Response of anisotropy modeled compacted embankment during infiltration

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Acta Geotechnica Pub Date : 2024-07-22 DOI:10.1007/s11440-024-02374-0
Rakshanda Showkat, G. L. Sivakumar Babu
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Abstract

During rainfall, collapse compression predominates due to the slippage of particles, resulting in the rearrangement of soil fabric toward a configuration dependent on the fabric of the initial stress state. Consequently, these alterations in soil fabric induce anisotropic mechanical behavior in unsaturated soils. In this study, an anisotropic model, denoted as ABBM and based on the Barcelona Basic Model (BBM), was implemented into FLAC to analyze the wetting behavior of a typical compacted embankment during infiltration. The research findings indicate that prolonged rainfall durations result in the evolution of the yield surface, consequently amplifying vertical surface displacement. Moreover, as the anisotropic evolution parameter surpasses a defined threshold, the degree of anisotropy diminishes, ultimately resembling the isotropic behavior observed in the Barcelona Basic Model (BBM) due to changes in preconsolidation pressure. The study presents an innovative approach to evaluate embankment performance under rainfall-induced conditions by considering changes in fabric anisotropy relative to the degree of saturation. The results demonstrate that alterations in the degree of saturation lead to rotation of the yield surface, nearly erasing anisotropy upon reaching full saturation. To account for parameter variability, a reliability analysis was performed using the Monte Carlo method, assessing the performance of embankment using different constitutive models, viz, the Mohr–Coulomb model, BBM, and ABBM. Notably, the analysis revealed that embankment failure probabilities simulated using the ABBM exceed those obtained using the Mohr–Coulomb criterion or BBM, suggesting a greater susceptibility to failure in terms of deformations. This observation has practical significance in a sense that use of appropriate constitutive models in embankments is required.

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各向异性模型压实路堤在渗透过程中的反应
在降雨过程中,由于颗粒的滑动,塌陷压缩占主导地位,导致土壤结构重新排列,形成与初始应力状态的结构相关的结构。因此,土壤结构的这些变化引起了非饱和土壤中各向异性的力学行为。本研究将基于巴塞罗那基本模型(BBM)的各向异性模型(ABBM)应用到 FLAC 中,以分析典型压实路堤在渗透过程中的湿润行为。研究结果表明,降雨持续时间的延长会导致屈服面的演变,从而扩大垂直表面位移。此外,当各向异性演化参数超过规定的临界值时,各向异性的程度就会减弱,最终类似于巴塞罗那基本模型(BBM)中观察到的各向同性行为,这是由于预固结压力的变化造成的。该研究提出了一种创新方法,通过考虑织物各向异性相对于饱和度的变化来评估降雨条件下的路堤性能。结果表明,饱和度的变化会导致屈服面的旋转,在达到完全饱和时几乎会消除各向异性。为了考虑参数的可变性,使用蒙特卡罗方法进行了可靠性分析,评估了使用不同构成模型(即莫尔-库仑模型、BBM 和 ABBM)的堤坝性能。值得注意的是,分析结果表明,使用 ABBM 模拟的堤坝破坏概率超过了使用莫尔-库仑准则或 BBM 模拟的概率,这表明堤坝在变形方面更容易发生破坏。这一观察结果具有实际意义,即需要在路堤中使用适当的构成模型。
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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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