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The work described herein summarizes the results of a preliminary study which, when completed, will lead to the development of an improved numerical model for concrete-to-soil interfaces for use in soil-structure interaction analyses. These improvements will extend the accuracy of current interface models to include unload-reload and staged shear interface behavior. Accurate unloadreload concrete-to-soil interface behavior is important to cases involving the partial or complete submergence of a lock and its bacldlll, commonly referred to as a post-construction rise in the groundwater level. The resulting interface numerical model is intended for implementation in the incremental construction soil-structure interaction program SOILSTRUCT.

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