Undrained cyclic responses of biocemented calcareous silty sand

IF 5.6 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Acta Geotechnica Pub Date : 2024-04-26 DOI:10.1007/s11440-024-02293-0

Yang Xiao, Jian Hu, Jinquan Shi, Lei Zhang, Hanlong Liu

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Abstract

Microbially induced calcium carbonate precipitation (MICP) technology is an emerging and environmentally sustainable method for improving the strength and stiffness of soil. Specifically, this innovative approach has gained favor in marine engineering due to the advantaged compatibility between precipitated calcium carbonate induced by MICP and coral sand. Sand containing fines is susceptible to liquefy. Whereas, the impact of fines contents on cyclic behavior of MICP-treated calcareous sand remains uncertain. Consequently, this technical note aims to investigate the liquefaction behavior of biocemented calcareous silty sand by conducting undrained cyclic triaxial shear tests and microscopic analysis. The results revealed the patterns of the excess pore water pressure curves and cyclic deformation characteristics as the fines contents increased. The liquefaction resistance of biocemented sand initially decreases with the addition of fines but subsequently exhibits an increasing trend. Microscopic analysis showed that at the cementation level with the cementation solution concentration of 1 mol/L, the calcium carbonate crystals are mainly attached to the surface of sand grains and this pattern does not directly affect the force chain.

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生物加固钙质淤泥砂的无排水循环响应

微生物诱导碳酸钙沉淀（MICP）技术是一种新兴的、环境可持续的提高土壤强度和刚度的方法。具体而言，由于微生物诱导碳酸钙沉淀与珊瑚砂之间的相容性极佳，这种创新方法在海洋工程中备受青睐。含有细粒的沙子容易液化。而细粒含量对 MICP 处理过的钙质砂的循环行为的影响仍不确定。因此，本技术说明旨在通过进行不排水循环三轴剪切试验和显微分析，研究生物加固钙质淤泥砂的液化行为。结果显示了随着细粒含量的增加，过剩孔隙水压力曲线的变化规律和循环变形特征。生物加固砂的抗液化性最初会随着细粒的添加而降低，但随后会呈现上升趋势。显微分析表明，在胶结液浓度为 1 mol/L 的胶结水平，碳酸钙晶体主要附着在砂粒表面，这种形态并不直接影响力链。

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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.