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Washington, DC 20590
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ACTT Workshop: New Jersey
November 16-18, 2004, Cherry Hill, New Jersey

Appendix C (continued): Skill Set Reporting Forms

Geotechnical Skill Set

Idea (Short Name) Idea (Detailed Description) Implementation Details (Barriers, Skill Set Coordination, etc.)
 
  • Clearly the best way to significantly reduce the impact to existing traffic.
  • Reduce the impact to existing traffic.
1. Depressed roadway and urban decks.
  • Urban decks will allow roadway to be used for public purposes safely (near ball fields and cemetery).
  • Reduce noise (improve existing conditions).
Locations:
  • Safety.
  • Greater cost.
I-295 Ramp C
  • Girders/construction over/near travel lanes.
  • Construction workers and equipment in and near travel lanes.
  • Reduce noise (improve existing conditions).
  • Environmental potential if contaminated soils encountered -cost increase.
  • Length limitations.
  • Hazmat issues.
  • Security issues.
  • Maintenance issues.
  • Groundwater/drainage issues.
  • Tradeoff for use of lightweight fills of structure to buy time.
2. Embankments.
  • For underlying weak and compressible clay deposits, embankment fills may require staged construction.
  • To avoid this, single stage fills might incorporate lightweight fills or column supported embankments.
  • Embankment heights should be kept to a minimum. Some embankments may be converted to structures.
  • Use of slightly contaminated soils as embankment fill-DEP approval.
  • ROW
3. Advanced Contracts.
  • Initiate advanced contracts for critical path items to facilitate construction schedule. These might include:
    • Utilities
    • Ground improvement
    • Foundations
    • Structures to facilitate MOT.
  • Permits
  • Coordination
4. Deep foundation.
  • High-capacity driven pipe piles-200 ton
  • Driving fewer piles.
  • Smaller cap.
  • Less noise/vibration.
  • No spoils (speed issue).
  • Testing is simple and fast.
  • Where vibration is an issue:
    • Use bored piles.
    • Micropiles.
    • Drilled shaft (caisson).
    • Methods that require excavation-contaminated soil issues.
5. Existing foundation conflicts.
  • Primarily existing timber piles of short length can be removed easily.
 
6. Cross discipline.  
  • MOT.
  • Access/laydown areas!!
  • Materials-steel/cement.
  • Utilities.
  • Safety.
  • Contracting mechanism-design-build or break into contracts, incentives/disincentives can be helpful.
  • Contaminated soils.
7. Impact of construction on existing structures.
  • Installation of foundations, embankments, tunnel, and retaining walls can affect the performance of existing structures due to vertical and lateral movements and vibrations.
  • Real-time instrumentation can assist in identifying and evaluating situations before significant damage occurs.
8. Design phase full scale tests.
  • Reduce contractor's risk-lower prices.
  • Ensure constructability of method, means, and technology. Reduce claims and delays.
  • Reduce costs through lower factors of safety.
  • Test embankment.
  • Test piles.
  • Pilot tunnel.
  • Need to do early enough in project.
9. Earth retention systems.
  • Wherever possible use:
  • MSE.
  • Soil nailing.
  • Tie backs.
  • FHWA GEC #2-Earth retaining structures.
  • Limited ROW locations, such as Fir Place.
  • Secant pile system.
  • Fir Place: Evaluated and determined to consist of only approximately 150 ft of limited ROW and wall height max of15 ft. If tie backs are not acceptable to homeowner, secant pile system will provide robust wall with reduced lateral movements-used for railroads and subways for minimum lateral movements.
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Updated: 10/31/2013
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000