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Applying bi-directional evolutionary structural optimisation method for tunnel reinforcement design considering nonlinear material behaviour
journal contribution
posted on 2014-01-01, 00:00 authored by T Nguyen, Kazem GhabraieKazem Ghabraie, T Tran-CongIn the empirical methods for reinforcement design of underground excavations, an even distribution of rock bolts is generally recommended. This work proves that this design is not necessarily optimal and shows how the state-of-the-art reinforcement design could be improved through topology optimisation techniques. The Bidirectional Evolutionary Structural Optimisation (BESO) method has been extended to consider nonlinear material behaviour. An elastic perfectly-plastic Mohr-Coulomb model is utilised for both original rock and reinforced rock. External work along the tunnel wall is considered as the objective function. Various in situ stress conditions with different horizontal stress ratios and different geostatic stress magnitudes are investigated through several examples. The outcomes show that the proposed approach is capable of improving tunnel reinforcement design. Also, significant difference in optimal reinforcement distribution for the cases of linear and nonlinear analysis results proves the importance of the influence of realistic nonlinear material properties on the final outcome.
History
Journal
Computers and geotechnicsVolume
55Pagination
57 - 66Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0266-352XLanguage
engPublication classification
C1.1 Refereed article in a scholarly journal; C Journal articleCopyright notice
2013, ElsevierUsage metrics
Categories
No categories selectedKeywords
topology optimisationBESO methodnonlinear material behaviourtunnel reinforcementScience & TechnologyTechnologyPhysical SciencesComputer Science, Interdisciplinary ApplicationsEngineering, GeologicalGeosciences, MultidisciplinaryComputer ScienceEngineeringGeologyTOPOLOGY OPTIMIZATIONSHAPE OPTIMIZATIONHOMOGENIZATIONALGORITHM
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