Undrained Stability of Unsupported Rectangular Excavations: Anisotropy and Non-Homogeneity in 3D
Article
Article Title | Undrained Stability of Unsupported Rectangular Excavations: Anisotropy and Non-Homogeneity in 3D |
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ERA Journal ID | 210216 |
Article Category | Article |
Authors | Lai, Van Qui, Shiau Jim, Keawsawasvong, Suraparb, Seehavong, Sorawit and Cabangon, Lowell Tan |
Journal Title | Buildings |
Journal Citation | 12 (9), pp. 1-20 |
Article Number | 1425 |
Number of Pages | 20 |
Year | 2022 |
Publisher | MDPI AG |
Place of Publication | Switzerland |
ISSN | 2075-5309 |
Digital Object Identifier (DOI) | https://doi.org/10.3390/buildings12091425 |
Web Address (URL) | https://www.mdpi.com/2075-5309/12/9/1425 |
Abstract | The stability of unsupported rectangular excavations in undrained clay is examined under the influence of anisotropy and heterogeneity using the three-dimensional finite element upper and lower bound limit analysis with the Anisotropic Undrained Shear (AUS) failure criterion. Three anisotropic undrained shear strengths are considered in the study, namely triaxial compression, triaxial extension, and direct simple shear. Special considerations are given to the study of the linearly-increased anisotropic shear strengths with depth. The numerical solutions are presented by an undrained stability number that is a function of four dimensionless parameters, i.e., the excavated depth ratio, the aspect ratio of the excavated site, the shear strength gradient ratio, and the anisotropic strength ratio. To the authors’ best knowledge, this is the first of its kind to present the stability solutions of 3D excavation considering soil anisotropy and heterogeneity. As such, this paper introduces a novel approach for predicting the stability of unsupported rectangular excavation in undrained clays in 3D space, accounting for soil anisotropy and non-homogeneity. Notably, it develops a basis to formulate a mathematical equation and design charts for estimating the stability factor of such type of excavation, which should be of great interest to engineering practitioners. |
Keywords | anisotropy; excavations; finite element limit analysis; heterogeneity; stability |
ANZSRC Field of Research 2020 | 400502. Civil geotechnical engineering |
Byline Affiliations | Ho Chi Minh City University of Technology, Vietnam |
Vietnam National University, Vietnam | |
School of Engineering | |
Thammasat University, Thailand |
https://research.usq.edu.au/item/wzx7z/undrained-stability-of-unsupported-rectangular-excavations-anisotropy-and-non-homogeneity-in-3d
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