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- Title
Investigation on the Shear Behavior and Mechanism of MICP-Treated Loess Soil.
- Authors
Chen, Yang; Zhao, Li; Zi, Jiaojiao; Han, Jianyong; Zhang, Chaozhe
- Abstract
Microbially induced carbonate precipitation (MICP) has been utilized as a new method to improve loess soil strength. In this study, we investigated the influence of the main parameters on the shear strength of MICP-treated loess specimens. Initially, culture media with different formulas and pH values were examined to identify the most efficient medium for loess soil. To explore the shear behavior of MICP-treated loess under general stress levels, unconfined compressive strength (UCS) tests and triaxial tests relevant to the compression strength and vertical loads were performed on MICP-treated loess with different calcium sources, cementation concentrations, and curing periods. Subsequently, calcium chloride was selected as the optimal calcium source based on the ultimate strength of the MICP-treated loess. The effective cementation concentration in the loess soil was between 1.0 and 1.25 M. The ultimate strength of the MICP-treated loess was 3.6 times of the untreated loess. The stress-strain curves indicate that a higher cementing effect can be expected with an increase in the curing period. The formation process of calcium carbonate and the micromorphology of the MICP-treated loess samples were examined using scanning electron microscopy. In this study, we present an environmentally friendly technique for improving loess soil strength.
- Subjects
CALCIUM chloride; LOESS; ULTIMATE strength; STRESS-strain curves; SOILS; SHEAR strength
- Publication
Geofluids, 2024, Vol 2024, p1
- ISSN
1468-8115
- Publication type
Article
- DOI
10.1155/2024/8001743