Engineering soil barriers to minimise annual shrinkage/swelling in plastic clays

IF 3.3 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment Pub Date : 2024-02-03 DOI:10.1016/j.gete.2024.100540

Aikaterini Tsiampousi , Charlotte Day , Alexandros Petalas

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Abstract

Engineered soil barriers have been proposed to prevent rainwater infiltration into the underlying soil, thus improving stability of sloping ground. The use of engineered barriers on flat ground as means of preventing flooding has also been explored. This paper aims to provide proof-of-concept as to the potential efficiency of engineered barriers in minimising soil shrinkage and swelling arising from seasonal variations of water content and pore water pressures within the ground due to its interaction with the atmosphere. A series of 2-dimensional, hydro-mechanically coupled finite element analyses were conducted to this effect. Emphasis was placed on accurately modelling the stiffness of the underlying soil, accounting for its small-strain behaviour, as well as the hydraulic behaviour of all the layers involved. The results confirm that it is possible to engineer barriers to minimise shrinkage/swelling in greenfield, as well as urban, conditions and highlight the influence of barrier geometry and configuration, so that recommendations for the design of such barriers can be made.

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工程土壤屏障，最大限度地减少可塑粘土的年收缩/膨胀

有人建议采用工程土壤屏障来防止雨水渗入下层土壤，从而提高坡地的稳定性。此外，还探讨了在平地上使用工程土屏障作为防洪手段的问题。本文旨在提供概念验证，证明工程土屏障在最大限度地减少土壤收缩和膨胀方面的潜在效率，而土壤收缩和膨胀是由于土壤含水量和孔隙水压力与大气相互作用而产生的季节性变化造成的。为此进行了一系列二维水力机械耦合有限元分析。重点是准确模拟下层土壤的刚度，考虑其小应变行为以及所有相关土层的水力行为。分析结果证实，可以在绿地和城市条件下设计屏障，最大限度地减少收缩/膨胀，并强调了屏障几何形状和配置的影响，从而为此类屏障的设计提出了建议。

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来源期刊

Geomechanics for Energy and the Environment Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

5.90

自引率

11.80%

发文量

期刊介绍： The aim of the Journal is to publish research results of the highest quality and of lasting importance on the subject of geomechanics, with the focus on applications to geological energy production and storage, and the interaction of soils and rocks with the natural and engineered environment. Special attention is given to concepts and developments of new energy geotechnologies that comprise intrinsic mechanisms protecting the environment against a potential engineering induced damage, hence warranting sustainable usage of energy resources. The scope of the journal is broad, including fundamental concepts in geomechanics and mechanics of porous media, the experiments and analysis of novel phenomena and applications. Of special interest are issues resulting from coupling of particular physics, chemistry and biology of external forcings, as well as of pore fluid/gas and minerals to the solid mechanics of the medium skeleton and pore fluid mechanics. The multi-scale and inter-scale interactions between the phenomena and the behavior representations are also of particular interest. Contributions to general theoretical approach to these issues, but of potential reference to geomechanics in its context of energy and the environment are also most welcome.