EN ISO 18674-4:2020

Geotechnical investigation and testing - Geotechnical monitoring by field instrumentation - Part 4: Measurement of pore water pressure: Piezometers (ISO 18674-4:2020)

This document specifies the measurement of pore water pressures and piezometric levels in saturated ground by means of piezometers installed for geotechnical monitoring. General rules of performance monitoring of the ground, of structures interacting with the ground, of geotechnical fills and of geotechnical works are presented in ISO 18674‑1.
If applied in conjunction with ISO 18674-5, the procedures described in this document allow the determination of effective stresses acting in the ground.
This document is applicable to:
—     monitoring of water pressures acting on and in geotechnical structures (e.g. quay walls, dikes, excavation walls, foundations, dams, tunnels, slopes, embankments, etc.);
—     monitoring of consolidation processes of soil and fill (e.g. beneath foundations and in embankments);
—     evaluating stability and serviceability of geotechnical structures;
—     checking geotechnical designs in connection with the Observational Design procedure.
NOTE    This document fulfils the requirements for the performance monitoring of the ground, of structures interacting with the ground and of geotechnical works by the means of piezometers, installed as part of the geotechnical investigation and testing in accordance with References [4] and [5] This document relates to measuring devices, which are installed in the ground. For pore water pressure measurements carried out in connection with cone penetration tests, see ISO 22476-1.

Geotechnische Erkundung und Untersuchung - Geotechnische Messungen - Teil 4: Porenwasserdruckmessungen: Piezometer (ISO 18674-4:2020)

Dieses Dokument legt die Messung von Porenwasserdrücken und piezometrischen Höhen in gesättigten Böden mit Hilfe von Piezometern fest, die zur geotechnischen Überwachung installiert werden. Die allgemeinen Regeln für die messtechnische Überwachung des Baugrunds, der mit dem Baugrund in Wechselwirkung stehenden Bauwerke, geotechnischer Auffüllungen und geotechnischer Bauarbeiten sind in ISO 18674 1 angegeben.
In Verbindung mit ISO 18674 5 erlauben die in diesem Dokument beschriebenen Verfahren die Bestimmung der im Baugrund wirkenden effektiven Spannungen.
Dieses Dokument ist anzuwenden für:
- die Überwachung von auf und in geotechnischen Bauwerken (z. B. Kaimauern, Deiche, Baugrubenwände, Gründungen, Dämme, Tunnel, Böschungen, Aufschüttungen usw.) wirkenden Wasserdrücken;
- die Überwachung von Konsolidierungsprozessen von Böden und Schüttmaterial (z. B. unterhalb von Gründungen und in Aufschüttungen);
- die Bewertung der Stabilität und Gebrauchstauglichkeit von geotechnischen Bauwerken;
- die Überprüfung geotechnischer Entwürfe im Zusammenhang mit der Beobachtungsmethode.
ANMERKUNG Dieses Dokument erfüllt die Anforderungen für die messtechnische Überwachung des Baugrunds, der mit dem Baugrund in Wechselwirkung stehenden Bauwerke und geotechnischer Bauarbeiten, die mittels Piezometern durchgeführt wird, die im Rahmen der geotechnischen Erkundung und Untersuchung nach Verweisung [4] und [5] eingebaut werden. Dieses Dokument bezieht sich auf Messgeräte, die im Baugrund eingebaut werden. Für Informationen zu im Zusammenhang mit Drucksondierungen durchgeführten Porenwasserdruckmessungen siehe ISO 22476 1.

Reconnaissance et essais géotechniques - Surveillance géotechnique par instrumentation in situ - Partie 4: Mesure de la pression interstitiell (ISO 18674-4:2020)

Le présent document spécifie la mesure des pressions interstitielles et des niveaux piézométriques dans un sol saturé, au moyen de piézomètres installés dans le cadre d'une surveillance géotechnique. Les règles générales de surveillance des performances du terrain, des structures en interaction avec le terrain, des remblais et des travaux géotechniques sont présentées dans l'ISO 18674‑1.
Si elles sont appliquées conjointement à la norme ISO 18674‑5, les procédures décrites dans le présent document permettent de déterminer les contraintes effectives qui agissent dans le sol.
Le présent document s'applique:
—          au suivi des pressions d'eau qui agissent sur et dans les structures géotechniques (par ex. parois de quais, digues, parois d'excavation, fondations, barrages, tunnels, talus, levées de terre, etc.);
—          au suivi des processus de consolidation du terrain et des remblais (par ex. sous des fondations et dans des levées de terre);
—          à l'évaluation de la stabilité et de l'aptitude à l'entretien des structures géotechniques;
—          au contrôle des calculs géotechniques en lien avec la procédure observationnelle.
NOTE       Le présent document satisfait aux exigences relatives à la surveillance des performances du terrain, des structures en interaction avec le terrain et des ouvrages géotechniques au moyen de piézomètres mis en œuvre dans le cadre des études et essais géotechniques conformément aux Références [4] et [5]. Le présent document se rapporte à des dispositifs de mesure, lesquels sont installés dans le sol. Pour les mesures de pression interstitielle réalisées en lien avec des essais de pénétration au cône, voir l'ISO 22476‑1.

Geotehnično preiskovanje in preskušanje - Geotehnične meritve - 4. del: Meritve tlaka porne vode: piezometri (ISO 18674-4:2020)

General Information

• Status: Published
• Publication Date: 14-Jul-2020
• Withdrawal Date: 30-Jan-2021
• ICS: 13.080.20 - Physical properties of soils
• ICS: 93.020 - Earthworks. Excavations. Foundation construction. Underground works
• Technical Committee: CEN/TC 341 - Geotechnical Investigation and Testing
• Drafting Committee: CEN/TC 341 - Geotechnical Investigation and Testing
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 15-Jul-2020
• Completion Date: 15-Jul-2020
• Ref Project: SIST EN ISO 18674-4:2020 - Geotechnical investigation and testing - Geotechnical monitoring by field instrumentation - Part 4: Measurement of pore water pressure: Piezometers (ISO 18674-4:2020)

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2020
Geotehnično preiskovanje in preskušanje - Geotehnične meritve - 4. del: Meritve
tlaka porne vode: piezometri (ISO 18674-4:2020)
Geotechnical investigation and testing - Geotechnical monitoring by field instrumentation
- Part 4: Measurement of pore water pressure: Piezometers (ISO 18674-4:2020)
Geotechnische Erkundung und Untersuchung - Geotechnische Messungen - Teil 4:
Porenwasserdruckmessungen: Piezometer (ISO 18674-4:2020)
Reconnaissance et essais géotechniques - Surveillance géotechnique par
instrumentation in situ - Partie 4: Mesure de la pression interstitiell (ISO 18674-4:2020)
Ta slovenski standard je istoveten z: EN ISO 18674-4:2020
ICS:
13.080.05 Preiskava tal na splošno Examination of soils in
general
17.100 Merjenje sile, teže in tlaka Measurement of force,
weight and pressure
93.020 Zemeljska dela. Izkopavanja. Earthworks. Excavations.
Gradnja temeljev. Dela pod Foundation construction.
zemljo Underground works
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 18674-4
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2020
EUROPÄISCHE NORM
ICS 13.080.20; 93.020
English Version
Geotechnical investigation and testing - Geotechnical
monitoring by field instrumentation - Part 4: Measurement
of pore water pressure: Piezometers (ISO 18674-4:2020)
Reconnaissance et essais géotechniques - Surveillance Geotechnische Erkundung und Untersuchung -
géotechnique par instrumentation in situ - Partie 4: Geotechnische Messungen - Teil 4:
Mesure de la pression interstitiell (ISO 18674-4:2020) Porenwasserdruckmessungen: Piezometer (ISO
18674-4:2020)
This European Standard was approved by CEN on 23 June 2020.

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, 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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 18674-4:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 18674-4:2020) 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 January 2021, and conflicting national standards shall
be withdrawn at the latest by January 2021.
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.
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, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 18674-4:2020 has been approved by CEN as EN ISO 18674-4:2020 without any
modification.
INTERNATIONAL ISO
STANDARD 18674-4
First edition
2020-06
Geotechnical investigation and
testing — Geotechnical monitoring by
field instrumentation —
Part 4:
Measurement of pore water pressure:
Piezometers
Reconnaissance et essais géotechniques — Surveillance géotechnique
par instrumentation in situ —
Partie 4: Mesure de la pression interstitielle: Piézomètres
Reference number
ISO 18674-4:2020(E)
©
ISO 2020
ISO 18674-4:2020(E)
© ISO 2020
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
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Phone: [phone]
Email: [e-mail]
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Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 18674-4:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 7
5 Instruments . 7
5.1 General . 7
5.2 Open piezometer systems . 9
5.2.1 General. 9
5.2.2 Types of open piezometer systems .10
5.3 Closed piezometer systems .13
5.3.1 General.13
5.3.2 Types of closed piezometer systems .16
5.4 Absolute versus relative measurements and atmospheric compensation.17
5.5 Requirements for filters .19
5.5.1 Filters in open piezometer systems.19
5.5.2 Filters in closed piezometer systems .19
5.6 Measuring range and accuracy .20
6 Installation and measuring procedure .20
6.1 Installation .20
6.1.1 General.20
6.1.2 Installation of open piezometer systems .21
6.1.3 Installation of closed piezometer systems .23
6.1.4 Checks before, during and after installation .24
6.1.5 Maintenance .25
6.2 Carrying out the measurement .25
6.2.1 Instrumentation check and calibration .25
6.2.2 Measurement .26
7 Data processing and evaluation .26
8 Reporting .26
8.1 Installation report .26
8.2 Monitoring report .26
Annex A (normative) Measuring and evaluation procedure .27
Annex B (informative) Geo-engineering applications .34
Annex C (informative) Protection of piezometers at the ground level .36
Annex D (informative) Response time for pore water pressure measurements .39
Annex E (normative) Fully grouted piezometer installation.42
Annex F (normative) Measuring negative pore water pressure (soil suction) .44
Annex G (informative) Measuring examples .45
Bibliography .57
ISO 18674-4:2020(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
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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/
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