2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 1997-1, Eurocode 7: Geotechnical design — Part 1: General rules
EN 1997-2, Eurocode 7: Geotechnical design — Part 2: Ground investigation and testing
EN 13252:2000, Geotextiles and geotextile-related products — Characteristics required for use in drainage systems
EN ISO 9862, Geosynthetics — Sampling and preparation of test specimens (ISO 9862:2005)
EN ISO 10319, Geotextiles — Wide-width tensile test (ISO 10319:1993)
EN ISO 10320, Geotextiles and geotextile-related products — Identification on site (ISO 10320:1999)
EN ISO 10321, Geotextiles — Tensile test for joints/seams by wide-width method (ISO 10321:1992)
EN ISO 11058, Geotextiles and geotextile-related products — Determination of water permeability characteristics normal to the plane, without load (ISO 11058:1999)
EN ISO 12956, Geotextiles and geotextile-related products — Determination of the characteristic opening size (ISO 12956:1999)
EN ISO 12958:1999, Geotextiles and geotextile-related products — Determination of water flow capacity in their plane (ISO 12958:1999)
EN ISO 14688 (all parts), Geotechnical investigation and testing
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
auger installation method
fr: installation à la tarière
de: Schneckeneinbauverfahren
installation method of sand drains by means of screw type auger or continuous flight hollow stem auger
3.2
band drain1)
fr: drain plat
de: Streifendrän
prefabricated drain with a rectangular cross-section, usually consisting of a central core with a channel system surrounded by a filter sleeve
3.3
cylindrical prefabricated drain
fr: drain tubulaire
de: zylindrischer Drän
drain consisting of an annular-corrugated and perforated open core, surrounded by a filter sock
3.4
discharge capacity qw
fr: capacité de décharge
de: Durchflusskapazität
discharge capacity of a drain well is equal to the cross-sectional area of the drain multiplied by its overall permeability in longitudinal direction (the volume of water which flows out of the drain per time unit under a hydraulic gradient equal to unity)
3.5
displacement installation method
fr: installation par fonçage refoulant
de: Verdrängungseinbauverfahren
installation method of drains by means of a closed-end steel tube/mandrel
3.6
drain anchor
fr: sabot d’ancrage
de: Dränschuh
anchor fixed at the end of band drains before installation and which prevents soil from intruding into the mandrel during installation and the band drain from being dragged up when the mandrel is withdrawn
3.7
drainage blanket
fr: tapis drainant
de: Drändecke
upper high-permeability drainage layer, which has good contact with the drains and prevents the creation of backpressure in the drains
3.8
dynamic installation method
fr: méthode d’installation par battage ou vibrofonçage
de: dynamische Dräneinbauweise
drain installation method using dynamic action (impact or vibratory hammer)
3.9
geotextile enclosed sand drain
fr: drains de sable dans une gaine de géotextile
de: geotextilumschlossener Sanddrän
sand drains enclosed in some type of filter fabric made of geotextile
3.10
jet installation method
fr: méthode d´installation par lançage
de: Einbau mittels Hochdruckinjektion
installation method of sand drains by means of internal jetting or rotary jet
3.11
sand drain
fr: drain de sable
de: Sanddrän
drain with circular cross-section, built up of granular material (sand, gravel) with high permeability
3.12
static installation method
fr: méthode d´installation par fonçage
de: statisches Einbauverfahren
drain installation method by means of static load (pushing)
3.13
vibro installation method
fr: méthode d´installation par vibrofonçage
de: Vibrationseinbauverfahren
installation method of sand drains by means of a top vibrator mounted on a hollow mandrel or by a depth vibrator
3.14
working platform
fr: plateforme de travail
de: Arbeitsebene
platform created for access of the drain installation machines to the location of the vertical drains
