- Title
- Lime stabilisation of an Australian silty clay and its application in construction of excavation retaining walls by cutter soil mixing
- Creator
- Ranjbar Pouya, Kaveh
- Date
- 2018
- Type
- Text; Thesis; PhD
- Identifier
- http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/166885
- Identifier
- vital:13540
- Identifier
- https://library.federation.edu.au/record=b2771674
- Abstract
- Coode Island Silt (CIS) is one of the predominant geological units in Melbourne, Australia. Having high compressibility and low shear strength, CIS is considered a problematic soft soil that challenges the construction of infrastructure in the region. To tackle such challenges, one practical approach is the application of ground improvement techniques such as in situ soil mixing. This PhD study focuses on the application of Cutter Soil Mixing (CSM) for the construction of excavation retaining walls in CIS. Although cement is widely used in most CSM projects, this study investigates the suitability of different lime types available in the Australian market as a potential alternative to cement for the stabilisation of CIS. To investigate the effect of lime stabilisation, a comprehensive geotechnical characterisation of untreated and lime treated CIS is performed. Four different lime types are used: agricultural lime, quicklime, hydrated lime and slag lime. Based on the results obtained from strength tests, slag lime was found to be the most effective among the four types that were tested. The optimum slag lime to CIS ratio is then found for the construction of retaining walls in CIS. Having the geotechnical characterisation of untreated and treated CIS from the laboratory experiments, a series of two-dimensional and three-dimensional finite element method (FEM) analyses were conducted to investigate the applicability and reliability of the selected mixing ratio for the construction of CSM excavation retaining walls in CIS. A nonlinear constitutive soil model was employed, calibrated and verified to be used in FEM analyses to investigate both the stability factor of safety and excavation-induced deformations. The results obtained for both undrained and fully coupled flow deformation analyses prove that CSM panels can be constructed by mixing slag lime and CIS to act as retaining walls to allow for deep excavation in CIS.; Doctor of Philosophy
- Publisher
- Federation University Australia
- Rights
- Copyright Kaveh Ranjbar Pouya
- Rights
- Open Access
- Rights
- This metadata is freely available under a CCO license
- Subject
- Soil stabilisation; In situ soil mixing; Lime treatment; Cutter soil mixing; Hardening soil model; Excavation; Numerical modelling
- Full Text
- Thesis Supervisor
- Tolooiyan, Ali
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