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Advancements in the Design of Articulated Concrete Block Mats

Advancements in the Design of Articulated Concrete Block Mats. Joe Kerrigan, P.E . (CO) Basalite Concrete Products LLC. Action Items for TODAY. During this presentation we will introduce: National Concrete Masonry Association (NCMA) Articulated Concrete Block Mat (ACBM) design manual.

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Advancements in the Design of Articulated Concrete Block Mats

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  1. Advancements in the Design of Articulated Concrete Block Mats Joe Kerrigan, P.E. (CO) Basalite Concrete Products LLC

  2. Action Items for TODAY • During this presentation we will introduce: • National Concrete Masonry Association (NCMA) Articulated Concrete Block Mat (ACBM) design manual. • Review Factor of Safety method of design and provide design spreadsheets for analysis and design of these systems

  3. Goals for TODAY • Show How these approaches can add value to your projects • Show How these are cost effective approaches

  4. Articulated Concrete Block Mats Submar

  5. Erosion takes place when the flow conditions exceed the limits of natural vegetation

  6. Erosion over time can be extremely hazardous

  7. Erosion carves away at the earth’s surface over time

  8. Bridge Collapse due to Scour

  9. Abutment Degradation

  10. Bridge Sections Collapsing

  11. Traditional Methods of Erosion Control

  12. Erosion Control Issue Low Level High Level Low Velocity High Velocity (ft/s) The Performance Pyramid

  13. Components of the Ultra Flex System

  14. Cable Sleeves Blocks Ultra Flex System Components Washers Ultra Flex System Components

  15. Up to 8’ Up to 40’ The Ultra Flex System…virtually any size you want

  16. Open Cell Blocks for applications where vegetation is desired Closed Cell Blocks for applications where you may not want as much vegetation The Ultra Flex System…for vegetation or minimal vegetation

  17. Unit Production

  18. ASTM for Unit Manufacturing

  19. Mattress Fabrication

  20. Loading of the Mattress

  21. Place and Lace When ACCESS MATTERS

  22. The Basics of Ultra Flex Design

  23. Channelized Flow Scenario Wave-Attack Scenario Overtopping Flow Scenario Understanding the Design Hydraulic Conditions

  24. The Factor-of-Safety Methodology for ACB’s • "Erosion and Sedimentation" by Pierre Julien, Cambridge University Press, 1995” • SF = ((2 / 1) ) / ((1 - 2)0.5 cos  +  (2 / 1) + (3 Fd’ cos  + 4 Fl’) / 1Ws) When one block loses intimate contact with the underlying subgrade…this will constitute a system failure. Factor-of-Safety Methodology

  25. 1 Block Overtopping Tests Flume Setup 2 3 It all starts with Hydraulic Testing

  26. Block Overtopping Tests Data Acquisition It all starts with Hydraulic Testing

  27. Block and Geotextile is Removed Shear Stress Can Be Calculated L1,L2, L3 and L4 (inches or mm) Critical Sear Stress is determined from this testing and can be used to determine the shear stress from thicker units

  28. Flow Fi FL FD FG1 FG2 FR Destabilizing Forces Fi = Impact force (projecting block) FL = Lift Force FD = Drag Force FG1 = Gravity force parallel to slope Stabilizing Forces FR = Interblock resistance FG2 = Gravity force normal to slope Destabilizing vs. Stabilizing Forces

  29. Picking the “Right” Unit given the Factor-of-Safety Methodology

  30. 4.5 inches 6.0 inches 9.0 inches System Performance Increases as the Unit Weight (Thickness) Increases Variety of Thicknesses

  31. Army Corp of Engineers CHANLPRO Rip Rap Design Software

  32. Channel and Hydraulic Input Parameters

  33. Resulting Rock Size, Weight, and Layer Thickness

  34. Block data Channel data Given the Same Channel and Hydraulic Input Parameters

  35. Riprap • D50 Weight = 863 lbs • D50 Diameter = 28 in • Layer Thickness = 60 in ACB/M 6” Unit And the Winner Is…

  36. Action Items for this information • NCMA Manual and Design Spreadsheets • Please contact Joe Kerrigan at joseph.kerrigan@paccoast.com • Please include your name • Physical Address and e-mail address

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