EN ISO 14688-2:2018

SLOVENSKI STANDARD
01-april-2018
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SIST EN ISO 14688-2:2004
SIST EN ISO 14688-2:2004/A1:2013
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Geotechnical investigation and testing - Identification and classification of soil - Part 2:
Principles for a classification (ISO 14688-2:2017)
Geotechnische Erkundung und Untersuchung - Benennung, Beschreibung und
Klassifizierung von Boden - Teil 2: Grundlagen für Bodenklassifizierungen (ISO 14688-
2:2017)
Reconnaissance et essais géotechniques - Identification et classification des sols - Partie
2: Principes pour une classification (ISO 14688-2:2017)
Ta slovenski standard je istoveten z: EN ISO 14688-2:2018
ICS:
13.080.05 Preiskava tal na splošno Examination of soils in
general
93.020 Zemeljska dela. Izkopavanja. Earthworks. Excavations.
Gradnja temeljev. Dela pod Foundation construction.
zemljo Underground works
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 14688-2
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2018
EUROPÄISCHE NORM
ICS 13.080.05; 93.020 Supersedes EN ISO 14688-2:2004
English Version
Geotechnical investigation and testing - Identification and
classification of soil - Part 2: Principles for a classification
(ISO 14688-2:2017)
Reconnaissance et essais géotechniques - Identification Geotechnische Erkundung und Untersuchung -
et classification des sols - Partie 2: Principes pour une Benennung, Beschreibung und Klassifizierung von
classification (ISO 14688-2:2017) Boden - Teil 2: Grundlagen für Bodenklassifizierungen
(ISO 14688-2:2017)
This European Standard was approved by CEN on 20 November 2017.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 14688-2:2018 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 14688-2:2018) has been prepared by Technical Committee ISO/TC 182
“Geotechnics” in collaboration with Technical Committee CEN/TC 341 “Geotechnical Investigation and
Testing” the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by August 2018, and conflicting national standards shall
be withdrawn at the latest by August 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 14688-2:2004.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 14688-2:2017 has been approved by CEN as EN ISO 14688-2:2018 without any
modification.
INTERNATIONAL ISO
STANDARD 14688-2
Second edition
2017-12
Geotechnical investigation and
testing — Identification and
classification of soil —
Part 2:
Principles for a classification
Reconnaissance et essais géotechniques — Identification et
classification des sols —
Partie 2: Principes pour une classification
Reference number
ISO 14688-2:2017(E)
©
ISO 2017
ISO 14688-2:2017(E)
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved

ISO 14688-2:2017(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2  Normative references . 1
3  Terms and definitions . 2
4  Principles of soil classifications . 4
4.1 General . 4
4.2 Particle size fractions . 6
4.3 Particle size distribution (grading) . 6
4.4 Plasticity . 6
4.5 Organic content . 7
4.6 Carbonate content . 8
5  Other principles suitable for soil classification . 8
5.1 General . 8
5.2 Correlations of relative density terms for coarse soils . 8
5.3 Undrained shear strength of fine soils . 9
5.4 Sensitivity . 9
5.5 Consistency index . 9
5.6 Other parameters.10
Bibliography .11
ISO 14688-2:2017(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 182, Geotechnics.
This second edition cancels and replaces the first edition (ISO 14688-2:2004), which has been
technically revised. It also incorporates the Amendment ISO 14688-2:2004/Amd 1:2013.
A list of all parts in the ISO 14688 series can be found on the ISO website.
iv © ISO 2017 – All rights reserved

ISO 14688-2:2017(E)
Introduction
This document gives the means by which soils can be classified into groups of similar composition
and geotechnical properties based on the results of field and laboratory tests with respect to their
suitability for geotechnical engineering purposes.
Prior to classification, ISO 14688-1 gives details of the procedures that should be followed in the
identification and description of soils.
INTERNATIONAL STANDARD ISO 14688-2:2017(E)
Geotechnical investigation and testing — Identification and
classification of soil —
Part 2:
Principles for a classification
1 Scope
This document specifies the basic principles for classification of those material characteristics
most commonly used for soils for engineering purposes. It is intended to be read in conjunction
with ISO 14688-1, which gives rules for the identification and description of soils. The relevant
characteristics could vary and therefore, for particular projects or materials, more detailed subdivisions
of the descriptive and classification terms could be appropriate. Due to differences in local geological
conditions, practices to enhance relevant classification criteria are used.
The classification principles established in this document allow soils to be classified into groups of
similar composition and geotechnical properties, based on the results of field and laboratory tests with
respect to their suitability for geotechnical engineering purposes.
This document is applicable to natural soil in situ, natural soil reworked artificially and synthetic
materials. A more detailed classification specific to use in earthworks is given in EN 16907-2.
NOTE 1 Identification and description of rocks are covered by ISO 14689. Identification and description of
materials intermediate between soil and rock are carried out using the procedures in ISO 14688-1, this document
and ISO 14689, as appropriate.
NOTE 2 The identification and classification of soil for pedological purposes, as well as in the framework of
measurements for soil protection and for remediation of contaminated areas, is covered by ISO 25177.
2  Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
ISO 14688-1:2017, Geotechnical investigation and testing — Identification and classification of soil —
Part 1: Identification and description
ISO 14689, Geotechnical investigation and testing — Identification, description and classification of rock
ISO 17892-1, Geotechnical investigation and testing — Laboratory testing of soil — Part 1: Determination
of water content
ISO 17892-2, Geotechnical investigation and testing — Laboratory testing of soil — Part 2: Determination
of bulk density
ISO 17892-3, Geotechnical investigation and testing — Laboratory testing of soil — Part 3: Determination
of particle density
ISO 17892-4, Geotechnical investigation and testing — Laboratory testing of soil — Part 4: Determination
of particle size distribution
ISO 17892-5, Geotechnical investigation and testing — Labo
...