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A three-dimensional fluid-solid coupled numerical modeling of the barrier leakage below the excavation surface due to dewatering

Modélisation numérique tridimensionnelle couplée fluide-solide de fuites sous barrière sous la surface de fouille en raison du dénoyage

Un modelado numérico tridimensional acoplado fluido-sólido de filtración a través de una barrera debajo de la superficie de la excavación como consecuencia del drenaje

降水引起的基坑开挖面下方止水帷幕渗漏的三维流固耦合数值模拟

Modelagem numérica tridimensional acoplada fluido-sólido do vazamento de barreira abaixo da superfície da escavação devido à drenagem

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Abstract

Waterproof curtains are used as barriers to block groundwater during deep excavations; however, in practice, barrier leakage occurs frequently. This paper establishes a three-dimensional (3D) fluid-solid-coupled finite element model to analyse the effect of barrier leakage below the excavation surface. Uniform and local barrier leakages in a confined aquifer are simulated for a constant flow rate and fixed drawdown. The simulated results show that barrier leakage causes a variation in the flow direction, drawdown of the groundwater head outside of excavation, and significant additional deformation in the longitudinal direction. The factors influencing drawdown and ground settlement induced by leakage include leakage location, leakage area, barrier penetration depth, pumping-well penetration depth, and aquifer anisotropy. In addition, the simulation results show that the drawdown-time curves under various leakage conditions have similar patterns.

Résumé

Des parois étanches sont utilisées comme barrières pour bloquer les eaux souterraines lors de fouilles profondes; cependant, dans la pratique, des fuites au travers les barrières se produisent fréquemment. Cet article établit un modèle tri-dimensionnel (3D) couplé fluide-solide à éléments finis pour analyser l’effet des fuites de barrière sous la surface de la fouille. Des fuites uniformes et locales de barrière dans un aquifère captif sont simulées pour un débit constant et un rabattement fixe. Les résultats des simulations montrent que les fuites de barrière provoquent un changement de direction d’écoulement, un rabattement de la charge hydraulique en dehors de la fouille, et une déformation supplémentaire significative dans la direction longitudinale. Les facteurs influençant le rabattement et le tassement du terrain induits par les fuites comprennent la localisation des fuites, la surface de la zone des fuites, la profondeur de pénétration de la barrière, la profondeur de pénétration du puits de pompage, et l’anisotropie de l’aquifère. En outre, les résultats des simulations montrent que les courbes de rabattement en fonction du temps pour diverses conditions de fuite ont des comportements similaires.

Resumen

Las cortinas impermeables se utilizan como barreras para aislar las aguas subterráneas durante las excavaciones profundas; sin embargo, en la práctica, las filtraciones a través de la barrera se producen con frecuencia. En el presente documento se establece un modelo tridimensional (3D) de elementos finitos acoplados al fluido y al sólido para analizar el efecto de la filtración en la barrera bajo la superficie de la excavación. Se simulan filtraciones en barreras uniformes y locales en un acuífero confinado para un caudal constante y una depresión fija del nivel de agua. Los resultados simulados muestran que las filtraciones en la barrera causan una variación en la dirección del flujo, el descenso de la altura del agua subterránea fuera de la excavación y una deformación adicional significativa en la dirección longitudinal. Entre los factores que influyen en el descenso del nivel y el asentamiento del suelo inducidos por las filtraciones figuran la ubicación y zona de fuga, la profundidad de penetración en la barrera, la profundidad de penetración del pozo de bombeo y la anisotropía del acuífero. Además, los resultados de la simulación muestran que las curvas de tiempo de descenso del nivel del agua en diversas condiciones de filtración tienen pautas similares.

摘要

止水帷幕通常用作深基坑开挖过程中阻挡地下水的屏障。然而,在实际工程中,止水帷幕经常发生渗漏现象。本文建立了三维(3D)流固耦合的有限元模型,分析基坑开挖面下方止水帷幕渗漏对环境的影响。在定流量和定降深抽水的条件下,分别模拟了承压含水层中的止水帷幕均匀和局部渗漏的作用。结果表明,止水帷幕渗漏会引起地下水流方向的改变,基坑外地下水位的降低以及明显的附加变形。影响渗漏引起的水位降深和地表沉降的因素包括:渗漏点位置,渗漏面积,止水帷幕插入深度,降水井深度和含水层各向异性。此外,模拟结果还表明,在各种渗漏条件下的水位降深-时间曲线具有相似的模式。

Resumo

Cortinas impermeáveis são usadas como barreiras para bloquear as águas subterrâneas durante escavações profundas; no entanto, na prática, o vazamento de barreira ocorre com frequência. Este artigo estabelece um modelo tridimensional (3D) de elementos finitos acoplado fluido-sólido para analisar o efeito de vazamento de barreira abaixo da superfície da escavação. Vazamentos de barreira locais e uniformes em um aquífero confinado são simulados para uma vazão constante e rebaixamento fixo. Os resultados simulados mostram que o vazamento da barreira causa uma variação na direção do fluxo, queda da água subterrânea fora da escavação e deformação adicional significativa na direção longitudinal. Os fatores que influenciam a retirada e o assentamento do solo induzidos por vazamentos incluem o local do vazamento, a área do vazamento, a profundidade de penetração da barreira, a profundidade de penetração do poço de bombeamento e a anisotropia do aquífero. Além disso, os resultados da simulação mostram que as curvas de tempo de extração sob várias condições de vazamento têm padrões semelhantes.

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Funding

The research work described herein was funded by the National Nature Science Foundation of China (NSFC) (Grant No. 41807235) and was partially funded by the Research Funding of Shantou University for New Faculty Member (Grant No. NTF19024-2019) and the Innovative Research Funding of the Science and Technology Commission of Shanghai Municipality (Grant No. 18DZ1201102). These financial supports are gratefully acknowledged.

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Authors and Affiliations

  1. College of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai, 201620, China

    Yong-Xia Wu

  2. Key Laboratory of Intelligent Manufacturing Technology (Shantou University), Ministry of Education and Department of Civil and Environmental Engineering, College of Engineering, Shantou University, Shantou, 515063, Guangdong, China

    Hai-Min Lyu & Shui-Long Shen

  3. Discipline of Civil and Infrastructure, School of Engineering, Royal Melbourne Institute of Technology (RMIT), Victoria, 3001, Australia

    Shui-Long Shen & Annan Zhou

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  1. Yong-Xia Wu
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Correspondence to Shui-Long Shen.

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Wu, YX., Lyu, HM., Shen, SL. et al. A three-dimensional fluid-solid coupled numerical modeling of the barrier leakage below the excavation surface due to dewatering. Hydrogeol J 28, 1449–1463 (2020). https://doi.org/10.1007/s10040-020-02142-w

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