oSIST prEN ISO 19901-4:2022
(Main)Petroleum and natural gas industries - Specific requirements for offshore structures - Part 4: Geotechnical design considerations (ISO/DIS 19901-4:2022)
Petroleum and natural gas industries - Specific requirements for offshore structures - Part 4: Geotechnical design considerations (ISO/DIS 19901-4:2022)
Erdöl- und Erdgasindustrie - Besondere Anforderungen an Offshore-Bauwerke - Teil 4: Geotechnische und Fundament-Auslegungsmerkmale (ISO/DIS 19901-4:2022)
Industries du pétrole et du gaz naturel - Exigences spécifiques relatives aux structures en mer - Partie 4: Bases conceptuelles géotechniques (ISO/DIS 19901-4:2022)
Industrija za predelavo nafte in zemeljskega plina - Posebne zahteve za naftne ploščadi - 4. del: Obravnava geotehničnih značilnosti projektiranja (ISO/DIS 19901-4:2022)
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Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN ISO 19901-4:2022
01-julij-2022
Industrija za predelavo nafte in zemeljskega plina - Posebne zahteve za naftne
ploščadi - 4. del: Obravnava geotehničnih značilnosti projektiranja (ISO/DIS 19901-
4:2022)
Petroleum and natural gas industries - Specific requirements for offshore structures -
Part 4: Geotechnical design considerations (ISO/DIS 19901-4:2022)
Erdöl- und Erdgasindustrie - Besondere Anforderungen an Offshore-Bauwerke - Teil 4:
Geotechnische und Fundament-Auslegungsmerkmale (ISO/DIS 19901-4:2022)
Industries du pétrole et du gaz naturel - Exigences spécifiques relatives aux structures
en mer - Partie 4: Bases conceptuelles géotechniques (ISO/DIS 19901-4:2022)
Ta slovenski standard je istoveten z: prEN ISO 19901-4
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
oSIST prEN ISO 19901-4:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN ISO 19901-4:2022
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oSIST prEN ISO 19901-4:2022
DRAFT INTERNATIONAL STANDARD
ISO/DIS 19901-4
ISO/TC 67/SC 7 Secretariat: BSI
Voting begins on: Voting terminates on:
2022-05-19 2022-08-11
Petroleum and natural gas industries — Specific
requirements for offshore structures —
Part 4:
Geotechnical design considerations
ICS: 75.180.10
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
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STANDARD UNTIL PUBLISHED AS SUCH.
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Reference number
NATIONAL REGULATIONS.
ISO/DIS 19901-4:2022(E)
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TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
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PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022
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oSIST prEN ISO 19901-4:2022
ISO/DIS 19901-4:2022(E)
ISO/DIS 19901-4:2022(E)
ISO/TC 67/SC 7/WG 10
Date: 2021-11-DD
Petroleum and natural gas industries — Specific requirements for
offshore structures — Part 4: Geotechnical design considerations
DIS stage
IOGP Conditions and Disclaimer
This draft document has been prepared as part of IOGP’s standards development activity and is
transferred to the ISO/TC 67 Secretariat for the sole purpose of balloting and/or publication and on the
condition that no other circulation is permitted prior to such ISO balloting and/or publication
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Whilst every effort has been made to ensure the accuracy of the information contained in this draft
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regardless of its or their negligence, assume liability for any foreseeable or unforeseeable use made
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ii
© ISO 2022 – All rights reserved
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oSIST prEN ISO 19901-4:2022
ISO/DIS 19901-4:2022(E)
Contents
Foreword . xvi
Introduction . xvii
1 Scope . 1
2 Normative references . 3
3 Terms and definitions . 3
4 Symbols and abbreviated terms . 6
4.1 General . 6
4.2 Symbols for shallow and intermediate foundation design . 6
4.3 Symbols for pile foundation design . 8
4.4 Symbols for soil-structure interaction for auxiliary subsea structures, risers and
flowlines . 11
4.5 Symbols for design of anchors for stationkeeping systems . 11
4.6 Abbreviated terms . 13
5 General requirements . 13
5.1 General . 13
5.2 Design cases and safety factors . 14
5.3 Representative and design values of soil parameters . 15
5.3.1 Generic principles . 15
5.3.2 Determination of representative and design values of soil parameters . 15
5.3.3 Geotechnical reliability-based design . 17
5.4 Testing and instrumentation . 17
6 Geotechnical data acquisition and identification of hazards . 18
6.1 General . 18
6.2 Geological modelling and identification of hazards . 18
6.2.1 General . 18
6.2.2 Assessment of site geohazards . 18
6.3 Carbonate soils . 19
6.3.1 General . 19
6.3.2 Characteristic features and properties of carbonate soils . 19
6.3.3 Foundations in carbonate soils . 19
7 Design of shallow and intermediate foundations . 20
7.1 General . 20
7.2 Principles . 22
7.2.1 General principles . 22
7.2.2 Foundation embedment . 22
7.2.3 Sign conventions, nomenclature and action reference point . 24
7.3 Acceptance criteria . 24
7.3.1 Material and action factors . 24
7.3.2 Use of partial factors in design . 25
7.3.3 Special cases . 25
7.4 Design considerations . 25
7.4.1 Adjusting for soil plug weight . 25
7.4.2 Skirt spacing . 26
7.4.3 Foundation base perforations . 26
7.4.4 Skirtless foundations penetrating into soft soils . 26
7.4.5 Tensile stresses beneath foundations . 27
7.4.6 Omni-directional actions . 27
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oSIST prEN ISO 19901-4:2022
ISO/DIS 19901-4:2022(E)
7.4.7 Interaction with other structures .27
7.4.8 Multiple foundations .27
7.4.9 Hydraulic stability .27
7.4.10 Unconventional soils or soil profiles.28
7.4.11 Selection of soil parameter values for design .28
7.5 Ultimate limit state (stability) .29
7.5.1 Assessment of bearing capacity of shallow foundations .29
7.5.2 Assessment of sliding capacity of shallow foundations .31
7.5.3 Assessment of capacity of intermediate foundations .34
7.6 Serviceability limit state (displacements and rotations) .34
7.6.1 General .34
7.6.2 Serviceability of shallow foundations under static loading .34
7.6.3 Serviceability of intermediate foundations .36
7.6.4 Serviceability in response to dynamic and cyclic actions .36
7.7 Alternative methods of design .37
7.7.1 Yield surface approach .37
7.7.2 Performance-based design approach .37
7.8 Installation .37
7.8.1 General .37
7.8.2 Skirt penetration resistance .38
7.8.3 Required and allowable under-pressure .38
7.9 Relocation, retrieval and removal .39
8 Pile foundation design .39
8.1 Pile capacity for axial compression .39
8.1.1 General .39
8.1.2 Axial pile capacity .40
8.1.3 Skin friction and end bearing in clay soils .41
8.1.4 Skin friction and end bearing in sands .43
8.1.5 Skin friction and end bearing in gravels .44
8.1.6 Skin friction and end bearing of grouted piles in rock .45
8.1.7 Skin friction and end bearing of driven piles in intermediate soils .45
8.2 Pile capacity for axial tension .45
8.3 Axial pile performance .45
8.3.1 Static axial behaviour of piles .45
8.3.2 Cyclic axial behaviour of piles .46
8.4 Soil reaction for piles under axial actions .46
8.4.1 Axial shear transfer t–z curves .46
8.4.2 End bearing resistance–displacement, Q–z, curve .47
8.5 Soil reaction for piles under lateral actions .48
8.5.1 General .48
8.5.2 Lateral soil reaction for clay .49
8.5.3 Lateral capacity for sand .55
8.5.4 Lateral soil resistance – displacement p–y curves for sand .56
8.5.5 P–y curves for fatigue actions .57
8.5.6 Refined assessment of lateral pile response .57
8.5.7 Lateral soil resistance-displacement curves in calcareous soil, cemented soil and
weak rock .57
8.6 Pile group behaviour .58
8.6.1 General .58
8.6.2 Axial behaviour .58
8.6.3 Lateral behaviour .58
8.7 Pile installation assessment .58
8.7.1 General .58
8.7.2 Drivability studies .59
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oSIST prEN ISO 19901-4:2022
ISO/DIS 19901-4:2022(E)
8.7.3 Obtaining required pile penetration . 60
8.7.4 Driven pile refusal . 60
8.7.5 Pile refusal remedial measures . 60
8.7.6 Selection of pile hammer and stresses during driving. 61
8.7.7 Use of hydraulic hammers . 62
8.7.8 Drilled and grouted piles . 62
8.7.9 Belled piles . 63
8.7.10 Grouting pile-to-sleeve connections . 63
8.7.11 Pile installation data. 63
8.7.12 Installation of conductors and shallow well drilling . 63
9 Reassessment of pile capacity for existing structures. 64
9.1 General . 64
9.2 Geotechnical and foundation data . 64
9.2.1 Geotechnical data . 64
9.2.2 Design data . 65
9.2.3 Installation data . 65
9.2.4 Condition data . 65
9.2.5 Operational data . 65
9.3 Evaluation . 65
9.4 Assessment . 66
9.4.1 General . 66
9.4.2 Pushover response of pile foundation systems . 66
9.5 Time-dependent effects on pile foundations . 67
10 Soil-structure interaction for subsea structures, risers and flowlines . 67
10.1 General . 67
10.2 Geotechnical investigation . 67
10.3 Foundations for subsea production structures . 68
10.4 Steel catenary risers . 68
10.4.1 General . 68
10.4.2 Design for ultimate limit state . 69
10.4.3 Design for fatigue state . 69
10.5 Geotechnical design for top tension risers . 71
10.5.1 General . 71
10.5.2 Jetted conductors . 71
10.5.3 Soil-structure interaction for well integrity assessment . 73
10.5.4 Geotechnical input to well strength assessment . 73
10.5.5 Geotechnical input to well fatigue assessment . 73
10.5.6 Geotechnical considerations in conductor driving analysis . 77
10.5.7 Geohazards for well installations . 78
10.6 Foundation design for riser towers . 78
10.6.1 General . 78
10.6.2 Foundation options . 78
10.6.3 Loading actions and safety factors . 78
10.6.4 Design challenges . 79
10.7 Pipelines and flowlines. 79
10.7.1 Geotechnical pipe-soil interaction (PSI) analysis . 79
10.7.2 Submarine slides and density flows: simulation and pipeline impact analysis . 80
11 Design of anchors for floating structures . 81
A.1 Scope . 82
A.2 Normative references . 82
A.3 Terms and definitions . 82
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oSIST prEN ISO 19901-4:2022
ISO/DIS 19901-4:2022(E)
A.4 Symbols and abbreviated terms .82
A.5 General requirements .82
A.5.1 General .82
A.5.2 Design cases and safety factors .82
A.5.3 Representative and design values of soil parameters .82
A.5.3.1 Generic principles .82
A.5.3.2 Determination of representative and design values of soil parameters .83
A.5.3.3 Geotechnical reliability-based design .83
A.5.4 Testing and instrumentation .84
A.6 Geotechnical data acquisition and identification of hazards .84
A.6.1 General .84
A.6.2 Geological modelling and identification of hazards .84
A.6.3 Carbonate soils .84
A.6.3.1 General .84
A.6.3.2 Characteristic features and properties of carbonate soils .84
A.6.3.3 Foundations in carbonate soils .85
A.6.3.3.1 Driven piles and other deep foundation alternatives .85
A.6.3.3.2 Shallow foundations .86
A.6.3.3.3 Assessment .86
...
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