通过酶诱导碳酸盐沉淀降低非粘性土壤的侵蚀性

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Yingzheng Zhou, Dawei Guan, Liang Cheng, Yee-Meng Chiew, Jinhai Zheng
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引用次数: 0

摘要

酶诱导碳酸盐沉淀(EICP)可在土壤基质中析出碳酸钙以固结颗粒,是一种很有前景的生物介导冲刷对策。本研究探讨了生物加固砂在封闭导管水槽系统中的侵蚀性能,研究了 EICP 在减轻冲刷和降低侵蚀性方面的有效性。研究了固化时间、胶结度和脲酶活性等各种参数,以了解它们对侵蚀行为的影响。此外,研究还结合了碳酸钙含量和晶体微观结构分析,以更好地了解 EICP 在减轻冲刷方面的作用机制。这些结果凸显了碳酸钙含量和晶体特征之间的相互作用在决定侵蚀性降低效果方面的关键作用。随着析出量的增加,胶结土壤表现出更强的抗水力侵蚀能力,侵蚀模式从颗粒侵蚀和聚集剥离转变为大块断裂。换句话说,沉积物的迁移模式主要受晶体尺寸、晶体数量和沉积形态变化的影响。此外,还提出了两个阈值希尔兹参数和侵蚀速率的预测公式。值得注意的是,在使用 1 M 尿素和氯化钙、固化时间为 24 小时的 EICP 处理条件下,固结土壤可在 4 m/s 的高流速下保持稳定。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Reducing non-cohesive soil erodibility through enzyme-induced carbonate precipitation

Enzyme-induced carbonate precipitation (EICP), which precipitates calcium carbonate within the soil matrix to cement the granular grains, presents a promising bio-mediated approach for scour countermeasures. This study explores the erosion performance of bio-cemented sand in a closed-conduit flume system, investigating the effectiveness of EICP in mitigating scour and reducing erodibility. Various parameters such as curing duration, cementation degrees and urease activities are examined to understand their influence on erosion behaviors. Furthermore, the study incorporates the analysis of calcium carbonate content and crystal microstructure to provide a better understanding on the EICP mechanism in scour mitigation. These results highlight the critical role of the interaction between calcium carbonate content and crystal features in determining the effectiveness of erodibility reduction. As the precipitated amount increases, the cemented soil exhibits enhanced hydraulic erosion resistance, with the erosion mode shifting from particle erosion and aggregated detachment to chunk fracture. In other words, the mode of sediment transport essentially is affected by the variations in crystal size, crystal quantities and deposited morphology. Two predictive formulas for threshold Shields parameter and erosion rate are also developed. Notably, the cemented soil could maintain its stability under an elevated flow of 4 m/s under an EICP treatment with 1 M of urea and calcium chloride, and a curing duration of 24 h. These findings are anticipated to serve as a valuable theoretical foundation for engineering applications.

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来源期刊
Acta Geotechnica
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.
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