Internal erosion of sandy gravels and occurrence of open-framework gravels in the subsoil of a river dike

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment Pub Date : 2025-06-01 DOI:10.1016/j.gete.2025.100690

Stéphane Bonelli , Laurence Girolami

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Abstract

When a river dike is built on a sandy gravel paleo-valley, successive floods can induce internal erosion. This is the subject of this work, with a finite element analysis of a river dike system. This type of analysis makes it possible to find artesian and uplift zones in the protected floodplain, an element to be integrated into flood hazard mapping. The study area is the River Agly in southern France, where numerous leaks, sand boils and sinkholes have been observed along the dikes. The aim is to better understand the origin of these surface signatures, as well as the cause of the presence of open-framework gravel in the subsurface. A suffusion model for sandy gravel was used to describe internal erosion. Internal erosion effectively transforms the sandy gravel into gravel, revealing open-framework gravel zones in the paleo-valley. Contact erosion in gravel can be triggered by suffusion, showing that new models coupling suffusion and contact erosion are needed to model internal erosion in sandy gravels.

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河堤底土中砂质砾石的内部侵蚀和开骨架砾石的出现

当河堤建在沙质砾石古山谷上时，连续的洪水会引起内部侵蚀。这是本工作的主题，用有限元法对某河堤防系统进行了分析。这种类型的分析使得在受保护的洪泛区中找到自流带和隆起带成为可能，这是将其整合到洪水灾害测绘中的一个元素。研究区域是法国南部的阿格利河，在那里沿堤防观察到许多泄漏，沙子沸腾和天坑。目的是更好地了解这些地表特征的起源，以及地下存在开放框架砾石的原因。采用砂砾石的渗流模型来描述内部侵蚀。内部侵蚀有效地将砂质砾石转化为砾石，在古山谷中显露出开框架砾石带。砾石内部的接触侵蚀可由浸渍引发，因此需要建立浸渍与接触侵蚀耦合的新模型来模拟砂质砾石内部侵蚀。

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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.