- Title
- Adaptive finite element limit analysis incorporating steady state pore pressures
- Creator
- Sloan, Scott W.; Lyamin, Andrei V.; Krabbenhøft, Kristian
- Relation
- International Conference on Computational Methods for Coupled Problems and Engineering. Proceedings of 5th International Conference on Computational Methods for Coupled Problems in Science and Engineering (Ibiza, Spain 17-19 June, 2013) p. 744-755
- Relation
- http://congress.cimne.com/coupled2013/proceedings/
- Publisher
- International Center for Numerical Methods in Engineering (CIMNE)
- Resource Type
- conference paper
- Date
- 2013
- Description
- This paper describes an adaptive method for incorporating the pore pressures associated with steady-state seepage in finite element limit analysis. The formulation can model both general seepage conditions, and locating the phreatic surface in unconfined flow presents no special difficulty [1]. Since the proposed method employs the same mesh for the upper analysis, the lower-bound analysis and the pore pressure computation, there is no need to import and interpolate the pore-pressures from another grid (or program). This is a significant practical advantage and leads to an efficient solution process. In the iterative solution method, a Hessian(curvature)-based error estimator is applied to the pore pressure field to generate a mesh which gives accurate pore pressures. Simultaneously, a variant of the ‘bounds gap’ error estimator of [2],[3] is employed to identify a separate mesh which gives accurate upper and lower bounds on the limit load. By combining these two strategies, a hybrid refinement strategy is developed which minimises both the bounds gap and the error in the computed pore pressures.
- Subject
- finite element; limit analysis; pore pressures; coupled problems
- Identifier
- http://hdl.handle.net/1959.13/1061028
- Identifier
- uon:16861
- Identifier
- ISBN:9788494140761
- Language
- eng
- Full Text
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