Xuwen Tian, Hongbin Xiao, Hunayu Su, Qianwen Ouyang
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引用次数: 0
Abstract
Microbial-induced carbonate precipitation (MICP) is a promising method for improving the properties of geotechnical engineering materials. However, little research has been conducted on the creep behavior and long-term strength of MICP-treated expansive soil. Therefore, this study performed triaxial consolidated undrained creep tests to investigate the improvement effect of MICP on the creep behavior and long-term strength of expansive soil. The results indicate that with the increase of deviatoric stress, the creep process of MICP-treated expansive soil includes four stages: instantaneous creep, decelerating creep, steady-state creep, and accelerated creep. Based on the creep test results, a calculation method has been proposed to quickly and accurately determine the long-term shear strength of MICP-treated expansive soil. Under different confining pressure conditions, the long-term shear strength of the improved expansive soil has been significantly increased, indicating that the MICP method can effectively enhance the long-term shear strength of expansive soil. Furthermore, both the long-term cohesion and the long-term internal friction angle of the MICP-improved expansive soil have been slightly reduced, with the long-term shear strength being approximately 65 to 70% of the short-term shear strength. This study confirms the positive effects of the MICP method on inhibiting the creep of expansive soil and enhancing its long-term strength.
期刊介绍:
The Arabian Journal of Geosciences is the official journal of the Saudi Society for Geosciences and publishes peer-reviewed original and review articles on the entire range of Earth Science themes, focused on, but not limited to, those that have regional significance to the Middle East and the Euro-Mediterranean Zone.
Key topics therefore include; geology, hydrogeology, earth system science, petroleum sciences, geophysics, seismology and crustal structures, tectonics, sedimentology, palaeontology, metamorphic and igneous petrology, natural hazards, environmental sciences and sustainable development, geoarchaeology, geomorphology, paleo-environment studies, oceanography, atmospheric sciences, GIS and remote sensing, geodesy, mineralogy, volcanology, geochemistry and metallogenesis.