Soybean-urease-induced CaCO3 precipitation as a new geotechnique for improving expansive soil

IF 5.6 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Acta Geotechnica Pub Date : 2024-12-11 DOI:10.1007/s11440-024-02481-y

Mingdong Li, Wei Liu, Jingwu Zhang, Chaopeng Lang, Guizhong Xu, Liping Zhu, Qiang Tang

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Abstract

In this study, soybean-urease-induced CaCO₃ precipitation (SICP) was proposed as a new geotechnique for improving expansive soil without precedent. SICP-reinforced expansive soil (SRES) specimens, as well as unreinforced expansive soil specimens as control samples were prepared following standard proctor tests at various moisture contents (20, 23, 26, 29, and 32%). Differential free swell tests, expansive potential tests, swelling pressure tests, shrinkage tests, compression tests, direct shear tests, unconfined compression tests, particle size analysis tests, and scanning electron microscope tests were carried out on the specimens. The results reveals that SICP reinforcement prompts distinct increases in compacted dry density, UCS, cohesion, and internal friction angle of expansive soil, while induces a remarkable reduction in DFS, swell potential, swelling pressure, and shrinkage of expansive soil. For instance, the compacted maximum dry density increases from 11.5 kN/m³ for UES to 12.5 kN/m³ for SRES and the optimum moisture content decreases correspondingly from 26.4% for UES to 23.6% for SRES. Furthermore, the reinforcing mechanics of SICP for expansive soil are analyzed and graphically presented. In conclusion, this research identifies SICP reinforcement to be an effective solution to problematic expansive soil and provides fundamental data for engineering practices.

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来源期刊

Acta Geotechnica ENGINEERING, GEOLOGICAL-

CiteScore

9.90

自引率

17.50%

发文量

297

审稿时长

4 months

期刊介绍： Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.