Solution of plastic full-flow steady state large displacement problems using FLAC

S Pinkert, A Klar

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


This paper presents an alternative approach for solving large displacement steadystate full-flow problems using FLAC. The suggested approach involves the unique capability of FLAC to produce reliable velocity fields at the collapse stage. Through change of reference systems, changes with time of soil characteristics may be viewed as spatial distributions (fixed in time). The suggested method utilizes this concept, in which the spatial distribution of strength is determined by converting time changes into a spatial distribution using the governing equation of steady state flow. The method treats the domain as continuous with the associated field equations, and employs an upstream weighting technique to allow a "local solution scheme". The execution order of the calculation is based on topological ordering, which leads to complexity of O(N), compared with O(N
1.5) for the streamline methods (where N is the number of zones). Details on the implementation of the method in FLAC using FISH are presented in the paper. The method is demonstrated for the problems of in-situ T-bar penetration and lateral buckling of offshore buried pipelines.
Original languageEnglish GB
Title of host publicationProceedings of the 2nd International FLAC/DEM Symposium
StatePublished - 2013


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