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Hydro-mechanical modeling of sinkhole occurrence processes in covered karst terrains during a flood.

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Title: Hydro-mechanical modeling of sinkhole occurrence processes in covered karst terrains during a flood.
Authors: Luu, Li-Hua1 (AUTHOR) li-hua.luu@irstea.fr, Noury, Gildas1,2 (AUTHOR) g.noury@brgm.fr, Benseghier, Zeyd1 (AUTHOR), Philippe, Pierre1 (AUTHOR)
Source: Engineering Geology. Oct2019, Vol. 260, pN.PAG-N.PAG. 1p.
Subjects: Sinkholes, Lattice Boltzmann methods, Discrete element method, Soil cohesion, Soil erosion
Geographic Terms: Orléans (France)
Abstract: Groundwater is an aggravating factor in karstic sinkhole activity as it exacerbates infiltration, percolation, soil saturation and drainage. The exceptionally high number of ground collapses triggered during the major flood of spring 2016 in the Orléans region (France) clearly supports this assertion. In this article, we examine the role of flooding in sinkhole occurrence in cohesive soil layers covering karstified limestone rock. An innovative hydro-mechanical model is applied to simulated field scenarios. Our numerical simulations combine the Discrete Element Method (DEM) to model the solid phase with the Lattice Boltzmann Method (LBM) for the fluid phase. This coupled numerical method allows us to explore the micromechanical features of internal soil erosion in a flood situation. Three processes, consistent with field observations, are simulated and studied through phase diagrams: the formation of a stable cavity within the cover material, the upward propagation of a cavity leading to a dropout sinkhole, and the downward discharge of the granular media, called the subsidence sinkhole. In particular, we perform a parametric analysis of the dropout sinkhole that gives an estimate of the collapse width. In the first approximation, the characteristic length is shown to increase linearly with cover thickness, regardless of the other main parameters (soil cohesion, hydraulic head, system geometry). Finally, we present an exploratory experimental study, using sand with artificial cohesion that successfully reproduces different erosion regimes predicted by our numerical simulations. • Study case on flood-induced sinkholes during the 2016 meteorological event of Orléans area (France). • Numerical hydro-mechanical modeling of cohesive soil sinkholes based on field scenarios. • DEM-LBM method for micromechanical approach of internal erosion phenomenon. • Parametric analysis for dropout and subsidence sinkholes processes. • Experimental modeling of sinkhole formation using artificial cohesive materials. [ABSTRACT FROM AUTHOR]
Copyright of Engineering Geology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 139236380
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  Data: Hydro-mechanical modeling of sinkhole occurrence processes in covered karst terrains during a flood.
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  Data: <searchLink fieldCode="DE" term="%22Orléans+%28France%29%22">Orléans (France)</searchLink>
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  Label: Abstract
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  Data: Groundwater is an aggravating factor in karstic sinkhole activity as it exacerbates infiltration, percolation, soil saturation and drainage. The exceptionally high number of ground collapses triggered during the major flood of spring 2016 in the Orléans region (France) clearly supports this assertion. In this article, we examine the role of flooding in sinkhole occurrence in cohesive soil layers covering karstified limestone rock. An innovative hydro-mechanical model is applied to simulated field scenarios. Our numerical simulations combine the Discrete Element Method (DEM) to model the solid phase with the Lattice Boltzmann Method (LBM) for the fluid phase. This coupled numerical method allows us to explore the micromechanical features of internal soil erosion in a flood situation. Three processes, consistent with field observations, are simulated and studied through phase diagrams: the formation of a stable cavity within the cover material, the upward propagation of a cavity leading to a dropout sinkhole, and the downward discharge of the granular media, called the subsidence sinkhole. In particular, we perform a parametric analysis of the dropout sinkhole that gives an estimate of the collapse width. In the first approximation, the characteristic length is shown to increase linearly with cover thickness, regardless of the other main parameters (soil cohesion, hydraulic head, system geometry). Finally, we present an exploratory experimental study, using sand with artificial cohesion that successfully reproduces different erosion regimes predicted by our numerical simulations. • Study case on flood-induced sinkholes during the 2016 meteorological event of Orléans area (France). • Numerical hydro-mechanical modeling of cohesive soil sinkholes based on field scenarios. • DEM-LBM method for micromechanical approach of internal erosion phenomenon. • Parametric analysis for dropout and subsidence sinkholes processes. • Experimental modeling of sinkhole formation using artificial cohesive materials. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Engineering Geology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.enggeo.2019.105249
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      – Code: eng
        Text: English
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        PageCount: 1
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      – SubjectFull: Sinkholes
        Type: general
      – SubjectFull: Lattice Boltzmann methods
        Type: general
      – SubjectFull: Discrete element method
        Type: general
      – SubjectFull: Soil cohesion
        Type: general
      – SubjectFull: Soil erosion
        Type: general
      – SubjectFull: Orléans (France)
        Type: general
    Titles:
      – TitleFull: Hydro-mechanical modeling of sinkhole occurrence processes in covered karst terrains during a flood.
        Type: main
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            NameFull: Luu, Li-Hua
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            NameFull: Noury, Gildas
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            NameFull: Benseghier, Zeyd
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            NameFull: Philippe, Pierre
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            – D: 03
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              Text: Oct2019
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              Value: 260
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            – TitleFull: Engineering Geology
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