• 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
Private Engineering Firm (PEF) Box, GSI Supplemental Legend, Divider SheetNew9/20/2016Cell
  • ​Adds a new cell for a private engineering box (PEF) insert
  • Adds a new supplemental legend for Geological Strength Index (GSI) Tables for both 11x17 & 8.5x11 sheets
  • Updates title sheets for PEF box placeholder location and index lists for GSI supplemental legend
  • Revises Appendix Cover Sheet to be both an Appendix Cover Sheet and a Divider Sheet for separate PDF files
20,21Slab Jacking, PolyurethanesNew9/20/2016Provision
  • ​Addresses slab jacking with cementitious grout and polyurethane foam
  • Requires the use of a prequalified slab jacking contractor from the Subsurface Grouting Work Code
  • Pays for slab jacking in square feet of slab raised but also includes estimated quantities of grout and foam for bidding purposes
  • Addresses polyurethane foam materials for slab jacking, void filling, leak sealing, permeation grouting, subgrade stabilization and other applications
  • Specifies 3 types of polyurethane with various components and properties
  • Requires the use of an approved foam from the Approved Products List based on polyurethane type
13Cellular Confinement SystemsNew4/19/2016Provision
  • ​Addresses geocells on slope faces for erosion control
  • References Roadside Environmental’s Compost Blanket provision for filling geocells
12Reinforced Soil SlopesRevised4/19/2016Provision
  • Formats provision for electronic plans
  • Addresses additional preconstruction meetings
  • Removes permanent soil reinforcement matting (PSRM)
  • Adds coir fiber mat and matting for erosion control with shoulder and slope borrow and geocells with compost blanket for slope erosion control
  • Removes restriction on Class II and III select material in the reinforced zone
14Rock EmbankmentsRevised4/19/2016Provision
  • ​Formats provision for electronic plans
  • Revises construction methods and adds rip rap for filling voids in top of rock embankments
1803.01,02Standard Reinforced Soil Slope with High Groundwater, Standard Reinforced Soil Slope with Low GroundwaterRevised4/19/2016Detail
  • ​Removes permanent soil reinforcement matting (PSRM)
  • Adds coir fiber mat and matting for erosion control with shoulder and slope borrow and geocells with compost blanket for slope erosion control
  • Removes restriction on Class II and III select material in the reinforced zone
  • Renames standard drawing to standard detail
  • Revises LTDS and L/H Ratio table ranges to 12 ft increments
  • Creates 2 standard RSS details, one for high groundwater and another for low groundwater
SP10 R001MaterialsRevised3/15/2016Provision
  • ​Revises Class VII select material requirements
SP02 R088ABlastingNew2/16/2016Provision
  • Adds blast design criteria for production and trench blasting to Section 220
  • Adds blast design criteria, blasting requirements and a pay item for pre-splitting to Section 220
SP02 R088BBlastingNew2/16/2016Provision
  • ​Adds blast design criteria for production and trench blasting to Section 220
SP10 R025GeosyntheticsNew2/16/2016Provision
  • ​Replaces Section 1056
  • Incorporates current changes to Section 1056 from Materials provision
  • Revises geocomposite drain requirements
  • Adds strip drains and wick drains to geocomposite drains in Article 1056-1
  • Adds new Article 1056-6 for geocells
Geotechnical Summary TablesRevised2/16/2016Form
  • ​Removes permanent soil reinforcement matting (PSRM) from Summary of Reinforced Soil Slopes and Slope Erosion Control table and adds geocells, coir fiber mat and matting for erosion control to table
  • Adds table for pre-splitting of rock
  • Improves table appearances
SP10 R001MaterialsRevised2/16/2016Provision
  • ​Removes references to Section 1056 due to new Geosynthetics (Section 1056) provision
SP02 R085Rock and Broken Pavement FillsNew2/16/2016Provision
  • ​Revises construction methods and adds rip rap, stone and geotextiles to Section 235 for filling voids in top of rock and broken pavement fills
Temporary Shoring Recommendations, Standard Shoring Details and Sound Barrier Wall Foundation Recommendation MemosRevised11/9/2015Form
  • ​Updates format and letterhead for memos
  • Changes forms to templates
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
18Drilled 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
19Piles (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
Estimated Driven Pile Axial Resistance TableRevised10/2/2015Form
  • ​Renames "Field Bearing Chart" to "Estimated Driven Pile Axial Resistance Table"
  • Removes metric equivalents and drilled piers
  • Revises terminology for LRFD
  • Updates appearance and consolidates table layout to a single page
  • Revises factors for HP 12 x 53 piles with N values > 80 and 12 inch concrete piles with N values > 72
  • Changes required nominal resistance to 180 tons
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
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