NDLI: Multi-aquifer pumping test to determine cutoff wall length for groundwater flow control during site excavation in Tokyo, Japan

Content Provider	Springer Nature Link
Author	Miyake, riharu Kohsaka, buaki Ishikawa, Akira
Copyright Year	2008
Abstract	Multi-aquifer pumping tests, using a multi-screen pumping well and multi-level piezometers, were carried out for groundwater flow control in a large-scale excavation site in Tokyo, Japan. The site was underlain by multi-layered confined aquifers. In the tests, pumping was carried out using a multi-aquifer pumping well in which a screen depth was chosen arbitrarily. Changes in groundwater pressure heads in each aquifer were measured at each screen position of the multi-aquifer pumping well. Hydraulic conductivity (K) and specific storage (S $_{s}$) of not only aquifers, but also for low permeability layers between the aquifers, were estimated using the Cooper-Jacob method, and calibrated by a finite element method (FEM) groundwater model. Four different cutoff wall lengths were assumed for final excavation depth, and correlations among wall length, pumping discharge and drawdown at the back of the cutoff wall were obtained from simulations using the K and S $_{s}$ parameters in the FEM model. Then, the most suitable wall length was selected based on the simulated correlations considering environmental condition, construction period and cost of the cutoff wall.Des essais de pompage sur plusieurs aquifères ont été réalisés à l’aide d’un puits de pompage équipé de plusieurs zones crépinées et de piézomètres mesurant des niveaux différents, afin de contrôler l’écoulement des eaux souterraines au niveau d’un grand site d’excavation à Tokyo au Japon. Le site recouvre des aquifères captifs multi-couches. Pour les tests, le pompage a été effectué en utilisant un puits de pompage multi-aquifères dans lequel la profondeur de la crépine a été choisi arbitrairement. Les changements des niveaux piézomètriques de l’eau souterraine dans chaque aquifère ont été mesurés pour chaque position de la crépine du puits de pompage multi-aquifères. Les valeurs de conductivité hydraulique (K) et d’emmagasinement (S $_{s}$) des aquifères, mais aussi celles des couches à faibles perméabilités situées entre les aquifères, ont été estimées en utilisant la méthode de Cooper-Jacob, et calibrées dans un modèle hydrogéologique aux éléments finis (FEM en anglais). Quatre longueurs différentes de mur de tranchée ont été envisagées pour la profondeur finale de l’excavation, et les corrélations entre la longueur du mur, le débit de pompage et le rabattement en arrière du mur ont été obtenues à partir de simulations utilisant les valeurs de K et de S $_{s}$ du modèle aux éléments finis. Puis, la longueur du mur de tranchée la mieux adaptée a été sélectionnée en fonction des corrélations simulées en prenant en compte les conditions environnementales, la période de construction et le coût du mur de tranchée.Se han llevado a cabo ensayos de bombeo en acuíferos multicapa, utilizando bombeos en pozos con varias rejillas y piezómetros multicapa, para controlar el flujo de agua subterránea en una excavación a gran escala en Tokio, Japón. El lugar estaba conformado por acuíferos confinados multi-capa. En los ensayos, el bombeo se llevó a cabo utilizando el bombeo en un pozo multiacuífero en el que la profundidad de la rejilla fue elegida arbitrariamente. Se midieron los cambios en las presiones de cada acuífero en cada posición de la rejilla en el pozo de bombeo multiacuífero. Se estimó la conductividad hidráulica (K) y el coeficiente de almacenamiento (S $_{s}$) no solamente de los acuíferos, sino también de las capas de baja permeabilidad entre los acuíferos, mediante el método de Cooper-Jacob, y se calibró un modelo de aguas subterráneas de elementos finitos (FEM). Cuatro muros de corte de diferente longitud fueron supuestos para la profundidad final de la excavación, y se obtuvieron correlaciones entre la longitud del muro, la descarga del bombeo y el descenso en la parte trasera del muro de corte fueron obtenidos a partir de simulaciones utilizando parámetros de K y S $_{s}$ en el modelo FEM. Entonces, se seleccionó la longitud de muro más conveniente basado en las correlaciones simuladas considerando la condición ambiental, el periodo de construcción y los costes del muro de corte.
Starting Page	995
Ending Page	1001
Page Count	7
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	16
Issue Number	5
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-01-29
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cutoff wall Groundwater exploration Pumping test Groundwater flow Japan Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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