ISO 22476-1:2022

Geotechnical investigation and testing — Field testing — Part 1: Electrical cone and piezocone penetration test

This document establishes equipment, procedural and reporting requirements and recommendations on cone and piezocone penetration tests. NOTE This document fulfils the requirements for cone and piezocone penetration tests as part of geotechnical investigation and testing according to the EN 1997 series. This document specifies the following features: a) type of cone penetration test; b) cone penetrometer class according to Table 2; c) test categories according to Table 3; d) penetration length or penetration depth; e) elevation of the ground surface or the underwater ground surface at the location of the cone penetration test with reference to a datum; f) location of the cone penetration test relative to a reproducible fixed location reference point; g) pore pressure dissipation tests. This document covers onshore and nearshore cone penetration test (CPT). For requirements for offshore CPT, see ISO 19901-8.

Reconnaissance et essais géotechniques — Essais en place — Partie 1: Essais de pénétration au cône électrique et au piézocône

Le présent document établit les exigences et les recommandations en matière d’appareillage, de modes opératoires et de compte rendu pour les essais de pénétration au cône et au piézocône NOTE Le présent document traite des exigences relatives au cône et au piézocône dans le cadre de la reconnaissance et des essais géotechniques selon la série de normes EN 1997. Ce document spécifie les caractéristiques suivantes: a) type d’essai de pénétration au cône; b) classe de pointe pénétrométrique selon le Tableau 2; c) catégories d’essai selon le Tableau 3; d) longueur ou profondeur de pénétration; e) la cote altimétrique de la surface du sol ou la cote de la surface de la nappe à l’emplacement de l’essai de pénétration au cône par rapport à un repère précisé; f) l’emplacement de l’essai de pénétration au cône par rapport à un point de référence fixe reproductible; g) les essais de dissipation de la pression interstitielle. Ce document couvre les essais de pénétration au cône (CPT) en milieu terrestre et en milieu côtier. Pour les exigences relatives aux essais CPT en mer, voir l’ISO 19901-8.

General Information

• Status: Published
• Publication Date: 19-Dec-2022
• ICS: 93.020 - Earthworks. Excavations. Foundation construction. Underground works
• Technical Committee: ISO/TC 182 - Geotechnics
• Drafting Committee: ISO/TC 182/WG 7 - Cone and piezocone penetration tests
• Current Stage: 6060 - International Standard published
• Start Date: 20-Dec-2022
• Due Date: 02-May-2022
• Completion Date: 20-Dec-2022

Relations

• Consolidates: ISO 20150:2019 - Footwear and footwear components — Quantitative challenge test method to assess antifungal activity
• Effective Date: 06-Jun-2022
• Revises: ISO 22476-1:2012 - Geotechnical investigation and testing — Field testing — Part 1: Electrical cone and piezocone penetration test
• Effective Date: 07-Apr-2018
• Revises: ISO 22476-1:2012/Cor 1:2013 - Geotechnical investigation and testing — Field testing — Part 1: Electrical cone and piezocone penetration test — Technical Corrigendum 1
• Effective Date: 07-Apr-2018

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 22476-1
Second edition
2022-12
Geotechnical investigation and
testing — Field testing —
Part 1:
Electrical cone and piezocone
penetration test
Reconnaissance et essais géotechniques — Essais en place —
Partie 1: Essais de pénétration au cône électrique et au piézocône
Reference number
© ISO 2022
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ii
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols . 1
3.1 Terms and definitions . 2
3.2 Symbols . 8
4 Equipment .11
4.1 General . 11
4.1.1 Tolerances . 11
4.1.2 Gaps and soil seals . 11
4.2 Cone penetrometer . 11
4.3 Surface roughness and hardness . 11
4.4 Cone .12
4.5 Friction sleeve . 13
4.6 Filter element . 14
4.6.1 General filter location . 14
4.6.2 Pore pressure u . 14
4.6.3 Pore pressure u . 15
4.6.4 Pore pressure u . 15
4.7 Pushrods . 15
4.8 Measuring system . 15
4.8.1 Accuracy . 15
4.8.2 Sensors for cone resistance and sleeve friction. 16
4.8.3 Sensor for pore pressure . 16
4.8.4 Sensor for inclination . 16
4.8.5 Sensor for temperature . 16
4.8.6 Measuring of penetration length . 16
4.8.7 Raw data . 16
4.9 Thrust machine . 17
5 Test procedures .17
5.1 Selection of equipment, procedures and evaluation of results . 17
5.1.1 General . 17
5.1.2 Calibration and verification requirements . 17
5.1.3 Cone penetrometer class conformity assessment . 18
5.2 Position and verticality of thrust machine . 20
5.3 Preparation of the test . 20
5.4 Pushing of the cone penetrometer . 21
5.5 Use of friction-reducing techniques. 21
5.6 Frequency of test data recording . 21
5.7 Registration of penetration length . 21
5.8 Pore pressure dissipation test (PPDT). 22
5.9 Test completion .22
5.10 Evaluation of CPT/CPTU in relation to test category . 23
5.11 Equipment checks and calibrations . 24
5.12 Safety requirements . 24
6 Test results . .24
6.1 Measured parameters . 24
6.2 Correction of parameters.25
6.3 Calculated parameters . 27
7 Reporting .27
7.1 General . 27
iii
7.2 Reporting of test results . 27
7.2.1 General information . 27
7.2.2 Location of the test .28
7.2.3 Test equipment .28
7.2.4 Test results .29
7.3 Presentation of test results .29
Annex A (informative) Suitability of test methods .31
Annex B (normative) Maintenance, checks and calibration .34
Annex C (informative) Calibration report example .52
Annex D (normative) Calculation of penetration depth .62
Annex E (informative) Correction of sleeve friction for water pressure .63
Annex F (informative) Preparation of the piezocone .64
Annex G (informative) Friction reduction techniques .65
Bibliography .66
iv
Foreword
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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
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