Chapter
Jun 6, 2018

Modeling Bio-Cemented Sands: A Strength Index for Cemented Sands

Publication: IFCEE 2018

Abstract

The establishment of the bio-inspired and bio-mediated sub-disciplines in the emerging field of biogeotechnology has led to the developments of many innovative methods and techniques. These methods and techniques potentially provide sustainable alternatives to conventional approaches that may be less desirable due to their use of high-embodied energy materials and processes. In particular, research within the bio-mediated sub-discipline over the past decade has fostered advancements in biocementation ground improvement methods that currently allow for possible field scale implementation. As a result, the ability to incorporate and sufficiently factor the associated mechanical enhancements during design is needed. The development of a constitutive model that properly assesses the level of improvement and adequately predicts the expected performance for a given level of cementation is underway. However, in order to accomplish the aforementioned goal, there is a need to develop components that are capable of capturing the behavior and transition from the cemented to uncemented state, while maintaining adherence to influential factors in the volumetric and stress states. This paper focuses on the development of strength in biocemented soils (via microbial induced calcite precipitation, MICP) and its evolution with cementation level under loading. The proposed strength correlation accounts for the observed nonlinearity of failure envelopes in sands and describes the strength of cemented sands as a function of density, confinement, mineralogy, and cementation.

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Published In

Go to IFCEE 2018
IFCEE 2018
Pages: 48 - 58

History

Published online: Jun 6, 2018

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Chukwuebuka C. Nweke [email protected]
Graduate Student, Dept. of Civil and Environmental Engineering, Univ. of California, Berkeley, 441 Davis Hall, Berkeley, CA 94720-1710. E-mail: [email protected]
Juan M. Pestana, Sc.D. [email protected]
Professor, Dept. of Civil and Environmental Engineering, Univ. of California, Berkeley, 746 Davis Hall, Berkeley, CA 94720-1710. E-mail: [email protected]

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