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Geotechnical Engineering

 

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

GTR Review Checklist for Driven Piles


G. Structure Foundations - Driven Piles

 (Pgs. 8-1 to 8-29, 9-1 to 9-35)

In addition to the basic information listed in Section A, if pile support is recommended or given as an alternative, conclusions/recommendations should be provided in the project geotechnical report for the following:

  1. *Is the recommended pile type given (displacement, non-displacement, steel pipe, concrete, H-pile, etc.) with valid reasons given for choice and/or exclusion? (Pgs. 8-1 to 8-3)

        (Yes   /   No   /   Unknown or N/A)

  2. Do you consider the recommended pile type(s) to be the most suitable and economical?

        (Yes   /   No   /   Unknown or N/A)

  3. *Are estimated pile lengths and estimated tip elevations given for the recommended allowable pile design loads?

        (Yes   /   No   /   Unknown or N/A)

  4. Do you consider the recommended design loads to be reasonable?

        (Yes   /   No   /   Unknown or N/A)

  5. Has pile group settlement been estimated (only of practical significance for friction pile groups ending in cohesive soil)? (Pgs. 8-20 to 8-22)

        (Yes   /   No   /   Unknown or N/A)

  6. If a specified or minimum pile tip elevation is recommended, is a clear reason given for the required tip elevation, such as underlying soft layers, scour, downdrag, piles uneconomically long, etc.?

        (Yes   /   No   /   Unknown or N/A)

  7. *Has design analysis (wave equation analysis) verified that the recommended pile section can be driven to the estimated or specified tip elevation without damage (especially applicable where dense gravel-cobble-boulder layers or other obstructions have to be penetrated)?

        (Yes   /   No   /   Unknown or N/A)

  8. Where scour piles are required, have pile design and driving criteria been established based on mobilizing the full pile design capacity below the scour zone?

        (Yes   /   No   /   Unknown or N/A)

  9. Where lateral load capacity of large diameter piles is an important design consideration, are p-y curves (load vs. deflection) or soil parameters given in the geotechnical report to allow the structural engineer to evaluate lateral load capacity of all piles?

        (Yes   /   No   /   Unknown or N/A)

  10. *For pile supported bridge abutments over soft ground:

    1. Has abutment downdrag load been estimated and solutions such bitumen coating been considered in design? Not generally required if surcharging of the fill is being performed. (Pgs. 8-21, 8-23)

          (Yes   /   No   /   Unknown or N/A)

    2. Is bridge approach slab recommended to moderate differential settlement between bridge ends and fill?

          (Yes   /   No   /   Unknown or N/A)

    3. If the majority of subsoil settlement will not be removed prior to abutment construction (by surcharging), has estimate been made of abutment rotation that can occur due to lateral squeeze of soil subsoil? (Pgs. 5-25, 5-26)

          (Yes   /   No   /   Unknown or N/A)

    4. Does the geotechnical report specifically alert the structural designer to the estimated horizontal abutment movement?

          (Yes   /   No   /   Unknown or N/A)

  11. If bridge project is large, has pile load test program been recommended? (Pgs. 9-23 to 9-26)

        (Yes   /   No   /   Unknown or N/A)

  12. For major structure in high seismic risk area, has assessment been made of liquefaction potential of foundation soil during design earthquake (only loose saturated sands and silts are susceptible to liquefaction)? (See GEC No. 3, FHWA SA-97-076)

        (Yes   /   No   /   Unknown or N/A)

Construction Considerations
 (Pgs. 9-4 to 9-35)
  1. Pile driving details such as: boulders or obstructions which may be encountered during driving; need for preaugering, jetting, spudding; need for pile tip reinforcement; driving shoes, etc.?

        (Yes   /   No   /   Unknown or N/A)

  2. Excavation requirements: safe slope for open excavations; need for sheeting or shoring; fluctuation of groundwater table?

        (Yes   /   No   /   Unknown or N/A)

  3. Have effects of pile driving operation on adjacent structures been evaluated such as protection against damage caused by footing excavation or pile driving vibrations?

        (Yes   /   No   /   Unknown or N/A)

  4. Is preconstruction condition survey to be made of adjacent structures to prevent unwarranted damage claims?

        (Yes   /   No   /   Unknown or N/A)

  5. On large pile driving projects, have other methods of pile driving control been considered such as dynamic testing or wave equation analysis?

        (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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