![Page 1: Scott Hidden, P.E. Support Services Supervisor ... · Scott Hidden, P.E. Support Services Supervisor . Geotechnical Engineering Unit (GEU) o It is a standard maintained by the Technical](https://reader030.vdocument.in/reader030/viewer/2022011801/5b03b2377f8b9a2e228cc7c2/html5/thumbnails/1.jpg)
Scott Hidden, P.E. Support Services Supervisor
Geotechnical Engineering Unit (GEU)
![Page 2: Scott Hidden, P.E. Support Services Supervisor ... · Scott Hidden, P.E. Support Services Supervisor . Geotechnical Engineering Unit (GEU) o It is a standard maintained by the Technical](https://reader030.vdocument.in/reader030/viewer/2022011801/5b03b2377f8b9a2e228cc7c2/html5/thumbnails/2.jpg)
o It is a standard maintained by the Technical Support Group of the GEU Support Services Section
o Standard provisions and drawings are effective with some letting date and are intended to be used as is
o Standard notes and cells should be included and modified based on project specific designs
o Do not assume that a standard is applicable to every situation!
![Page 3: Scott Hidden, P.E. Support Services Supervisor ... · Scott Hidden, P.E. Support Services Supervisor . Geotechnical Engineering Unit (GEU) o It is a standard maintained by the Technical](https://reader030.vdocument.in/reader030/viewer/2022011801/5b03b2377f8b9a2e228cc7c2/html5/thumbnails/3.jpg)
o Complexity vs. Conservatism o If a standard is to complex, it will not get used o If a standard is to conservative, it will not be widely
applicable or if it is, it will be too expensive
![Page 4: Scott Hidden, P.E. Support Services Supervisor ... · Scott Hidden, P.E. Support Services Supervisor . Geotechnical Engineering Unit (GEU) o It is a standard maintained by the Technical](https://reader030.vdocument.in/reader030/viewer/2022011801/5b03b2377f8b9a2e228cc7c2/html5/thumbnails/4.jpg)
o All major types of retaining walls (MSE, Gravity, Soil Nail, Soldier Pile and Anchored)
o Rock Embankments o Rock Plating o Reinforced Soil Slopes (RSS) o Embankment Monitoring o Standard Shoring and Temporary Soil Nail Walls o Rock Slope Materials o Pile Driving Criteria o Geotextile for Pavement Stabilization
![Page 5: Scott Hidden, P.E. Support Services Supervisor ... · Scott Hidden, P.E. Support Services Supervisor . Geotechnical Engineering Unit (GEU) o It is a standard maintained by the Technical](https://reader030.vdocument.in/reader030/viewer/2022011801/5b03b2377f8b9a2e228cc7c2/html5/thumbnails/5.jpg)
o Polymer Slurries o MSE Retaining Wall Systems (for panels and
SRW units) o SRW Units for Standard Segmental Gravity Walls o Pile Points and Splicers o Wire Mesh and Nets o Geogrids (administered by M&T) o Geotextiles (under development) o Precast Retaining Wall Units (future
development)
![Page 6: Scott Hidden, P.E. Support Services Supervisor ... · Scott Hidden, P.E. Support Services Supervisor . Geotechnical Engineering Unit (GEU) o It is a standard maintained by the Technical](https://reader030.vdocument.in/reader030/viewer/2022011801/5b03b2377f8b9a2e228cc7c2/html5/thumbnails/6.jpg)
o GEU Website – connect.ncdot.gov/resources/geological
o NCDOT Approved Product Lists – https://apps.dot.state.nc.us/vendor/approvedproducts/
o Geotechnical Design Cell Library – Geotechnical_Design_English.cel
o GEU Contacts – Scott Hidden (919) 707-6856, [email protected]
or Eric Williams (919) 707-6876, [email protected]
![Page 7: Scott Hidden, P.E. Support Services Supervisor ... · Scott Hidden, P.E. Support Services Supervisor . Geotechnical Engineering Unit (GEU) o It is a standard maintained by the Technical](https://reader030.vdocument.in/reader030/viewer/2022011801/5b03b2377f8b9a2e228cc7c2/html5/thumbnails/7.jpg)
Sign up for the Geotechnical Distribution
List to receive NCDOT Geotech Alerts
(it’s free and we promise not to flood your inbox or use your email for marketing
purposes!)
![Page 8: Scott Hidden, P.E. Support Services Supervisor ... · Scott Hidden, P.E. Support Services Supervisor . Geotechnical Engineering Unit (GEU) o It is a standard maintained by the Technical](https://reader030.vdocument.in/reader030/viewer/2022011801/5b03b2377f8b9a2e228cc7c2/html5/thumbnails/8.jpg)
o Determine minimum required reinforcement length from table on sheet 3 (global stability or pullout controls)
o Standard temporary wall example o Surcharge case with H = 18 ft o Class III select material for shoring backfill in the reinforced zone o Groundwater depth below bottom of reinforced zone is 10 ft
![Page 9: Scott Hidden, P.E. Support Services Supervisor ... · Scott Hidden, P.E. Support Services Supervisor . Geotechnical Engineering Unit (GEU) o It is a standard maintained by the Technical](https://reader030.vdocument.in/reader030/viewer/2022011801/5b03b2377f8b9a2e228cc7c2/html5/thumbnails/9.jpg)
o Determine minimum required geotextile reinforcement strength from table on sheet 3 (strength controls)
o Standard temporary wall example (continued) o Surcharge case with H = 18 ft and 18" of embedment (minimum) o Class III select material for shoring backfill in the reinforced zone o Groundwater depth below bottom of reinforced zone is 10 ft
![Page 10: Scott Hidden, P.E. Support Services Supervisor ... · Scott Hidden, P.E. Support Services Supervisor . Geotechnical Engineering Unit (GEU) o It is a standard maintained by the Technical](https://reader030.vdocument.in/reader030/viewer/2022011801/5b03b2377f8b9a2e228cc7c2/html5/thumbnails/10.jpg)
o Reinforcement layers for standard temporary walls are numbered from the top down!
![Page 11: Scott Hidden, P.E. Support Services Supervisor ... · Scott Hidden, P.E. Support Services Supervisor . Geotechnical Engineering Unit (GEU) o It is a standard maintained by the Technical](https://reader030.vdocument.in/reader030/viewer/2022011801/5b03b2377f8b9a2e228cc7c2/html5/thumbnails/11.jpg)
o Select geotextile reinforcement that meets standard shoring provision (type 5 and 8 oz/sy mass per unit area) and ultimate tensile strength requirements in the MD
o Standard temporary wall example (continued) o For Mirafi HP geotextile series, ultimate tensile strength (wide width tensile
strength) ranges from 2640 to 7200 lb/ft and 2400 to 6000 lb/ft is required
![Page 12: Scott Hidden, P.E. Support Services Supervisor ... · Scott Hidden, P.E. Support Services Supervisor . Geotechnical Engineering Unit (GEU) o It is a standard maintained by the Technical](https://reader030.vdocument.in/reader030/viewer/2022011801/5b03b2377f8b9a2e228cc7c2/html5/thumbnails/12.jpg)
Standard Concrete Ditch Behind Wall for all retaining wall types - modified roadway standard base ditch
![Page 13: Scott Hidden, P.E. Support Services Supervisor ... · Scott Hidden, P.E. Support Services Supervisor . Geotechnical Engineering Unit (GEU) o It is a standard maintained by the Technical](https://reader030.vdocument.in/reader030/viewer/2022011801/5b03b2377f8b9a2e228cc7c2/html5/thumbnails/13.jpg)
o Drilled Pier Axial Resistance Spreadsheet o Calculates developed factored side and tip
resistances and required tip resistance for drilled piers in sand, clay, IGM, weathered rock and hard rock
o Follows LRFD design based on AASHTO 6th Edition o Incorporates NCDOT GEU design policy for drilled
piers in weathered rock (material classification not covered in AASHTO)
o Includes tip resistance methods based on both RMR and GSI
![Page 14: Scott Hidden, P.E. Support Services Supervisor ... · Scott Hidden, P.E. Support Services Supervisor . Geotechnical Engineering Unit (GEU) o It is a standard maintained by the Technical](https://reader030.vdocument.in/reader030/viewer/2022011801/5b03b2377f8b9a2e228cc7c2/html5/thumbnails/14.jpg)