Long-term “memory” of extraordinary climatic seasons in the hysteretic seepage of an unsaturated infinite slope

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Acta Geotechnica Pub Date : 2024-04-25 DOI:10.1007/s11440-024-02307-x
Diana Bianchi, Domenico Gallipoli, Rossella Bovolenta, Martino Leoni
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Abstract

This paper presents a study of the hydraulic response of an infinite unsaturated slope exposed to a perturbation of the ordinary seasonal climatic cycle. The ground flow is modelled via a simplified one-dimensional finite difference scheme by decomposing the two-dimensional slope seepage into antisymmetric and symmetric parts. The numerical scheme incorporates two distinct hysteretic and non-hysteretic soil water retention laws, whose parameters have been selected after a preliminary sensitivity analysis. Results indicate that, in the hysteretic case, the “memory” of the perturbation takes a long time to fade, and the ordinary soil saturation cycle is only restored after several years of normal weather. Instead, in the non-hysteretic case, the recovery of the ordinary saturation regime is almost immediate after the perturbation. In contrast with the markedly different predictions of degree of saturation, both hysteretic and non-hysteretic slope models predict virtually identical evolutions of negative pore water pressures, with an almost immediate restoration of the ordinary cycle after the perturbation.

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非饱和无限坡滞后渗流对特殊气候季节的长期 "记忆"
本文研究了暴露在普通季节性气候周期扰动下的无限非饱和斜坡的水力响应。通过将二维斜坡渗流分解为非对称和对称两部分,采用简化的一维有限差分方案对地面流进行建模。数值方案包含两种不同的滞后和非滞后土壤水分保持规律,其参数是在初步敏感性分析后选定的。结果表明,在滞后情况下,扰动的 "记忆 "需要很长时间才能消退,只有在几年正常天气后才能恢复正常的土壤饱和周期。相反,在非滞后情况下,扰动后几乎立即恢复正常饱和状态。与对饱和度的明显不同预测形成对比的是,滞回和非滞回斜坡模型对负的孔隙水压力的预测几乎完全相同,在扰动后几乎立即恢复正常循环。
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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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