• 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
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
5,11,12Anchored 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
6,9,10CIP 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
Foundation Loading Information MemoNew3/17/2015Form
  • ​Microsoft Word document for requesting foundation loading information for piles and/or drilled piers
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)
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
8MSE 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
18Rock 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
Standard MSE Wall NotesRevised3/17/2015Notes
  • ​Revises note instructions for when to use 100-year design life for consistency with revised MSE wall policy
  • Deletes fence/handrail note for consistency with updated Roadway Design Manual
  • Adds or revises notes for SRW unit and fine aggregate use for consistency with revised MSE wall policy
  • Changes unit weight of fine aggregate to 115 pcf
  • Adds L/H ratio to note for minimum reinforcement length
  • Adds note instructions for requiring minimum embedment depth instead of minimum embedment elevation
  • Adds note for separation geotextile at back of reinforced zone
  • Adds note for designing wall for lateral load from foundations behind wall
Standard Precast and Segmental Gravity Wall NotesRevised3/17/2015Notes
  • Adds note instructions for requiring minimum embedment depth instead of minimum embedment elevation
  • Deletes fence/handrail note from precast gravity walls for consistency with updated Roadway Design Manual
453.02,03Standard Segmental Gravity Retaining WallsRevised3/17/2015Detail
  • Updates borders
  • Adds 2:1 or flatter back slope requirement
16.17Standard Shoring, Temporary Soil Nail WallsRevised3/17/2015Provision
  • ​Formats provisions for electronic plans
  • Updates grout requirements for new Grout Production and Delivery (Section 1003) provision
  • Addresses additional preconstruction meetings for temporary soil nail walls
  • Addresses field testing of grout for soil nails
SP11 R002Temporary ShoringRevised3/17/2015Provision
  • ​Updates grout requirements for new Grout Production and Delivery (Section 1003) provision
  • Addresses additional preconstruction meetings
  • Addresses field testing of grout for ground anchors
Temporary Shoring Recommendations and Standard Shoring Drawings MemosRevised3/17/2015Form
  • ​Updates memos for electronic plans
  • Renames standard drawing to standard detail
  • Adds PE Seal template
PE, LG & LSS Seal TemplateRevised1/20/2015Form
  • ​Adds Licensed Soil Scientist Seal to Microsoft Word template for creating PE, LG and LSS Seal images of the correct size
PE & LG Seal and Geotechnical Special Provision TemplatesNew11/18/2014Form
  • Microsoft Word templates for creating PE & LG Seal images of the correct size and Geotechnical Special Provisions with the correct formatting for electronic plans
Rock Core Storage TransmittalNew8/19/2014Form
  • ​Microsoft Excel form for transferring rock cores to storage
Settlement Gauge RecordNew4/15/2014Form
  • ​Records settlement gauge data for calculating incremental and total settlement
Drilled Pier Inspection Forms (Casing & Slurry Methods)Revised2/18/2014Form
  • ​Updates Western Regional Geotechnical Manager name
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