Hydraulic stability evaluation of a diaphragm wall in granular soils recharged by an unconfined aquifer

Diaphragm walls are normally adopted for deep basements in granular soils because, among other reasons, they act as watertight retaining structures and can form part of the structure foundations. When the water table is high and the excavation is deep there is a likely risk of hydraulic stability pr...

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Autores principales:	Mozó,David, Oróstegui,Paulo, Villalobos,Felipe
Lenguaje:	English
Publicado:	Universidad Católica de la Santísima Concepción 2014
Materias:	diaphragm wall seepage piping factor of safety hydraulic gradient
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-28132014000100004
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spelling	oai:scielo:S0718-281320140001000042014-09-02Hydraulic stability evaluation of a diaphragm wall in granular soils recharged by an unconfined aquiferMozó,DavidOróstegui,PauloVillalobos,Felipe diaphragm wall seepage piping factor of safety hydraulic gradient Diaphragm walls are normally adopted for deep basements in granular soils because, among other reasons, they act as watertight retaining structures and can form part of the structure foundations. When the water table is high and the excavation is deep there is a likely risk of hydraulic stability problems. In this work two-dimensional flow nets around a diaphragm wall of 20 m depth and 0.8 m thickness are studied for different construction/ excavation stages. The water level behind the wall is the result of the excavation geometry, soil permeability and aquifer characteristics, i.e. a horizontal water level is not imposed. Using a commercial 2D steady flow software, distributions of velocities and hydraulic gradients are determined. Based on the definition of piping safety factor, a maximum excavation depth and a diaphragm wall minimum embedment are determined. Results using an isotropic coefficient of permeability value are compared with the anisotropic case. Hydrodynamic pressures over the wall are also determined and compared with hydrostatic pressures. Finally, it is pointed out that a minimum diaphragm wall embedment should be verified to avoid piping or erosion effects, which can be detrimental for the stability of the project during construction.info:eu-repo/semantics/openAccessUniversidad Católica de la Santísima ConcepciónObras y proyectos n.15 20142014-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-28132014000100004en10.4067/S0718-28132014000100004
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	diaphragm wall seepage piping factor of safety hydraulic gradient
spellingShingle	diaphragm wall seepage piping factor of safety hydraulic gradient Mozó,David Oróstegui,Paulo Villalobos,Felipe Hydraulic stability evaluation of a diaphragm wall in granular soils recharged by an unconfined aquifer
description	Diaphragm walls are normally adopted for deep basements in granular soils because, among other reasons, they act as watertight retaining structures and can form part of the structure foundations. When the water table is high and the excavation is deep there is a likely risk of hydraulic stability problems. In this work two-dimensional flow nets around a diaphragm wall of 20 m depth and 0.8 m thickness are studied for different construction/ excavation stages. The water level behind the wall is the result of the excavation geometry, soil permeability and aquifer characteristics, i.e. a horizontal water level is not imposed. Using a commercial 2D steady flow software, distributions of velocities and hydraulic gradients are determined. Based on the definition of piping safety factor, a maximum excavation depth and a diaphragm wall minimum embedment are determined. Results using an isotropic coefficient of permeability value are compared with the anisotropic case. Hydrodynamic pressures over the wall are also determined and compared with hydrostatic pressures. Finally, it is pointed out that a minimum diaphragm wall embedment should be verified to avoid piping or erosion effects, which can be detrimental for the stability of the project during construction.
author	Mozó,David Oróstegui,Paulo Villalobos,Felipe
author_facet	Mozó,David Oróstegui,Paulo Villalobos,Felipe
author_sort	Mozó,David
title	Hydraulic stability evaluation of a diaphragm wall in granular soils recharged by an unconfined aquifer
title_short	Hydraulic stability evaluation of a diaphragm wall in granular soils recharged by an unconfined aquifer
title_full	Hydraulic stability evaluation of a diaphragm wall in granular soils recharged by an unconfined aquifer
title_fullStr	Hydraulic stability evaluation of a diaphragm wall in granular soils recharged by an unconfined aquifer
title_full_unstemmed	Hydraulic stability evaluation of a diaphragm wall in granular soils recharged by an unconfined aquifer
title_sort	hydraulic stability evaluation of a diaphragm wall in granular soils recharged by an unconfined aquifer
publisher	Universidad Católica de la Santísima Concepción
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-28132014000100004
work_keys_str_mv	AT mozodavid hydraulicstabilityevaluationofadiaphragmwallingranularsoilsrechargedbyanunconfinedaquifer AT orosteguipaulo hydraulicstabilityevaluationofadiaphragmwallingranularsoilsrechargedbyanunconfinedaquifer AT villalobosfelipe hydraulicstabilityevaluationofadiaphragmwallingranularsoilsrechargedbyanunconfinedaquifer
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Hydraulic stability evaluation of a diaphragm wall in granular soils recharged by an unconfined aquifer

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