• NCDOT Geotech Alerts

    NCDOT Geotech Alerts for revisions and additions to standards are sent via an email distribution list.  Please provide your name and email to be added to the Geotechnical Distribution List.

     

  
  
  
  
  
  
Summary of Changes
1Drilled Piers (LFD-ASD)Revised10/20/2015Provision
  • ​Revises definition of rock for purposes other than payment
  • Updates grout requirements for new Grout Production and Delivery (Section 1003) provision
  • Clarifies permanent casing definitions and descriptions
  • Addresses additional preconstruction meetings
  • Clarifies when drilled pier diameter may be 2" less than design diameter
  • Adds reference to Articles 107-11 and 107-12
17Drilled Piers (LRFD)New10/20/2015Provision
  • Revises definition of rock for purposes other than payment
  • Updates grout requirements for new Grout Production and Delivery (Section 1003) provision
  • Clarifies permanent casing definitions and descriptions
  • Addresses additional preconstruction meetings
  • Clarifies when drilled pier diameter may be 2" less than design diameter
  • Adds reference to Articles 107-11 and 107-12​
2Piles (LFD-ASD)Revised10/20/2015Provision
  • Formats provision for electronic plans
  • Updates provision based on current Section 450
  • Incorporates requirements for PDA and drilled-in piles to eliminate need for Pile Driving Analyzer (LFD-ASD) and Pile Excavation (LFD-ASD) provisions
  • Updates grout requirements for new Grout Production and Delivery (Section 1003) provision
  • Changes steel pile points and splicers acceptance to NCDOT approved products list
  • Adds requirement for PDA Consultant to develop pile driving criteria for bridges with PDA testing
18Piles (LRFD)New10/20/2015Provision
  • Updates grout requirements for new Grout Production and Delivery (Section 1003) provision
  • Changes steel pile points and splicers acceptance to NCDOT approved products list
  • Adds requirement for PDA Consultant to develop pile driving criteria for bridges with PDA testing to eliminate need for Pile Driving Criteria provision
SP02 R075Embankment Settlement GaugesRevised8/18/2015Provision
  • ​Revises payment for surcharges for lump sum grading projects
SP02 R065Surcharges and Waiting PeriodsRevised8/18/2015Provision
  • Revises payment for surcharges for lump sum grading projects
Pile Pay Items FormRevised8/11/2015Form
  • Removes note for Pile Driving Criteria provision
Temporary Shoring Recommendations, Standard Shoring Details and Sound Barrier Wall Foundation Recommendation MemosRevised8/11/2015Form
  • ​Updates letterhead for memos
  • Updates Assistant State Structures Engineer name for Sound Barrier Wall Foundation Recommendation memo
Load Request Memo TemplatesRevised8/3/2015Form
  • Makes minor cosmetic changes, typo corrections and language improvements
  • Rewords sentence for assumed site class and adds AASHTO reference with instructions
  • Adds footnote and instructions for vertical piles and integral end bents with drilled-in piles
Standard Foundation Notes (LFD-ASD)Revised7/31/2015Notes
  • Clarifies and improves wording of notes
  • Adds references to roadway plans for waiting periods, surcharges and settlement gauges
  • Updates references for revised geotechnical special provisions for piles and drilled piers (LFD-ASD)
  • Deletes and adds notes based on current LRFD standard foundation notes and revised Piles (LFD-ASD) provision
  • Adds new note for integral end bents with drilled-in piles
Standard Foundation Notes (LRFD)Revised7/31/2015Notes
  • Clarifies and improves wording of notes
  • Adds references to roadway plans for waiting periods, surcharges and settlement gauges
  • Adds and updates references for new geotechnical special provisions for piles and drilled piers (LRFD)
  • Adds new note for integral end bents with drilled-in piles
SP05 R017Class IV Subgrade Stabilization in Lieu of Chemical StabilizationNew6/16/2015Provision
  • ​Adds option to replace chemical stabilization with Class IV subgrade stabilization
SP09 R005Foundations and Anchor Rod Assemblies for Metal PolesRevised5/19/2015Provision
  • ​​Updates grout requirements for new Grout Production and Delivery (Section 1003) provision
SP10 R001MaterialsRevised5/19/2015Provision
  • ​Adds handling and storing instructions for shotcrete test panels to Article 1002-3
  • Revises acceptance criteria for borrow in Tables 1018-1 and 1018-2
  • Addresses identification of geotextiles in Article 1056-4
  • Adds geotextile type for geocomposite drain to Article 1056-5
Geotechnical Summary TablesRevised4/21/2015Form
  • ​Adds footnote to Summary of Aggregate Subgrade/Stabilization table for clarity
3,9,10Anchored Retaining Walls (LRFD), Soil Nail Retaining Walls (LFD-ASD), Soldier Pile Retaining Walls (LRFD)Revised3/17/2015Provision
  • ​Formats provisions for electronic plans
  • Updates grout requirements for new Grout Production and Delivery (Section 1003) provision
  • Corrects AASHTO LRFD Bridge Construction Specifications reference for trumpets for anchored walls
  • Adds surveying requirement for proposed slopes above and below walls
  • Addresses calculating passive resistance for piles in hard rock for anchored and soldier pile walls
  • Addresses additional preconstruction meetings
  • Addresses field testing of grout for ground anchors and soil nails
  • Adds requirement to check soil nail wall design with SnailWin program
  • Changes method of measurement for payment to include embedment and extension
Anchored, Soil Nail and Soldier Pile Wall Typicals & DetailsRevised3/17/2015Cell
  • ​Makes minor corrections to labels in anchored wall typical section
  • Adds top of leveling pad label to typical section for revised method of measurement
  • Revises anchored wall reinforced web details for clarity
  • Deletes fence/handrail reference from soldier pile walls with panels for consistency with updated Roadway Design Manual
4,7,8CIP Gravity Retaining Walls, Precast Gravity Retaining Walls (LRFD), Segmental Gravity Retaining Walls (LRFD)Revised3/17/2015Provision
  • ​Formats provisions for electronic plans
  • Renames standard drawing to standard detail
  • Adds surveying requirement for proposed slopes above and below precast and segmental gravity walls
  • Addresses additional preconstruction meetings
  • Changes method of measurement for payment to include embedment and extension
Concrete Ditch Behind Wall DetailsRevised3/17/2015Cell
  • ​Improves cells appearance
Estimated Wall Quantity Tables with InstructionsRevised3/17/2015Cell
  • ​Updates instructions for calculating wall quantity to include minimum embedment and extension
  • Clarifies table instructions
SP10 R020Grout Production and DeliveryNew3/17/2015Provision
  • Replaces Section 1003
  • Categorizes grout into types with descriptions of each
  • Adds grout type for slab jacking and compaction grouting
  • Updates/corrects grout testing procedures
  • Combines grout requirements for strength, shrinkage, flow/slump and durability into one table
  • Adds requirement to use packaged grouts that are on the approved products list (APL)
Load Request Memo TemplatesNew3/17/2015Form
  • ​Microsoft Word documents for requesting foundation loading information for piles and/or drilled piers
MSE Abutment Wall with Panels Typical & Details, MSE Wall Typicals & DetailsRevised3/17/2015Cell
  • ​Deletes fence/handrail references for consistency with updated Roadway Design Manual
  • Improves cells appearance
  • Adds clarification for direction of load for reinforcement connected to back of the cap for MSE abutment walls
  • Revises clearance between end bent and MSE abutment wall
  • Revises coping details
MSE Abutment Wall with SRW Units and End Bent on PilesNew3/17/2015Cell
  • ​Addresses MSE abutment wall with SRW Units and end bent on piles
6MSE Retaining Walls (LRFD)Revised3/17/2015Provision
  • ​Formats provision for electronic plans
  • Deletes “critical wall” terminology
  • Revises provision to require precast panels and coarse aggregate unless noted otherwise in the plans
  • Updates restrictions for MSE wall systems with an “Approved for Provisional Use” status (removed from MSE wall policy)
  • Updates electrochemical requirements for revised MSE Wall Aggregate Sampling and Testing Procedures
  • Revises bearing pad, coping and dowel requirements
  • Adds surveying requirement for proposed slopes above and below walls
  • Addresses additional preconstruction meetings
  • Addresses bracing piles for MSE abutment walls
  • Changes method of measurement for payment to include embedment and extension
PE Seal and BordersRevised3/17/2015Cell
  • ​Updates PE Seal to correct size and levels
  • Improves cells appearance
  • Removes GEU Office from Title Block
  • Resizes borders (slightly) for electronic plans
  • Renames standard drawing to standard detail
Precast Gravity Walls With and Without Back Slope TypicalsRevised3/17/2015Cell
  • ​Deletes fence/handrail references for consistency with updated Roadway Design Manual
16Rock Slope MaterialsRevised3/17/2015Provision
  • ​Formats provision for electronic plans
  • Updates grout requirements for new Grout Production and Delivery (Section 1003) provision
Standard Anchored, Soil Nail and Soldier Pile Wall NotesRevised3/17/2015Notes
  • ​Revises note instructions for when to use 100-year design life for consistency with revised MSE wall notes
  • Deletes fence/handrail note from soldier pile walls with panels for consistency with updated Roadway Design Manual
  • Revises notes to add design criteria for analyzing piles in hard rock for anchored and soldier piles walls
  • Adds note instructions for requiring minimum embedment depth instead of minimum embedment elevation
  • Adds note for designing wall for lateral load from foundations behind wall
453.01Standard CIP Gravity Retaining WallRevised3/17/2015Detail
  • Updates border
  • Adds top of footing label for standard CIP gravity wall for revised method of measurement
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