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On the stability of intact and fissured slopes subject to seismic action

Lookup NU author(s): Professor Stefano Utili, Akram (PGR) Abd



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


A set of analytical solutions achieved by the upper bound theorem of limit analysis and the pseudo-staticapproach is presented for the assessment of the stability of homogeneous c, ϕ slopes manifesting verticalcracks and subject to seismic action. Rotational failure mechanisms are considered for slopes with cracksof either known or unknown depth and location. A validation exercise was carried out based on numericallimit analyses and displacement-based finite-element analyses with strength reduction technique.Charts providing the stability factor for fissured slopes subject to both horizontal and vertical accelerationsfor any combination of c, ϕ and slope inclination are provided. The effect of the direction of thevertical acceleration on slope stability is specifically analysed. Yield seismic coefficients are also provided.When the presence of cracks within the slope can be ascertained with reasonable confidence, mapsshowing the zones within the slope where they have no destabilising effect are provided.Finally, Newmark’s method was employed to assess the effect of cracks on earthquake induced displacements.To this end, displacement coefficients are provided in chart form as a function of the slope characteristics. Twoexamples of slopes subjected to known earthquakes are illustrated.

Publication metadata

Author(s): Utili S, Abd A

Publication type: Article

Publication status: Published

Journal: International Journal for Numerical and Analytical Methods in Geomechanics

Year: 2016

Volume: 40

Issue: 5

Pages: 785-806

Print publication date: 10/04/2016

Online publication date: 16/02/2016

Acceptance date: 10/12/2015

Date deposited: 22/02/2017

ISSN (print): 0363-9061

ISSN (electronic): 1096-9853

Publisher: John Wiley & Sons, Ltd


DOI: 10.1002/nag.2498


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