Alabdulmuhsen, Shaikha Abdulaziz;
(2023)
Characterisation of the Behaviour of Boubyan Clay Mixed with Waste Tyre Crumbs to Reduce Environmental Impact.
Doctoral thesis (Ph.D), UCL (University College London).
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Abstract
Previous studies in Boubyan Island, Kuwait, indicated that the top 15-26 m thick soil layer is a thick soft clay layer, which is a concern to carry out various infrastructure projects as part of island’s master plan. The soft to very soft clay is characterised by high consolidation settlements and low bearing capacity. Understanding the mechanical behaviour of the soil, together with suitable and economical ground improvement techniques to withstand loading conditions from planned infrastructure projects is necessary. Samples from a test pit and two boreholes were collected and subjected to various tests in the laboratory. Compressibility of undisturbed, reconstituted and compacted samples, with and without rubber reinforcement, demonstrated that the consolidation curves have a similar shape, however a unique normal compression line was not found. Values of the ‘m’ parameter between 0.4 and 0.6 were measured, indicating a clear transitional behaviour. Consolidated-undrained triaxial tests revealed that the material shows a phase transformation, and a truly compressible stress path was not achieved. The results also revealed a transitional behaviour, with a non-unique critical state line, with the parameter ‘P’ in shearing determined at 0.43. The results from the samples reinforced with rubber granules show that this type of reinforcement only improves strength at low void ratios, showing either similar strengths (5% reinforcement) or lower strengths (20% reinforcement) for the densest samples. Normalisation of the triaxial results by normal compression and critical state lines, assuming that the lines are parallel but have intercepts proportional to the initial void ratio, revealed that the Roscoe/Rendulic state boundary surface is impossible to determine with the current state of the art. However, when the material is compacted with or without reinforcement, the results are more homogeneous, and it is possible to determine a Hvorslev state boundary surface that could be used for all compacted samples.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | Characterisation of the Behaviour of Boubyan Clay Mixed with Waste Tyre Crumbs to Reduce Environmental Impact |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2023. Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) Licence (https://creativecommons.org/licenses/by-nc/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10168706 |
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