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Geotechnical Engineering

 

Checklist and Guidelines for Review of Geotechnical
Reports and Preliminary Plans and Specifications

PS&E Review Checklist for Specific Features

E. Retaining Structures

  1. *Are select materials specified for wall backfill with gradation and compaction requirements covered in the specification?

        (Yes   /   No   /   Unknown or N/A)

  2. Are limits of required select backfill zones clearly detailed on the plans?

        (Yes   /   No   /   Unknown or N/A)

  3. Are excavation requirements specified, e.g., safe slopes for excavations, need for sheeting, etc.?

        (Yes   /   No   /   Unknown or N/A)

  4. *Where alternative wall types will be allowed, are fully detailed plans included for all alternatives?

        (Yes   /   No   /   Unknown or N/A)

  5. Were designs prepared by the wall supplier?

        (Yes   /   No   /   Unknown or N/A)

  6. Were wall supplier's design calculations and specifications reviewed and approved by the structural and geotechnical engineers?

        (Yes   /   No   /   Unknown or N/A)

  7. *Where proprietary retaining walls are bid as alternates, does bid schedule require bidders to designate which alternate their bid is for, to prevent bid shopping after contract award?

        (Yes   /   No   /   Unknown or N/A)

  8. Have FHWA guidelines for experimental designations for certain proprietary wall types been followed?

        (Yes   /   No   /   Unknown or N/A)

  9. Is ROW limit or easements shown on plans and mentioned in specifications where anchors are to be installed?

        (Yes   /   No   /   Unknown or N/A)

Top-down Construction Type Walls
 (See "Manual for Design & Construction Monitoring of Soil Nail Walls", FHWA SA-96-069R and "Ground Anchors and Anchored Systems", FHWA IF-99-015)
  1. *For soil nail and anchor walls are the following included in the provisions:

    1. Construction tolerances?

          (Yes   /   No   /   Unknown or N/A)

    2. Minimum drill-hole size?

          (Yes   /   No   /   Unknown or N/A)

    3. Material requirements?

          (Yes   /   No   /   Unknown or N/A)

    4. Load testing procedures and acceptance criteria?

          (Yes   /   No   /   Unknown or N/A)

    5. Construction monitoring requirements?

          (Yes   /   No   /   Unknown or N/A)

*A response other than (yes) or (N/A) for any of these checklist questions is cause to contact the appropriate geotechnical engineer for a clarification and/or to discuss the project.

 

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Updated: 04/07/2011
 

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United States Department of Transportation - Federal Highway Administration