SIST EN ISO 22476-14:2020
(Main)Geotechnical investigation and testing - Field testing - Part 14: Borehole dynamic probing (ISO 22476-14:2020)
Geotechnical investigation and testing - Field testing - Part 14: Borehole dynamic probing (ISO 22476-14:2020)
The standard comprises requirements for ground investigations by means of the borehole dynamic probing (BDP) as part of the geotechnical investigations
Geotechnische Erkundung und Untersuchung - Felduntersuchungen - Teil 14: Bohrlochrammsondierung (ISO 22476-14:2020)
Dieses Dokument legt die Anforderungen an die Geräte, die Durchführung und die Berichtserstellung für die Bohrlochrammsondierung fest.
ANMERKUNG Dieses Dokument erfüllt die Anforderungen an die Bohrlochrammsondierung im Rahmen der geotechnischen Erkundung und Untersuchung nach EN 1997 1 und EN 1997 2.
Dieses Dokument legt geräte- und ausführungstechnische Anforderungen fest, um Fehlbeurteilungen der Baugrundverhältnisse weitgehend zu vermeiden und geräte- und ausführungstechnisch bedingte Streuungen der Sondierergebnisse zu begrenzen.
Reconnaissance et essais géotechniques - Essais en place - Partie 14: Sondage dynamique au carrottier (ISO 22476-14:2020)
Ce document précise les exigences en matière d'équipement, d'exécution et de compte-rendu du sondage dynamique des trous de forage.
NOTE Ce document répond aux exigences relatives à la prospection dynamique des trous de sonde dans le cadre de l'étude et des essais géotechniques conformément aux normes EN 1997-1 et EN 1997-2.
Le document spécifie les exigences techniques en matière d'équipement et de mise en œuvre, afin d'éviter dans une large mesure les évaluations incorrectes des conditions du sous-sol et de limiter la dispersion des résultats de sondage due à l'équipement et à la mise en œuvre.
Geotehnično preiskovanje in preskušanje - Preskušanje na terenu - 14. del: Dinamični preskus vrtin (ISO 22476-14:2020)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 22476-14:2020
01-maj-2020
Geotehnično preiskovanje in preskušanje - Preskušanje na terenu - 14. del:
Dinamični preskus vrtin (ISO 22476-14:2020)
Geotechnical investigation and testing - Field testing - Part 14: Borehole dynamic
probing (ISO 22476-14:2020)
Geotechnische Erkundung und Untersuchung - Felduntersuchungen - Teil 14:
Bohrlochrammsondierung (ISO 22476-14:2020)
Reconnaissance et essais géotechniques - Essais en place - Partie 14: Sondage
dynamique au carrottier (ISO 22476-14:2020)
Ta slovenski standard je istoveten z: EN ISO 22476-14:2020
ICS:
93.020 Zemeljska dela. Izkopavanja. Earthworks. Excavations.
Gradnja temeljev. Dela pod Foundation construction.
zemljo Underground works
SIST EN ISO 22476-14:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 22476-14:2020
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SIST EN ISO 22476-14:2020
EN ISO 22476-14
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2020
EUROPÄISCHE NORM
ICS 93.020
English Version
Geotechnical investigation and testing - Field testing - Part
14: Borehole dynamic probing (ISO 22476-14:2020)
Reconnaissance et essais géotechniques - Essais en Geotechnische Erkundung und Untersuchung -
place - Partie 14: Sondage dynamique au carrottier Felduntersuchungen - Teil 14:
(ISO 22476-14:2020) Bohrlochrammsondierung (ISO 22476-14:2020)
This European Standard was approved by CEN on 1 March 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 22476-14:2020 E
worldwide for CEN national Members.
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SIST EN ISO 22476-14:2020
EN ISO 22476-14:2020 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 22476-14:2020
EN ISO 22476-14:2020 (E)
European foreword
This document (EN ISO 22476-14:2020) 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 September 2020, and conflicting national standards
shall be withdrawn at the latest by September 2020.
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 22476-14:2020 has been approved by CEN as EN ISO 22476-14:2020 without any
modification.
3
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SIST EN ISO 22476-14:2020
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SIST EN ISO 22476-14:2020
INTERNATIONAL ISO
STANDARD 22476-14
First edition
2020-02
Geotechnical investigation and
testing — Field testing —
Part 14:
Borehole dynamic probing
Reconnaissance et essais géotechniques — Essais en place —
Partie 14: Sondage dynamique au carrottier
Reference number
ISO 22476-14:2020(E)
©
ISO 2020
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SIST EN ISO 22476-14:2020
ISO 22476-14:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 22476-14:2020
ISO 22476-14:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Equipment . 2
5 Test procedure . 6
5.1 General . 6
5.2 Test preparation . 6
5.3 Equipment checks and calibration . 7
5.4 Probing procedure . 7
5.5 Field records . 7
6 Test evaluation and result mapping . 8
7 Qualitative evaluation and derivation of geotechnical parameters . 8
7.1 General . 8
7.2 Qualitative evaluation . 9
7.3 Derived values . 9
Annex A (normative) Header sheet with measuring record for borehole dynamic probing .10
Annex B (informative) Examples of relations for considering the effect of ground water
and relations between the results from probing with different probes as well as the
derivation of geotechnical parameters .12
Bibliography .20
© ISO 2020 – All rights reserved iii
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SIST EN ISO 22476-14:2020
ISO 22476-14:2020(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
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.
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 © ISO 2020 – All rights reserved
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SIST EN ISO 22476-14:2020
INTERNATIONAL STANDARD ISO 22476-14:2020(E)
Geotechnical investigation and testing — Field testing —
Part 14:
Borehole dynamic probing
1 Scope
This document specifies the equipment requirements, execution of and reporting on borehole dynamic
probing.
NOTE This document fulfills the requirements for borehole dynamic probing as part of the geotechnical
investigation and testing according to EN 1997-1 and EN 1997-2.
The document specifies technical requirements in respect to equipment and implementation, in order
to extensively prevent incorrect appraisals of the subsoil conditions and to limit scatter in the probing
results due to equipment and implementation.
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 10025-2, Hot rolled products of structural steels — Part 2: Technical delivery conditions for non-alloy
structural steels
ISO 14688-1, Geotechnical investigation and testing — Identification and classification of soil — Part 1:
Identification and description
ISO 22475-1, Geotechnical investigation and testing — Sampling methods and groundwater
measurements — Part 1: Technical principles for execution
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
probing
indirect subsoil exploration method in soils normally by driving a cone vertically while measuring the
penetration resistance (3.4) to derive geotechnical parameters
3.2
borehole dynamic probing
probing (3.1) in the borehole, which is carried out by driving by impact from the borehole base over a
defined penetration depth
Note 1 to entry: Here the impact device is directly above the probe in the borehole.
© ISO 2020 – All rights reserved 1
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SIST EN ISO 22476-14:2020
ISO 22476-14:2020(E)
3.3
number of blows N
30
blows required for the probe to penetrate by 30 cm, in relation to the depth ranges of 15 cm to 45 cm of
the probe depth
3.4
penetration resistance
sum of the tip resistance and negligible skin friction recorded by the number of blows N30 (3.3)
3.5
derived value
value of a geotechnical parameter determined by theory, correlation or empirically
Note 1 to entry: The derived values are used as an initial basis for determining characteristic values according to
EN 1997-1:2010, 2.4.3.
4 Equipment
The device for the borehole dynamic probing is shown in Figure 1. The technical data are shown in
Table 1.
The device is lowered into the borehole with an encased impact device on the rope and the probe is
driven in from there without a rod.
2 © ISO 2020 – All rights reserved
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SIST EN ISO 22476-14:2020
ISO 22476-14:2020(E)
Key
1 rope 8 drain plug
2 packing box 9 borehole base
3 lifting rod 10 cone
4 automatic releasing device 11 borehole depth
5 hammer 12 test range
6 hollow cylinder, water tight 13 penetration under the weight of the device
7 anvil l probe length
Figure 1 — Device for borehole dynamic probing
Table 1 — Technical data
Technical data Symbol Unit Value
2
Tip cross-section area A cm 20
c
a
Production tolerances.
b
These are the parts (hollow cylinder, anvil and probe) without the moving parts for lifting and releasing the hammer.
c
There is no need to indicate production tolerances here.
© ISO 2020 – All rights reserved 3
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SIST EN ISO 22476-14:2020
ISO 22476-14:2020(E)
Table 1 (continued)
Technical data Symbol Unit Value
a
Tip diameter d 50,5 ± 0,5
mm
Wear limit d 49
min
a
Mass of hammer m kg 63,5 ± 0,5
a
Height of fall h m 0,76 ± 0,01
c
Diameter of the lifting rod D mm 45
h
c
External diameter of the cone d mm 120
b c
Mass of the drive-in device without additional weight m kg 91 ± 2
1
c
Cone length l m 0,9
Test depth from borehole base t m 0,45
a
Production tolerances.
b
These are the parts (hollow cylinder, anvil and probe) without the moving parts for lifting and releasing the hammer.
c
There is no need to indicate production tolerances here.
The hammer shall be located in a watertight hollow cylinder. In case of application depths of more than
20 m under water, additional weights shall be used between the cone and hollow cylinder (see Figure 2).
4 © ISO 2020 – All rights reserved
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SIST EN ISO 22476-14:2020
ISO 22476-14:2020(E)
Key
1 hammer
2 hollow cylinder
3 anvil
4 drain plug
5 additional weight
6 borehole base
7 cone
8 penetration under the weight of the device
Figure 2 — Location of the additional weight
The dimensions of the cone tip are given in Table 1 and Figure 3. The material shall correspond to a
steel quality S 235 JR minimum according to EN 10025-2.
© ISO 2020 – All rights reserved 5
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SIST EN ISO 22476-14:2020
ISO 22476-14:2020(E)
Key
d tip diameter
l tip length
s
Figure 3 — Cone dimensions
5 Test procedure
5.1 General
The initial depths for the borehole dynamic probing in a borehole shall be specified.
The probing device defined in this document may be used to explore the subsoil — depending on its
state and the boring device used — down to depths of ≈60 m.
Deviations from this document and their effects on the result shall be substantiated and reported. The
symbols are shown in Table 2.
Table 2 — Symbols
Symbol Name Unit
N number of blows between 15 cm to 45 cm —
30
N number of blows between 0 cm to 15 cm —
0-15
N number of blows between 15 cm to 30 cm —
...
SLOVENSKI STANDARD
oSIST prEN ISO 22476-14:2019
01-julij-2019
Geotehnično preiskovanje in preskušanje - Preskušanje na terenu - 14. del:
Dinamični preskus vrtin (ISO/DIS 22476-14:2019)
Geotechnical investigation and testing - field testing - Part 14: Borehole dynamic probing
(ISO/DIS 22476-14:2019)
Geotechnische Erkundung und Untersuchung - Felduntersuchungen - Teil 14:
Bohrlochrammsondierung (ISO/DIS 22476-14:2019)
Reconnaissance et essais géotechniques - Essais en place - Partie 14: Sondage
dynamique au carrottier (ISO/DIS 22476-14:2019)
Ta slovenski standard je istoveten z: prEN ISO 22476-14
ICS:
93.020 Zemeljska dela. Izkopavanja. Earthworks. Excavations.
Gradnja temeljev. Dela pod Foundation construction.
zemljo Underground works
oSIST prEN ISO 22476-14:2019 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN ISO 22476-14:2019
---------------------- Page: 2 ----------------------
oSIST prEN ISO 22476-14:2019
DRAFT INTERNATIONAL STANDARD
ISO/DIS 22476-14
ISO/TC 182 Secretariat: BSI
Voting begins on: Voting terminates on:
2019-04-12 2019-07-05
Geotechnical investigation and testing — Field testing —
Part 14:
Borehole dynamic probing
Reconnaissance et essais géotechniques — Essais en place —
Partie 14: Sondage dynamique au carrottier
ICS: 93.020
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
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
ISO/CEN PARALLEL PROCESSING
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
Reference number
NATIONAL REGULATIONS.
ISO/DIS 22476-14:2019(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2019
---------------------- Page: 3 ----------------------
oSIST prEN ISO 22476-14:2019
ISO/DIS 22476-14:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 22476-14:2019
ISO/DIS 22476-14:2019(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Equipment . 2
5 Test procedure . 6
5.1 General . 6
5.2 Test preparation . 6
5.3 Equipment checks and calibration . 7
5.4 Probing procedure . 7
5.5 Field records . 7
6 Test evaluation and result mapping . 8
7 Qualitative evaluation and derivation of geotechnical parameters . 8
7.1 General . 8
7.2 Qualitative evaluation . 9
7.3 Derived values . 9
Annex A (normative) Header sheet with measuring record for borehole dynamic probing .10
Annex B (informative) Examples of relations for considering the effect of ground water
and relations between the results from probing with different probes as well as the
derivation of geotechnical parameters .12
Bibliography .20
© ISO 2019 – All rights reserved iii
---------------------- Page: 5 ----------------------
oSIST prEN ISO 22476-14:2019
ISO/DIS 22476-14:2019(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.
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 on 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 the following
URL: www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee [or Project Committee] ISO/TC [or ISO/PC] ###,
[name of committee], Subcommittee SC ##, [name of subcommittee].
This second/third/… edition cancels and replaces the first/second/… edition (ISO #####:####), which
has been technically revised.
The main changes compared to the previous edition are as follows:
— xxx xxxxxxx xxx xxxx
A list of all parts in the ISO ##### series can be found on the ISO website.
iv © ISO 2019 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 22476-14:2019
DRAFT INTERNATIONAL STANDARD ISO/DIS 22476-14:2019(E)
Geotechnical investigation and testing — Field testing —
Part 14:
Borehole dynamic probing
1 Scope
This part of ISO 22476 specifies the equipment requirements, execution of and reporting on borehole
dynamic probing.
NOTE This document fulfills the requirements for borehole dynamic probing as part of the geotechnical
investigation and testing according to EN 1997-1 and EN 1997-2.
The standard specifies technical requirements in respect to equipment and implementation, in order to
extensively prevent incorrect appraisals of the subsoil conditions as well as limit scatter in the probing
results due to equipment and implementation.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 10025-2, Hot rolled products of structural steels - Part 2: Technical delivery conditions for non-alloy
structural steels
EN 10204, Metallic products — Types of inspection documents
ISO 710 (all parts), Graphical symbols for use on detailed maps, plans and geological cross-sections
ISO 14688-1, Geotechnical investigation and testing — Identification and classification of soil — Part 1:
Identification and description
ISO 22475-1, Geotechnical investigation and testing — Sampling methods and groundwater measurements
— Part 1: Technical principles for execution
ISO 22476-1, Geotechnical investigation and testing — Field testing — Part 1: Electrical cone and piezocone
penetration test
ISO 22476-2, Geotechnical investigation and testing — Field testing — Part 2: Dynamic probing
ISO 22476-3, Geotechnical investigation and testing — Field testing — Part 3: Standard penetration test
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http: //www .electropedia .org/
— ISO Online browsing platform: available at http: //www .iso .org/obp
© ISO 2019 – All rights reserved 1
---------------------- Page: 7 ----------------------
oSIST prEN ISO 22476-14:2019
ISO/DIS 22476-14:2019(E)
3.1
Probing
indirect subsoil exploration method in soils normally by driving a cone vertically while measuring the
penetration resistance to derive geotechnical parameters
3.2
Borehole dynamic probing
probing in the borehole, which is carried out by driving by impact from the borehole base over a defined
penetration depth; here the impact device is directly above the probe in the borehole
3.3
Number of blows
N
30
The number of blows required the probe to penetrate by 30 cm, in relation to the depth ranges of 15 cm
to 45 cm of the probe depth
3.4
Penetration resistance
Sum of tip resistance and negligible skin friction recorded by the number of blows N
30
3.5
Derived values
Values of a geotechnical parameter determined by theory, correlation or empirically
Note 1 to entry: The derived values are used as an initial basis for determining characteristic values according to
EN 1997-1:2010, 2.4.3.
4 Equipment
The device for the borehole dynamic probing is shown in Figure 1. The technical data are shown in
Table 1.
The device is lowered into the borehole with an encased impact device on the rope and the probe is
driven in from there without a rod.
2 © ISO 2019 – All rights reserved
---------------------- Page: 8 ----------------------
oSIST prEN ISO 22476-14:2019
ISO/DIS 22476-14:2019(E)
Key
1 Rope 8 Drain plug
2 Packing box 9 Borehole base
3 Lifting rod 10 Cone
4 Automatic releasing device 11 Borehole depth
5 Hammer 12 Test range
6 Hollow cylinder, water tight 13 Penetration under the weight of the device
7 Anvil l Probe length
Figure 1 — Device for borehole dynamic probing
© ISO 2019 – All rights reserved 3
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oSIST prEN ISO 22476-14:2019
ISO/DIS 22476-14:2019(E)
Table 1 — Technical data
Technical data Symbol Unit Value
2
Tip cross-section area A cm 20
c
a
Tip diameter d mm 50,5 ± 0,5
(Wear limit) (d ) (49)
min
a
Mass of hammer m kg 63,5 ± 0,5
a
Height of fall h m 0,76 ± 0,01
c
Diameter of the lifting rod D mm 45
h
c
External diameter of the cone d mm 120
b c
Mass of the drive-in device without additional weight m kg 91 ± 2
1
c
Cone length l m 0,9
Test depth from borehole base t m 0,45
a
Production tolerances.
b
These are the parts (hollow cylinder, anvil and probe) without the moving parts for lifting and releasing the hammer.
c
There is no need to indicate production tolerances here.
The hammer shall be located in a watertight hollow cylinder. In case of application depths of more than
20 m under water, additional weights shall be used between the cone and hollow cylinder (see Figure 2).
4 © ISO 2019 – All rights reserved
---------------------- Page: 10 ----------------------
oSIST prEN ISO 22476-14:2019
ISO/DIS 22476-14:2019(E)
Key
1 Hammer
2 Hollow cylinder
3 Anvil
4 Drain plug
5 Additional weight
6 Borehole base
7 Cone
8 Penetration under the weight of the device
Figure 2 — Location of the additional weight
The dimensions of the cone tip are given in Table 1 and Figure 3. The material shall correspond to a
steel quality S 235 JR minimum according to EN 10025-2.
© ISO 2019 – All rights reserved 5
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oSIST prEN ISO 22476-14:2019
ISO/DIS 22476-14:2019(E)
Key
d Tip diameter
l Tip length
s
Figure 3 — Cone dimensions
Table 2 — Symbols and abbreviations
Symbol Name Unit
N number of blows between 15 cm to 45 cm -
30
N number of blows between 0 cm to 15 cm -
0-15
N number of blows between 15 cm to 30 cm -
15-30
N number of blows between 30 cm to 45 cm -
30-45
N number of blows between 15 cm to 45 cm above ground water level -
30,a
N number of blows between 15 cm to 45 cm underground water level -
30,u
σ‘ effective vertical stress in the depth z below the foundation base MPa
vz
5 Test procedure
5.1 General
The initial depths for the borehole dynamic probing in a borehole shall be specified.
The probing device defined in this standard may be used to explore the subsoil — depending on its
state and the boring device used — down to depths of ≈ 60 m.
Deviations from this standard and their effects on the result shall be substantiated and reported.
5.2 Test preparation
The borehole dynamic probing is performed from the borehole base. ISO 22475-1 applies to the boring
procedure. The borehole diameter shall not be more than 250 mm. If casing is used, this shall not extend
below the borehole base. The test area shall be undisturbed.
The borehole base shall be cleaned to the lower edge of the casing in order to prevent the effects of
boring sludge or caving in. When cleaning the borehole base negative pressure effects must be avoided
by slow withdrawal of the drilling equipment.
6 © ISO 2019 – All rights reserved
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oSIST prEN ISO 22476-14:2019
ISO/DIS 22476-14:2019(E)
The water level in the borehole shall be kept above the ground water l
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