prEN ISO 22477-5

SLOVENSKI oSIST prEN ISO 22477-5:2005

PREDSTANDARD
junij 2005
Geotehnično preiskovanje in preskušanje – Preskušanje geotehničnih
konstrukcij - 5. del: Preskušanje sider (ISO/DIS 22477-5:2005)
Geotechnical investigation and testing - Testing of geotechnical structures - Part 5:
Testing of anchorages (ISO/DIS 22477-5:2005)
ICS 93.020 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2005
ICS
English version
Geotechnical investigation and testing - Testing of geotechnical
structures - Part 5: Testing of anchorages (ISO/DIS 22477-
5:2005)
Reconnaissance et essais géotechniques - Essais de
structures géotechniques - Partie 5: Essais d'ancrages
(ISO/DIS 22477-5:2005)
This draft European Standard is submitted to CEN members for parallel enquiry. It has been drawn up by the Technical Committee
CEN/TC 341.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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 Management Centre has the same
status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN ISO 22477-5:2005: E
worldwide for CEN national Members.

Foreword
This document (prEN ISO 22477-5:2005) has been prepared by Technical Committee
CEN/TC 341 "Geotechnical Investigation and Testing", the secretariat of which is held by DIN,
in collaboration with Technical Committee ISO/TC 182 "Geotechnics".

This document is currently submitted to the parallel Enquiry.

DRAFT INTERNATIONAL STANDARD ISO/DIS 22477-5
ISO/TC 182/SC 1 Secretariat: DIN
Voting begins on: Voting terminates on:
2005-04-21 2005-09-21
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION
Geotechnical investigation and testing — Testing of
geotechnical structures —
Part 5:
Testing of anchorages
Reconnaissance et essais géotechniques — Essais de structures géotechniques —
Partie 5: Essais d'ancrages
ICS 93.020
ISO/CEN PARALLEL ENQUIRY
This draft International Standard is a draft standard developed within the European Committee for
Standardization (CEN) and processed under the CEN-lead mode of collaboration as defined in the
Vienna Agreement. The document has been transmitted by CEN to ISO for circulation for ISO member
body voting in parallel with CEN enquiry. Comments received from ISO member bodies, including those
from non-CEN members, will be considered by the appropriate CEN technical body. Should this DIS be
accepted, a final draft, established on the basis of comments received, will be submitted to a parallel two-
month FDIS vote in ISO and formal vote in CEN.
In accordance with the provisions of Council Resolution 15/1993 this document is circulated in
the English language only.
Conformément aux dispositions de la Résolution du Conseil 15/1993, ce document est distribué
en version anglaise seulement.
To expedite distribution, this document is circulated as received from the committee secretariat.
ISO Central Secretariat work of editing and text composition will be undertaken at publication
stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.
THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
© International Organization for Standardization, 2005

ISO/DIS 22477-5
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©
ii ISO 2005 – All rights reserved

ISO/DIS 22477-5
Contents Page
Foreword. vii
Introduction . viii
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols. 1
3.1 Terms and definitions. 1
3.2 Symbols . 2
4 Equipment . 4
4.1 Test loading set-up. 4
4.2 Reaction system . 5
4.3 Loading device. 5
4.4 Load measurement. 6
4.5 Displacement measurement . 6
4.6 Time and temperature measurement. 6
5 Test procedures . 7
5.1 Method 1 : Cyclic tension test A. 7
5.2 Method 2 : Cyclic tension test B . 7
5.3 Method 3 : Maintained tension test. 7
6 Test report . 7
6.1 Investigation and Suitability tests. 7
6.2 Acceptance test . 8
Annex A (normative) Test Procedure: Method 1. 9
A.1 Investigation test procedure. 9
A.1.1 General. 9
A.1.2 Test anchors. 9
A.1.3 Date of test . 10
A.1.4 Test execution. 10
A.1.5 Test results. 12
A.2 Suitability test procedure. 12
A.2.1 General. 12
A.2.2 Test anchor. 13
A.2.3 Date of test . 13
A.2.4 Test execution. 13
A.2.5 Test results. 15
A.3 Acceptance test procedure. 16
A.3.1 General. 16
A.3.2 Date of test . 16
A.3.3 Test execution. 16
A.3.4 Test results. 18
Annex B (informative) Examples of test reports: Method 1. 20
B.1 Investigation test . 21
B.2 Suitability test . 22
B.3 Acceptance test . 23
Annex C (normative) Test procedure: Method 2. 24
C.1 Investigation test procedure. 24
C.1.1 General. 24
C.1.2 Test anchors. 24
DRAFT 2005
ISO/DIS 22477-5
C.1.3 Date of test. 25
C.1.4 Test execution . 25
C.1.5 Test results . 27
C.2 Suitability test procedure . 28
C.2.1 General . 28
C.2.2 Test anchor. 28
C.2.3 Date of test. 28
C.2.4 Test execution . 28
C.2.5 Test results . 31
C.3 Acceptance test procedure. 31
C.3.1 General . 31
C.3.2 Date of test. 31
C.3.3 Test execution . 32
C.3.4 Test results . 34
Annex D (informative) Examples of test reports: Method 2 . 35
D.1 Investigation test. 36
D.2 Suitability test. 37
D.3 Acceptance test. 38
Annex E (normative) Test procedure: Method 3 . 39
E.1 Investigation test procedure. 39
E.1.1 General . 39
E.1.2 Test anchors. 39
E.1.3 Date of test. 40
E.1.4 Test execution . 40
E.1.5 Test results . 42
E.2 Suitability test procedure . 42
E.2.1 General . 42
E.2.2 Test anchor. 42
E.2.3 Date of test. 43
E.2.4 Test execution . 43
E.2.5 Test results . 45
E.3 Acceptance test procedure. 46
E.3.1 General . 46
E.3.2 Date of test. 46
E.3.3 Test execution . 46
E.3.4 Test results . 49
Annex F (informative) Examples of test reports: Method 3. 50
F.1 Investigation test. 51
F.2 Suitability test. 52
F.3 Acceptance test. 53
Annex G (informative) Guidance on allowable αααα : Methods 1 and 3 . 54
G.1 Determination of αααα . 54
G.2 Method 1. 54
G.2.1 Suitability test. 54
G.2.2 Acceptance test. 55
G.3 Method 3. 55
G.3.1 Suitability test. 55
G.3.2 Acceptance test. 55
Annex H (informative) Guidance on allowable k : Method 2. 57
i
H.1 Permissible cumulative loss of load k . 57
l
H.2 Investigation test. 57
H.3 Suitability test. 57
H.4 Acceptance test. 57
Annex I (informative) Guidance on test interpretation: Methods 1 and 3. 58
I.1 Determination of anchor critical resistance R . 58
c
I.2. Determination of anchor pull out resistance R . 58
a
iv © ISO 2004 – All rights reserved
DRAFT 2005
ISO/DIS 22477-5
Annex J (informative) Guidance on test interpretation: Method 2 . 61
J.1 Determination of Anchor critical resistance R . 61
c
J.2. Determination of Anchor pull out resistance R . 61
a
Figures
Figure 1 — Sketch of a ground anchor (details of anchor head and head protection omitted). 4
Figure 2 — Test loading set-up (example for an investigation test). 5
Figure A.1 — Loading procedure – Investigation test method 1 . 11
Figure A.2 — Loading procedure – Suitability test method 1 . 14
Figure A.3 — Loading procedure – Acceptance test method 1 . 17
Figure B.1 — Cyclic tension test A (Method 1) – Example of investigation test report . 21
Figure B.2 — - Cyclic tension test A (Method 1) – Example of suitability test report. 22
Figure B.3 — Cyclic tension test A (Method 1) – Example of acceptance test report. 23
Figure C.1 — Loading procedure – Investigation test method 2 . 26
Figure C.2 — Loading procedure – Suitability test method 2 . 30
Figure C.3 — Loading procedure – Acceptance test method 2 . 33
Figure D.1 — Cyclic tension test B (Method 2) – Example of investigation test report . 36
Figure D.2 — Cyclic tension test B (Method 2) – Example of suitability test report. 37
Figure D.3 — Cyclic tension test B (Method 2) – Example of acceptance test report. 38
Figure E.1 — Loading procedure – Investigation test method 3 . 41
Figure E.2 — Loading procedure – Suitability test method 3 . 44
Figure E.3 — Loading procedure – Acceptance test method 3 . 47
Figure F.1 — Maintained tension test (Method 3) – Example of investigation test report . 51
Figure F.2 — Maintained tension test (Method 3) – Example of suitability test report. 52
Figure F.3 — Maintained tension test (Method 3) – Example of acceptance test report. 53
Figure G.1 — Determination of the slope of the stabilization curve at constant load. 54
Figure I.1 — Determination of the anchor critical resistance – Investigation test. 58
Figure I.2 — Determination of the anchor pull out resistance – Investigation test . 60
Figure J.1 — Determination of the anchor critical resistance – Investigation test. 61
Figure J.2 — Determination of the anchor pull out resistance – Investigation test . 62
DRAFT 2005
ISO/DIS 22477-5
Tables
Table A.1 — Loading procedure – Investigation test method 1 .11
Table A.2 — Loading procedure – Suitability test method 1 .15
Table A.3 — Loading procedure – Acceptance test method 1 .18
Table C.1 — Loading procedure – Investigation test method 2 .27
Table C.2 — Loading procedure – Suitability test method 2 .30
Table C.3 — Loading procedure – Acceptance test method 2 .33
Table E.1 — Loading procedure – Investigation test method 3 .41
Table E.2 — Loading procedure – Suitability test method 3 .45
Table E.3 — Loading procedure – Acceptance test method 3 .48
Table E.4 — Additional load steps where friction occurs - Acceptance test method 3.48
Table H.1 — Permissible cumulative loss of load k .57
l
vi © ISO 2004 – All rights reserved
DRAFT 2005
ISO/DIS 22477-5
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 22477-5 was prepared by Technical Committee ISO/TC 182, Geotechnics, Subcommittee SC 1,
Geotechnical investigation and testing.
ISO 22477 consists of the following parts, under the general title Geotechnical investigation and testing —
Testing of geotechnical structures:
 Part 1: Pile load test by static axially loaded compression
 Part 2: Pile load test by static axially loaded tension
 Part 3: Pile load test by static transversally loaded tension
 Part 4: Pile load test by dynamic axially loaded compression test
 Part 5: Testing of anchorages
 Part 6: Testing of nailing
 Part 7: Testing of reinforced fill
DRAFT 2005
ISO/DIS 22477-5
Introduction
Various in-situ tests may be carried out on ground anchors (Investigation test, Suitability test, Acceptance test)
and different stressing procedures may be followed (method 1 : cyclic tension test A, method 2 : cyclic tension
test B; method 3 : maintained tension test) up to a proof tension or up to the ultimate soil-anchor resistance.
The present document concerns method 1, method 2 and method 3.
viii © ISO 2004 – All rights reserved
DRAFT 2005
DRAFT INTERNATIONAL STANDARD ISO/DIS 22477-5
Geotechnical investigation and testing — Testing of
geotechnical structures — Part 5: Testing of anchorages
1 Scope
(1) This Standard establishes specifications for the execution of tension load tests where a ground anchor, as
defined in EN 1537, is loaded by step (method 3) or in incremental cycles (methods 1 and 2) from a datum
load to a maximum test load. The displacement of the anchor head is measured over a period of time at each
step (method 3) or at maximum load in each incremental cycle (method 1). The loss of load is measured over
a period of time, at maximum load after lock off, in each incremental cycle (method 3)
(2) This standard is applicable to pre-stressed anchors consisting of an anchor head, a tendon free length
and a fixed tendon length bonded to the ground by grout.
(3) This standard provides specifications for three types of tension tests : investigation tests, suitability tests
and acceptance tests.
(4) The standard provides specifications for the experimental devices, the measurement apparatus, the test
procedures, the definition and the presentation of the test results and the content of records.
NOTE The interpretation of the test results is not in the scope of this standard. Guidance is given however (in an
informative annex) on the determination of the pull out resistance R of an anchor on the basis of Investigation tests and
a
for checking of the displacement behaviour of an anchor on the basis of Suitability tests and Acceptance tests.
(5) This standard shall be used in conjunction with EN 1997-1 and EN 1537.
NOTE Section 8 of EN 1997-1:2004 provides specifications for the design of temporary and permanent anchors on
the basis of Suitability tests and the checking of the design on the basis of Acceptance tests. EN 1537 provides
specifications for the execution of anchors bounded to the ground.
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 any amendments) applies.
EN 1537, Execution of special geotechnical works – Ground anchors
EN 1997-1, Eurocode 7 : Geotechnical design – Part 1 : General rules
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1997-1 and EN 1537 and the
following apply.
DRAFT 2005
ISO/DIS 22477-5
3.1.1
preliminary anchor
an anchor which is installed before the commencement of the anchoring works for the purpose of establishing
the suitability of the chosen type of anchors and for confirming its design, dimensions and tension resistance.
NOTE Preliminary anchors loaded to failure may not be included in the structure
3.1.2
working anchor
anchor that is part of a structure
3.1.3
estimated anchor pull out resistance
ultimate resistance of the ground-anchor interaction determined on the basis of comparable experience or
numerical calculation before the test
3.1.4
anchor pull-out resistance
limit pull out force of an anchor deduced from an investigation test
3.1.5
anchor critical resistance
tension force of an anchor above which important displacement under constant load occurs.
3.1.6
anchor tendon resistance
ultimate structural resistance of an anchor tendon.
3.2 Symbols
A Cross sectional area of anchor tendon
t
E Elastic modulus of anchor tendon
t
f Friction loss as a percentage of P
p
k Load loss
l
L Apparent tendon free length
app
L External length of tendon measured from the tendon anchorage in the anchor head to the
e
anchorage point in the stressing jack
L Fixed anchor length
fixed
L Free anchor length
free
L Tendon length
t
L Tendon bond length
tb
L Tendon free length
tf
P Load on an anchor
P Datum load
a
P Critical creep load
c
2 © ISO 2004 – All rights reserved
DRAFT 2005
ISO/DIS 22477-5
P Design value of P
d
P Anchor lock-off load
o
P Proof load
p
P Anchor ultimate load determined in an Investigation test
u
R Anchor pull-out resistance
a
R Anchor critical resistance
c
R Estimated anchor pull-out resistance
e
R Design value of the structural tensile resistance of an anchor
t;d
s Anchor head displacement
s Anchor head displacement under datum load P
o a
t Time from application of load increment or load lock-off
α Slope of “creep displacement vs. lg time” plot
∆ P Difference between proof load and anchor datum load
∆ P Friction loss
f
∆ s Measured extension of anchor tendon under load increment ∆P
DRAFT 2005
ISO/DIS 22477-5
Key
1 Anchorage point at jack during stressing
2 Anchorage point at anchor head in service
3 Bearing plate
4 Load transfer block
5 Structural element
6 Soil/rock
7 Borehole
8 Debonding sleeve
9 Tendon
10 Grout body
Figure 1 — Sketch of a ground anchor (details of anchor head and head protection omitted)
4 Equipment
4.1 Test loading set-up
(1) The test loading set-up comprises of a stressing device, displacement and load monitoring devices, a
reaction system, associated locking nuts, extension pieces and packing, etc.
NOTE An example of an investigation test loading set-up is given in Figure 2. Where possible it is better to measure
the load between the loading device and the bearing plate to avoid the determination of the friction in the jack.
(2) The test loading system shall be designed to operate safely up to the maximum test load (P ).
p
4 © ISO 2004 – All rights reserved
DRAFT 2005
ISO/DIS 22477-5
Key
1 Displacement monitoring
2 Load monitoring
3 Stressing device
4 Reaction system
5 Tendon
6 Hydraulic system
Figure 2 — Test loading set-up (example for an investigation test)
4.2 Reaction system
(1) The reaction system shall be designed to have a structural resistance at least equal to the maximum test
load (P ), according to the relevant EN standards.
p
(2) The reaction system should be designed to avoid excessive deformation at the maximum test load.
NOTE In some cases (for example anchored sheet-pile walls) this is not possible due to soil conditions or staged
construction. In that case extra measurements should be performed to determine the displacement of the structure itself
during testing.
(3) The reaction system should be designed so as not to affect the test results, nor to impose loads in excess
of the safe bearing capacity of the retaining structure.
4.3 Loading device
(1) The stressing device, normally an hydraulically operated jack, shall have a capacity at least equal to the
maximum test load (P ).
p
(2) The extension of the jack should be sufficient to avoid reseating during the test.
NOTE For Investigation tests, the extension of the jack should be at least 10 mm greater than the theoretical
extension of the tendon length.
(3) The equipment (hydraulic jack, pumping unit, etc.) shall be capable of safely tensioning the tendon
smoothly and axially, in accordance with the test procedure.
NOTE The load shall not be applied or released quicker than 10 kN per second (see Annexes A, C and E test
procedures).
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ISO/DIS 22477-5
(4) Stressing equipment for bar and strand tendons should tension the complete tendon as a single unit.
NOTE Stressing equipment which tensions individual strands not simultaneously should be provided with or be
supplemented by measuring devices which establish the total load in the multiple strands at any time during testing.
Alternatively accurate lift-off checks should be undertaken.
4.4 Load measurement
(1) The load P shall be measured with an appropriate device.
NOTE The load may be measured either indirectly (e.g by means of a calibrated pressure gauge, monitoring the
hydraulic pressure in the stressing device) or directly, by the use of a load cell.
(2) The allowable minimum accuracy of the measured load shall be the larger values of :
 2 % of the measured value or 10 kN, for methods 1 and 3;
 0,5 % of the measured value or 5 kN, for method 2.
NOTE Where relevant, the calibration test shall include the stressing device.
(3) Pressure gauges and load cells used to measure the load shall be calibrated for less than 6 months prior
to the test.
NOTE The calibration certificates shall be made available for inspection on site at all times.
4.5 Displacement measurement
(1) The displacements of the tendon head shall be measured with an appropriate device.
NOTE The support for the displacement gauges shall be remote from the stressing device and reaction system and
be sufficiently rigid so as not to be influenced by climatic effects, or background vibrations.
(2) The allowable minimum accuracy on the measured displacement shall be the larger values of 0,1 mm or 1
% of the measured value.
(3) The displacement gauges used shall be calibrated for less than 1 year prior to the test.
(4) Displacement gauges should be capable of monitoring the extension of the anchor head, throughout the
test, without the need for reseating.
(5) Where relevant, the displacement of the reaction system should also be measured with an appropriate
device, throughout the test.
NOTE e. g where the reaction system cannot be designed to avoid excessive deformation (as for anchored sheet-pile
walls) due to soil conditions or staged construction.
4.6 Time and temperature measurement
(1) The accuracy of the measured time shall be equal or less than 1 s.
(2) The accuracy of the measured temperature shall equal or be less than 1 °C.
6 © ISO 2004 – All rights reserved
DRAFT 2005
ISO/DIS 22477-5
5 Test procedures
5.1 Method 1 : Cyclic tension test A
The test procedure for Method 1 shall be carried out according to Annex A. Examples of investigation,
suitability and acceptance test reports are given in Annex B.
5.2 Method 2 : Cyclic tension test B
The test procedure for Method 2 shall be carried out according to Annex C. Examples of investigation,
suitability and acceptance test reports are given in Annex D.
5.3 Method 3 : Maintained tension test
The test procedure for Method 3 shall be carried out according to Annex E. Examples of investigation,
suitability and acceptance test reports are given in Annex F.
6 Test report
6.1 Investigation and Suitability tests
(1) The test report shall at least include:
a) reference to all relevant standards;
b) the following specifications concerning the test anchor;
1) location and type of anchor;
2) date of installation;
3) observations related to the execution, likely to have an influence on the test results;
4) geometrical data of the anchor and mechanical properties of the anchor material;
5) level of its top, its base and of the ground around it.
c) the following factors concerning soil conditions;
1) location of the closest geotechnical investigation profiles;
2) reference to the site investigation report.
d) the following factors concerning the anchor test:
1) reference of the organism which has carried out the test;
2) date of the test;
3) characteristics of the loading system;
4) description of all monitoring systems and their components;
5) sketch of the instrumentation of the test anchor;
6) observations related to the execution of the test, likely to have an influence on the results.
DRAFT 2005
ISO/DIS 22477-5
e) if relevant, the following test results based on collected data:
1) plot “anchor head displacement versus anchor load” at the end of each load step;
2) plot “anchor head displacement versus time” for each load step;
3) plot “α versus anchor load”;
4) anchor critical resistance R ;
c
5) anchor pull-out resistance R ;
a
6) plot “load-loss versus time” for each load step and after lock-off;
7) plot “k versus anchor load” .
l
NOTE Examples of a test report are given in Annexes B.1, D.1 and F.1 for the Investigation test and in Annexes B.2,
D.2 and F.2 for the Suitability test.
(2) Tables of numerical values of the collected data shall be provided in the annexes of the test report.
6.2 Acceptance test
(1) The test report shall at least include:
a) reference to all relevant standards;
b) the following specifications concerning the test anchor;
1) location and type of anchor;
2) date of installation.
c) the following factors concerning the anchor test:
1) reference of the organism which has carried out the test;
2) date of the test.
d) if relevant, the following test results based on collected data :
1) plot “anchor head displacement versus anchor load”;
2) plot “anchor head displacement versus time” at the proof load;
3) anchor head displacement at the proof load;
4) α value at the proof load;
5) plot “load-loss versus time” for each load step and after lock-off;
6) plot “k versus anchor load”;
l
7) apparent tendon free length.
NOTE Examples of test report are given in Annexes B.3, D.3 and F.3 .
8 © ISO 2004 – All rights reserved
DRAFT 2005
ISO/DIS 22477-5
Annex A
(normative)
Test Procedure: Method 1
A.1 Investigation test procedure
A.1.1 General
(1) An Investigation test is a test in which an axial load is applied incrementally in at least six cycles to a
ground anchor up to a proof load P , which is determined to reach failure of the interaction soil-anchor. At the
p
maximum load of each cycle the load is maintained constant during a specified period of time. The test
involves measurement of tendon head displacement versus applied load and, for each load step,
measurement of tendon head displacement versus time.
NOTE Investigation tests are usually carried out
...