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FILL TYPE RETAINING WALLS. EI 10-031 EB 10-041 EB 10-042. Based on how they work:. Externally Stabilized. Internally Stabilized. Soil particle at interface with back of structural facing. Overview: Wall Categories. Based on how they are constructed

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fill type retaining walls

FILL TYPE RETAINING WALLS

  • EI 10-031
  • EB 10-041
  • EB 10-042
overview wall categories

Based on how they work:

Externally Stabilized

Internally Stabilized

Soil particle at interface with

back of structural facing

Overview: Wall Categories
overview wall categories3

Based on how they are constructed

        • Cut Walls: Wall is constructed “top-down”.
Overview: Wall Categories
overview wall categories5

Highway Design Manual

      • Table 9-6 Classification of Retaining Wall Systems
Overview: Wall Categories
background proprietary wall systems

Proprietary walls - Vendor designed systems protected by specific patents.

  • Proprietary systems can only be used on State projects as follows:
    • Chosen by competitive bid
    • No suitable alternative
      • Synchronization: One item only fits in a series of items, or it is part of a system
      • Provides a unique function
    • Experimental feature: Requires an approved Experimental Work Plan
    • Public Interest – needs project-by-project approval
Background: Proprietary Wall Systems
background proprietary wall systems7

These rules apply to any project with Federal money

(incl. Pass-Thru projects & federally funded maintenance projects).

  • Proprietary items are submitted at PS&E (with supporting documentation and justification to FHWA)
  • A bid proposal with an item not on the AL could be declared “nonresponsive”
  • Approved List’s with less than 3 systems require justification.
Background:Proprietary Wall Systems
background proprietary wall systems8

Four Proprietary Fill Type Retaining Wall Categories:

      • Mechanically Stabilized Earth System
      • Mechanically Stabilized Segmental Block Retaining Wall System
      • Precast Modular Wall System
      • Segmental Block Retaining Wall System
  • Approved List
Background: Proprietary Wall Systems
merge existing specifications

Section 554

  • Section 632
  • SBRWS Special
  • Materials
  • Bureau Testing
  • Issue
  • Section 554 Fill Type Retaining Walls
Merge Existing Specifications
side issue testing blocks

Wet-Cast Products

    • Manufactured & shipped to job site in a matter of days.
    • Based on performance criteria thru NYSDOT administered QC/QA program.
        • Historical data of test results.
        • Sampling and testing audit operations.
  • Dry-Cast Products
    • Manufactured in lots.
    • Quarantined for sampling and freeze-thaw testing.
    • Delayed from shipping until acceptable test results.
  • Fairness in Testing Procedures
Side Issue: Testing Blocks

Materials Procedure MP 09-03:

Concrete Masonry Unit QA/QC Procedures

overview definitions of terms

Wall System

    • Face units are the

structural support.

  • Internally Stabilized

Wall System

    • Reinforcement added to

a “wall system” to increase

achievable wall heights.

  • Internally Stabilized

Earth System

    • Reinforcement is the structural support.
    • Face panels alone could not be a “wall system”.
Overview: Definitions of Terms
overview definitions of terms13

Fill Type Retaining Walls

  • Prefabricated Wall System
            • Open Top Face
    • Solid Face
  • Mechanically Stabilized Wall System
    • “Reinforced Prefabricated Wall Systems”
  • Mechanically Stabilized Earth System
Overview: Definitions of Terms
new issuances

Construction

    • Standard Sheets
  • M554-1 (554.01 Sheet 1 of 5) Proprietary Fill Type Retaining Walls (General Notes)
  • M554-2 (554.01 Sheet 2 of 5) Proprietary Fill Type Retaining Walls (General Details)
  • M554-3 (554.01 Sheet 3 of 5) Proprietary Fill Type Retaining Walls (Typical Sections for MSES)
  • M554-4 (554.01 Sheet 4 of 5) Proprietary Fill Type Retaining Walls (Typical Sections for MSWS)
  • M554-5 (554.01 Sheet 5 of 5) Proprietary Fill Type Retaining Walls (Typical Sections for PWS)
  • M554-6 (554.02 Sheet 1 of 6) Geosynthetically Reinforced Soil Systems (Walls-General Notes and Details)
  • M554-7 (554.02 Sheet 2 of 6) Geosynthetically Reinforced Soil Systems (Walls-Typical Sections)
  • M554-8 (554.02 Sheet 3 of 6) Geosynthetically Reinforced Soil Systems (Slopes-General Notes and Details)
  • M554-9 (554.02 Sheet 4 of 6) Geosynthetically Reinforced Soil Systems (Slopes-Typical Sections)
  • M554-10 (554.02 Sheet 5 of 6) Geosynthetically Reinforced Soil Systems (Facing Details)
  • M554-11 (554.02 Sheet 6 of 6) Geosynthetically Reinforced Soil Systems (Facing Details)
  • Design
    • HDM Revision No. 60 (Chapter 9)
      • Section 9.4 Retaining Walls and Reinforced Soil Slopes
  • EB 10-041
  • EB 10-042
New Issuances
new issuances15

Design

    • GRSS Specification
        • Item 554.30XX Geosynthetically Reinforced Soil System Wall
        • Item 554.31 Geosynthetically Reinforced Soil System Slope
    • Fill Type Retaining Wall Specification
        • Item 554.40 Fill Type Retaining Wall (0-1 m)
        • Item 554.41 Fill Type Retaining Wall (Greater than 1 m – 1.8 m)
        • Item 554.42 Fill Type Retaining Wall (Greater than 1.8 m – 2.7 m)
        • Item 554.43 Fill Type Retaining Wall (Greater than 2.7 m – 3.7 m)
        • Item 554.44 Fill Type Retaining Wall (Greater than 3.7 m – 4.6 m)
        • Item 554.45 Fill Type Retaining Wall (Greater than 4.6 m)
    • Fill Type Retaining Wall Aesthetic Specification
  • Item 554.5001 Fill Type Retaining Wall Aesthetic Treatment – Textured Surface (Hand Tooled, Raked, etc.), No Color
  • Item 554.5002 Fill Type Retaining Wall Aesthetic Treatment – Textured Surface (Hand Tooled, Raked, etc.), Integral Color
  • Item 554.5101 Fill Type Retaining Wall Aesthetic Treatment – Exposed Aggregate Finish, No Color
  • Item 554.5102 Fill Type Retaining Wall Aesthetic Treatment – Exposed Aggregate Finish, Integral Color
  • Item 554.5201 Fill Type Retaining Wall Aesthetic Treatment – Architectural Pattern, No Color
  • Item 554.5202 Fill Type Retaining Wall Aesthetic Treatment – Architectural Pattern, Integral Color
  • Item 554.53 Fill Type Retaining Wall Aesthetic Treatment – Other; As shown in the Contract Documents
  • EI 10-031
New Issuances
aesthetics

Default PWS

  • (open top face units):
  • Plain, smooth concrete finish
  • Natural concrete (gray) color
  • Default PWS
  • (solid face units):
  • Split face finish
  • Natural concrete (gray) color
  • Default MSES:
  • Plain, smooth concrete finish
  • Natural concrete (gray) color
Aesthetics
aesthetics17

Precast Panels or

PWS (Open Top Face Units)

PWS

(Solid Face Units)

Textured Surface

Exposed Aggregate Finish

Aesthetics

Architectural Pattern

expanded approved list

Master

List

Design Assumptions

Drycast Concrete Wall Units

Hyperlink

Hyperlink

Prefabricated Wall Systems

&

Mechanically Stabilized Wall Systems

Mechanically Stabilized Earth Systems

Hyperlink

Hyperlink

Precast Concrete Panel Units

Precast Concrete Wall Units

Expanded Approved List
expanded approved list19

20 wall systems competitively bid against each other

  • Don’t Eliminate – Enumerate!

Use Special Notes:

EX. Notes for Use with Fill Type Retaining Walls in Underwater Applications:

1. The Design High Water at elevation ___ is above the bottom of wall elevation.

2. If metallic elements are used, provide additional corrosive protection to account for fluctuating water conditions throughout a 75-year design life.

3. If soil reinforcing elements are used, provide certification by a NYS PE that the design accounts for the reduced resisting soil pressures under buoyant conditions.

4. For any wall type, provide certification by a NYS PE that the wall will be stable under buoyant conditions.

5. If ice contact is expected, ensure the durability of the wall to withstand such forces.

6. Provide adequate prevention of the migration of soil through wall joints.

7. Provide weep holes with inverts no more than 4” above OHW elevation and 1 ft thickness of free-draining material between OHW and DHW elevations for the prevention of hydrostatic pressure build up behind the wall due to drawdown conditions.

Expanded Approved List
example approved list master list mses portion

Wall System

Reinforced Height Range

Abutment Applications

Hyperlinks

Example Approved List: Master List (MSES Portion)

Hyperlinks

example approved list master list pws msws portion

Wall System

Reinforced Height Range

Abutment Applications

Hyperlinks

Hyperlinks

Example Approved List: Master List (PWS & MSWS Portion)
design procedure

Designer Determines Need for Fill Wall

GEB Provides Design Details

Yes

GRSS Wall?

Design Elements and Specifications incorporated into Contract Documents

Need for Additional Aesthetic Treatment?

No

No

Lines, Grades, Elevations, and Special Notes Shown in Contract Documents.

  • Vividly Describe Aesthetic Treatments
  • Industry-Standard Descriptions (Color, Texture, Pattern)
  • Special Notes
  • Special Details

Yes

Design Procedure
construction process

Plans Depict

Fill Wall

Plans Depict GRSS Wall

Contractor Chooses Wall System from Approved List

Contractor Submits Design and Details of Proprietary System

Contractor Submits Geosynthetic Certifications

Submittal Approval

No Change in Process

Construction Process

Wall Construction

conclusion

Merging the specifications does several things:

      • Conformance with Competitive Bidding, provided under 23 CFR 635.411(a)(1) by identifying as many acceptable products as possible.
      • Separates the cost of the wall function from the cost of the wall aesthetics.
      • Eliminates bias in selection of wall type.
      • Eliminates the State losing potential cost savings to VE proposals.
      • Eliminates the problem of the designer sometimes specifying proprietary wall systems, and then needing a spec and a “back-justification”.
  • Where special requirements warrant, create and justify a special spec.
Conclusion
conclusion25

No change in the basic role of the RGE.

    • In lieu of selecting a single wall type, describe the conditions, requirements and limitations of the site on the plans.
  • More onus on the RLA.
    • Need to vividly describe the desired aesthetic treatment on the plans using generic terms.
  • Project Managers need to broaden their presentations of wall types
    • Need to become familiar with the available categories (textured surface, exposed aggregate finish, architectural pattern) for presentations to communities. While negotiating a “look”, the PM should avoid promising the use of a specific type of wall.
Conclusion