ISO 22476-3:2005/Amd 1:2011

Geotechnical investigation and testing — Field testing — Part 3: Standard penetration test — Amendment 1

Reconnaissance et essais géotechniques — Essais en place — Partie 3: Essai de pénétration au carottier — Amendement 1

General Information

• Status: Published
• Publication Date: 09-Nov-2011
• ICS: 93.020 - Earthworks. Excavations. Foundation construction. Underground works
• Technical Committee: ISO/TC 182 - Geotechnics
• Drafting Committee: ISO/TC 182 - Geotechnics
• Current Stage: 6060 - International Standard published
• Start Date: 10-Nov-2011
• Due Date: 06-Sep-2013
• Completion Date: 06-Sep-2013

Relations

• Consolidates: EN ISO 22476-3:2005/A1:2011 - Geotechnical investigation and testing - Field testing - Part 3: Standard penetration test - Amendment 1 (ISO 22476-3:2005/Amd 1:2011)
• Effective Date: 12-Feb-2026
• Amends: ISO 22476-3:2005 - Geotechnical investigation and testing — Field testing — Part 3: Standard penetration test
• Effective Date: 13-Oct-2020

Overview

ISO 22476-3:2005/Amd 1:2011 is an international standard that provides amendments to Part 3 of ISO 22476-3, which focuses on geotechnical investigation and field testing - specifically the Standard Penetration Test (SPT) using a split-barrel sampler. This amendment clarifies requirements related to the equipment, execution, and reporting of SPT procedures conducted as part of geotechnical site investigations. It aligns SPT practices with European standards EN 1997-1 and EN 1997-2, ensuring consistency and reliability in geotechnical field testing.

Issued by ISO (International Organization for Standardization), this amendment enhances the methodology and technical details for conducting SPT for soil characterization, improving data quality and facilitating safer foundation design and ground assessments.

Key Topics

• Scope and Application
  The amendment specifies updated requirements for the apparatus used in SPTs, proper execution procedures, and detailed reporting protocols. It applies primarily to tests done within geotechnical site investigations that complement direct reconnaissance methods.

• Equipment Specifications

  • Stiffness requirements for rods: AW rods for depths under 20 meters, BW rods for greater depths, following ISO 22475-1:2006.
  • Straightness checks for rods using rotation tests, rolling on flat surfaces, or sliding through hollow tubes to ensure proper alignment.
  • Use of stabilizing equipment for deeper and/or larger diameter boreholes to maintain vertical alignment.

• Testing Procedures

  • Execution includes penetration in phases (two phases at 150 mm or four phases at 75 mm increments).
  • Definition and measurement of initial driving resistance (penetration of 150 mm or up to 25 hammer blows).
  • Annual calibration of the hammer driving device and recalibration after modifications or repairs.

• Reporting and Documentation

  • SPT results recorded as raw blow counts without adjustments, with separate reporting of initial penetration and subsequent test penetration counts.
  • Detailed logging of rod types, stabilizing equipment, number and depth of penetration phases, and any special conditions encountered during testing.

Applications

ISO 22476-3:2005/Amd 1:2011 is critical for:

• Geotechnical Site Characterization
  Standardizing field penetration tests enhances reliability in subsurface soil profiling required for engineering design.

• Foundation Design and Soil Stability Analysis
  Accurate SPT data allow engineers to better assess bearing capacities, settlement characteristics, and liquefaction potential.

• Construction and Civil Engineering Projects
  Used widely in infrastructure development - from buildings and bridges to roads and tunnels - to ensure ground suitability and mitigate risks.

• Compliance with International and European Standards
  Aligns SPT methods with EN 1997 standards, facilitating cross-border engineering projects and regulatory approvals.

Related Standards

• ISO 22475-1:2006 - Geotechnical investigation and testing - Methods of sampling and in situ testing - Part 1: Technical principles for field work
  Provides complementary guidance on sampling rods and piezometer installations referenced in ISO 22476-3 amendments.

• EN 1997-1 and EN 1997-2 - Eurocode 7: Geotechnical design standards
  European foundational standards for geotechnical design, referencing testing methods like the SPT for soil investigation.

• ISO 22476 (general series) - Series covering geotechnical field testing methods, providing comprehensive methodologies for various in situ tests.

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Keywords: ISO 22476-3 amendment, standard penetration test, geotechnical field testing, soil investigation, SPT equipment, geotechnical standards, foundation design, soil stability, EN 1997 compliance, rod stiffness, test calibration, geotechnical site characterization.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 22476-3
First edition
2005-01-15
AMENDMENT 1
2011-11-15
Geotechnical investigation and testing —
Field testing —
Part 3:
Standard penetration test
AMENDMENT 1
Reconnaissance et essais géotechniques — Essais en place —
Partie 3: Essai de pénétration au carottier
AMENDEMENT 1
Reference number
ISO 22476-3:2005/Amd.1:2011(E)
©
ISO 2011
ISO 22476-3:2005/Amd.1:2011(E)

©  ISO 2011
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56  CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
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Published in Switzerland
ii © ISO 2011 – All rights reserved

ISO 22476-3:2005/Amd.1:2011(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
Amendment 1 to ISO 22476-3:2005 was prepared by the European Committee for Standardization (CEN)
Technical Committee CEN/TC 341, Geotechnical Investigation and Testing, in collaboration with Technical
Committee ISO/TC 182, Geotechnics, Subcommittee SC 1, Geotechnical investigation and testing, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

ISO 22476-3:2005/Amd.1:2011(E)

Geotechnical investigation and testing — Field testing —
Part 3:
Standard penetration test
AMENDMENT 1
Page 1, Scope
Replace the first paragraph with the following:
This part of ISO 22476 deals with the equipment requirements for, execution of and reporting on the
standard penetration test to complement direct investigations (e.g. ISO 22475-1).
NOTE This part of ISO 22476 fulfils the requirements for standard penetration testing as part of geotechnical
investigation and testing in accordance with EN 1997-1 and EN 1997-2.

Page 1, Normative references
Replace prEN ISO 22475-1 with the following:
ISO 22475-1:2006, Geotechnical investigation and testing — Sampling methods and groundwater
measurements — Part 1: Technical principles for execution

Page 3, 4.3
After the first sentence of the first paragraph, add the following sentence:
The rod stiffness should be at least that of an AW rod for tests less than 20 m depth, and of a BW rod
for greater depth. For definitions of AW and BW rods, see ISO 22475-1:2006, Table C.1.
At the end of the first paragraph, add the following:
The straightness shall be checked by applying one of the following procedures.
 Holding the ro
...

NORME  ISO
INTERNATIONALE 22476-3
Première édition
2005-01-15
AMENDEMENT 1
2011-11-15
Reconnaissance et essais
géotechniques — Essais en place —
Partie 3:
Essai de pénétration au carottier
AMENDEMENT 1
Geotechnical investigation and testing — Field testing —
Part 3: Standard penetration test
AMENDMENT 1
Numéro de référence
ISO 22476-3:2005/Amd.1:2011(F)
©
ISO 2011
ISO 22476-3:2005/Amd.1:2011(F)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
©  ISO 2011
Droits de reproduction réservés. Sauf prescription différente, aucune partie de cette publication ne peut être reproduite ni utilisée sous
quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les microfilms, sans l’accord écrit
de l’ISO à l’adresse ci-après ou du comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Publié en Suisse
ii © ISO 2011 – Tous droits réservés

ISO 22476-3:2005/Amd.1:2011(F)
Avant-propos
L’ISO (Organisation internationale de normalisation) est une fédération mondiale d’organismes nationaux de
normalisation (comités membres de l’ISO). L’élaboration des Normes internationales est en général confiée aux
comités techniques de l’ISO. Chaque comité membre intéressé par une étude a le droit de faire partie du comité
technique créé à cet effet. Les organisations internationales, gouvernementales et non gouvernementales,
en liaison avec l’ISO participent également aux travaux. L’ISO collabore étroitement avec la Commission
électrotechnique internationale (CEI) en ce qui concerne la normalisation électrotechnique.
Les Normes internationales sont rédigées conformément aux règles données dans les Directives ISO/CEI,
Partie 2.
La tâche principale des comités techniques est d’élaborer les Normes internationales. Les projets de Normes
internationales adoptés par les comités techniques sont soumis aux comités membres pour vote. Leur
publication comme Normes internationales requiert l’approbation de 75 % au moins des comités membres
votants.
L’attention est appelée sur le fait que certains des éléments du présent document peuvent faire l’objet de droits
de propriété intellectuelle ou de droits analogues. L’ISO ne saurait être tenue pour responsable de ne pas avoir
identifié de tels droits de propriété et averti de leur existence.
L’Amendement 1 à l’ISO 22476-3:2005 a été élaboré par le comité technique CEN/TC 341, Enquête géotechnique
et test, en collaboration avec le comité technique ISO/TC 182, Géotechnique, sous-comité SC 1, Recherches
et essais géotechniques, conformément à l’Accord de coopération technique entre l’ISO et le CEN (Accord de
Vienne).
© ISO 2011 – Tous droits réservés  iii

ISO 22476-3:2005/Amd.1:2011(F)
Reconnaissance et essais géotechniques — Essais en place —
Partie 3:
Essai de pénétration au carottier
AMENDEMENT 1
Page 1, Domaine d’application
Remplacer le premier alinéa par le texte suivant:
«La présente partie de l’ISO 22476 traite des exigences en matière d’appareillage, de l’exécution
et de l’établissement des rapports d’essais de pénétration au carottier menés en complément des
reconnaissances directes (par exemple ISO 22475-1).
NOTE  La présente partie de l’ISO 22476 répond aux exigences applicables aux essais de pénétration au
carottier effectués dans le cadre des reconnaissances géotechniques selon l’EN 1997-1 et l’EN 1997-2.»
Page 1, Références normatives
Remplacer la référence à la prEN ISO 22475-1 par la référence suivante:
ISO 22475-1:2006, Reconnaissance et essais géotechniques — Méthodes de prélèvement et mesurages
piézométriques — Partie 1: Principes techniques des travaux
Page 3, 4.3
Après la première phrase de l’alinéa actuel, ajouter le texte suivant:
«Il convient d’utiliser des tiges d’une rigidité au moins égale à celle d’une tige AW pour les essais à moins
de 20 m de profondeur, et à celle d’une tige BW pour les essais à plus grande profondeur. Pour la définition
des tiges AW et BW, voir l’ISO 22475-1:2006, Tableau C.1.»
À la fin de l’alinéa actuel, ajouter le texte suivant:
«La rectitude doit être contrôlée en appliquant l’un des modes opératoires suivants:
—  en soutenant la tige verticalement et en lui appliquant une rotation; si la tige semble osciller, la rectitude
n’est pas acceptable;
—  en faisant rouler la tige sur une surface p
...