SIST EN 1997-1:2024/oprA1:2026
(Amendment)Eurocode 7 - Geotechnical design - Part 1: General rules
- Abstract
1.1 Scope of EN 1997 1
(1) This document provides general rules for the design and verification of geotechnical structures.
(2) This document is applicable for the design and verification of geotechnical structures outside the scope of EN 1997 3.
NOTE In this case, additional or amended provisions can be necessary.
1.2 Assumptions
(1) In addition to the assumptions given in EN 1990, the provisions of EN 1997 (all parts) assume that:
— ground investigations are planned by individuals or organisations with knowledge of potential ground and groundwater conditions;
— ground investigations are executed by individuals with appropriate skills and experience;
— the evaluation of test results and derivation of ground properties from the ground investigation are carried out by individuals with appropriate geotechnical experience and qualifications;
— the data required for design are collected, recorded, and interpreted by appropriately qualified and experienced individuals;
— geotechnical structures are designed and verified by individuals with appropriate qualifications and experience in geotechnical design;
— adequate continuity and communication exist between the individuals involved in data collection, design, verification and execution.
(2) This document is intended to be used in conjunction with EN 1990, which establishes principles and requirements for the safety, serviceability, robustness, and durability of structures, including geotechnical structures, and other construction works.
NOTE Additional or amended provisions can be necessary for assessment of existing structures, see EN 1990 2.
(3) This document is intended to be used in conjunction with EN 1997 2, which gives provisions for determining ground properties from ground investigations.
(4) This document is intended to be used in conjunction with EN 1997 3, which gives specific rules for the design and verification of certain types of geotechnical structures.
(5) This document is intended to be used in conjunction with other Eurocodes for the design of geotechnical structures, including temporary geotechnical structures.
- Status
- Not Published
- Public Enquiry End Date
- 29-Jul-2026
- Technical Committee
- KON - Structures
- Current Stage
- 4020 - Public enquire (PE) (Adopted Project)
- Start Date
- 17-Jun-2026
- Due Date
- 04-Nov-2026
SIST EN 1997-1:2024/oprA1:2026 is a Slovenian draft amendment to Eurocode 7 - Geotechnical design - Part 1: General rules, issued by SIST and prepared by CEN. It updates the general rules for the design and verification of geotechnical structures, for use by people involved in ground investigation, geotechnical design, verification, execution, and monitoring.
What does SIST EN 1997-1:2024/oprA1:2026 specify?
SIST EN 1997-1:2024/oprA1:2026 amends the general rules for geotechnical design in EN 1997-1:2024. The document applies to geotechnical structures outside the scope of EN 1997-3, and its use is tied to EN 1990, EN 1997-2, EN 1997-3, and other Eurocodes.
The amendment is organized as a set of modifications to the existing standard:
- whole-document updates
- the Introduction
- Clause 2 on normative references
- Clause 3 on terms and definitions
- Clause 4 on basis of design
- Clause 5 on material
- Clause 6 on ground water
- Clause 8 on ultimate limit state
- Clause 10 on implementation of design
- the Bibliography
What are the key requirements of SIST EN 1997-1:2024/oprA1:2026?
The amendment mainly aligns EN 1997-1 with newer companion standards and refines how geotechnical design conditions are read and applied. In practice, it affects which referenced Eurocodes you use, how you interpret key tables and figures, and how you carry design assumptions through execution.
Updated reference framework
Across the document, references are replaced with the current editions of EN 1990-1, EN 1997-2, and EN 1997-3. This matters because design and verification are meant to follow the latest linked Eurocode parts, not older placeholders.
Basis of design and national choices
Clause 4 updates the wording in Tables 4.1, 4.2, and 4.3 from “Lower/Higher” to “Low/High” and keeps these as NDP-related tables. For users, that means national choices still govern some design parameters, so the National Annex remains part of the design decision chain.
Clause 4.1.3 also gives examples of geotechnical structures whose integrity is vital for civil protection in natural disasters. That helps readers identify cases where consequence and reliability considerations are especially important.
Ground water and stability checks
Clause 6 revises Figure 6.1 so the key for X2 no longer includes “annual maximum”. Clause 8 strengthens the treatment of groundwater effects in ultimate limit state checks, including upward groundwater flow, water pressure with depth, and vertical effective pressure with depth.
In practice, this means groundwater conditions must be read carefully when checking stability, uplift, seepage, and excess pore water pressure.
Implementation and execution
Clause 10 tightens the wording on execution. Human error is to be minimized during implementation, and monitored changes in behaviour must be checked against construction activities. This links design directly to site control, inspection, and monitoring.
What terms does SIST EN 1997-1:2024/oprA1:2026 define?
- Geotechnical structures - the structures covered by EN 1997-1 for design and verification in ground-related conditions.
- Ground investigations - the planned, executed, and interpreted investigation work used to derive ground and groundwater properties.
- Basis of design - the design framework in Clause 4 that combines assumptions, parameters, and nationally determined choices.
- Nationally Determined Parameters (NDP) - values set at national level for items shown in the tables of Clause 4.
- Ultimate limit state (ULS) - the condition in Clause 8 where safety against failure and loss of stability is checked.
- Ground water - the groundwater conditions that influence design, pressure, and stability calculations.
- Implementation of design - the execution-stage requirements in Clause 10 that connect design intent with site practice.
Who uses SIST EN 1997-1:2024/oprA1:2026?
SIST EN 1997-1:2024/oprA1:2026 is used by geotechnical engineers, structural engineers, designers of foundations and underground works, and teams responsible for ground investigation and verification. It also matters to quality managers, contractors, and checking bodies because it links design assumptions to execution, monitoring, and documented national parameters.
What changed in SIST EN 1997-1:2024/oprA1:2026 from the previous edition?
SIST EN 1997-1:2024/oprA1:2026 amends EN 1997-1:2024 with:
- updated references to EN 1990-1:2023+A1:2026, EN 1997-2:2024+A1:2026, and EN 1997-3:2025+A1:2026
- an added reference to EN 19100 Eurocode 10 in the Introduction
- revised wording in Clause 3 and deletion of several symbols and definitions in 3.2.1
- table wording changes in Clause 4 and an updated example note for vital geotechnical structures
- a Figure 6.1 key change for groundwater interpretation
- Figure 8.1 and Figure 8.2 updates, including added groundwater-flow and pressure labels
- wording changes in Clause 10 on human error and monitored behaviour
- a bibliography update from prEN 1990-2 to EN 1990-2
Which standards are used with SIST EN 1997-1:2024/oprA1:2026?
- EN 1990-1:2023+A1:2026 - provides the basis of structural and geotechnical design used alongside EN 1997-1.
- EN 1997-2:2024+A1:2026 - provides the provisions for determining ground properties from ground investigations.
- EN 1997-3:2025+A1:2026 - provides specific rules for certain geotechnical structures.
- EN 1991-1-1:2025 - is cited in the normative references and in a material-related note.
- EN 19100 - named in the Introduction as Eurocode 10, showing the wider Eurocode family context.
What does the SIST EN 1997-1:2024/oprA1:2026 document contain?
The document contains a foreword, then clause-by-clause amendments to the existing standard. Its technical material centers on updated normative references, terms and definitions, basis of design tables, groundwater figures, ULS figures and formula wording, and execution-related text.
It includes Tables 4.1 to 4.3 for nationally determined parameters, Figure 6.1 for groundwater interpretation, and Figures 8.1 and 8.2 for ULS situations involving groundwater and effective pressure. Formula (8.1) is also corrected in Clause 8.
The amendment does not restate the whole standard; instead, it identifies the places where the existing text, symbols, notes, and figures are changed for design and verification work.
Relations
- Effective Date
- 19-Nov-2025
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Frequently Asked Questions
SIST EN 1997-1:2024/oprA1:2026 is a draft published by the Slovenian Institute for Standardization (SIST). Its full title is "Eurocode 7 - Geotechnical design - Part 1: General rules". This standard covers: 1.1 Scope of EN 1997 1 (1) This document provides general rules for the design and verification of geotechnical structures. (2) This document is applicable for the design and verification of geotechnical structures outside the scope of EN 1997 3. NOTE In this case, additional or amended provisions can be necessary. 1.2 Assumptions (1) In addition to the assumptions given in EN 1990, the provisions of EN 1997 (all parts) assume that: — ground investigations are planned by individuals or organisations with knowledge of potential ground and groundwater conditions; — ground investigations are executed by individuals with appropriate skills and experience; — the evaluation of test results and derivation of ground properties from the ground investigation are carried out by individuals with appropriate geotechnical experience and qualifications; — the data required for design are collected, recorded, and interpreted by appropriately qualified and experienced individuals; — geotechnical structures are designed and verified by individuals with appropriate qualifications and experience in geotechnical design; — adequate continuity and communication exist between the individuals involved in data collection, design, verification and execution. (2) This document is intended to be used in conjunction with EN 1990, which establishes principles and requirements for the safety, serviceability, robustness, and durability of structures, including geotechnical structures, and other construction works. NOTE Additional or amended provisions can be necessary for assessment of existing structures, see EN 1990 2. (3) This document is intended to be used in conjunction with EN 1997 2, which gives provisions for determining ground properties from ground investigations. (4) This document is intended to be used in conjunction with EN 1997 3, which gives specific rules for the design and verification of certain types of geotechnical structures. (5) This document is intended to be used in conjunction with other Eurocodes for the design of geotechnical structures, including temporary geotechnical structures.
1.1 Scope of EN 1997 1 (1) This document provides general rules for the design and verification of geotechnical structures. (2) This document is applicable for the design and verification of geotechnical structures outside the scope of EN 1997 3. NOTE In this case, additional or amended provisions can be necessary. 1.2 Assumptions (1) In addition to the assumptions given in EN 1990, the provisions of EN 1997 (all parts) assume that: — ground investigations are planned by individuals or organisations with knowledge of potential ground and groundwater conditions; — ground investigations are executed by individuals with appropriate skills and experience; — the evaluation of test results and derivation of ground properties from the ground investigation are carried out by individuals with appropriate geotechnical experience and qualifications; — the data required for design are collected, recorded, and interpreted by appropriately qualified and experienced individuals; — geotechnical structures are designed and verified by individuals with appropriate qualifications and experience in geotechnical design; — adequate continuity and communication exist between the individuals involved in data collection, design, verification and execution. (2) This document is intended to be used in conjunction with EN 1990, which establishes principles and requirements for the safety, serviceability, robustness, and durability of structures, including geotechnical structures, and other construction works. NOTE Additional or amended provisions can be necessary for assessment of existing structures, see EN 1990 2. (3) This document is intended to be used in conjunction with EN 1997 2, which gives provisions for determining ground properties from ground investigations. (4) This document is intended to be used in conjunction with EN 1997 3, which gives specific rules for the design and verification of certain types of geotechnical structures. (5) This document is intended to be used in conjunction with other Eurocodes for the design of geotechnical structures, including temporary geotechnical structures.
SIST EN 1997-1:2024/oprA1:2026 is classified under the following ICS (International Classification for Standards) categories: 91.010.30 - Technical aspects; 93.020 - Earthworks. Excavations. Foundation construction. Underground works. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 1997-1:2024/oprA1:2026 has the following relationships with other standards: It is inter standard links to kSIST FprEN 1997-1:2024. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 1997-1:2024/oprA1:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2026
Evrokod 7 - Geotehnično projektiranje - 1. del: Splošna pravila
Eurocode 7 - Geotechnical design - Part 1: General rules
Eurocode 7 - Entwurf, Berechnung und Bemessung in der Geotechnik - Teil 1:
Allgemeine Regeln
Eurocode 7 - Calcul géotechnique - Partie 1 : Règles générales
Ta slovenski standard je istoveten z: EN 1997-1:2024/prA1
ICS:
91.010.30 Tehnični vidiki Technical aspects
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.
DRAFT
EUROPEAN STANDARD
EN 1997-1:2024
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
June 2026
ICS 93.020
English Version
Eurocode 7 - Geotechnical design - Part 1: General rules
Eurocode 7 - Calcul géotechnique - Partie 1 : Règles Eurocode 7 - Entwurf, Berechnung und Bemessung in
générales der Geotechnik - Teil 1: Allgemeine Regeln
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 250.
This draft amendment A1, if approved, will modify the European Standard EN 1997-1:2024. If this draft becomes an amendment,
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of
this amendment into the relevant national standard without any alteration.
This draft amendment 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 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, Türkiye and
United Kingdom.
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.
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
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1997-1:2024/prA1:2026 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
1 Modifications throughout the whole document . 4
2 Modifications to the Introduction . 4
3 Modifications to Clause 2, “Normative references” . 4
4 Modifications to Clause 3, “Terms and definitions” . 4
5 Modifications to Clause 4, “Basis of design” . 4
6 Modification to Clause 5, “Material” . 5
7 Modifications to Clause 6, “Ground water” . 5
8 Modifications to Clause 8, “Ultimate limit state” . 5
9 Modifications to Clause 10, “Implementation of design” . 7
10 Modification to the Bibliography . 7
European foreword
This document (EN 1997-1:2024/prA1:2026) has been prepared by Technical Committee CEN/TC 250
“Structural Eurocodes”, the secretariat of which is held by BSI. CEN/TC 250 is responsible for all
Structural Eurocodes and has been assigned responsibility for structural and geotechnical design matters
by CEN.
This document is currently submitted to the CEN Enquiry.
This document will amend EN 1997-1:2024.
NOTE Some modifications are purely editorial corrections to improve
...