The requirements of EC7 are not always easy tounderstand or implement and in practice one encounters a variety of interpretations. This allows the user to investigate both Ultimate and Serviceability Limit States.Separate data sets (SLS and ULS parameters) are required to fully investigate the two limit states.The purpose of this note is to summarise the requirements of EC7 as they relate to embedded retainingwalls and the use of WALLAP in their design. It remains to be seen whether all or part of the design process will be automated infuture.WALLAP carries out Limit Equilibrium and Linear Elastic-Plastic analyses at each stage of theconstruction sequence. For the time being the assistance provided in WALLAP will be restricted to thefollowing advice. There are no automatic features for introducingpartial factors although WALLAP does have a convenient method for factoring the strength and stiffnessgroups of soil properties. DRAFT 21.10.09The use of WALLAP in the context of Eurocode 7(EN 1997-1, Eurocode 7:Geotechnical Design)WALLAP allows you considerable freedom to follow the design requirements of Eurocode 7 (EC7) andmany other codes of practice.As things stand at present (WALLAP version 5.04), it is up to the user to select appropriate soilproperties, excavation levels, surcharges and water pressures for the various different cases - short andlong term conditions, load combinations, ULS and SLS.
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