November 1, 2018

Best Practices for Zero Retaining Wall Failures - Internal Compound Stability Calculations

Internal Compound Stability (ICS) calculations determine the factors of safety for potential slip surfaces which pass through the unreinforced retained soil, the reinforced soil mass and the wall facing within the wall design envelope.  ICS calculations provide insight into potential global or overall stability issues. When more than 50% of the slip arcs originate at the back of the design envelope, as defined in Chapter 1, Section 1.9 b, a full global/overall stability analysis should be recommended to the owner by the owner’s geotechnical engineer.  (ref. BP, Chapter 8.6)

Allan Block is working to achieve our industry initiative of Zero Wall Failures. With our Best Practices Manual and experience in the industry we are trying to expand the knowledge base for the design of segmental retaining walls (SRW's) by communicating and educating the professionals in the industry.  To see the full Best Practices Manual, visit to download today and keep an eye out for more industry Best Practice recommendations here.

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