Rock Cut-Slope Design and Construction Auxiliary Spillway ... 2/Mic… · From Hoek, E. and Bray,...

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One Corps, One Regiment, One Team Rock Cut Rock Cut - - Slope Slope Design and Construction Design and Construction Auxiliary Spillway and Auxiliary Spillway and Relocation of SR 3051 & 302 Relocation of SR 3051 & 302 Dewey Lake, KY Dewey Lake, KY Michael Nield Michael Nield - - Geologist Geologist Geohazards in Transportation in the Appalachian Regio Geohazards in Transportation in the Appalachian Regio

Transcript of Rock Cut-Slope Design and Construction Auxiliary Spillway ... 2/Mic… · From Hoek, E. and Bray,...

  • One Corps, One Regiment, One Team

    Rock CutRock Cut--Slope Slope Design and ConstructionDesign and Construction

    Auxiliary Spillway andAuxiliary Spillway andRelocation of SR 3051 & 302 Relocation of SR 3051 & 302

    Dewey Lake, KYDewey Lake, KY

    Michael Nield Michael Nield -- GeologistGeologist

    Geohazards in Transportation in the Appalachian RegionGeohazards in Transportation in the Appalachian Region

  • One Corps, One Regiment, One Team

    Four Main Topics of DiscussionFour Main Topics of Discussion

    Auxiliary Spillway Auxiliary Spillway –– Dewey Lake, KYDewey Lake, KY

    1. Project Description1. Project Description2. Site Geology2. Site Geology3. Rock Cut3. Rock Cut--Slope DesignSlope Design4. Construction Challenges4. Construction Challenges

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYProject DescriptionProject Description

    DEWEY DAM

    Located in Eastern Kentucky

    Dam completed in 1949

    Rolled earth embankment dam with a tunnel type outlet works in the left abutment.

    Huntington District

    SR 302

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYProject DescriptionProject Description

    Hydrologic Deficiencies at Dewey Dam

    Dam Safety Assurance Program identified deficiencies with the existing spillway during predicted floods, resulting in a high risk of dam failure with catastrophic consequences downstream.

    Correction:Raise the Dam crest (future work)Raise crest of Brandy Keg Dike (this contract)Restrict flows to the Existing Spillway (this contract)Construct 129’ wide Auxiliary Spillway (this contract) Relocate State Routes 302 and 3051 (this contract)

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYProject DescriptionProject Description

    Project Features Impacted by Hydrologic Deficiencies

    Dam

    Auxiliary Spillway & St. Rt. 3051 & 302

    Brandy Keg Dike

    Existing Spillway

    Relocation of St. Rt. 302

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYProject DescriptionProject DescriptionExisting Spillway

    Existing spillway was not designed to withstand predicted flows.

    Constructed horizontal restrictors, which reduced the spillway width from 60 feet to 43 feet.

    Rock excavation by mechanical (non-explosive) methods.

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYProject DescriptionProject Description

    Brandy Keg Dike

    Raised Brandy Keg Dike approximately 3 feet.

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYProject DescriptionProject Description

    Relocation of State Route 302

    Design Effort

    State Route 302 was relocated as a result of the construction for the Auxiliary Spillway.

    Design was performed by Fuller Mossbarger Scott & May Engineers with close cooperation by the Kentucky Department of Transportation and the Corps of Engineers.

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYProject DescriptionProject DescriptionAuxiliary Spillway

    Spoil Site

    Spoil Sites

    Excavation for Auxiliary Spillway

    Dam

    • Constructed a 129-foot wide Auxiliary Spillway through bedrock.

    • Relocate State Route 3051 and a portion of State Route 302.

    • SUBJECT OF THIS PRESENTATION

  • One Corps, One Regiment, One Team

    Four Main Topics of DiscussionFour Main Topics of Discussion

    1. Project Description1. Project Description2. Site Geology2. Site Geology3. Rock Cut3. Rock Cut--Slope DesignSlope Design4. Construction Challenges4. Construction Challenges

    Auxiliary Spillway Auxiliary Spillway –– Dewey Lake, KYDewey Lake, KY

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYSite GeologySite GeologyExisting and Field Data

    Geologic Quadrangle Map

    Coal Mine Adits

    Auxiliary Spillway

    Joint Measurements from Outcrops

    Coal Mine Adit

    Original SR 3051

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYSite GeologySite GeologyExploratory Drilling

    Boring Location Plan

    • 2 Angled Borings to Obtain Discontinuity Orientations

    Proposed SpillwayFloor & Center Line

    • 2 4-inch Diameter Core Borings, Pressure Tested at Sill Location • 4 Borings for Highway Relocation

    • Total of 17 Borings (15 2-inch diameter borings)

    Small Coal Mine Adits

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYSite GeologySite Geology

    Lithology

    700

    800

    900

    PEN

    NSY

    LVAN

    IAN

    AG

    EBR

    EATH

    ITT

    FO

    RM

    ATIO

    N

    Elev. 650

    850

    750

    Geologic Column

    WEATHERED SHALE AND CLAYSTONE: reddish brown to dark gray, soft, clayey, occasionally broken or weathered.

    Low percentage of core recovery (30 -90).

    Low RQD (30 – 75).

    Core Sample

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYSite GeologySite Geology

    Lithology

    700

    800

    900

    PEN

    NSY

    LVAN

    IAN

    AG

    EBR

    EATH

    ITT

    FO

    RM

    ATIO

    N

    Elev. 650

    850

    750

    Geologic Column Core Sample

    SHALE with interbedded siltstone: gray to dark gray, soft to moderately hard.

    High percentage of core recovery (90–100).

    Medium range RQD (65 – 85)

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYSite GeologySite Geology

    Lithology

    700

    800

    900

    PEN

    NSY

    LVAN

    IAN

    AG

    EBR

    EATH

    ITT

    FO

    RM

    ATIO

    N

    Elev. 650

    850

    750

    Geologic Column Core Sample

    SANDSTONE: light gray, moderately hard, fine to medium grained, micaceous.

    High percentage of core recovery (95 –100).

    Good RQD (95 - 100)

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    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYSite GeologySite Geology

    Lithology

    700

    800

    900

    PEN

    NSY

    LVAN

    IAN

    AG

    EBR

    EATH

    ITT

    FO

    RM

    ATIO

    N

    Elev. 650

    850

    750

    Geologic Column Core Sample

    COAL SEAMS: black, moderately hard, slightly to severely broken.

    0.8’ to 2.7’ thick.

    Core loss common.

    Poor RQD

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYSite GeologySite Geology

    Geologic Cross Sections

    Geologic Cross Section Location Plan

    Proposed SpillwayFloor & Center Line

    Sill LocationStation 15+33

    Upstream of SillStation 13+00Downstream of Sill

    Station 19+00

    Flow

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYSite GeologySite Geology

    2+00 1+00 2+001+00CL

    700

    3+00

    800

    900 900

    800

    700

    Geologic Cross Section

    Station 15+33 – Spillway Crest

    C-91-9

    C-91-7

    C-91-6C-91-8

    C-91-5

    SOILSHALE & SILTSTONESANDSTONECOAL SEAM

    South/Left North/Right

    WEATHERED SH & CLS

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    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYSite GeologySite Geology

    2+00 1+00 2+001+00CL

    700

    800

    900 900

    800

    700

    Station 13+00 (Upstream of Sill)

    SOILSHALE & SILTSTONESANDSTONECOAL SEAM

    South/Left North/Right

    C-91-4 C-91-3C-91-2

    Geologic Cross Section

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYSite GeologySite Geology

    2+00 1+00 2+001+00CL

    700

    800

    900 900

    800

    700

    Geologic Section - Station 19+00 (Downstream of Sill)

    SOILSHALE & SILTSTONESANDSTONECOAL SEAM

    South/Left North/Right

    C-91-12C-91-11 C-91-10

    Geologic Cross Section

  • One Corps, One Regiment, One Team

    Four Main Topics of DiscussionFour Main Topics of Discussion

    1. Project Description1. Project Description2. Site Geology2. Site Geology3. Rock Cut3. Rock Cut--Slope DesignSlope Design4. Construction Challenges4. Construction Challenges

    Auxiliary Spillway Auxiliary Spillway –– Dewey Lake, KYDewey Lake, KY

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

    Rock Cut Slope Design Topics

    1. Bench and Slope Design1. Bench and Slope Design

    2. Wedge/Block Analysis2. Wedge/Block Analysis

    3. Rock Fall Analysis3. Rock Fall Analysis

    4. Spillway Sill Design4. Spillway Sill Design

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope DesignBench and Slope Design

    Relatively flat-lying sedimentary rock, with interbedded lithologies that have varying resistance to weathering and high angled joints.

    The cut slope design needs to minimize the effects of differential weathering to reduce wedge/block failures and rock fall hazards.

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

    2+00 1+00 2+001+00CL

    700

    3+00

    800

    900 900

    800

    700

    34

    18’ Bench at Elev. 800 on Coal Seam

    4

    12

    12

    1 18’ Bench at Base of Sandstone

    18’ Bench on Coal Seam

    SR 3051 & Spillway Crest Elev. 866

    Spillway Sill Foundation Elev. 688

    Bench and Slope Design

    Geologic Section - Station 15+33 – Spillway Crest

    SOILSHALE & SILTSTONESANDSTONECOAL SEAM

    South/Left North/Right

    766 763

    725 722

    WEATHERED SH & CLS

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

    2+00 1+00 2+001+00CL

    700

    800

    900 900

    800

    700

    Geologic Section - Station 13+00 (Upstream of Sill)

    SOILSHALE & SILTSTONESANDSTONECOAL SEAM

    South/Left North/RightBench and Slope Design

    1 18’ Bench at Base of Sandstone4

    720 7171

    2SR 302

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

    2+00 1+00 2+001+00CL

    700

    800

    900 900

    800

    700

    Geologic Section - Station 19+00 (Downstream of Sill)

    SOILSHALE & SILTSTONESANDSTONECOAL SEAM

    South/Left North/RightBench and Slope Design

    14

    701

    18’ Bench at Base of Sandstone

    12

    73018’ Bench on Coal Seam

    12

    SR 3051

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

    Bench and Slope Design

    800

    700

    800

    700

    14+00 16+0012+00 18+00 20+00 22+00

    Limits of Excavation

    Spillway Floor Spillway Sill

    2.4% Slope on Coal Seams2.4% Slope atBase of Sandstone

    3% Slope on Coal Seam

    4V:3H2V:1H

    4V:1H2V:1H 2V:1H

    Elevation View – South/Left Spillway Wall

    800

    700

    800

    700

    14+0016+00 12+0018+0020+0022+00

    West

    Elevation View – North/Right Spillway Wall

    2V:1H

    4V:1H2V:1H

    2V:1H

    Flow

    Flow

    WestEast

    East

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

    Plan View

    Bench and Slope Design

    RelocatedState Route

    3051

    RelocatedState Route

    302

    Limits of Excavation

    Spillway Sill

  • One Corps, One Regiment, One Team

    Wedge/Block Analysis - Four Main Failure Modes

    From Hoek, E. and Bray, J.W. “Rock Slope Engineering” 1981.

    Circular Failure – soil-like failure, unlikely to occur at this project, will not be discussed at this time.

    Planar Failure – common with joints that are parallel to cut-slope some failures may be blast induced

    Wedge Failure – could be detrimental, large volume of rock.

    Toppling Failure – similar results as planar failure, unlikely to occur at this project, will not be discussed at this time.

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

  • One Corps, One Regiment, One Team

    Wedge/Block Analysis - Four Main Failure Modes

    Planar Failure – common with joints that are parallel to cut-slope some failures may be blast induced

    Wedge Failure – could be detrimental, large volume of rock.

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

    Wedge/Block Analysis – Joint Analysis

    Simplified Joint RosetteJoint Rosette

    Joint measurements obtained from outcrops and angled exploratoryborings.Typical joint surface has a planar shape with smooth texture, occasionally iron stained or slightly open.

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

    Wedge/Block Analysis – Joint Analysis

    Stereographic Projection of Joint Measurements – Pole Plot

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

    Wedge/Block Analysis – Joint Analysis

    Stereographic Projection of Joint Measurements – Contoured Plot of Poles

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

    Wedge/Block Analysis – Joint Analysis

    Stereographic Projection of Joint Measurements – Planes Representing Joint Sets

  • One Corps, One Regiment, One Team

    Sandstone Phi Angle = 30

    1/4:1 Slope – North Wall

    Wedge Sliding Zone

    Joint Intersection

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

    Wedge/Block Analysis – Wedge Failure Analysis

    Stereographic Projection of Planes used for Wedge Analysis

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

    Wedge Analysis 1/4:1 Slope South Wall Sandstone

    Wedge Analysis 1/2:1 Slope South Wall

    Shale

    Wedge Analysis 1/4:1 Slope North Wall Sandstone

    Wedge Analysis 1/2:1 Slope North Wall Shale

  • One Corps, One Regiment, One Team

    Sandstone Phi Angle = 30 1/4:1 Slope – North Wall

    Planar Sliding Zone

    Daylight Envelope

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

    Wedge/Block Analysis – Planar Failure

    Stereographic Projection of Poles used for Planar Analysis

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

    Planar Analysis 1/4:1 Slope South Wall Sandstone

    Planar Analysis 1/2:1 Slope South Wall

    Shale

    Planar Analysis 1/4:1 Slope North Wall Sandstone

    Planar Analysis 1/2:1 Slope North Wall Shale

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

    5300.050.870.050.37SLOPES IN SHALE/SILTSTONE

    5250.050.870.050.37SLOPES IN SANDSTONE

    5250.020.850.020.35ALL BENCHES

    std. dev.meanstd. dev.meanstd. dev.mean

    Friction Angle (Phi angle)

    Coefficient of Tangential Restitution

    Coefficient of Normal Restitution

    SURFACE AND MATERIALS

    Rock Fall Analysis – Input ParametersValues are subjective, derived from published tables.

    Computer programs included Colorado Rockfall Simulation and RocFall.

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

    Rock Fall Analysis

    Boulder Origin at Top of Cut Slope

    Boulder Origin

    Boulder Trajectory

    Boulder Origin at Bench Elev. 800

    Boulder Origin

    Boulder Trajectory

    Slope was Redesign

    SR 3051

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

    Rock Fall Analysis

    Boulder Origin at Bench Elev. 766

    Boulder Origin

    Boulder Trajectory

    Boulder Origin at Bench Elev. 725

    Boulder Origin

    Boulder Trajectory

    SR 3051

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

    Plan View

    Spillway Sill

    Spillway Sill Design

    SR 3051

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

    Spillway Sill – Bedrock Parameters

    Cross Section – Spillway Sill – Normal Condition

    150

    160

    pcf

    Unit Weight

    Allowable Bearing Pressure

    32095175501525LOWER SANDSTONE

    90651030025LOWER SHALE

    psipsipsidegreepsidegree

    Anchor Bond

    Strength

    Cross Bed Shear Strength

    phi c

    Sliding Friction Strength

    phi cLITHOLOGIC

    MEMBER

    Lower Shale Member

    Lower Sandstone Member

    Flow

    EL. 676

    EL. 678

    Crest EL. 688Concrete Spillway Sill690

    680

    670

    660

    690

    680

    670

    66037’ Long, 1¼” Diameter

    Threadbar Anchor, Tensioned to 112 kips

    4” Diameter Hole

    700

    710

    700

    710

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

    Spillway Sill Design – Headcut Erosion

    Cross Section – Spillway Sill – Flood Condition

    Lower Shale Member

    Lower Sandstone Member

    Flow

    Rock Anchor

    EL. 676

    Spillway Sill Crest EL. 688690

    680

    670

    660

    690

    680

    670

    660

    700

    710

    700

    710

    10’ Shale Removed by Headcut Erosion

    Flood Crest EL. 708

    2’ Erosion of Shale U/SEL. 686

    EL. 678

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYRock Cut Slope DesignRock Cut Slope Design

    Spillway Sill Design

  • One Corps, One Regiment, One Team

    Four Main Topics of DiscussionFour Main Topics of Discussion

    1. Project Description1. Project Description2. Site Geology2. Site Geology3. Rock Cut3. Rock Cut--Slope DesignSlope Design4. Construction Challenges4. Construction Challenges

    Auxiliary Spillway Auxiliary Spillway –– Dewey Lake, KYDewey Lake, KY

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYConstruction ChallengesConstruction ChallengesConstruction Contract

    • PRIME CONTRACTOR: Tab Construction Co. of Canton, Ohio

    • DRILLING AND BLASTING SUBCONTRACTOR: Hilltop Energy Inc. of Mineral City, Ohio

    • CONSTRUCTION DURATION: Approximately Two Years from August 2000 to September 2002.

    • FINAL EXCAVATION QUANTITIES: Rock Excavation: 677,000 cubic yards Structural (Rock/Concrete) Excavation: 1,000 cubic yards Common (Soil) Excavation: 306,000 cubic yards

    • FINAL CONSTRUCTION CONTRACT COST: $12.8 Million Dollars

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYConstruction ChallengesConstruction Challenges

    Modifying Rock-Cut Slopes

    Removal of Slip-Prone Soil Initial Rock Cut

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYConstruction ChallengesConstruction Challenges

    Blasting Vibration Control

    Location of Homes

    Blasting for Auxiliary Spillway

    SR 3051 & 302

    Perched Boulders

    Homes

    Blasting Within 790 Feet of Boulders and 1,000 Feet From Homes

    Restricted Peak Particle Velocity to 1.5 in/sec at 200 Feet From Blast

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYConstruction ChallengesConstruction Challenges

    Blasting Vibration Control

    Large Boulders Located on Ridge Line and Perched Above Homes

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYConstruction ChallengesConstruction ChallengesDrilling And Blasting

    Pre-Split Drilling 18” to 30” Center to Center Loading Production Shot

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYConstruction ChallengesConstruction Challenges

    Drilling And Blasting

    Production Blast Production Blast

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYConstruction ChallengesConstruction ChallengesExcavation and Spoil Sites

    Rock Excavation Spoil Sites

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYConstruction ChallengesConstruction Challenges

    Maintaining Traffic and Utilities During Excavation

    View of South/Left Spillway Wall Spillway Sill

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYConstruction ChallengesConstruction Challenges

    Eliminated Upper Rock Anchor

    Recessed Concrete

    Low Strength Concrete

    Modifications to Correct for Future Erosion of Shale

    Over Excavation of Spillway Sidewalls

    Spillway Sill

    SR 3051

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYConstruction ChallengesConstruction Challenges

    Final Product

    South/Left Spillway Wall as Viewed from Upstream

    North/Right Spillway Wall as Viewed from Upstream

  • One Corps, One Regiment, One Team

    Auxiliary Spillway Auxiliary Spillway –– Dewey Dam, KYDewey Dam, KYConstruction ChallengesConstruction ChallengesFinal Product

    Upstream of Spillway Route 302 Transition

    Auxiliary Spillway Viewed from Downstream

    Relocated SR 302

    Relocated SR 3051

  • One Corps, One Regiment, One Team

    Questions & DiscussionQuestions & Discussion

    Contact Information: Contact Information: Michael Nield Michael Nield Phone: (304) 529Phone: (304) 529--5056 5056 EE--mail: [email protected] mail: [email protected]

    Auxiliary Spillway Auxiliary Spillway –– Dewey Lake, KYDewey Lake, KY