pomeroy-mason bridge over the ohio river osterberg cell ... kr… · bridge over the ohio river”...

Geohazards in TransportationGeohazards in TransportationAppalachian Region Technical ForumAppalachian Region Technical Forum

August 3August 3--4, 20054, 2005

““Drilled Shafts for Bridge Foundation Drilled Shafts for Bridge Foundation Stability Improvement: Ohio 833 Stability Improvement: Ohio 833

Bridge over the Ohio RiverBridge over the Ohio River””

Meigs County, OhioMeigs County, OhioMason County, West VirginiaMason County, West Virginia

ByByStan Harris, P.E. and Eric Kistner, P.E.Stan Harris, P.E. and Eric Kistner, P.E.

FMSM EngineersFMSM Engineers


August 3August 3--4, 20054, 2005

Project LocationProject Location

Pomeroy, Ohio


August 3August 3--4, 20054, 2005

Project TeamProject Team

Owner: ODOT/WVDOTOwner: ODOT/WVDOTDesigner: URS CorporationDesigner: URS CorporationContractor: Mahan/National Joint Contractor: Mahan/National Joint

VentureVentureGeotechnical Consultant Geotechnical Consultant –– FMSM FMSM


August 3August 3--4, 20054, 2005

Existing StructureExisting StructureOHIO

WEST VIRGINIA


August 3August 3--4, 20054, 2005

Proposed StructureProposed Structure

WEST VIRGINIA

OHIO


August 3August 3--4, 20054, 2005

Project TimelineProject Timeline2000 2001 2002 2003 2004 2005

FMSM Geotechnical Exploration

Bridge Design Bridge Construction

Slope Monitoring

Slope Movement Detected

Construction of Protective Measures

Monitoring of Protective Measures


August 3August 3--4, 20054, 2005

BackgroundBackground

Slope Inclinometers/Controlled RateSlope Inclinometers/Controlled Rate--ofof--FillFillInitial Detection of MovementInitial Detection of MovementAdditional InstrumentationAdditional InstrumentationExtents of MovementExtents of Movement


August 3August 3--4, 20054, 2005

Probable Causes of Slope Probable Causes of Slope MovementMovement

Weak slickensided clay shale Weak slickensided clay shale (mudstone)(mudstone)Possible ancient movementPossible ancient movementConstruction activity/embankmentConstruction activity/embankmentRapid drawdown cycles of Ohio RiverRapid drawdown cycles of Ohio River


August 3August 3--4, 20054, 2005

Extents of Slope MovementExtents of Slope Movement

Approximate Limits of Slope

Movement


August 3August 3--4, 20054, 2005

Slope Geology/GeometrySlope Geology/Geometry

Shale/Clay Shale/Mudstone Bedrock

Alluvial Silt and ClayExisting Fill

New Fill

Ohio River

Apparent Failure Surface

Residual Clay

Siltstone


August 3August 3--4, 20054, 2005

Options for StabilizationOptions for Stabilization

Drilled Shafts Drilled Shafts –– Cantilevered or Tied Cantilevered or Tied BackBackTruncated Drilled ShaftsTruncated Drilled ShaftsTiedTied--Back Precast Concrete PanelsBack Precast Concrete Panels


August 3August 3--4, 20054, 2005

Option 1: Drilled ShaftsOption 1: Drilled Shafts



New Fill

Ohio River


Residual Clay

Siltstone


August 3August 3--4, 20054, 2005

Option 2: Truncated Drilled ShaftsOption 2: Truncated Drilled Shafts



New Fill

Ohio River


Residual Clay

Siltstone


August 3August 3--4, 20054, 2005

Option 3: Tied Back Precast Option 3: Tied Back Precast Concrete PanelsConcrete Panels

Shale/Clay Shale/Mudstone Bedrock Alluvial Silt and Clay

Existing Fill

New Fill

Ohio River


Residual Clay

Siltstone


August 3August 3--4, 20054, 2005

ODOTODOT’’s Preferred Option and s Preferred Option and Related DecisionsRelated Decisions

Drilled shafts with no tiebacksDrilled shafts with no tiebacksRealign Main StreetRealign Main StreetOhio TouchOhio Touch--Down Pier and Down Pier and Abutment FoundationsAbutment FoundationsInstrumentation ProgramInstrumentation Program


August 3August 3--4, 20054, 2005

Stabilization Shaft Design Stabilization Shaft Design MethodologyMethodology

LimitLimit--Equilibrium methodEquilibrium method--ofof--slices slices used to determine net driving forcesused to determine net driving forcesThe force per drilled shaft The force per drilled shaft determined by Dr. Liangdetermined by Dr. Liang’’s (U. of s (U. of Akron) method, which takes into Akron) method, which takes into account arching between shafts account arching between shafts LPileLPile Analysis Analysis


August 3August 3--4, 20054, 2005

Final Design for Bridge Foundation StabilizationFinal Design for Bridge Foundation Stabilization

8’ Diameter Drilled Shafts on 12’ c/c Spacing


August 3August 3--4, 20054, 2005

Revised Roadway PlanRevised Roadway Plan


August 3August 3--4, 20054, 2005

InstrumentationInstrumentation

Existing Bridge Existing Bridge –– tiltmeters, tiltmeters, thermistors, survey targetsthermistors, survey targetsTouchTouch--Down Pier Shafts Down Pier Shafts –– strain strain gauges, inclinometer casinggauges, inclinometer casingStabilization Shafts Stabilization Shafts –– strain gauges, strain gauges, thermistors, inclinometer casing, thermistors, inclinometer casing, tiltmeterstiltmeters


August 3August 3--4, 20054, 2005

Stabilization Shaft Instrumentation PlanStabilization Shaft Instrumentation Plan


August 3August 3--4, 20054, 2005


August 3August 3--4, 20054, 2005

Preliminary Results of Preliminary Results of Instrumentation/Monitoring ProgramInstrumentation/Monitoring ProgramSlope Inclinometers Slope Inclinometers –– Limits of movement Limits of movement slowly moving toward new bridgeslowly moving toward new bridgeExisting Bridge Existing Bridge –– No significant movement No significant movement of the abutment or piersof the abutment or piersNew Bridge TouchNew Bridge Touch--Down Pier Down Pier –– No No apparent lateral loading or movement apparent lateral loading or movement detected (interpretation complicated by detected (interpretation complicated by construction activity)construction activity)Stabilization Drilled Shafts Stabilization Drilled Shafts –– Minimal data Minimal data collected to datecollected to date


August 3August 3--4, 20054, 2005

TouchTouch--Down Pier Instrumentation Data Down Pier Instrumentation Data Slope InclinometersSlope Inclinometers


August 3August 3--4, 20054, 2005

TouchTouch--Down Pier Instrumentation Down Pier Instrumentation Strain GaugesStrain Gauges

“Drilled Shafts for Bridge Foundation Stability Improvement: Ohio 833 �Bridge over the Ohio River”��Meigs County, Ohio�MasonProject LocationProject TeamExisting StructureProposed StructureProject TimelineBackgroundProbable Causes of Slope MovementExtents of Slope MovementSlope Geology/GeometryOptions for StabilizationOption 1: Drilled ShaftsOption 2: Truncated Drilled ShaftsOption 3: Tied Back Precast Concrete PanelsODOT’s Preferred Option and Related DecisionsStabilization Shaft Design MethodologyFinal Design for Bridge Foundation StabilizationRevised Roadway PlanInstrumentationStabilization Shaft Instrumentation PlanPreliminary Results of Instrumentation/Monitoring ProgramTouch-Down Pier Instrumentation Data �Slope InclinometersTouch-Down Pier Instrumentation �Strain Gauges

pomeroy-mason bridge over the ohio river osterberg cell ... kr… · bridge over the ohio river”...

Documents