Recent Central Texas MSE Wall Failures: Strategies and ...
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SWGEC 2021 June 22, 2021
Recent Central Texas MSE Wall Failures: Strategies and Solutions for RepairRyan Eaves, P.E.TxDOT Bridge DivisionGeotechnical Branch
SWGEC 2021
June 22, 2021
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SWGEC 2021 June 22, 2021
PROJECT DESCRIPTION
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I-35
SH 45
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SWGEC 2021 June 22, 2021
PROJECT DESCRIPTION
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456’
21’
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SWGEC 2021 June 22, 2021
PROJECT DESCRIPTION
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SWGEC 2021 June 22, 2021
Pavement Distress (Feb. 2016)
Lorem ipsum dolor sit amet, consectetur
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SWGEC 2021 June 22, 2021
Pavement Distress (Feb. 2016)
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SWGEC 2021 June 22, 2021
Drainage Pipe Inspection
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SWGEC 2021 June 22, 2021
Soil Boring/Monitoring
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Piezometer
Piezometer
Inclinometer
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SWGEC 2021 June 22, 2021
Soil Boring/Monitoring
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SWGEC 2021 June 22, 2021
Piezometer Monitoring
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SWGEC 2021 June 22, 2021
Inclinometer Monitoring
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SWGEC 2021 June 22, 2021
Temporary Stabilization (Block Surface)
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SWGEC 2021 June 22, 2021
Temporary Stabilization (Block Surface)
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SWGEC 2021 June 22, 2021
Temporary Stabilization (Sep. 2016)
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Shift traffic
Lanes on MSEW closed
CTB for temp. stabilization
Seal pavement crack
Monitor local slope stability and pavement distress
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SWGEC 2021 June 22, 2021
Drilled Shaft RW – Final Design
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SWGEC 2021 June 22, 2021
Drilled Shaft RW – Final Design
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SWGEC 2021 June 22, 2021
Drilled Shaft RW – Final Design
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SWGEC 2021 June 22, 2021
Drilled Shaft RW – Final Design
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42in DS @ 6’ spacing Precast Panel Facing RW Underdrain and Horizontal drain
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SWGEC 2021 June 22, 2021
Drilled Shaft RW – Final Design
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SWGEC 2021 June 22, 2021
Drilled Shaft RW – Construction (Dec. 2016)
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SWGEC 2021 June 22, 2021
Drilled Shaft RW – Construction
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SWGEC 2021 June 22, 2021
Drilled Shaft RW – Construction
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SWGEC 2021 June 22, 2021
Drilled Shaft RW – Construction
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SWGEC 2021 June 22, 2021
Drilled Shaft RW – Construction
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SWGEC 2021 June 22, 2021
Drilled Shaft RW – Construction
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SWGEC 2021 June 22, 2021
Drilled Shaft RW (June 2017)
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SWGEC 2021 June 22, 2021
IH-35 SB Mainlanes in West, TX
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SWGEC 2021 June 22, 2021
Retaining Wall Layout
32’ Maximum Height
1303’ Length
280’ Failure Width
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SWGEC 2021 June 22, 2021
May 14 – Initial Failure Symptoms
2’ – 3’ feet of settlement at the rail
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SWGEC 2021 June 22, 2021
May 14 – Initial Failure Symptoms
4” Joint opening
Circular Failure Cracking
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SWGEC 2021 June 22, 2021
May 14 – Initial Failure Symptoms
Cracking behind the rail near back of reinforced zone
Improper Drainage
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SWGEC 2021 June 22, 2021
May 17 – Progression and Placement of Temporary Buttress
Additional Settlement and Movement at Wall Face
Placement of Low Profile Barrier
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SWGEC 2021 June 22, 2021
May 17 – Progression and Placement of Temporary Buttress
6’ – 10’ Settlement at the Rail
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SWGEC 2021 June 22, 2021
Repair Options
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Remove and Replace
Tieback Anchors
Stabilization Berm
Drilled Shaft Wall
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SWGEC 2021 June 22, 2021
Design Considerations
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Sliding Check Controlled Design
Deflection Limit Controlled Drilled Shaft Size and Spacing
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SWGEC 2021 June 22, 2021
June 4th – 100% Plans Complete
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50’ Drilled Shaft Length
30’ Long – 0.5” Thick Casing
48” Drilled Shaft at 5’ Spacing
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SWGEC 2021 June 22, 2021
Wall Layout
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SWGEC 2021 June 22, 2021
Hitting a Moving Target
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Layout June 4th – 17’ Offset from wall face
Layout June 17th – 17’ to 22’ Offset from wall face
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SWGEC 2021 June 22, 2021
Construction
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SWGEC 2021 June 22, 2021
Construction
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SWGEC 2021 June 22, 2021
Lessons Learned
Ensure proper drainage above and below wall
Drilled shaft installation slowed down the failure significantly
Shaft installation was wet, indicating that water was conveyed through the failure surface
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SWGEC 2021 June 22, 2021
US-290 Frontage Road – Austin, TX
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SWGEC 2021 June 22, 2021
Retaining Wall Geometry
Excavation in front of wall results in loss of backfill material
Failure Centralized around Panel Columns 16-18
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SWGEC 2021 June 22, 2021
Failure Investigation
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SWGEC 2021 June 22, 2021
Failure Investigation
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SWGEC 2021 June 22, 2021
Behind the wall Face
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Void Extends 16’ behind wall face
Reinforcement Length is 22’
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SWGEC 2021 June 22, 2021
Failure Progression
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SWGEC 2021 June 22, 2021
Repair Options
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~20’ deep excavation 6’ in front of the wall
Need to address Failed Foundation material.
– Extends minimum 10’ behind the face of the wall
Need to remove trench box and recompact material in front of wall
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SWGEC 2021 June 22, 2021
Temporary Shoring Considerations
Need to avoid conflict with existing reinforcement to remain
Need to encompass the full failed zone
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SWGEC 2021 June 22, 2021
Isometric View
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SWGEC 2021 June 22, 2021
Foundation Improvement
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SWGEC 2021 June 22, 2021
Design Considerations
Additional Drilled shafts to shore cut in front of the wall
Provide additional stability for intermediate construction stages
Permanent Casing to provide additional stiffness
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SWGEC 2021 June 22, 2021
Stability Analysis
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SWGEC 2021 June 22, 2021
Failure Progression
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SWGEC 2021 June 22, 2021
Failure Progression
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SWGEC 2021 June 22, 2021
Construction
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TSS – Soldier Pile Lagging with closely spaced piles
Drill through the existing cement stabilized backfill ground improvement
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SWGEC 2021 June 22, 2021
Lessons Learned So Far
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Many unknowns, field adjustments may be necessary
– Limits of failed foundation material
– Limits of the void
– Condition of existing reinforcements
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SWGEC 2021 June 22, 2021 58
QUESTIONS:
Ryan Eaves, P.E.TxDOT Bridge Division – Geotechnical Branch
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SWGEC 2021 June 22, 2021
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