Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/139726
Title: DESIGN FRAMEWORK FOR CIRCULAR TUNNELS WITH CEMENT-ADMIXED SOIL SURROUNDS
Authors: AKANKSHA TYAGI
Keywords: tunnel, cement-admixed soil, stability, failure mode, spatial variability, design strength
Issue Date: 28-Jul-2017
Source: AKANKSHA TYAGI (2017-07-28). DESIGN FRAMEWORK FOR CIRCULAR TUNNELS WITH CEMENT-ADMIXED SOIL SURROUNDS. ScholarBank@NUS Repository.
Abstract: In this thesis, the failure behaviour and stability of tunnels in cement-admixed soil surrounds are studied by centrifuge and finite element modelling. The dominant failure modes are identified from centrifuge tests and results are used to develop a numerical model in geotechnical finite element software package, GeoFEA9. A failure map, modified stability equation and stability chart are proposed based on the experimental data and parametric studies done in numerical modelling. In addition to single tunnel study, the effect of failure of temporary opening on stability of existing tunnel in improved soil surround is also studied. Further, the influence of spatial variability and heterogeneity in the strength and stiffness of cement-treated soils is examined by using random finite element analysis. Finally, the degradation in stability due to spatial variability is quantified in terms of the design strength ratios and strength reduction factors.
URI: http://scholarbank.nus.edu.sg/handle/10635/139726
Appears in Collections:Ph.D Theses (Open)

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