Date

2016

Document Type

Dissertation

Degree

Doctor of Philosophy

Department

Civil Engineering

First Adviser

Suleiman, Muhannad T.

Abstract

Biomediated geochemical processes in soil offer innovative and sustainable potential solutions to some geotechnical challenges. Microbial Induced Carbonate Precipitation (MICP) has been the most researched process for geotechnical problems. Most of the research that have been performed on MICP focused on investigating its effects on soil behavior at small lab-scale. Limited particle-scale (micro-scale) and field-or large laboratory-scale tests were conducted. Furthermore, challenges of upscaling MICP to real applications still exist, including heterogeneous CaCO3 distribution due to bio-clogging, soil properties (e.g. modulus and permeability) monitoring, and byproducts management, etc. The goal of the research presented in this dissertation focuses on investigating the MICP-treated soil behavior ranging from particle-scale to macro-scale, addressing some upscaling challenges, and advancing MICP towards practically-feasible field applications. The major effort of this research focuses on investigating physical properties of MICP-treated sand and MICP bio-grouted permeable pile system ranging from particle-to large laboratory-scale (e.g. micrometer to meter scale). The results from tests at different scales demonstrate that MICP improved soil mechanical behavior and enhanced the capacity of permeable pile foundation system. The research demonstrate a promising potential for field-scale foundation enhancement using MICP, which is envisioned to be the main focus of future research. In addition, a preliminary study on the effects of biofilm modification on the physical sand properties is conducted.

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