Hardin County KY-251 Spot Subgrade Stabilization Jackson Daugherty - - PowerPoint PPT Presentation

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Jul 29, 2023 344 likes •519 views

Hardin County KY-251 Spot Subgrade Stabilization Jackson Daugherty , PE, PMP Dusty Barrett , PE, PMP American Engineers, Inc. Project Highlights Karst, faulting and slumped sandstone Slope stability Subgrade stabilization Project

SLIDE 1

Hardin County KY-251

Spot Subgrade Stabilization

Jackson Daugherty, PE, PMP Dusty Barrett, PE, PMP American Engineers, Inc.

SLIDE 2

Project Highlights

▰ Karst, faulting and slumped sandstone ▰ Slope stability ▰ Subgrade stabilization

SLIDE 3

Project Setting

SLIDE 4

Karst

▰ Caves ▰ Sinkholes ▰ Karst ponds ▰ Slumped sandstone

SLIDE 5

Fault

▰ Slumped sandstone ▰ Deep overburden ▰ Fractured rock ▰ Seismic potential

SLIDE 6

Slope Stability

▰ Typical soil strength parameters ▰ NAVFAC 7.02 ▰ Long-term (effective) ▰ Intermediate-term (effective) ▰ Short-term (undrained)

SLIDE 7

Slope Stability

SLIDE 8

Slope Stability

▰ Triaxial Test ▰ Shear and saturation ▰ Pore pressure dissipation ▰ Predisposed failure plane (chert nodules) ▰ Lake Barkley

SLIDE 9

Slope Stability

▰ Future projects ▰ Reduce slopes ▰ Limit shear strength parameters

SLIDE 10

Subgrade Stabilization

▰ Chemical ▰ Stone ▰ Geogrid

SLIDE 11

Subgrade Stabilization

▰ Chemical ▰ Cement ▰ Lime https://www.youtube.com/watch?v=V5B5dv 9B3KE

SLIDE 12

Subgrade Stabilization

▰ Selecting the appropriate method ▰ Fines content ▰ Silts and sands

vs. clays

SLIDE 13

Subgrade Stabilization

▰ Lime ▰ Calcium cation exchange ▰ Flocculation-agglomeration ▰ Pozzolanic reaction ▰ pH ≥ 12.4

SLIDE 14

Subgrade Stabilization

▰ Cement ▰ Soil-cement ▰ Cement modified soil ▰ Hydration

SLIDE 15

Subgrade Stabilization

▰ Special Note ▰ Selection during bidding ▰ Multiple stabilization options ▰ Station limits indicated in report

SLIDE 16

Questions

Thanks for participating!

Jackson Daugherty, PE, PMP

jdaugherty@aei.cc

Dusty Barrett, PE, PMP

dbarrett@aei.cc