retaining wall design slope stability on us 189 maquigr engineering
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Picture of (site) Capstone Team Who we are (Members skills) Maquigr team beyond Shows fractured rocks Pictures displayed . Retaining Wall Design Slope Stability on US-189 MAQuiGr Engineering. Matthew Hakes, Quinton Taylor, Greg Hanks. Site 1. Site Evaluation. Site 2.

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retaining wall design slope stability on us 189 maquigr engineering

Picture of (site)

Capstone Team Who we are (Members skills)

Maquigr team beyond

Shows fractured rocks

Pictures displayed

Retaining Wall Design

Slope Stability on US-189

MAQuiGrEngineering

Matthew Hakes, Quinton Taylor, Greg Hanks

site evaluation

Site 1

Site Evaluation

Site 2

Site 1 is featured on top

Site 2 on bottom

Notice:

Water location

Temporary solutions

Loads caused by road

considered solutions
Considered Solutions

Sheet pile

Pros Rapid Construction

Cons

Shallow rock makes it impossible to dig in deep enough to get moment

Gabion

Tieback

Sheetpile

Tieback

Shotcrete

Soil Nail

analysis with snailplus
Analysis with SnailPlus

Assumptions made:

  • Two different soil types
    • Gravel/Sand
    • Bedrock
  • Loading
    • Temporary Max: 700 psf from construction
    • Permanent Max: 200 psf from traffic
  • Morgenstern-Price
    • General limit equilibrium (Moment-force)
  • FHWA factors of safety used
analysis with snailplus1
Analysis with SnailPlus
  • Under construction loading conditions
  • Under normal traffic loads
final design
Final Design
  • 10ft from road edge
  • 120ft in length
  • 17 Total Soil Nails

Initial conception of wall shape

Created slope in AUTO cad

Unified design 1/2 the distance Follow slope or what

Optimized for construction

  • Average height, 6ft
  • Max height, 13ft
phase 1
Phase 1

Site Preparation

  • Conducted during low traffic flow
  • Close southbound lane
  • Flaggers to direct flow of traffic

through single lane

Environmental Impact Reduction

(3 lines of defense)

  • Excavated 5ft bench
  • 1ft silt fence installed 20ft below excavation line
  • Exposed Shoreline
phase 2
Phase 2

Excavation Slope Preparation

  • 5ft bench approximately 10ft out from edge of the road
  • Excavation of 1,000 cubic feet
  • Soil relocated to holding site
phase 3

Soil Nail Installation

Phase 3
  • Williams Geo-Drill Injection Anchor System with rotary percussive drilling
  • In case of hitting hard rock, a Polyester Resin Rock Anchor System may be used
phase 4
Phase 4

Prefabrication of Rebar Cages

  • Phase 4:
  • Constructed offsite due to limited space
  • 75 year design life, hot-dip galvanizing
phase 5

Installing Rebar Cages

Phase 5
  • Challenge will be mobility and visibility of excavator
  • Guided into place by multiple workers located on bench

The key to the project was contstruction speed

8 in mat

Number 6 rebar

Tied together

Bring in on flat bead and then drop in excavator secure them in place

phase 6

Shotcrete

Phase 6
  • Two step process using wire mesh as backstop for shotcrete
  • First day application spraying towards the road, second day other side is applied

A problem (wall needs concrete)

solution we could pump it with shotcrete

Bench was created for workers to stand on

No wall – wire mesh 2 sided

slide13

Installing Drainage System

Phase 7

Phase 5:

  • Composite Drainage system
  • Drainage system includes: geosythetic filtered fabric and molded plastic core
phase 8

Anchor to wall Attachments

Phase 8
  • Bearing plate, hardened washers, hex nut, and Geo-Drill Injection Anchor
  • 75 year design life, galvanizing bearing plate and hardened washers and capped with a steel tube filled with cement grout
phase 9
Phase 9

Backfill

  • Using the soil from the excavation, backfill at 8-12in lifts
  • Compact soil with plate compactor attachment while avoiding soil nails
  • Increased bar size to improve bending strength in the case of accidental contact with compactor
phase 10

Capping

Phase 10

Phase 11

Cleanup

  • Phase 10:
  • Last 4-6in of backfill will be filled with cement to cap off the retaining system
  • Reduce permeability of surface and prevent corrosion

Phase 11:

  • Remove silt fencing and any loose material
  • Add soil to bench to create a more natural slope
  • Application of hydroseed to slope to promote vegetation growth
time and cost estimates
Time and Cost Estimates

Cost

The Federal Highway administration

Charcteristics that cost $$$

Location, material, night time ect

Schedule

How we came up

Integrating phases to opomize time

  • Cost estimates are based on the FHWA pricing graph and scheduling was created in 11 phases
conclusion
Conclusion

A soil nail retaining system is the best option for this project

  • Adaptable – Depending on what is encountered during construction this design can easily be modified to meet the needs of the project
  • Cost Effective – With little excavation near the road, a temporary wall will be unnecessary
  • 75 Design Life – Simple methods that can be implicated to increase design life
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