Load-settlement behavior of microbially improved sands

Date

2024-1-24

Author

Sarıçiçek, Yılmaz Emre

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Microbially induced calcium carbonate precipitation (MICP) based improvement methods on soils have been increasingly investigated for the last few decades. The scale of laboratory experiments and range of soil types are extending. In this study, the general framework was constructed on three pillars as biological improvements, one-dimensional loading tests and foundation model tests. Biological improvements part consists of investigation of innovative bacteria cultivation methods, determining viable techniques and media for introducing bacteria to the soil and finally image processing utilization for detection of calcium carbonate precipitates enabling a non-destructive way especially for surficial applications. One-dimensional loading tests cover tests on treated Çine Sand and Quartz Sand specimens prepared under various configurations. These experiments prove that under proper circumstances, exceptional precipitation rates can be achieved and notable reductions in settlements are obtained. Finally, foundation model tests on Çine Sand indicate both under dry and wet conditions exceptional results in terms of settlement behavior under loading are accomplished. Tests under dry conditions perform better compared to wet conditions. Deep and foundation side applications, intermittent bio-dosing provide highly satisfying results pointing out the adjustability of MICP to diverse conditions. Moreover, the verification of mechanical tests can considerably be succeeded via commercial finite element solution software.

Subject Keywords

Microbially Induced Calcium Carbonate Precipitation, S. pasteurii, One-dimensional Loading, Foundation Model Tests

URI

https://hdl.handle.net/11511/108492

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Graduate School of Natural and Applied Sciences, Thesis