DEM investigation into the small-strain stiffness of bio-cemented soils

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Aoxi Zhang, Vanessa Magnanimo, Hongyang Cheng, Timo J. Heimovaara, Anne-Catherine Dieudonné
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引用次数: 0

Abstract

Bio-mediated methods, such as microbially induced carbonate precipitation, are promising techniques for soil stabilisation. However, uncertainty about the spatial distribution of the minerals formed and the mechanical improvements impedes bio-mediated methods from being translated widely into practice. To bolster confidence in bio-treatment, non-destructive characterisation is desired. Seismic methods offer the possibility to monitor the effectiveness and mechanical efficiency of bio-treatment both in the laboratory and in the field. To aid the interpretation of shear wave velocity measurements, this study uses the discrete element method to examine the small-strain stiffness of bio-cemented sands. Bio-cemented specimens with different characteristics, including properties of the host sand (void ratio, uniformity of particle size distribution) and properties of the precipitated minerals (distribution pattern, content, Young’s modulus), are modelled and subjected to static probing. The mechanisms affecting the small-strain properties of cemented soils are investigated from microscopic observations. The results identify two mechanisms controlling the mechanical reinforcement associated with bio-cementation, namely the number of effective bonds and the ability of a single bond to improve stiffness. The results show that the dominant mechanism varies with the properties of the host sand. These results support the use of seismic measurements to assess the mechanical efficiency and effectiveness of bio-mediated treatment.

Abstract Image

对生物加固土小应变刚度的 DEM 研究
以生物为媒介的方法,如微生物诱导碳酸盐沉淀,是很有前途的土壤稳定技术。然而,由于所形成的矿物质的空间分布和机械改良的不确定性,阻碍了生物介导方法广泛应用于实践。为了增强对生物处理的信心,需要进行非破坏性表征。地震方法为在实验室和现场监测生物处理的有效性和机械效率提供了可能。为了帮助解释剪切波速度测量结果,本研究采用离散元方法来检验生物加固砂的小应变刚度。对具有不同特征的生物加固试样(包括主砂的特征(空隙率、粒度分布的均匀性)和沉淀矿物的特征(分布模式、含量、杨氏模量))进行建模并进行静态探测。通过微观观察研究了影响胶结土小应变特性的机制。研究结果确定了两种与生物固结相关的机械加固控制机制,即有效粘结的数量和单个粘结提高刚度的能力。结果表明,主导机制随主砂的特性而变化。这些结果支持使用地震测量来评估生物介导处理的机械效率和效果。
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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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