3 tied-back grade beams beach

8/2/2019 3 Tied-Back Grade Beams Beach

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Ohio Department ofOhio Department of

TransportationTransportation

Geohazards in Transportation in the Appalachian Region, August 4Geohazards in Transportation in the Appalachian Region, August 4--6, 20096, 2009

Tied-Back Grade Beams

for Stabilization ofState Route 7 in

Jefferson County, Ohio

Tied-Back Grade Beams

for Stabilization ofState Route 7 in

Jefferson County, Ohio


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OutlineOutline

Project Background

Exploration/Analysis/Design

Construction

Q & A

Project Background

Exploration/Analysis/Design

Construction

Q & A


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Location MapLocation Map

PENNSYLVANIAPENNSYLVANIA

WESTWEST

VIRGINIAVIRGINIA

OHIOOHIO

JEFFERSONJEFFERSON

CO.CO.

PROJECTPROJECT

SITESITE


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Plan ViewPlan View

BB--11BB--22

BB--33 BB--44

BB--55BB--66

BB--77

BB--88

BB--99

BB--1010BB--1111

BB--1212 BB--1313BB--1414

BB--1515BB--1616

BB--1717BB--1818

BB--1919BB--22

(ODOT 99)(ODOT 99)BB--11

(ODOT 99)(ODOT 99)BB--33

(ODOT 99)(ODOT 99)

Tension CrackTension Crack

BB--11

(ODOT 02)(ODOT 02)

S.R.7S.R.7

AA

AA


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Sta. 205+00 to Sta. 213+00Sta. 205+00 to Sta. 213+00

Centerline ProfileCenterline Profile State Route 7State Route 7

206+00206+00205+00205+00 207+00207+00 208+00208+00

620620

630630

650650

640640

660660

680680

670670

690690

700700

209+00209+00 210+00210+00 211+00211+00 212+00212+00 213+00213+00

620620

630630

650650

640640

660660

680680

670670

690690

700700

WW

Shale, gray, silty, hard

Shale, gray, silty to sandy,moderately hard to hard,weathered

Siltstone, gray, hard, waterstained, broken zones

Shale, light gray to olive, siltyto sandy, moderately hard,

water stained, broken zones

Shale, gray, moderately hard tohard, weathered, water stained

Siltstone, gray, hard

Shale, soil like, soft to stiff,dry, highly weathered

Shale, gray, silty, moderatelyhard to hard, weathered, withfrequent clay seams

Siltstone, hard, waterstained, highlyfractured

Shale, gray, moderatelyhard, clay mottling andbroken zones

Boring 1Boring 133.133.1 Rt.Rt.


Boring 6Boring 63333 Rt.Rt.


WW

Shale andSiltstone Bedrock

FillMaterials

Colluvium /Alluvium


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Cross Section ACross Section A--AA

690

680

670

660

650

640

630

620

610

Station 208+40.41Station 208+40.41

B-5

ExistingGroundline


Fill Materials

Colluvium / Alluvium

690

680

670

660

650

640

630

620

610

Approx. Phreatic

Surface

Approx. Top

of Rock

B-4

B-1 (ODOT 02)

RR Tracks


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Slope Inclinometer Data (B1)Slope Inclinometer Data (B1)


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Slope Inclinometer Data (B4)Slope Inclinometer Data (B4)


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Contributing Factors to Slope MovementContributing Factors to Slope Movement

Fill over colluvial/alluvial deposits with

soft zones Steeply sloping bedrock

Ohio River fluctuations

Possible increased shear stresses due toBrowns Island

Fill over colluvial/alluvial deposits with

soft zones Steeply sloping bedrock

Ohio River fluctuations

Possible increased shear stresses due toBrowns Island


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Alternative Stabilization SchemesAlternative Stabilization Schemes

Drilled Shafts ($3M) Drilled Shafts with Tiebacks ($3.4M)

Soldier Pile w/ Lagging and Tiebacks($3.5M)

Tiedback Grade Beams ($2M)

Drilled Shafts ($3M) Drilled Shafts with Tiebacks ($3.4M)

Soldier Pile w/ Lagging and Tiebacks($3.5M)

Tiedback Grade Beams ($2M)


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Typical SectionTypical Section

Approximate

Top of Rock

Rock Anchors

30

o

(Typ

.)

30o (Typ.)

36 (Typ.)

Bond Length

To Achieve 195k

Design Load (Typ.)

Rock Anchor InstallationRock Anchor Installation


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Cross Section ACross Section A--AA

Approx. Top

of Rock

690

680

670

660

650

640

630

620

610

Station 208+40.41Station 208+40.41

Tension Crack

Approx. Phreatic

Surface

Assumed Locationof Failure Surface

B-5 B-1

B-15

B-4


Fill Materials

Colluvium / Alluvium

ExistingGroundline

RR Tracks

690

680

670

660

650

640

630

620

610

12

3 4 5 6


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Anchor InformationAnchor Information

Anchor Information

Section

Force to be

ResistedP(kips/ft)

HorizontalComponentPx (kips/ft)

Horizontal

AnchorComponentTx (kips)

Total

NumberofAnchors

Numberof Rows

EstimatedAnchorSpacing

206+50 207+30 72.4 69.9 168.9 33 3 7.0

207+30 208+40 75.2 71.5 168.9 48 3 6.75

208+40 209+97 69.7 63.7 168.9 60 3 7.75

209+97 212+00 46.9 43.3 168.9 54 3 11.5209+97 212+00

(ALT)46.9 43.3 168.9 52 2 7.75

Total 195 (193)


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Post Remediation Stability AnalysisPost Remediation Stability Analysis

i i S i i A i


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Post Remediation Stability AnalysisPost Remediation Stability Analysis

of Slope Below Anchorsof Slope Below Anchors


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ConstructionConstruction

September 2008 May 2009 Contractor A. P. OHoro

Anchor Subcontractor SchnabelFoundations

Cost - $1.8M

September 2008 May 2009 Contractor A. P. OHoro

Anchor Subcontractor SchnabelFoundations

Cost - $1.8M


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Questions?Questions?

Thank You!

3 tied-back grade beams beach

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