Computation of Retaining Structures in Steep Slopes by Reducing M-C Strength Parameters to Failure

Parallel to a Benchmark problem for the FEM Strength Reduction Method by the German Geotechnical Society (DGGT), since 2015 a methodology for FEM analysis in steep slopes has been developed. It consists of three base practices, i.e., (1) finding a suitable primary stress state without excessive plastic zones; (2) simulating the erection of existing structures in the slope to derive the initial state ‘as-built’; and (3) establishing a consistent concept for the analysis of deterioration, for checking ultimate limit states including seismic acceleration, and for designing rehabilitation measures in compliance with partial-safety design codes. The result is a numerical model which can serve as digital twin to study the effect of different rehabilitation measures, including prestressed ground anchors. While the application to soil-structure interaction of concrete retaining walls is demonstrated, it may be applied likewise to reinforced earth structures.