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Stability of Unsupported Vertical Circular Excavations

Kumar, Jyant and Chakraborty, Manash and Sahoo, Jagdish Prasad (2014) Stability of Unsupported Vertical Circular Excavations. In: JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, 140 (7).

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Official URL: http://dx.doi.org/10.1061/(ASCE)GT.1943-5606.00011...


A methodology has been presented for determining the stability of unsupported vertical cylindrical excavations by using an axisymmetric upper bound limit analysis approach in conjunction with finite elements and linear optimization. For the purpose of excavation design, stability numbers (S-n) have been generated for both (1) cohesive-frictional soils and (2) pure cohesive soils, with an additional provision accounting for linearly increasing cohesion with increasing depth by means of a nondimensional factor m. The variation of S-n with H/b has been established for different values of m and phi, where H and b refer to the height and radius of the cylindrical excavation. A number of useful observations have been gathered about the variation of the stability number and nodal velocity patterns as H/b, phi, and m change. The results of the analysis compare quite well with the different solutions reported in the literature. (C) 2014 American Society of Civil Engineers.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the ASCE
Keywords: Clays; Failures; FEM; Limit analysis; Optimization; Plasticity
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Depositing User: Id for Latest eprints
Date Deposited: 22 Jul 2014 11:52
Last Modified: 22 Jul 2014 11:52
URI: http://eprints.iisc.ac.in/id/eprint/49506

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