ISO 22476-11:2017 PDF

Scope: This document establishes guidelines for the equipment requirements, execution of and reporting on flat dilatometer tests. NOTE This document fulfils the requirements for flat dilatometer tests as part of the geotechnical investigation and testing according to EN 1997-1 and EN 1997-2. The basic flat dilatometer test consists of inserting vertically into the soil a blade-shaped steel probe with a thin expandable circular steel membrane mounted flush on one face and determining two pressures at selected depth intervals: the contact pressure exerted by the soil against the membrane when the membrane is flush with the blade and, subsequently, the pressure exerted when the central displacement of the membrane reaches 1,10 mm. Results of flat dilatometer tests are used mostly to obtain information on soil stratigraphy, in situ state of stress, deformation properties and shear strength. It is also used to detect slip surfaces in clays. The flat dilatometer test is most applicable to clays, silts and sands, where particles are small compared to the size of the membrane.

ISO 22476-11:2017 Referenced Document

EN 1997-1:2004 Eurocode 7 - Geotechnical design - Part 1: General rules*， 2024-04-20 Update
EN 1997-2:2007 Eurocode 7 - Geotechnical design - Part 2: Ground investigation and testing
ISO 22476-1:2012 Geotechnical investigation and testing - Field testing - Part 1: Electrical cone and piezocone penetration test

2017 ISO 22476-11:2017 Geotechnical investigation and testing - Field testing - Part 11: Flat dilatometer test