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1807.2 Retaining Walls
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Retaining walls shall be designed to ensure stability against overturning, sliding, excessive foundation pressure and water uplift.
Retaining walls shall be designed for the lateral soil loads set forth in Section 1610. For structures assigned to Seismic Design Category D, E, or F, the design of retaining walls supporting more than 6 feet (1829 mm) of backfill height shall incorporate the additional seismic lateral earth pressure in accordance with the geotechnical investigation where required in Section 1803.2.
Retaining walls shall be designed to resist the lateral action of soil to produce sliding and overturning with a minimum safety factor of 1.5 in each case. The load combinations of Section 1605 shall not apply to this requirement. Instead, design shall be based on 0.7 times nominal earthquake loads, 1.0 times other nominal loads, and investigation with one or more of the variable loads set to zero. The safety factor against lateral sliding shall be taken as the available soil resistance at the base of the retaining wall foundation divided by the net lateral force applied to the retaining wall.
Exception: Where earthquake loads are included, the minimum safety factor for retaining wall sliding and overturning shall be 1.1.
Related Code Sections
1807.2 Soils and Foundations, Retaining Walls
Retaining walls shall be designed in accordance with Sections 1807.2.1 through 1807.2.3 ...
Building Code 2018 of Illinois > 18 Soils and Foundations > 1807 Foundation Walls, Retaining Walls and Embedded Posts and Poles > 1807.2 Retaining Walls
2304.12.5 Wood, Wood Used in Retaining Walls and Cribs
Wood installed in retaining or crib walls shall be preservative treated in accordance with AWPA U1 for soil and fresh water use ...
Building Code 2018 of Illinois > 23 Wood > 2304 General Construction Requirements > 2304.12 Protection Against Decay and Termites > 2304.12.5 Wood Used in Retaining Walls and Cribs
1807.3 Soils and Foundations, Embedded Posts and Poles
The design procedures outlined in this section are subject to the following limitations: The frictional resistance for structural walls and slabs ...
Building Code 2018 of Illinois > 18 Soils and Foundations > 1807 Foundation Walls, Retaining Walls and Embedded Posts and Poles > 1807.3 Embedded Posts and Poles
1807.1.1 Soils and Foundations, Design Lateral Soil Loads
Foundation walls shall be designed for the lateral soil loads set forth in Section 1610 ...
Building Code 2018 of Illinois > 18 Soils and Foundations > 1807 Foundation Walls, Retaining Walls and Embedded Posts and Poles > 1807.1 Foundation Walls > 1807.1.1 Design Lateral Soil Loads