FDOT Standard Plans Index 548-020: MSE Retaining Wall Systems -Permanent

Design Criteria

Design Criteria AASHTO LRFD Bridge Design Specifications ; Structures Design Guidelines ( SDG ) ; AASHTO-AGC-ARTBA Task Force 27 (Ground Modification Techniques), Insitu Soil Improvement Techniques , January 1990.

Design Assumptions and Limitations

Design Assumptions and Limitations 1. It is the responsibility of the Engineer of Record to determine that the maximum factored bearing pressure shown for the wall does not exceed the factored bearing resistance of the foundation for that specific wall location. 2.

The wall Company is responsible for the internal stability of the wall. External stability design, including foundation and slope stability, is the responsibility of the Engineer of Record. 3.

If there are manholes and/or drop inlets present, design and analysis for both internal and external stability shall be considered. See SDG Chapter 3 for more details. 4.

When a slope is necessary at the base of the front face of the retaining wall, and a flat area meeting the requirements of FDM 215.2.6 (10'-0" Min.) cannot be provided, then the flat area can be reduced up to a minimum of 4'-0".

Payment

Payment Item number Item Description Unit Measure 548-12 Retaining Wall System, Permanent, Excluding Barrier SF 548-14 Retaining Wall System, Permanent - Widening, Attached To Existing Wall SF 459-71 Polyethylene Sheeting on Concrete Piling SY

Commentary

Commentary: See Standard Plans Instructions for Index 521-600 Series for Traffic Railing/Junction Slab Pay Items as required.

What your plans must show

Plan Content Requirements for this index — the SPI's checklist for designers.

• In the Structures or Roadway Plans: Prepare Wall Control Drawings and related drawings as specified in SDM Chapter 19 and FDM 262, and include them in the plans. Complete the following Data Tables using the following instructions and include the Data Tables on the retaining wall supplemental detail sheets. See FDM 115 for more information regarding use of Data Tables.
• 1. Complete the Notes and add/modify/delete as necessary.
• 2. List each wall in Note 3 separately, showing applicable wall systems.
• 3. Complete the "Geotechnical Information" table based on project soil conditions. See SDG Chapter 3 for required design based internal friction angle and unit weight of Reinforced Soil and Random Backfill.
• 4. Complete the "Retaining Wall Variables" and "Soil Reinforcement Lengths for External Stability" tables based on project requirements. If the Design High Water Elevation (DHW) is above the adjacent ground surface, include the elevation in the "Retaining Wall Variables" table. Otherwise include "N/A" in the appropriate column in the table. DHW refers to the controlling water elevation adjacent to the wall. See SDG 3.13.2. The Wall Heights in the "Soil Reinforcement Lengths for External
• Standard Plan s Instructions Topic No. 625
• - 020 MSE Retaining Wall Systems
• - Permanent Stability" table refer to the height above the leveling pad, measured to the top of the wall coping. See SDG Chapter 3 Figures for details.
• 5. Transverse Differential Settlement is only applicable for widening of existing embankments.
• 6. Include the pay item for Polyethylene Sheeting on Concrete Piles per Specification Section 459 (to minimize downdrag) for all piles and drilled shafts that are located within the wall limits.
• Standard Plan s Instructions Topic No. 625
• - 020 MSE Retaining Wall Systems
• - Permanent Standard Plan s Instructions Topic No. 625
• - 020 MSE Retaining Wall Systems