• 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
Geotechnical Design Cell LibraryNew1/16/2018Cell
  • Removes Standard Embankment Monitoring and Rock Plating Details because these details are Roadway Standard Drawings No. 235.01 and 275.01, respectively, in the 2018 Roadway Standard Drawings
  • Revises Standard CIP and Segmental Gravity Wall Detail Nos. and CIP, Segmental and Precast Gravity Wall Cells and Notes because these wall types are Sections 453, 454 and 455, respectively, in the 2018 Standard Specifications
  • Revises Notes for the Concrete Barrier Rail with Moment Slab Cell because barrier rails with moment slabs are incorporated into Section 460 in the 2018 Standard Specifications
  • Revises Soldier Pile Wall Cell and Note because Section 442 is rewritten in the 2018 Standard Specifications
  • Revises MSE Wall Notes and MSE Abutment Wall Cells because bridge approach fill details and provisions will be significantly changed for 2018 lettings
Standard Foundation Notes (LRFD)Revised1/1/2018Notes
  • ​Adds new note for MSE abutment walls
  • Updates notes for 2018 Standard Specifications
3,9,10Anchored Retaining Walls (LRFD), Soil Nail Retaining Walls (LFD-ASD), Soldier Pile Retaining Walls (LRFD)Revised5/16/2017Provision
  • ​Revises materials for most recent Geosynthetics (Section 1056) Provision
  • Updates geocomposite drains for most recent Geosynthetics (Section 1056) Provision
Anchored, Soil Nail and Soldier Pile Wall TypicalsRevised5/16/2017Cell
  • ​Updates geocomposite drains for most recent Geosynthetics (Section 1056) Provision
Drilled Piers (LRFD)Revised5/16/2017Provision
  • ​ Replaces Table 411-3 from the Standard Specifications with specific polymer slurry requirements for each approved polymer
  • Adds exception to method of measurement for SPT testing
6MSE Retaining Walls (LRFD)Revised5/16/2017Provision
  • Clarifies and improves wording
  • Adds electrochemical testing requirements for coarse aggregate from coastal plain sources
  • Adds exceptions to FHWA requirements for rubber bearing pads
  • Adds minimum gauge thickness for steel strip reinforcement
  • Adds aluminized coating as an option for steel strip reinforcement
  • Removes geostrips
  • Replaces prequalification with other requirements for engineers designing MSE panel walls
  • Addresses gap between concrete barrier and MSE wall facing
  • Adds corrugated steel pipes for pile sleeves
  • Adds polypropylene geogrid reinforcement for MSE abutment walls with polyester type (PET) geogrid reinforcement connected to SRW units
  • Adds materials for PET geogrid reinforcement vertical obstruction detail
MSE Wall Typicals and DetailsNew5/16/2017Cell
  • ​Adds 2 new abutment wall cells with pile sleeves
  • Adds polypropylene geogrid reinforcement to abutment wall cells for MSE abutment walls with polyester type (PET) geogrid reinforcement connected to SRW units
  • Adds geogrid cap connection detail to MSE abutment wall with SRW units cells
  • Adds a new cell for PET geogrid obstruction details for MSE segmental walls and moves leveling pad detail for SRW units to this cell
Piles (LRFD)Revised5/16/2017Provision
  • Adds requirement for when to use AASHTO driving stress limits for severe corrosive environments
  • Adds new pile driving equipment setup pay items​
7,8,10Precast Gravity Retaining Walls (LRFD), Segmental Gravity Retaining Walls (LRFD), Soldier Pile Retaining Walls (LRFD)Revised5/16/2017Provision
  • ​Addresses gap between concrete barrier and wall facing
Precast Gravity, Segmental Gravity and Soldier Pile Wall TypicalsRevised5/16/2017Cell
  • ​Addresses gap between concrete barrier and wall facing
453.01Standard CIP Gravity Retaining WallRevised5/16/2017Detail
  • ​Adds label to top of footing for payment purposes
Standard MSE Wall NotesRevised5/16/2017Notes
  • ​Adds new pile sleeve notes
Geotechnical Design Cell LibraryRevised1/20/2017Cell
  • Adds a new cell for private engineering box (PEF) insert
  • Updates borders and cells for PEF box placeholder location
  • Makes all notes in cells independent of each other to make drafting easier and adds note placeholders that do not print
Geotechnical Cell LibraryNew9/20/2016Cell
  • ​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
1 - 30Next
Was this page helpful?