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Stability of Unsupported Vertical Circular Excavations

Kumar, Jyant / Chakraborty, Manash / Sahoo, Jagdish Prasad

Abstract

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 $ϕ$ , 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 $H / b$ , $ϕ$ , and $m$ change. The results of the analysis compare quite well with the different solutions reported in the literature.

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Stability of Unsupported Vertical Circular Excavations

Kumar, Jyant / Chakraborty, Manash / Sahoo, Jagdish Prasad

Abstract

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 $ϕ$ , 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 $H / b$ , $ϕ$ , and $m$ change. The results of the analysis compare quite well with the different solutions reported in the literature.

Stability of Unsupported Vertical Circular Excavations

Kumar, Jyant / Chakraborty, Manash / Sahoo, Jagdish Prasad

Abstract

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 $ϕ$ , 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 $H / b$ , $ϕ$ , and $m$ change. The results of the analysis compare quite well with the different solutions reported in the literature.

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Title:

Stability of Unsupported Vertical Circular Excavations

Contributors:

Kumar, Jyant (author) / Chakraborty, Manash (author) / Sahoo, Jagdish Prasad (author)

Published in:

Journal of Geotechnical and Geoenvironmental Engineering ; 140

Publication date:

2014-03-21

ISSN:

1090-0241 , 1943-5606

DOI:

https://doi.org/10.1061/(ASCE)GT.1943-5606.0001118

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

Unknown

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