Geotechnical investigation and testing - Laboratory testing of soil - Part 8: Unconsolidated undrained triaxial test (ISO 17892-8:2018)

This document specifies a method for unconsolidated undrained triaxial compression tests.
This document is applicable to the laboratory determination of undrained triaxial shear strength under
compression loading within the scope of geotechnical investigations.
The cylindrical specimen, which can comprise undisturbed, re-compacted, remoulded or reconstituted
soil, is subjected to an isotropic stress under undrained conditions and thereafter is sheared
under undrained conditions. The test allows the determination of shear strength and stress-strain
relationships in terms of total stresses.
Non-standard procedures such as tests with the measurement of pore pressure or tests with filter
drains are not covered in this document.
NOTE This document fulfils the requirements of unconsolidated undrained triaxial compression tests for
geotechnical investigation and testing in accordance with EN 1997-1 and EN 1997-2.

Geotechnische Erkundung und Untersuchung - Laborversuche an Bodenproben - Teil 8: Unkonsolidierter undränierter Triaxialversuch (ISO 17892-8:2018)

Dieses Dokument legt ein Verfahren für den unkonsolidierten undränierten Triaxialversuch fest.
Dieses Dokument gilt für die Bestimmung der undränierten triaxialen Scherfestigkeit unter Verformung innerhalb des Anwendungsbereichs geotechnischer Untersuchungen im Labor.
Der zylindrische Probekörper, der ungestörten, verfestigten, gestörten oder wiederaufbereiteten Boden enthalten kann, wird einer isotropen Spannung unter undränierten Bedingungen ausgesetzt und wird anschließend unter undränierten Bedingungen abgeschert. Die Prüfung ermöglicht die Bestimmung der Scherfestigkeit und der Spannungs-Dehnungs-Beziehungen in Bezug auf die Total¬spannung.
Nicht genormte Verfahren wie Prüfungen mit Messungen von Porenwasserdruck oder Prüfungen mit Filterdrainagen werden von diesem Dokument nicht abgedeckt.
ANMERKUNG   Dieses Dokument erfüllt die Anforderungen an unkonsolidierte Triaxialversuche für geotechnische Erkundung und Untersuchung nach EN 1997 1 und EN 1997 2.

Reconnaissance et essais géotechniques - Essais de laboratoire sur les sols - Partie 8: Essai triaxial non consolidé non drainé (ISO 17892-8:2018)

La présente Norme internationale spécifie une méthode pour les essais à l'appareil triaxial de révolution en compression sur sols non drainés non consolidés.
Cette Norme internationale s'applique à la détermination en laboratoire de la résistance triaxiale au cisaillement de sols non drainés en conditions de chargement par compression dans le cadre d'investigations géotechniques.
L'éprouvette cylindrique, pouvant être constituée de sol non remanié, recompacté, remanié ou reconstitué, est soumise à une contrainte isotrope sans drainage et est ensuite cisaillée sans drainage. L'essai permet de déterminer la résistance au cisaillement et les relations contrainte-déformation en termes de contraintes totales.
Les procédures non standard, notamment les essais avec une mesure de la pression interstitielle ou les essais avec filtres drainants, ne sont pas couvertes par le présent document.
NOTE       Ce document satisfait aux exigences relatives aux essais en compression à l'appareil triaxial sur sols non consolidés et non drainés à des fins d'investigation et d'essais géotechniques conformément aux normes EN 1997‑1 et EN 1997‑2.

Geotehnično preiskovanje in preskušanje - Laboratorijsko preskušanje zemljin - 8. del: Nekonsolidirani nedrenirani triosni preskus (ISO 17892-8:2018)

Ta dokument določa metodo za nekonsolidirane, nedrenirane preskuse s triosnim stiskanjem.
Ta dokument se uporablja za laboratorijsko določevanje nedrenirane triosne strižne trdnosti pod tlačno obremenitvijo, ki spada na področje uporabe geotehničnega preiskovanja.
Valjast primerek, ki je lahko sestavljen iz neporušene, ponovno zgoščene, pregnetene ali obdelane
zemljine, je izpostavljen izotropni napetosti pod nedreniranimi pogoji in se nato striže pod nedreniranimi pogoji. Preskus omogoča določevanje strižne trdnosti in razmerij napetost–deformacija v smislu skupnih napetosti.
Nestandardni postopki, kot so preskusi z merjenjem pornega tlaka ali preskusi z odtoki filtra, v tem dokumentu niso zajeti.
OPOMBA: Ta dokument izpolnjuje zahteve za nekonsolidirane, nedrenirane preskuse s triosnim stiskanjem za geotehnično preiskovanje in preskušanje v skladu s standardoma EN 1997-1 in EN 1997-2.

General Information

Status
Published
Public Enquiry End Date
14-Dec-2016
Publication Date
16-May-2018
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
03-Apr-2018
Due Date
08-Jun-2018
Completion Date
17-May-2018

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SLOVENSKI STANDARD
SIST EN ISO 17892-8:2018
01-junij-2018
1DGRPHãþD
SIST-TS CEN ISO/TS 17892-8:2004
SIST-TS CEN ISO/TS 17892-8:2004/AC:2010

*HRWHKQLþQRSUHLVNRYDQMHLQSUHVNXãDQMH/DERUDWRULMVNRSUHVNXãDQMH]HPOMLQ

GHO1HNRQVROLGLUDQLQHGUHQLUDQLWULRVQLSUHVNXV ,62
Geotechnical investigation and testing - Laboratory testing of soil - Part 8:
Unconsolidated undrained triaxial test (ISO 17892-8:2018)

Geotechnische Erkundung und Untersuchung - Laborversuche an Bodenproben - Teil 8:

Unkonsolidierter undränierter Triaxialversuch (ISO 17892-8:2018)

Reconnaissance et essais géotechniques - Essais de laboratoire sur les sols - Partie 8:

Essai triaxial non consolidé non drainé (ISO 17892-8:2018)
Ta slovenski standard je istoveten z: EN ISO 17892-8:2018
ICS:
13.080.20 Fizikalne lastnosti tal Physical properties of soils
93.020 Zemeljska dela. Izkopavanja. Earthworks. Excavations.
Gradnja temeljev. Dela pod Foundation construction.
zemljo Underground works
SIST EN ISO 17892-8:2018 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 17892-8:2018
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SIST EN ISO 17892-8:2018
EN ISO 17892-8
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2018
EUROPÄISCHE NORM
ICS 13.080.20; 93.020 Supersedes CEN ISO/TS 17892-8:2004
English Version
Geotechnical investigation and testing - Laboratory testing
of soil - Part 8: Unconsolidated undrained triaxial test (ISO
17892-8:2018)

Reconnaissance et essais géotechniques - Essais de Geotechnische Erkundung und Untersuchung -

laboratoire sur les sols - Partie 8: Essai triaxial non Laborversuche an Bodenproben - Teil 8:

consolidé non drainé (ISO 17892-8:2018) Unkonsolidierter undränierter Triaxialversuch (ISO

17892-8:2018)
This European Standard was approved by CEN on 18 January 2018.

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 17892-8:2018 E

worldwide for CEN national Members.
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SIST EN ISO 17892-8:2018
EN ISO 17892-8:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 17892-8:2018
EN ISO 17892-8:2018 (E)
European foreword

This document (EN ISO 17892-8:2018) 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 September 2018, and conflicting national standards

shall be withdrawn at the latest by September 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 CEN ISO/TS 17892-8:2004.

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 17892-8:2018 has been approved by CEN as EN ISO 17892-8:2018 without any

modification.
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SIST EN ISO 17892-8:2018
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SIST EN ISO 17892-8:2018
INTERNATIONAL ISO
STANDARD 17892-8
First edition
2018-02
Geotechnical investigation and
testing — Laboratory testing of soil —
Part 8:
Unconsolidated undrained triaxial test
Reconnaissance et essais géotechniques — Essais de laboratoire sur
les sols —
Partie 8: Essai triaxial non consolidé non drainé
Reference number
ISO 17892-8:2018(E)
ISO 2018
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SIST EN ISO 17892-8:2018
ISO 17892-8:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

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, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
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SIST EN ISO 17892-8:2018
ISO 17892-8:2018(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Symbols .......................................................................................................................................................................................................................... 2

5 Apparatus ..................................................................................................................................................................................................................... 3

6 Test procedure ........................................................................................................................................................................................................ 6

6.1 General requirements and equipment preparation ................................................................................................ 6

6.2 Preparation of specimens .............................................................................................................................................................. 6

6.3 Application of cell pressure and initial readings ....................................................................................................... 7

6.4 Shearing ........................................................................................................................................................................................................ 8

6.5 Dismounting .............................................................................................................................................................................................. 8

7 Test results .................................................................................................................................................................................................................. 9

7.1 Bulk density, dry density and water content ................................................................................................................ 9

7.2 Stage prior to shearing ..................................................................................................................................................................... 9

7.3 Shearing ........................................................................................................................................................................................................ 9

7.3.1 Corrected cross-sectional area ............................................................................................................................ 9

7.3.2 Deviator stress ................................................................................................................................................................... 9

7.3.3 Vertical strain ...................................................................................................................................................................10

7.3.4 Undrained shear strength .....................................................................................................................................10

7.4 Correction for elastic membrane .........................................................................................................................................10

8 Test report ................................................................................................................................................................................................................10

8.1 Mandatory reporting ......................................................................................................................................................................10

8.2 Optional reporting ............................................................................................................................................................................11

Annex A (normative) Calibration, maintenance and checks ....................................................................................................12

Bibliography .............................................................................................................................................................................................................................14

© ISO 2018 – All rights reserved iii
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SIST EN ISO 17892-8:2018
ISO 17892-8:2018(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 the European Committee for Standardization (CEN) Technical

Committee CEN/TC 341, Geotechnical investigation and testing, in collaboration with ISO Technical

Committee TC 182, Geotechnics, in accordance with the Agreement on technical cooperation between

ISO and CEN (Vienna Agreement).

This first edition of ISO 17892-8 cancels and replaces ISO/TS 17892-8:2004 and ISO/TS 17892-

8:2004/Cor.1:2006.
A list of all the parts in the ISO 17892 series can be found on the ISO website.
iv © ISO 2018 – All rights reserved
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SIST EN ISO 17892-8:2018
ISO 17892-8:2018(E)
Introduction

This document covers areas in the international field of geotechnical engineering never previously

standardized. It is intended that this document presents broad good practice throughout the world and

significant differences with national documents is not anticipated. It is based on international practice

(see Reference [1]).
© ISO 2018 – All rights reserved v
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SIST EN ISO 17892-8:2018
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SIST EN ISO 17892-8:2018
INTERNATIONAL STANDARD ISO 17892-8:2018(E)
Geotechnical investigation and testing — Laboratory
testing of soil —
Part 8:
Unconsolidated undrained triaxial test
1 Scope

This document specifies a method for unconsolidated undrained triaxial compression tests.

This document is applicable to the laboratory determination of undrained triaxial shear strength under

compression loading within the scope of geotechnical investigations.

The cylindrical specimen, which can comprise undisturbed, re-compacted, remoulded or reconstituted

soil, is subjected to an isotropic stress under undrained conditions and thereafter is sheared

under undrained conditions. The test allows the determination of shear strength and stress-strain

relationships in terms of total stresses.

Non-standard procedures such as tests with the measurement of pore pressure or tests with filter

drains are not covered in this document.

NOTE This document fulfils the requirements of unconsolidated undrained triaxial compression tests for

geotechnical investigation and testing in accordance with EN 1997-1 and EN 1997-2.

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, Geotechnical investigation and testing — Identification and classification of soil — Part 1:

Identification and description

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
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
© ISO 2018 – All rights reserved 1
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SIST EN ISO 17892-8:2018
ISO 17892-8:2018(E)
3.1
cell pressure
pressure applied to the cell fluid
3.2
deviator stress

difference between the applied vertical total stress and the horizontal total stress at the mid height of

the specimen
3.3
undrained shear strength

equal to one half of the deviator stress at failure in the unconsolidated undrained triaxial

compression test
3.4
failure
stress or strain condition at which one of the following criteria are met:
— peak deviator stress;

— a specified deformation criterion if a peak deviator stress has not been achieved, e.g., 15 %

vertical strain.
4 Symbols
A initial cross-sectional area of the specimen
A cross-sectional area of the specimen during shear
cor
a cross-sectional area of the piston if an external load cell is used
c undrained shear strength
D initial internal diameter of membrane (before it is placed on the specimen)
E elastic modulus for the membrane, measured in tension
f factor relating the vertical strain to the specimen volumetric strain
H initial height of the specimen prior to shearing (=H -ΔH )
s i i
H Initial height of specimen after preparation
h distance from the top of the top cap to the mid height of the specimen
P vertical load reading
t initial thickness of the unstressed membrane
V initial volume of the specimen after preparation

W gravity force acting on the sum of the deadweight hanger (if used), the piston, the top cap and

one half of the soil specimen
γ unit weight of the cell fluid
ΔH height change prior to shearing
ΔH height change during shearing
2 © ISO 2018 – All rights reserved
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SIST EN ISO 17892-8:2018
ISO 17892-8:2018(E)
(Δσ ) correction to vertical total stress due to the membrane
v m
ε vertical strain
(ε ) vertical strain of the membrane
v m
σ cell pressure at the mid height of the specimen
σ horizontal total stress at the mid height of the specimen
σ vertical total stress at the mid height of the specimen

ΔV specimen volume change (with reduction in volume being a positive numerical value)

5 Apparatus
5.1 General

The apparatus shall undergo regular maintenance, checks and calibration as specified in Annex A.

A schematic diagram of a typical apparatus for triaxial compression testing is shown in Figure 1.

© ISO 2018 – All rights reserved 3
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SIST EN ISO 17892-8:2018
ISO 17892-8:2018(E)
Key
1 alternative positions for load measuring device
2 air bleed
3 vertical displacement measuring device
4 piston
5 top cap
6 soil specimen
7 rubber membrane
8 O-rings
9 device for control and measurement of cell pressure
10 triaxial cell
P vertical load

Figure 1 — Schematic diagram of a typical unconsolidated undrained triaxial apparatus

5.2 Triaxial cell

5.2.1 The triaxial cell shall be able to withstand the applied cell pressure without leakage of cell fluid

out of the cell. Transparent cells should be used where possible.

5.2.2 The sealing bushing and piston guide shall be designed such that the piston runs smoothly with

minimal friction and maintains alignment.

5.2.3 The material of the top cap and the pedestal and the connection between the top cap and the

piston shall be such that their deformations are negligible compared to the deformations of the soil

specimen.

5.2.4 The diameter of the top cap and of the pedestal should normally be equal to the diameter of the

specimen. Specimens with diameters smaller than the diameter of the end caps may be tested provided

cavities under the membrane at the ends of the specimen can be avoided.
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SIST EN ISO 17892-8:2018
ISO 17892-8:2018(E)

5.2.5 The vertical stress applied to the specimen due to the weight of the top cap should not exceed

2 % of the estimated undrained shear strength of the specimen or 1 kPa, whichever is the greater.

5.3 Confining membrane

5.3.1 The soil specimen shall be confined by an elastic membrane which effectively prevents the cell

fluid from penetr
...

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