SIST EN ISO 12957-2:2025

SLOVENSKI STANDARD
01-marec-2025
Geosintetika - Ugotavljanje tornih značilnosti - 2. del: Preskus na nagnjeni ravnini
(ISO 12957-2:2024)
Geosynthetics - Determination of friction characteristics - Part 2: Inclined plane test (ISO
12957-2:2024)
Geokunststoffe - Bestimmung der Reibungseigenschaften - Teil 2: Schiefe-Ebene-
Versuch (ISO 12957-2:2024)
Géosynthétiques - Détermination des caractéristiques de frottement - Partie 2: Essai sur
plan incliné (ISO 12957-2:2024)
Ta slovenski standard je istoveten z: EN ISO 12957-2:2024
ICS:
59.080.70 Geotekstilije Geotextiles
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 12957-2
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2024
EUROPÄISCHE NORM
ICS 59.080.70 Supersedes EN ISO 12957-2:2005
English Version
Geosynthetics - Determination of friction characteristics -
Part 2: Inclined plane test (ISO 12957-2:2024)
Géosynthétiques - Détermination des caractéristiques Geokunststoffe - Bestimmung der
de frottement - Partie 2: Essai sur plan incliné (ISO Reibungseigenschaften - Teil 2: Schiefe-Ebene-Versuch
12957-2:2024) (ISO 12957-2:2024)
This European Standard was approved by CEN on 1 December 2024.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12957-2:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 12957-2:2024) has been prepared by Technical Committee ISO/TC 221
"Geosynthetics" in collaboration with Technical Committee CEN/TC 189 “Geosynthetics” the secretariat
of which is held by NBN.
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 June 2025, and conflicting national standards shall be
withdrawn at the latest by June 2025.
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 12957-2:2005.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 12957-2:2024 has been approved by CEN as EN ISO 12957-2:2024 without any
modification.
International
Standard
ISO 12957-2
Second edition
Geosynthetics — Determination of
2024-12
friction characteristics —
Part 2:
Inclined plane test
Géosynthétiques — Détermination des caractéristiques de
frottement —
Partie 2: Essai sur plan incliné
Reference number
ISO 12957-2:2024(en) © ISO 2024

ISO 12957-2:2024(en)
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 12957-2:2024(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Test specimens . 3
5.1 Sampling and preparation of test specimen .3
5.2 Number and dimensions of test specimens .3
6 Conditioning . 3
7 Apparatus . 3
7.1 General .3
7.2 Rigid base apparatus.3
7.2.1 Rigid base.3
7.2.2 Upper soil box.5
7.3 Soil filled base apparatus .6
7.3.1 Lower soil box .6
7.3.2 Upper soil box.7
7.4 Application of the normal force (for both types of apparatus).7
7.5 Soil .8
7.6 Calibration of the apparatus . .8
8 Procedure . 8
9 Calculations . 9
9.1 Apparatus with a roller supported upper box . .9
9.2 Apparatus with an upper box not supported on rollers .9
10 Test report . 10

iii
ISO 12957-2:2024(en)
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of 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 www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 221 Geosynthetics, in collaboration with
the European Committee for Standardization (CEN) Technical Committee CEN/TC 189, Geosynthetics, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 12957-2:2005) which has been technically
revised.
The main changes are as follows:
— minor modifications, notably in the terms and definitions;
— improvement of figures.
A list of all parts in the ISO 12957 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
International Standard ISO 12957-2:2024(en)
Geosynthetics — Determination of friction characteristics —
Part 2:
Inclined plane test
1 Scope
This document specifies a method to determine the friction characteristics of geosynthetics (geotextiles
and geotexti
...