Abstract
Traditional slope stability analysis involves predicting the location of the critical slip surface for a given slope and computing a safety factor at that location. However, for some slopes with complicated stratigraphy several distinct critical slip surfaces can exist. Furthermore, the global minimum safety factor in some cases can be less important than potential failure zones when rehabilitating or reinforcing a slope. Existing search techniques used in slope stability analysis cannot find all areas of concern, but instead converge exclusively on the critical slip surface. This paper therefore proposes the use of a holistic multi modal optimisation technique which is able to locate and converge to multiple failure modes simultaneously. The search technique has been demonstrated on a number of benchmark examples using both deterministic and probabilistic analysis to find all possible failure mechanisms, and their respective factors of safety and reliability indices. The results from both the deterministic and probabilistic models show that the search technique is effective in locating the known critical slip surface while also establishing the locations of any other distinct critical slip surfaces within the slope. The approach is of particular relevance for investigating the stability of large slopes with complicated stratigraphy, as these slopes are likely to contain multiple failure mechanisms.
Original language | English |
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Pages (from-to) | 172-179 |
Number of pages | 8 |
Journal | Computers and Geotechnics |
Volume | 66 |
Early online date | 16 Feb 2015 |
DOIs | |
Publication status | Published - 1 May 2015 |
Funding
The authors would like to acknowledge the support of the Earth and Natural Sciences (ENS) Doctoral Studies Programme, funded by the Higher Education Authority (HEA) through the Programme for Research at Third Level Institutions, Cycle 5 (PRTLI-5), co-funded by the European Regional Development Fund (ERDF) and the European Union Framework 7 project SMART RAIL (Project No. 285683). The second author acknowledges the funding received from the State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining and Technology (SKLGDUEK1003).
Keywords
- Deterministic analysis
- Multi-modal failure
- Multi-modal optimisation
- Probabilistic analysis
- Slope stability
ASJC Scopus subject areas
- Geotechnical Engineering and Engineering Geology
- Computer Science Applications
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Cormac Reale
- Department of Architecture & Civil Engineering - Lecturer
- Centre for Sustainable Energy Systems (SES)
Person: Research & Teaching, Core staff