PB Slide Template - Caltrans - California Department of PDF/Lesson 6 rev 2013-06-24Apply Wedge...

download PB Slide Template - Caltrans - California Department of PDF/Lesson 6 rev 2013-06-24Apply Wedge Stability Conditions to Rock Slope Design for Highways. 6-3 ... Analysis of Wedge Failure

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Transcript of PB Slide Template - Caltrans - California Department of PDF/Lesson 6 rev 2013-06-24Apply Wedge...

  • 6-1

    WEDGE FAILURE

    Lesson 6

  • 6-2

    LESSON 6 - WEDGE FAILURE

    Learning Outcomes -

    Identify Geometric Conditions for Wedge

    Failure;

    Analyze for Wedge Failure using Design Chart;

    Apply Wedge Stability Conditions to Rock

    Slope Design for Highways.

  • 6-3

    Wedge failure in very

    strong granite with

    widely spaced joints

    (Upstate New York)

  • 6-4

    Wedge formed by

    bedding and

    orthogonal joints

    in sandstone

    (US60, Globe, AZ)

    Joints

    Bedding

  • 6-5

    Conditions for Wedge Failure

    Two Intersecting Planes Behind Face

    Line of Intersection Daylights on Face

    Line of Intersection Dips >

  • 6-6

    Wedge Failure Geometry

    Flatter of the two

    sliding planes is

    Plane A

    Plane A Plane B

    Line of intersection

  • 6-7

    Stereoplot of Wedge Failure Geometry

    Direction of sliding

    Plane A Plane B

    Friction cone Slope face

  • 6-8

    Analysis of Wedge Failure

    Factor of Safety F, for Friction only

    ForcesDisplacing

    ForcesistingReF

    i

    BA

    sinW

    tan)RR(F

    (6-1)

  • 6-9

    Wedge Stability Charts for Friction Only

    Factor of Safety

    Plane A is Flatter of Two Sliding Planes

    BA tanBtanAF

  • 6-10

    Wedge Stability Chart A

  • 6-11

    Wedge Stability Chart B

  • 6-12

    Student Exercise Wedge Stability Analysis

    Student Exercises No. 1B and No. 5

  • 6-13

    Wedge failure in

    sandstone with

    orthogonal jointing

    (Ankara, Turkey)

  • 6-14

    Wedge failure in shale with orthogonal

    jointing; tension on right side (Helena, MT)

  • 6-15

    Potential wedges formed by

    discontinuous joints (US23, Flag Pond, TN)

  • 6-16

    Analysis of Wedge Failure

  • 6-17

    Stability Analysis of Wedge using SWEDGE

  • 6-18

    SWEDGE analysis showing wedge geometry (red),

    water forces (blue) and external force (purple).

  • 6-19

    Wedge formed by

    five planes (I-5, Grants Pass, OR)

    LOI

    1: Plane A

    2: Plane B

    3: Upper slope

    4: Face

    5: Tension crack

  • 6-20

    Wedges

    Planar

    slides

  • 6-21

    Plane failure on bedding

  • 6-22

    Wedges formed

    by bedding and

    joints

  • 6-23

    LESSON 6 - WEDGE FAILURE

    Learning Outcomes -

    Identify Geometric Conditions for Wedge

    Failure;

    Analyze for Wedge Failure using Design Chart;

    Apply Wedge Stability Conditions to Rock

    Slope Design for Highways.