Seismic Survey Seismic Survey

Test Schematic

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Seismic Survey Seismic Survey

100 foot long lines, 100 foot deep analysis

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Seismic Survey Seismic Survey

Field Investigation

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Seismic Survey Seismic Survey

  • Survey DATA
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Lateral Earth Pressure Lateral Earth Pressure

  • Foundation Walls
  • Retaining Walls
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Structural Plan Specifications Structural Plan Specifications

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Concluding Remarks Concluding Remarks

QUESTIONS? QUESTIONS?