Analysis of maximum arching conditions in active plane-strain trapdoors in sand

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Authors

Osman, Ashraf S.
Jacobsz, Schalk Willem

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Elsevier

Abstract

The trapdoor problem is a useful model to understand the stress distribution around geo-structures. This paper focuses on evaluating the conditions of maximum arching (minimum loads on trapdoors) developing during the lowering of plane-strain active trapdoors in cohesionless granular materials. A parametric study using finite element analysis has been performed to investigate various factors affecting the maximum arching conditions in active trapdoors, with a particular focus on the effect of soil dilatancy. The paper also presents rigorous upper bound limit analysis solutions. Previously published solutions dealing with soil non-associativity have been discussed and compared with the finite element results. The finite element analysis shows that using a Mohr Column model with the associative flow rule and reduced strength parameters, overestimates the load reduction on trapdoors compared with a non-associative model with full soil strength parameters.

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Keywords

Trapdoor mechanism, Arching, Finite element analysis, Upper bound limit analysis, Soils, Strain, Associative flows, Associative models, Column modeling, Parametric study, Solutions dealing, Strength parameters

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Citation

Osman, A.S. & Jacobsz, S.W. 2019, 'Analysis of maximum arching conditions in active plane-strain trapdoors in sand', Computers and Geotechnics, vol. 113, art. 103089, pp. 1-11.