The traditional design methodologies for tunnel and underground excavations are divided in to
three categories: Empirical, Analytical, and Observational approaches, whereas in the last years the
Numerical approach has strongly become popular both for the intrinsic simplicity of the software
packages and their ability to manage problems unsolvable with the classic methods.
In this thesis, the underground openings have been analyzed using constitutive models other than
the Mohr-Coulomb theory. FLAC is used for the analysis and the software has been implemented to
include the Polyaxial Strength Criterion. The details of the modifications made in the software are
presented and the results are compared with the Singh's elasto-plastic stress distribution in
squeezing grounds.
The applicability of the Polyaxial Strength Criterion has been therefore extended to all the
numerical suites designed for geo-mechanical purposes (FEM, FDM, …) and the obtained results
compared to the observations of deformation and radial squeezing pressure of the instrumented
tunnels in the Chibro-Khodri underground power station.
This study will develop better comprehension of the behavior of the underground openings and also
provide a useful tool to the designers in the planning stages. / Thesis (Ph.D.)-University of KwaZulu-Natal, Durban, 2012.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:ukzn/oai:http://researchspace.ukzn.ac.za:10413/9114 |
| Date | January 2012 |
| Creators | Scussel, Dario. |
| Contributors | Chandra, Sarvesh., Trois, Cristina. |
| Source Sets | South African National ETD Portal |
| Language | en_ZA |
| Detected Language | English |
| Type | Thesis |
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