Communication science et technologie
Volume 9, Numéro 1, Pages 25-32
2011-01-01

Effet Tridimensionnel De L'écoulement Souterrain Sur La Stabilité Des Ouvrages En Sites Urbanisés Application Aux Batardeaux Carrés En Milieu Semi-infini.



Auteurs : Farid Boucheighoum . N. Benmebarek . S. Benmebarek . R. Kastner .

Résumé

A water presence in soil represents a factor of hindrance or interest according to the engineer's preoccupations. ln some cases, a problem is about exploitation of resources by withdrawals of groundwater; and in others it can be about exhausting an excavation before underground works. This study is devoted therefore to three-dimensional effect of problems met with, dewatering on deep excavation of square shape excavation within semi-infinite media in permeable soils and urbanised sites in the vicinity of existing buildings. ln the first part, we deal with problems of dewatering excavations protected by cut-offwalls: pumping flow forecasting and head loss. The numerical study in three-dimensional of these groundwater jlows (realised with Flac3D code) has permitted to propose a set of simplified method for evaluation of jlow out-skirting cui off walls. The second part is devoted to study a piping phenomenon that these groundwater jlows can induce and that appears in shape of subsurface erosion or bulk heave.

Mots clés

Three-dimensional groundwater flow, Square deep excavation, Semi-Infinite media, Piping, Boiling, Heaving.

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