Geotechnical investigation and testing - Field testing - Part 5: Flexible dilatometer test (ISO 22476-5:2012)

This part of ISO 22476 specifies the equipment requirements, execution of and reporting on flexible dilatometer tests. This part of ISO 22476 is applicable to tests in ground stiff enough not to be adversely affected by the drilling operation. This part of ISO 22476 is applicable to four procedures for conducting a test with the flexible dilatometer. This part of ISO 22476 applies to tests performed up to 1 800 m depth. Testing can be conducted either on land or off-shore.

Geotechnische Erkundung und Untersuchung - Felduntersuchungen - Teil 5: Versuch mit dem flexiblen Dilatometer (ISO 22476-5:2012)

Dieser Teil von ISO 22476 gilt für Felduntersuchungen unter Anwendung des Versuchs mit dem flexiblen Dilatometer als Teil der geotechnischen Erkundung und Untersuchung nach EN 1997 1 [1] und EN 1997 2 [2].
Dieser Teil von ISO 22476 gilt für Versuche in einem Baugrund, der ausreichend steif ist, um durch den Bohrvorgang nicht beeinträchtigt zu werden.
Dieser Teil von ISO 22476 gilt für vier Verfahren zur Durchführung eines Versuchs mit dem flexiblen Dilato-meter.
Dieser Teil von ISO 22476 gilt für Versuche in einer Tiefe bis einschließlich 1 800 m. Versuche können entweder auf Land oder auf See durchgeführt werden.

Reconnaissance et essais géotechniques - Essais en place - Partie 5: Essai au dilatomètre flexible (ISO 22476-5:2012)

L'ISO 22476-5:2012 traite des exigences relatives à l'appareillage, à l'exécution et au compte rendu des essais au dilatomètre flexible.
L'ISO 22476-5:2012 est applicable aux essais dans un terrain suffisamment ferme pour ne pas être affecté par l'opération de forage.
L'ISO 22476-5:2012 est applicable aux quatre modes opératoires permettant de réaliser un essai avec le dilatomètre flexible.
L'ISO 22476-5:2012 s'applique aux essais réalisés jusqu'à 1 800 m de profondeur. Les essais peuvent être menés en milieu terrestre ou aquatique.

Geotehnično preiskovanje in preskušanje - Preskušanje na terenu - 5. del: Preskus s podajnim dilatometrom v vrtini (ISO 22476-5:2012)

Ta del standarda ISO 22476 določa zahteve glede opreme, izvajanja preskusov s podajnim dilatometrom v vrtini ter poročanja v zvezi z njimi. Ta del standarda ISO 22476 se uporablja za preskuse v tleh, ki so dovolj trdna, da vrtanje nima negativnega vpliva. Ta del standarda ISO 22476 se uporablja za štiri postopke za izvajanje preskusa s podajnim dilatometrom v vrtini. Ta del standarda ISO 22476 se uporablja za preskuse, ki se izvajajo v globini do 1800 m. Preskušanje lahko poteka na kopnem ali na morju.

General Information

Status
Published
Public Enquiry End Date
29-Sep-2012
Publication Date
21-May-2013
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
13-Dec-2012
Due Date
17-Feb-2013
Completion Date
22-May-2013

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SLOVENSKI STANDARD
SIST EN ISO 22476-5:2013
01-junij-2013

*HRWHKQLþQRSUHLVNRYDQMHLQSUHVNXãDQMH3UHVNXãDQMHQDWHUHQXGHO3UHVNXV

VSRGDMQLPGLODWRPHWURPYYUWLQL ,62

Geotechnical investigation and testing - Field testing - Part 5: Flexible dilatometer test

(ISO 22476-5:2012)

Geotechnische Erkundung und Untersuchung - Felduntersuchungen - Teil 5: Versuch mit

dem flexiblen Dilatometer (ISO 22476-5:2012)
Reconnaissance et essais géotechniques - Essais en place - Partie 5: Essai au
dilatomètre flexible (ISO 22476-5:2012)
Ta slovenski standard je istoveten z: EN ISO 22476-5:2012
ICS:
93.020 Zemeljska dela. Izkopavanja. Earthworks. Excavations.
Gradnja temeljev. Dela pod Foundation construction.
zemljo Underground works
SIST EN ISO 22476-5:2013 en,fr,de

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

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SIST EN ISO 22476-5:2013
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SIST EN ISO 22476-5:2013
EUROPEAN STANDARD
EN ISO 22476-5
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2012
ICS 93.020
English Version
Geotechnical investigation and testing - Field testing - Part 5:
Flexible dilatometer test (ISO 22476-5:2012)

Reconnaissance et essais géotechniques - Essais en place Geotechnische Erkundung und Untersuchung -

- Partie 5: Essai au dilatomètre flexible (ISO 22476-5:2012) Felduntersuchungen - Teil 5: Versuch mit dem flexiblen

Dilatometer (ISO 22476-5:2012)
This European Standard was approved by CEN on 25 November 2012.

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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United

Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 22476-5:2012: E

worldwide for CEN national Members.
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SIST EN ISO 22476-5:2013
EN ISO 22476-5:2012 (E)
Contents Page

Foreword ..............................................................................................................................................................3

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SIST EN ISO 22476-5:2013
EN ISO 22476-5:2012 (E)
Foreword

This document (EN ISO 22476-5:2012) has been prepared by Technical Committee CEN/TC 341

“Geotechnical Investigation and Testing", the secretariat of which is held by ELOT, in collaboration with

Technical Committee ISO/TC 182 "Geotechnics".

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 June 2013, and conflicting national standards shall be withdrawn at

the latest by June 2013.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.

Selon le Règlement Intérieur du CEN/CENELEC, les instituts de normalisation nationaux des pays suivants

sont tenus de mettre cette Norme européenne en application : Allemagne, Ancienne République yougoslave

de Macédoine, Autriche, Belgique, Bulgarie, Chypre, Croatie, Danemark, Espagne, Estonie, Finlande, France,

Grèce, Hongrie, Irlande, Islande, Italie, Lettonie, Lituanie, Luxembourg, Malte, Norvège, Pays-Bas, Pologne,

Portugal, République tchèque, Roumanie, Royaume-Uni, Slovaquie, Slovénie, Suède, Suisse et Turquie.

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SIST EN ISO 22476-5:2013
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SIST EN ISO 22476-5:2013
INTERNATIONAL ISO
STANDARD 22476-5
First edition
2012-12-01
Geotechnical investigation and testing —
Field testing —
Part 5:
Flexible dilatometer test
Reconnaissance et essais géotechniques — Essais en place —
Partie 5: Essai au dilatomètre flexible
Reference number
ISO 22476-5:2012(E)
ISO 2012
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SIST EN ISO 22476-5:2013
ISO 22476-5:2012(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2012

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 copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2012 – All rights reserved
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SIST EN ISO 22476-5:2013
ISO 22476-5:2012(E)
Contents Page

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

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

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

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

3 Terms, definitions and symbols ...................................................................................................................... 1

3.1 Terms and definitions ......................................................................................................................................... 1

3.2 Symbols and abbreviations .............................................................................................................................. 3

4 Equipment ............................................................................................................................................................. 5

4.1 General ................................................................................................................................................................... 5

4.2 Dilatometer probe ................................................................................................................................................ 6

4.3 Pressure control and displacement measuring units ............................................................................... 8

4.4 Connecting lines .................................................................................................................................................. 8

4.5 Measurement and control accuracy ............................................................................................................... 8

4.6 Data logging .......................................................................................................................................................... 9

5 Test procedure ..................................................................................................................................................... 9

5.1 Safety requirements ........................................................................................................................................... 9

5.2 Assembly of parts ............................................................................................................................................... 9

5.3 Calibration of the testing device and corrections of readings ............................................................... 9

5.4 Uncertainties of measurement .......................................................................................................................10

5.5 Preparation for the sounding .........................................................................................................................10

5.6 Pocket drilling and device placing ...............................................................................................................10

5.7 Test execution .................................................................................................................................................... 11

5.8 End of loading ....................................................................................................................................................12

5.9 Back-filling of borehole ...................................................................................................................................12

6 Test results ..........................................................................................................................................................12

6.1 Basic equations .................................................................................................................................................12

6.2 Loading test ........................................................................................................................................................13

6.3 Constant pressure tests (procedure D) .......................................................................................................16

6.4 Uncorrected and corrected graphs ..............................................................................................................17

7 Test report ...........................................................................................................................................................18

7.1 General .................................................................................................................................................................18

7.2 Reporting of test results ..................................................................................................................................18

7.3 Choice of axis scaling ......................................................................................................................................20

7.4 Presentation of test results ............................................................................................................................20

Annex A (normative) Calibration and corrections ...................................................................................................21

Annex B (normative) Performing the test ..................................................................................................................24

Annex C (normative) Field report and G results ................................................................................................28

FDT

Annex D (normative) Accuracy and uncertainties ...................................................................................................30

Bibliography .....................................................................................................................................................................31

© ISO 2012 – All rights reserved iii
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SIST EN ISO 22476-5:2013
ISO 22476-5:2012(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.

ISO 22476-5 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 consists of the following parts, under the general title Geotechnical investigation and testing —

Field testing:
— Part 1: Electrical cone and piezocone penetration tests
— Part 2: Dynamic probing
— Part 3: Standard penetration test
— Part 4:Ménard pressuremeter test
— Part 5: Flexible dilatometer test
— Part 7: Borehole jack test
— Part 9: Field vane test
— Part 10: Weight sounding test [Technical Specification]
— Part 11: Flat dilatometer test [Technical Specification]
— Part 12: Mechanical cone penetration test (CPTM)
iv © ISO 2012 – All rights reserved
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SIST EN ISO 22476-5:2013
ISO 22476-5:2012(E)
Introduction

The results of dilatometer tests are used for deformation calculations provided that the range of stresses

applied in the test are representative of the stresses to be applied by the proposed structure. Local experience

normally improves the application of the results. In addition, for identification and classification of the ground,

the results of sampling (according to ISO 22475-1) from each borehole are available for the evaluation of the

tests. Identification and classification results (ISO 14688-1 and ISO 14689-1) are available from every separate

ground layer within the desired investigation depth (see EN 1997-2:2007, 2.4.1.4(2)P, 4.1(1)P and 4.2.3(2)P).

© ISO 2012 – All rights reserved v
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SIST EN ISO 22476-5:2013
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SIST EN ISO 22476-5:2013
INTERNATIONAL STANDARD ISO 22476-5:2012(E)
Geotechnical investigation and testing — Field testing —
Part 5:
Flexible dilatometer test
1 Scope

This part of ISO 22476 specifies the equipment requirements, execution of and reporting on flexible dilatometer tests.

NOTE This part of ISO 22476 fulfils the requirements for flexible dilatometer tests as part of geotechnical investigation

and testing according to EN 1997-1 [1] and EN 1997-2 [2].

This part of ISO 22476 is applicable to tests in ground stiff enough not to be adversely affected by the

drilling operation.

This part of ISO 22476 is applicable to four procedures for conducting a test with the flexible dilatometer.

This part of ISO 22476 applies to tests performed up to 1 800 m depth. Testing can be conducted either on

land or off-shore.
2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced document

(including amendments) applies.

ISO 10012, Measurement management systems — Requirements for measurement processes and

measuring equipment

ISO 14688-1, Geotechnical investigation and testing — Identification and classification of soil — Part 1:

Identification and description

ISO 14689-1, Geotechnical investigation and testing — Identification and classification of rock — Part 1:

Identification and description

ISO 22475-1, Geotechnical investigation and testing — Sampling methods and groundwater measurements —

Part 1: Technical principles for execution
EN 791, Drill rigs — Safety
EN 996, Piling equipment — Safety requirements
ENV 13005:1999, Guide to the expression of uncertainty in measurement
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply:
3.1.1
flexible dilatometer

cylindrical flexible probe which can be expanded by the application of hydraulic pressure or pressurized gas

and which contains transducers for the measurement of the displacements of the flexible membrane and of the

internal pressure
© ISO 2012 – All rights reserved 1
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SIST EN ISO 22476-5:2013
ISO 22476-5:2012(E)
3.1.2
equipment for flexible dilatometer test

complete equipment which is necessary to carry out a flexible dilatometer test: the probe, a hydraulic pump or

high-pressure gas in bottles, a measuring unit and cables to connect the probe to the measuring unit and the

hydraulic pump or the gas bottle

NOTE The parts which are necessary to bring the flexible dilatometer probe to the testing point are not included.

3.1.3
dilatometer sounding

whole series of successive operations in a given borehole, i.e. forming dilatometer pockets and performing

dilatometer tests in them
3.1.4
dilatometer test pocket

cylindrical cavity with circular cross-section drilled into the ground to receive the dilatometer probe

3.1.5
flexible dilatometer test

process of expanding the flexible dilatometer so as to press the flexible membrane against the pocket wall and

so measure the associated expansion as a function of pressure and time (see Figure 1)

3.1.6
nominal diameter of the pocket
diameter of the pocket at the time of application of the seating pressure
3.1.7
seating pressure

pressure during the expansion of the dilatometer at which the dilatometer membrane contacts the pocket wall

3.1.8
pressure increment

fixed increase of pressure in the flexible dilatometer, according to a pre-determined programme and recorded

in the control unit
NOTE It can also be a decrement.
3.1.9
diametral pocket displacement
displacement of pocket wall caused by an increase or decrease of any pressure
3.1.10
diameter increase/decrease

change in flexible dilatometer diameter and in pocket wall displacement caused by a pressure

increment/decrement, and recorded in the measurement unit
3.1.11
flexible dilatometer curve
graphical plot of pressure versus the associated pocket wall displacement
3.1.12
flexible dilatometer shear modulus, G
FDT

shear modulus calculated from the slope over various intervals of pressure and pocket wall displacement

3.1.13
flexible dilatometer modulus, E
FDT

Young’s modulus calculated from the slope over various intervals of pressure and pocket wall displacement

3.1.14
depth of test

distance between the ground level and the centre of the expanding length of the dilatometer measured along

the borehole axis (see Figure 2)
2 © ISO 2012 – All rights reserved
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SIST EN ISO 22476-5:2013
ISO 22476-5:2012(E)
3.1.15
operator
qualified person who carries out the test
3.2 Symbols and abbreviations
For the purposes of this document, the symbols given in Table 1 apply.
© ISO 2012 – All rights reserved 3
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SIST EN ISO 22476-5:2013
ISO 22476-5:2012(E)
Table 1 — Symbols
Symbol Description Unit
Membrane compression coefficient in variant B dilatometer mm.MPa
d Corrected pocket diameter mm
d Corrected pocket diameter at time t mm
1 1
d Corrected pocket diameter at time t mm
2 2
d Compression calibration cylinder diameter mm
d External diameter of the dilatometer mm
d Pocket diameter as read at the measuring unit mm
d Nominal diameter of the pocket after application of the seating pressure mm
E Young’s Modulus of flexible dilatometer test MPa
FDT
G Loading shear modulus in procedure C MPa
G Shear modulus of flexible dilatometer test MPa
FDT
G Loading shear modulus of flexible dilatometer test MPa
G Reloading shear modulus of flexible dilatometer test MPa
G Unloading shear modulus of flexible dilatometer test MPa
G Unloading/reloading shear modulus of flexible dilatometer test MPa
k Creep parameter mm
L Length of the expanding part of the probe mm
L Axial distance between transducer or LVDT section and membrane mm
clamping ring
L Length of the measuring segment of the dilatometer mm
p Applied pressure after correction MPa
p Constant full relief pressure for loops in procedure A MPa
1.1
p Pressure at reversal point at first loop MPa
p Pressure at reversal point at second loop MPa
p Pressure at reversal point at third loop MPa
p Maximum applied pressure during a test MPa
max
p Pressure loss associated with membrane stiffness MPa
p Range of applied pressure in loading phase no. i MPa
p Range of applied pressure in reloading phase no. i MPa
p Range of applied pressure in unloading phase no. i MPa
p Pressure as read at the measuring unit MPa
p Seating pressure MPa
p Yield pressure during dilatometer test in procedure C MPa
Time min
t Time 1 of a constant pressure test min
t Time 2 of a constant pressure test min
z Test depth m
Δd Increase of diametral displacement of the pocket mm
Corrected increase of diametral pocket displacement mm
Δp Increment of applied pressure as read on the control unit MPa
Δp Corrected increment of applied pressure MPa
ν Poisson’s ratio –
4 © ISO 2012 – All rights reserved
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SIST EN ISO 22476-5:2013
ISO 22476-5:2012(E)
4 Equipment
4.1 General

The test with the flexible dilatometer is performed by the expanding of a flexible dilatometer membrane placed

in the ground (see Figure 1). The pressure applied to, and the associated expansion of the probe are measured

and recorded so as to obtain a stress-displacement relationship for the ground as tested.

Key
1 ground surface
2 borehole wall
3 pocket
4 expanding dilatometer probe
p applied pressure
A-A axial section
B-B cross section
Figure 1 — Example of a flexible dilatometer test
© ISO 2012 – All rights reserved 5
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SIST EN ISO 22476-5:2013
ISO 22476-5:2012(E)

The equipment to carry out dilatometer tests shall consist of the components shown in Figure 2.

Key
1 setting rods (optional)
2 displacement measuring unit (obligatory)
3 pressure control unit (obligatory)
4 pressure source (obligatory)
5 signal cable (obligatory)
6 pressure line (obligatory)
7 sediment collection tube (optional)
8 flexible dilatometer probe (obligatory)
9 data logger (optional)
z test depth
Figure 2 — Schematic diagram of flexible dilatometer equipment

NOTE Sometimes, setting rods are necessary to push the probe into a tight pocket. They also allow orientation of the

instrument. They are also needed in case it becomes difficult to extract the probe at the end of the test and hammering

out is required.
Borehole diameters should be 76 mm, 96 mm, and 101 mm, according to ISO 22475-1.

The external diameter d of the flexible dilatometer when deflated shall be some 3 mm to 6 mm smaller than

the nominal diameter of the borehole.

The pressure applied to the membrane shall be measured by one or more electric transducers in the instrument

(see Figure 3).
4.2 Dilatometer probe

The expansion of the borehole shall be monitored by three or more electric transducers.

In variant A, the diametral displacement shall be measured with electric transducers, which shall penetrate the

membrane and shall directly bear on the borehole wall (Figure 3, left.). This variant shall be primarily used in

rocks (Rock dilatometer, RDT, see EN 1997-2:2007, 4.5).
6 © ISO 2012 – All rights reserved
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SIST EN ISO 22476-5:2013
ISO 22476-5:2012(E)
a) Variant A b) Variant B
© ISO 2012 – All rights reserved 7
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SIST EN ISO 22476-5:2013
ISO 22476-5:2012(E)
Key
1 membrane
2 pressure transducer
3 fluid or gas
4 displacement transducers
5 setting rod
6 pressure line
7 signal cable
8 metal insert at both ends of each displacement transducer (variant A)
9 sediment collection tube
10 membrane clamping ring
11 compass (if applicable)
d external diameter of the dilatometer
L length of the expanding part of the dilatometer
L axial distance between transducer and clamping ring
L length of the measuring segment of the dilatometer

NOTE 1 On this sketch there are three displacement transducers (No. 4) at 120° from each other.

NOTE 2 For variant A, the third No. 4 transducer is represented lengthwise with its metal inserts (No. 8) at both ends.

Figure 3 — Sketch of flexible dilatometer (not to scale)

The expanding length L of the probe shall exceed (5,5d+ L ). The measuring segment L shall not exceed 1,5d .

FD d d d d

In variant B, the diametral displacement shall be measured by electrical transducers placed at the inner wall

of the membrane (Figure 3 b). Because membrane compression influences the readings of pressure and

displacement, proper corrections shall be determined by corresponding calibration (see A.3). Variant B shall

be primarily used in soils (Soil dilatometer, SDT, see EN 1997-2:2007, 4.5).
4.3 Pressure control and displacement measuring units

The pressure control and displacement measuring units shall control the probe expansion and permit the

reading of liquid or gas pressure and displacement as a function of time.
The pressurizing system (3 and 4 in Figure 2) shall allow:
— reaching a pressure at least equal to 20 MPa;

— implementing a pressure increment of 0,5 MPa as measured on the pressure control unit in less than 20 s;

— stopping the injection when necessary.
4.4 Connecting lines

The pressure line and signal cable shall connect the pressure control and displacement measuring units to

the probe. The pressure line shall convey the fluid to the probe either parallel or coaxial with the signal cable.

4.5 Measurement and control accuracy
4.5.1 Time
The accuracy of the device used to measure time must be one second.
4.5.2 Pressure and displacement

The maximum uncertainty of measurement of the devices measuring pressure and displacement shall be as

specified in 5.4.
8 © ISO 2012 – All rights reserved
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SIST EN ISO 22476-5:2013
ISO 22476-5:2012(E)
4.5.3 Display of readings

At the site the pressure control and displacement measuring units shall give a simultaneous and instantaneous

display of the following readings: time, pressure of the fluid injected into the probe and diametral displacements.

4.5.4 Membrane compression calibration cylinder

The main dimensions of the steel cylinder serving the calibration for membrane compression shall be as follows:

— a known inside diameter which closely fits the deflated instrument;
— a wall thickness appropriate to the maximum pressure to be applied;
— a length appropriately greater than the expanding length of the instrument.
4.6 Data logging

If the data are not recorded manually, a data logging system shall be available to record the readings from the

transducers, calibration data and the resulting readings of pressure and displacement.

5 Test procedure
5.1 Safety requirements

Regarding environmental protection, national standards and local regulations shall be applied as long as

respective international standards are not available.
National safety regulations shall be followed, for instance for:
— personal health and safety equipment,
— clean air if working in confined spaces,
— ensuring the safety of the equipment.
Drill rigs shall be in accordance with EN 791 and EN 996.
5.2 Assembly of parts

The membrane and other parts of the probe shall be selected according to the expected ground conditions.

Then the probe shall be linked to the control unit through the connecting line/cable.

The system shall be filled with the working fluid.
5.3 Calibration of the testing device and corrections of readings
5.3.1 Calibration of the testing device

Before testing, the equipment shall have been calibrated (see Annex A). The following components of the

equipment shall be calibrated:
— displacement measuring system;
— pressure measuring system.

The calibration of the data logger system shall be conducted according to ISO 10012.

If any part of the system is repaired or exchanged, the calibration shall be verified.

Copies of the calibration documents shall be available at the job site.
© ISO 2012 – All rights reserved 9
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SIST EN ISO 2247
...

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