View in EDS

Bias in hydraulic head measurements from multilevel vibrating-wire piezometers with excessively permeable backfill.

Saved in:
Bibliographic Details
Title: Bias in hydraulic head measurements from multilevel vibrating-wire piezometers with excessively permeable backfill.
Alternate Title: Desviación en las mediciones de la carga hidráulica de los piezómetros de cuerda vibrante multinivel con un revestimiento excesivamente permeable.
Biais dans les mesures des charges hydrauliques dans des piézomètres à fils vibrants multi-niveaux avec un remblai excessivement perméable.
Viés em medições de carga hidráulica a partir de piezômetros de fio vibratório multinível com preenchimento excessivamente permeável.
过度渗透性回填的多级振弦式压力计水位测量的偏差.
Authors: Young, Nathan L.1,2,3 (AUTHOR) nathan-lee.young.1@ulaval.ca, Lemieux, Jean-Michel1,2,3 (AUTHOR) Jean-Michel.Lemieux@ggl.ulaval.ca, Locat, Pascal4 (AUTHOR), Demers, Denis4 (AUTHOR), Delottier, Hugo1,5 (AUTHOR), Mony, Laura1,6 (AUTHOR)
Source: Hydrogeology Journal. Jun2022, Vol. 30 Issue 4, p1337-1344. 8p.
Subjects: Hydraulic measurements, Cephalometry, Hydraulic circuits, Crushed stone, Hydraulic conductivity, Bentonite, Hydrogeology, Stone implements
Geographic Terms: Québec (Québec)
Abstract (English): An extensive network of multilevel vibrating-wire piezometers (VWP) was recently created to monitor the spatial and temporal variation of pore pressure (and hydraulic head) in the landslide-prone post-glacial marine clay slopes in Québec, Canada. Some of the VWP installations used well-sorted crushed stone as well backfill between bentonite plugs, instead of bentonite pellets or cement-bentonite grout, which could cause a bias in the hydraulic head measurements due to preferential flow within the backfill (i.e., a hydraulic short circuit). This study uses steady-state two-dimensional radial-coordinate numerical models to quantify the extent of this potential bias, and focuses on the relative importance of the following components: hydraulic conductivity of the crushed stone, length of the backfill intervals, length of the bentonite plugs, magnitude and direction of the vertical gradient, and the degree of vertical and horizontal anisotropy within the clay. Simulation results show that the use of crushed stone as backfill results in measurements of hydraulic head that differ from undisturbed conditions by ±0.25 to ±210 cm, regardless of the values assigned to the parameters of interest. In all cases, the cause of this bias is a series of hydraulic short circuits resulting from preferential flow through the crushed stone intervals. [ABSTRACT FROM AUTHOR]
Abstract (Spanish): Resumen: Recientemente se ha creado una amplia red de piezómetros de cuerda vibrante (VWP) de varios niveles para monitorear la variación espacial y temporal de la presión de los poros (y la carga hidráulica) en los taludes de arcilla marina postglacial susceptibles de deslizamiento en Québec, Canadá. Algunas de las instalaciones del VWP utilizaron como revestimiento del pozo grava bien clasificada entre los obturadores de bentonita, en lugar de granulados de bentonita o lechadas de cemento-bentonita, lo que podría causar un sesgo en las mediciones de la carga hidráulica debido al flujo preferencial dentro del revestimiento (es decir, un cortocircuito hidráulico). Este estudio utiliza modelos numéricos bidimensionales de coordenadas radiales en estado estacionario para cuantificar el alcance de esta posible desviación, y se centra en la importancia relativa de los siguientes componentes: la conductividad hidráulica de la grava, la longitud de los intervalos de revestimiento, la longitud de los obturadores de bentonita, la magnitud y la dirección del gradiente vertical, y el grado de anisotropía vertical y horizontal dentro de la arcilla. Los resultados de la simulación muestran que el uso de grava como revestimiento da lugar a mediciones de carga hidráulica que difieren de las condiciones inalteradas entre ±0.25 y ± 210 cm, independientemente de los valores asignados a los parámetros de interés. En todos los casos, la causa de esta desviación es una serie de cortocircuitos hidráulicos resultantes del flujo preferencial a través de los intervalos de grava. [ABSTRACT FROM AUTHOR]
Abstract (French): Résumé: Un vaste réseau de piézomètres à fil vibrant (VWP) à plusieurs niveaux a récemment été créé pour surveiller la variation spatiale et temporelle de la pression interstitielle (et de la charge hydraulique) dans les pentes d'argile marine postglaciaire sujettes aux glissements de terrain au Québec, Canada. Certaines des installations VWP ont utilisé de la pierre concassée bien triée comme remblai entre les bouchons de bentonite, au lieu de granulés de bentonite ou de coulis de ciment-bentonite, ce qui pourrait causer un biais des mesures de la charge hydraulique en raison d'un écoulement préférentiel dans le remblai (c'est-à-dire un court-circuit hydraulique). Cette étude utilise des modèles numériques bidimensionnels à coordonnées radiales en régime permanent pour quantifier l'étendue de ce biais potentiel, et se concentre sur l'importance relative des composants suivants: conductivité hydraulique de la pierre concassée, longueur des intervalles de remblai, longueur des bouchons de bentonite, ampleur et direction du gradient vertical, et degré d'anisotropie verticale et horizontale dans l'argile. Les résultats des simulations montrent que l'utilisation de pierre concassée comme remblai entraîne des mesures de la charge hydraulique qui diffèrent des conditions non perturbées de ±0.25 à ±210 cm, quelles que soient les valeurs attribuées aux paramètres d'intérêt. Dans tous les cas, la cause de ce biais est une série de courts-circuits hydrauliques dus à un écoulement préférentiel à travers les intervalles de pierre concassée. [ABSTRACT FROM AUTHOR]
Abstract (Portuguese): Resumo: Uma rede extensa de piezômetros de fio vibratório (PFV) foi criada recentemente para monitorar a variação espacial e temporal da pressão de poro (e carga hidráulica) em encostas de argila marinha pós-glacial propensas a deslizamentos de terra em Québec, Canadá. Algumas das instalações de PFV usaram pedra britada bem sortida e preenchimento entre os tampões de bentonita, ao invés de pellets de bentonita ou argamassa de cimento-bentonita, o que pode causar um viés nas medidas de condutividade hidráulica devido ao fluxo preferencial dentro do preenchimento (p. ex., um curto-circuito hidráulico). Este estudo usa modelos numéricos de coordenadas radiais, bidimensional, em regime permanente, para quantificar a extensão desse viés potencial e foca na importância relativa dos seguintes componentes: condutividade hidráulica da pedra britada, comprimento dos intervalos de preenchimento, comprimento dos tampões de bentonita, magnitude e direção do gradiente vertical e grau de anisotropia horizontal e vertical dentro da argila. Os resultados da simulação mostram que o uso de pedra britada como preenchimento resulta em medições de condutividade hidráulica que diferem das condições indeformadas em ±0.25 até 210 cm, independentemente dos valores atribuídos aos parâmetros de interesse. Em todos os casos, a causa do viés é a série de curtos-circuitos hidráulicos resultantes do fluxo preferencial através dos intervalos de pedra britada. [ABSTRACT FROM AUTHOR]
Abstract (Chinese): 摘要: 最近创建了一个多级振弦式压力计(VWP)的广泛网络, 用于监测加拿大魁北克省易发生滑坡的冰后海相粘土斜坡的孔隙压力(和水位)的时空变化。一些 VWP 装置使用分选良好的碎石以及膨润土塞之间的回填, 而不是膨润土颗粒或水泥-膨润土灌浆, 由于回填物中的优先流动(即水力短路)。本研究使用稳定二维径向数值模型来量化这种潜在偏差的程度, 并重点关注以下影响因素的相对重要性:碎石的渗透系数、回填间隔的长度、膨润土塞, 垂向梯度的大小和方向, 以及粘土内的垂向和水平各向异性程度。模拟结果表明, 无论分配给相关参数的值如何, 使用碎石作为回填物会导致水头测量值与未受干扰的条件相差 ±0.25至 ±210 cm。在所有情况下, 这种偏差的原因是由于优先流过碎石层段而导致的一系列液压短路。 [ABSTRACT FROM AUTHOR]
Copyright of Hydrogeology Journal is the property of Springer Nature 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
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 158112756
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Bias in hydraulic head measurements from multilevel vibrating-wire piezometers with excessively permeable backfill.
– Name: TitleAlt
  Label: Alternate Title
  Group: TiAlt
  Data: Desviación en las mediciones de la carga hidráulica de los piezómetros de cuerda vibrante multinivel con un revestimiento excesivamente permeable.<br />Biais dans les mesures des charges hydrauliques dans des piézomètres à fils vibrants multi-niveaux avec un remblai excessivement perméable.<br />Viés em medições de carga hidráulica a partir de piezômetros de fio vibratório multinível com preenchimento excessivamente permeável.<br />过度渗透性回填的多级振弦式压力计水位测量的偏差.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Young%2C+Nathan+L%2E%22">Young, Nathan L.</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<i> nathan-lee.young.1@ulaval.ca</i><br /><searchLink fieldCode="AR" term="%22Lemieux%2C+Jean-Michel%22">Lemieux, Jean-Michel</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<i> Jean-Michel.Lemieux@ggl.ulaval.ca</i><br /><searchLink fieldCode="AR" term="%22Locat%2C+Pascal%22">Locat, Pascal</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Demers%2C+Denis%22">Demers, Denis</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Delottier%2C+Hugo%22">Delottier, Hugo</searchLink><relatesTo>1,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mony%2C+Laura%22">Mony, Laura</searchLink><relatesTo>1,6</relatesTo> (AUTHOR)
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Hydrogeology+Journal%22">Hydrogeology Journal</searchLink>. Jun2022, Vol. 30 Issue 4, p1337-1344. 8p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Hydraulic+measurements%22">Hydraulic measurements</searchLink><br /><searchLink fieldCode="DE" term="%22Cephalometry%22">Cephalometry</searchLink><br /><searchLink fieldCode="DE" term="%22Hydraulic+circuits%22">Hydraulic circuits</searchLink><br /><searchLink fieldCode="DE" term="%22Crushed+stone%22">Crushed stone</searchLink><br /><searchLink fieldCode="DE" term="%22Hydraulic+conductivity%22">Hydraulic conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Bentonite%22">Bentonite</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrogeology%22">Hydrogeology</searchLink><br /><searchLink fieldCode="DE" term="%22Stone+implements%22">Stone implements</searchLink>
– Name: SubjectGeographic
  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Québec+%28Québec%29%22">Québec (Québec)</searchLink>
– Name: Abstract
  Label: Abstract (English)
  Group: Ab
  Data: An extensive network of multilevel vibrating-wire piezometers (VWP) was recently created to monitor the spatial and temporal variation of pore pressure (and hydraulic head) in the landslide-prone post-glacial marine clay slopes in Québec, Canada. Some of the VWP installations used well-sorted crushed stone as well backfill between bentonite plugs, instead of bentonite pellets or cement-bentonite grout, which could cause a bias in the hydraulic head measurements due to preferential flow within the backfill (i.e., a hydraulic short circuit). This study uses steady-state two-dimensional radial-coordinate numerical models to quantify the extent of this potential bias, and focuses on the relative importance of the following components: hydraulic conductivity of the crushed stone, length of the backfill intervals, length of the bentonite plugs, magnitude and direction of the vertical gradient, and the degree of vertical and horizontal anisotropy within the clay. Simulation results show that the use of crushed stone as backfill results in measurements of hydraulic head that differ from undisturbed conditions by ±0.25 to ±210 cm, regardless of the values assigned to the parameters of interest. In all cases, the cause of this bias is a series of hydraulic short circuits resulting from preferential flow through the crushed stone intervals. [ABSTRACT FROM AUTHOR]
– Name: Abstract
  Label: Abstract (Spanish)
  Group: Ab
  Data: Resumen: Recientemente se ha creado una amplia red de piezómetros de cuerda vibrante (VWP) de varios niveles para monitorear la variación espacial y temporal de la presión de los poros (y la carga hidráulica) en los taludes de arcilla marina postglacial susceptibles de deslizamiento en Québec, Canadá. Algunas de las instalaciones del VWP utilizaron como revestimiento del pozo grava bien clasificada entre los obturadores de bentonita, en lugar de granulados de bentonita o lechadas de cemento-bentonita, lo que podría causar un sesgo en las mediciones de la carga hidráulica debido al flujo preferencial dentro del revestimiento (es decir, un cortocircuito hidráulico). Este estudio utiliza modelos numéricos bidimensionales de coordenadas radiales en estado estacionario para cuantificar el alcance de esta posible desviación, y se centra en la importancia relativa de los siguientes componentes: la conductividad hidráulica de la grava, la longitud de los intervalos de revestimiento, la longitud de los obturadores de bentonita, la magnitud y la dirección del gradiente vertical, y el grado de anisotropía vertical y horizontal dentro de la arcilla. Los resultados de la simulación muestran que el uso de grava como revestimiento da lugar a mediciones de carga hidráulica que difieren de las condiciones inalteradas entre ±0.25 y ± 210 cm, independientemente de los valores asignados a los parámetros de interés. En todos los casos, la causa de esta desviación es una serie de cortocircuitos hidráulicos resultantes del flujo preferencial a través de los intervalos de grava. [ABSTRACT FROM AUTHOR]
– Name: Abstract
  Label: Abstract (French)
  Group: Ab
  Data: Résumé: Un vaste réseau de piézomètres à fil vibrant (VWP) à plusieurs niveaux a récemment été créé pour surveiller la variation spatiale et temporelle de la pression interstitielle (et de la charge hydraulique) dans les pentes d'argile marine postglaciaire sujettes aux glissements de terrain au Québec, Canada. Certaines des installations VWP ont utilisé de la pierre concassée bien triée comme remblai entre les bouchons de bentonite, au lieu de granulés de bentonite ou de coulis de ciment-bentonite, ce qui pourrait causer un biais des mesures de la charge hydraulique en raison d'un écoulement préférentiel dans le remblai (c'est-à-dire un court-circuit hydraulique). Cette étude utilise des modèles numériques bidimensionnels à coordonnées radiales en régime permanent pour quantifier l'étendue de ce biais potentiel, et se concentre sur l'importance relative des composants suivants: conductivité hydraulique de la pierre concassée, longueur des intervalles de remblai, longueur des bouchons de bentonite, ampleur et direction du gradient vertical, et degré d'anisotropie verticale et horizontale dans l'argile. Les résultats des simulations montrent que l'utilisation de pierre concassée comme remblai entraîne des mesures de la charge hydraulique qui diffèrent des conditions non perturbées de ±0.25 à ±210 cm, quelles que soient les valeurs attribuées aux paramètres d'intérêt. Dans tous les cas, la cause de ce biais est une série de courts-circuits hydrauliques dus à un écoulement préférentiel à travers les intervalles de pierre concassée. [ABSTRACT FROM AUTHOR]
– Name: Abstract
  Label: Abstract (Portuguese)
  Group: Ab
  Data: Resumo: Uma rede extensa de piezômetros de fio vibratório (PFV) foi criada recentemente para monitorar a variação espacial e temporal da pressão de poro (e carga hidráulica) em encostas de argila marinha pós-glacial propensas a deslizamentos de terra em Québec, Canadá. Algumas das instalações de PFV usaram pedra britada bem sortida e preenchimento entre os tampões de bentonita, ao invés de pellets de bentonita ou argamassa de cimento-bentonita, o que pode causar um viés nas medidas de condutividade hidráulica devido ao fluxo preferencial dentro do preenchimento (p. ex., um curto-circuito hidráulico). Este estudo usa modelos numéricos de coordenadas radiais, bidimensional, em regime permanente, para quantificar a extensão desse viés potencial e foca na importância relativa dos seguintes componentes: condutividade hidráulica da pedra britada, comprimento dos intervalos de preenchimento, comprimento dos tampões de bentonita, magnitude e direção do gradiente vertical e grau de anisotropia horizontal e vertical dentro da argila. Os resultados da simulação mostram que o uso de pedra britada como preenchimento resulta em medições de condutividade hidráulica que diferem das condições indeformadas em ±0.25 até 210 cm, independentemente dos valores atribuídos aos parâmetros de interesse. Em todos os casos, a causa do viés é a série de curtos-circuitos hidráulicos resultantes do fluxo preferencial através dos intervalos de pedra britada. [ABSTRACT FROM AUTHOR]
– Name: Abstract
  Label: Abstract (Chinese)
  Group: Ab
  Data: 摘要: 最近创建了一个多级振弦式压力计(VWP)的广泛网络, 用于监测加拿大魁北克省易发生滑坡的冰后海相粘土斜坡的孔隙压力(和水位)的时空变化。一些 VWP 装置使用分选良好的碎石以及膨润土塞之间的回填, 而不是膨润土颗粒或水泥-膨润土灌浆, 由于回填物中的优先流动(即水力短路)。本研究使用稳定二维径向数值模型来量化这种潜在偏差的程度, 并重点关注以下影响因素的相对重要性:碎石的渗透系数、回填间隔的长度、膨润土塞, 垂向梯度的大小和方向, 以及粘土内的垂向和水平各向异性程度。模拟结果表明, 无论分配给相关参数的值如何, 使用碎石作为回填物会导致水头测量值与未受干扰的条件相差 ±0.25至 ±210 cm。在所有情况下, 这种偏差的原因是由于优先流过碎石层段而导致的一系列液压短路。 [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Hydrogeology Journal is the property of Springer Nature 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.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=158112756
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1007/s10040-022-02480-x
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 8
        StartPage: 1337
    Subjects:
      – SubjectFull: Hydraulic measurements
        Type: general
      – SubjectFull: Cephalometry
        Type: general
      – SubjectFull: Hydraulic circuits
        Type: general
      – SubjectFull: Crushed stone
        Type: general
      – SubjectFull: Hydraulic conductivity
        Type: general
      – SubjectFull: Bentonite
        Type: general
      – SubjectFull: Hydrogeology
        Type: general
      – SubjectFull: Stone implements
        Type: general
      – SubjectFull: Québec (Québec)
        Type: general
    Titles:
      – TitleFull: Bias in hydraulic head measurements from multilevel vibrating-wire piezometers with excessively permeable backfill.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Young, Nathan L.
      – PersonEntity:
          Name:
            NameFull: Lemieux, Jean-Michel
      – PersonEntity:
          Name:
            NameFull: Locat, Pascal
      – PersonEntity:
          Name:
            NameFull: Demers, Denis
      – PersonEntity:
          Name:
            NameFull: Delottier, Hugo
      – PersonEntity:
          Name:
            NameFull: Mony, Laura
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 06
              Text: Jun2022
              Type: published
              Y: 2022
          Identifiers:
            – Type: issn-print
              Value: 14312174
          Numbering:
            – Type: volume
              Value: 30
            – Type: issue
              Value: 4
          Titles:
            – TitleFull: Hydrogeology Journal
              Type: main
ResultId 1