Moshirian, Sahand (2022). Fibre-reinforced granular columns in soft clay. University of Birmingham. Ph.D.
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Moshirian2022PhD.pdf
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Abstract
The compacted granular column method is a technically viable and cost-effective procedure to improve the stability of soft clay soils to withstand low to moderate loading conditions. In this system, the granular columns derive their carrying capacity from the mobilisation of passive earth pressure and horizontal support of surrounding soil as the piles bulge and expand laterally under loading. In extremely soft soils, columns could not provide significant axial load capacity and sufficient shear resistance due to low radial support offered by surrounding soil. Therefore, the columns may fail due to lateral expansion and excessive bulging or undergo a shear failure and lateral translation. In this laboratory-based research study, reinforced sand and quarry fines are suggested as potential substitute filling materials to design and construct compacted granular piles. In a novel approach, the weak clay bed is treated with fibre-reinforced compacted granular columns in a laboratory scaled modelling. The effects of fibre properties and soil strength on bearing capacity and settlement behaviour of the soft ground that has been reinforced with granular columns are investigated by conducting strain-controlled and cyclic loading tests on the single column models. The results show 20% to 30% of improvement in bearing capacity of quarry fines columns when reinforced with fibres. Using fibre-reinforced quarry fines as the column infill material is can control lateral translation and bulging of the column by (1) increasing the shear strength of materials (2) increasing total length of bulging and distributing load to lower depth where lateral support is greater.
| Type of Work: | Thesis (Doctorates > Ph.D.) | |||||||||
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| Award Type: | Doctorates > Ph.D. | |||||||||
| Supervisor(s): |
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| Licence: | All rights reserved | |||||||||
| College/Faculty: | Colleges (2008 onwards) > College of Engineering & Physical Sciences | |||||||||
| School or Department: | School of Engineering, Department of Civil Engineering | |||||||||
| Funders: | None/not applicable | |||||||||
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) | |||||||||
| URI: | http://etheses.bham.ac.uk/id/eprint/12554 |
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