EN ISO 19901-4:2016

Petroleum and natural gas industries - Specific requirements for offshore structures - Part 4: Geotechnical and foundation design considerations (ISO 19901-4:2016)

ISO 19901-4:2016 contains provisions for those aspects of geoscience and foundation engineering that are applicable to a broad range of offshore structures, rather than to a particular structure type. Such aspects are:
-      site and soil characterization;
-      identification of hazards;
-      design and installation of shallow foundations supported by the seabed;
-      design and installation of pile foundations;
-      soil-structure interaction for auxiliary structures, e.g. subsea production systems, risers and flowlines (guidance given in A.10);
-      design of anchors for the stationkeeping systems of floating structures (guidance given in A.11).
Particular requirements for marine soil investigations are detailed in ISO 19901‑8.
Aspects of soil mechanics and foundation engineering that apply equally to offshore and onshore structures are not addressed. The user of this part of ISO 19901 is expected to be familiar with such aspects.
ISO 19901‑4 outlines methods developed primarily for the design of shallow foundations with an embedded length (L) to diameter (D) ratio L/D < 1 (Clause 7) and relatively long and flexible pile foundations with L/D > 10 (Clause 8). This part of ISO 19901 does not apply to intermediate foundations with 1 < L/D < 10. Such intermediate foundations, often known as 'caisson foundations', comprise either shallow foundations with skirts penetrating deeper into the seabed than the width of the foundation, or shorter, more rigid and larger diameter piles than those traditionally used for founding offshore structures. The design of such foundations can require specific analysis methods; it is important that any extrapolation from the design methods described in this part of ISO 19901 to intermediate foundations be treated with care and assessed by a geotechnical specialist.

Erdöl- und Erdgasindustrie - Besondere Anforderungen an Offshore-Bauwerke - Teil 4: Geotechnische und Fundament-Auslegungsmerkmale (ISO 19901-4:2016)

Industries du pétrole et du gaz naturel - Exigences spécifiques relatives aux structures en mer - Partie 4: Bases conceptuelles des fondations (ISO 19901-4:2016)

La présente partie de l'ISO 19901 contient les dispositions relatives aux aspects géotechniques et de dimensionnement des fondations qui s'appliquent à une vaste gamme de structures en mer, plutôt qu'à un type particulier de structure. Ces aspects sont les suivants:
—          caractérisation du site et des sols;
—          identification des risques;
—          dimensionnement et installation des fondations superficielles supportées par le sol marin;
—          dimensionnement et installation des fondations par pieux;
—          interaction sol-structure pour les structures auxiliaires, par exemple les systèmes de production immergés, les risers (tubes prolongateurs) et les conduites d'écoulement (des indications sont données en A.10);
—          dimensionnement des ancrages des systèmes de maintien en position des structures flottantes (des indications sont données en A.11).
Les exigences particulières relatives aux reconnaissances des sols en mer sont détaillées dans l'ISO 19901‑8.
Les aspects de mécanique des sols et de dimensionnement des fondations qui s'appliquent aussi bien aux structures en mer qu'aux structures terrestres ne sont pas couverts. L'utilisateur de la présente partie de l'ISO 19901 est considéré comme familier de ces aspects.
L'ISO 19901‑4 décrit les méthodes développées principalement pour le dimensionnement des fondations superficielles avec un rapport entre longueur enfouie (L) et diamètre (D) L/D < 1 (Article 7) et des fondations par pieux relativement longs et flexibles avec L/D > 10 (Article 8). La présente partie de l'ISO 19901 ne s'applique pas aux fondations intermédiaires avec 1 < L/D < 10. De telles fondations intermédiaires, souvent appelées «caissons de fondation», comprennent soit des fondations superficielles à jupes pénétrant dans le sol marin sur une profondeur supérieure à la largeur de la fondation, soit des pieux plus courts, plus rigides et de plus grand diamètre que ceux traditionnellement utilisés pour les fondations des structures en mer. Le dimensionnement de telles fondations peut nécessiter des méthodes d'analyse spécifiques; il est important que toute extrapolation des méthodes de dimensionnement décrites dans la présente partie de l'ISO 19901 à des fondations intermédiaires soit traitée avec précaution et évaluée par un spécialiste en géotechnique.

Industrija za predelavo nafte in zemeljskega plina - Posebne zahteve za naftne ploščadi - 4. del: Obravnava geotehničnih in temeljnih značilnosti projektiranja (ISO 19901-4:2016)

Ta del standarda ISO 19901 vsebuje določbe za vidike geoznanosti in temeljenja, ki se uporabljajo za široko paleto naftnih ploščadi, ne zgolj za določeno vrsto konstrukcije.
Takšni vidiki so:
– karakterizacija območja in tal;
– prepoznavanje nevarnosti;
– načrtovanje in postavitev plitkih temeljev s podporo morskega dna;
– načrtovanje in postavitev temeljev na kolih;
– interakcija tla-konstrukcija za pomožne konstrukcije, npr. podmorske proizvodne sisteme, dvižne vode in
cevi, položene na morsko dno (smernice so podane v točki A.10);
– načrtovanje sider za vzdrževalne sisteme plavajočih konstrukcij (smernice so podane v točki A.11).
Posebne zahteve za preiskave morskega dna so opisane v standardu ISO 19901-8.
Vidiki mehanike tal in temeljenja, ki se enakovredno uporabljajo za konstrukcije na morju in na kopnem,
niso obravnavane. Od uporabnika tega dela standarda ISO 19901 se pričakuje, da je seznanjen s takšnimi
vidiki.
Standard ISO 19901-4 opredeljuje metode, ki so bile razvite predvsem za načrtovanje plitkih temeljev z
razmerjem dolžine (L) in premera (D) L/D < 1 (točka 7) ter relativno dolgih in fleksibilnih temeljev
na kolih z razmerjem L/D > 10 (točka 8). Ta del standarda ISO 19901 se ne uporablja za vmesne temelje z razmerjem 1 < L/D < 10. Takšni vmesni temelji, ki se pogosto imenujejo »kesoni«, so sestavljeni iz plitkih temeljev, pri čemer krilo sega globlje v morsko dno, kot je širina temelja, ali krajših, bolj togih kolov z večjim premerom, kot so tisti, ki se običajno uporabljajo za temeljenje naftnih ploščadi. Načrtovanje takšnih temeljev lahko zahteva posebne metode analize; pomembno je, da je vsaka ekstrapolacija iz metod načrtovanja, ki so opisane v tem delu standarda ISO 19901, v vmesne temelje pozorno obravnavana in ocenjena s strani strokovnjaka na področju geotehnologije.

General Information

• Status: Published
• Publication Date: 09-Aug-2016
• Withdrawal Date: 27-Feb-2017
• ICS: 13.080.99 - Other standards related to soil quality
• ICS: 75.180.10 - Exploratory, drilling and extraction equipment
• Technical Committee: CEN/TC 12 - Materials, equipment and offshore structures for petroleum and natural gas industries
• Drafting Committee: CEN/TC 12 - Materials, equipment and offshore structures for petroleum and natural gas industries
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 10-Aug-2016
• Completion Date: 10-Aug-2016
• Ref Project: SIST EN ISO 19901-4:2016 - Petroleum and natural gas industries - Specific requirements for offshore structures - Part 4: Geotechnical and foundation design considerations (ISO 19901-4:2016)

Relations

• Replaces: EN ISO 19901-4:2003 - Petroleum and natural gas industries - Specific requirements for offshore structures - Part 4: Geotechnical and foundation design considerations (ISO 19901-4:2003)
• Effective Date: 08-Jun-2022
• Revised: prEN ISO 19901-4 - Petroleum and natural gas industries - Specific requirements for offshore structures - Part 4: Geotechnical design considerations (ISO/DIS 19901-4:2022)
• Effective Date: 15-Dec-2021

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2016
1DGRPHãþD
SIST EN ISO 19901-4:2004
,QGXVWULMD]DSUHGHODYRQDIWHLQ]HPHOMVNHJDSOLQD3RVHEQH]DKWHYH]DQDIWQH
SORãþDGLGHO2EUDYQDYDJHRWHKQLþQLKLQWHPHOMQLK]QDþLOQRVWLSURMHNWLUDQMD
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Petroleum and natural gas industries - Specific requirements for offshore structures -
Part 4: Geotechnical and foundation design considerations (ISO 19901-4:2016)
Erdöl- und Erdgasindustrie - Besondere Anforderungen an Offshore-Bauwerke - Teil 4:
Geotechnische und Fundament-Auslegungsmerkmale (ISO 19901-4:2016)
Industries du pétrole et du gaz naturel - Exigences spécifiques relatives aux structures
en mer - Partie 4: Bases conceptuelles des fondations (ISO 19901-4:2016)
Ta slovenski standard je istoveten z: EN ISO 19901-4:2016
ICS:
75.180.10 Oprema za raziskovanje, Exploratory, drilling and
vrtanje in odkopavanje extraction equipment
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 19901-4
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2016
EUROPÄISCHE NORM
ICS 75.180.10 Supersedes EN ISO 19901-4:2003
English Version
Petroleum and natural gas industries - Specific
requirements for offshore structures - Part 4: Geotechnical
and foundation design considerations (ISO 19901-4:2016)
Industries du pétrole et du gaz naturel - Exigences Erdöl- und Erdgasindustrie - Besondere
spécifiques relatives aux structures en mer - Partie 4: Anforderungen an Offshore-Bauwerke - Teil 4:
Bases conceptuelles des fondations (ISO 19901- Geotechnische und Fundament-Auslegungsmerkmale
4:2016) (ISO 19901-4:2016)
This European Standard was approved by CEN on 2 July 2016.

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

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19901-4:2016 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 19901-4:2016) has been prepared by Technical Committee ISO/TC 67
"Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries"
in collaboration with Technical Committee CEN/TC 12 “Materials, equipment and offshore structures
for petroleum, petrochemical and natural gas industries” the secretariat of which is held by NEN
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 February 2017, and conflicting national standards
shall be withdrawn at the latest by February 2017.
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.
This document supersedes EN ISO 19901-4:2003.
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, 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 the
United Kingdom.
Endorsement notice
The text of ISO 19901-4:2016 has been approved by CEN as EN ISO 19901-4:2016 without any
modification.
INTERNATIONAL ISO
STANDARD 19901-4
Second edition
2016-07-15
Petroleum and natural gas
industries — Specific requirements
for offshore structures —
Part 4:
Geotechnical and foundation design
considerations
Industries du pétrole et du gaz naturel — Exigences spécifiques
relatives aux structures en mer —
Partie 4: Bases conceptuelles des fondations
Reference number
ISO 19901-4:2016(E)
©
ISO 2016
ISO 19901-4:2016(E)
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
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ii © ISO 2016 – All rights reserved

ISO 19901-4:2016(E)
Contents Page
Foreword .v
Introduction .vii
1 Scope . 1
2 Normative references . 1
3  Terms and definitions . 2
4 Symbols and abbreviated terms . 4
4.1 General . 4
4.2 Symbols for shallow foundations design . 4
4.3 Symbols for pile foundations design . 7
4.4 Symbols for soil-structure interaction for auxiliary subsea structures, risers
and flowlines .10
4.5 Symbols for design of anchors for stationkeeping systems .11
4.6 Abbreviated terms .12
5  General requirements .13
5.1 General .13
5.2 Design cases and safety factors .14
5.3 Characteristic values of soil properties .14
5.4 Testing and instrumentation .15
6  Geotechnical data acquisition and identification of hazards .16
6.1 General .16
6.2 Shallow geophysical investigation .16
6.3 Geological modelling and identification of hazards .17
6.3.1 General.17
6.3.2 Earthquakes .17
6.3.3 Fault planes .17
6.3.4 Seafloor instability .17
6.3.5 Scour and sediment mobility .18
6.3.6 Shallow gas .18
6.3.7 Seabed subsidence .18
6.4 Carbonate soils .19
7 Design of shallow foundations .19
7.1 General .19
7.2 Principles .20
7.2.1 General principles .20
7.2.2 Sign conventions, nomenclature and action reference point .21
7.2.3 Action transfer .21
7.2.4 Idealization of foundation area and the effective area concept .21
7.3 Acceptance criteria and design considerations .22
7.3.1 Action and material factors .22
7.3.2 Use in design . . .22
7.3.3 Special cases .23
7.3.4 Additional design considerations .24
7.3.5 Alternative method of design based on yield surfaces .26
7.3.6 Selection of soil parameter values for design .27
7.4 Stability of shallow foundations .
...