ISO 22476-5:2023

INTERNATIONAL ISO
STANDARD 22476-5
Second edition
2023-03
Geotechnical investigation and
testing — Field testing —
Part 5:
Prebored pressuremeter test
Reconnaissance et essais géotechniques — Essais en place —
Partie 5: Essai au pressiomètre en préforage
Reference number
© ISO 2023
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ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols . 1
3.1 Terms and definitions . 1
3.2 Symbols and abbreviations . 5
4 Equipment . 6
4.1 General . 6
4.2 Pressuremeter probe . 10
4.3 Connecting lines . 10
4.4 Control unit (CU) . 10
4.5 Measurement and control accuracy . 11
4.5.1 Time . 11
4.5.2 Pressure and expansion . . 11
4.5.3 Display of readings . 11
4.5.4 Expansion calibration cylinder . 11
5 Test procedures .11
5.1 Assembly of parts. 11
5.2 Calibration of the testing device and corrections of readings .12
5.3 Pressuremeter test pocket and probe placing .12
5.4 Test execution . .12
5.4.1 Test loading programmes .12
5.4.2 Reference loading programmes . 13
5.4.3 Readings and recordings before and during the test .13
5.5 End of test . 14
5.6 Backfilling of borehole . 14
5.7 Safety requirements . 14
6 Test results . .14
6.1 General . 14
6.2 Corrected pressure, radial displacement and volume . 15
6.3 Apparent pressuremeter moduli . 15
6.4 Results . . 16
6.4.1 Determination of moduli . 16
6.4.2 Reference loading programme A . 16
6.4.3 Reference loading programme B. 17
6.4.4 Reference loading programme C . 18
7 Reporting .19
7.1 General . 19
7.2 Contents . 19
7.3 Presentation of test results . 21
Annex A (normative) Calibration and corrections .22
Annex B (informative) Performing the test .30
Annex C (normative) Accuracy and uncertainties .36
Bibliography .37
iii
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 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 182, Geotechnics, in collaboration with
the European Committee for Standardization (CEN) Technical Committee CEN/TC 341, Geotechnical
Investigation and Testing, in accordance with the Agreement on technical cooperation between ISO and
CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 22476-5:2012), which has been technically
revised.
The main changes are as follows:
— the title of the part has been modified;
— a reference loading programme with cyclic loading has been added;
— calibration procedures have been developed.
A list of all parts in the ISO 22476 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 22476-5:2023(E)
Geotechnical investigation and testing — Field testing —
Part 5:
Prebored pressuremeter test
1 Scope
This document is applicable to pressuremeter tests using cylindrical flexible probes placed in pre-
existent boreholes using testing procedures other than the Menard procedure.
Pressuremeter tests following the Menard procedure are provided in ISO 22476-4.
NOTE A high-pressure flexible pressuremeter probe which contains transducers for the measurement of
radial displacements is also known as flexible dilatometer probe or high-pressure dilatometer probe.
This document applies to tests performed in any kind of grounds, starting from soils, treated or
untreated fills, hard soils and soft rocks, up to hard and very hard rocks, either on land or offshore.
The parameters derived from this test can include stiffness, strength, initial in-situ stress state and
consolidation properties.
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.
EN 16228-1, Drilling and foundation equipment – safety – Part 1:Common requirements
EN 16228-2, Drilling and foundation equipment – safety – Part 2: Mobile drill rigs for civil and geotechnical
engineering, quarrying and mining
ISO 10012, Measurement management systems — Requirements for measurement processes and measuring
equipment
ISO 14689, Geotechnical investigation and testing — Identification, description and classification of rock
ISO 22475-1, Geotechnical investigation and testing — Sampling methods and groundwater measurements
— Part 1: Technical principles for the sampling of soil, rock and groundwater
ISO 22476-4, Geotechnical investigation and testing — Field testing — Part 4: Prebored pressuremeter test
by Ménard procedure
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
...