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26/30492196 DC BS NA TO BS EN 1997-1. Geotechnical design - General rules, 2026
- 30492196_Form 36
- 30492196 [Go to Page]
- Publishing information
- Supersession
- Where websites and webpages have been cited, they are provided for ease of reference and are correct at the time of publication. The location of a webpage or website, or its contents, cannot be guaranteed.
- Presentational conventions
- NA.1 Scope
- NA.2 Nationally determined parameters [Go to Page]
- NA.2.1 4.1.2.2(1) General features to consider when selecting the Geotechnical Complexity Class
- NA.2.2 4.1.2.3(3) The relationship between Geotechnical Category, Consequences Class and Geotechnical Complexity Class
- NA.2.3 4.1.3(1) Examples of geotechnical structures in Consequence Classes CC0 to CC4
- NA.2.4 4.1.4(2) Design measures to enhance robustness of geotechnical structures
- NA.2.5 4.1.5(1) The value of Tlf different categories of geotechnical structures
- NA.2.6 4.1.8(3) The relationship between Geotechnical Category (GC) and DQL, DCL and IL
- NA.2.7 4.2.3.2(2) Measures to validate the Geotechnical Design Model (GDM)
- NA.2.8 4.2.4(3) Measures to validate the information in the Ground Investigation Report (GIR)
- NA.2.9 4.3.2.3(2) Indicative values
- NA.2.10 4.4.1.3(1) Values of the partial factor (M for persistent, transient and accidental design situations and values of kM for different consequence classes
- NA.2.11 4.4.1.3(9) Constraints on the use of ktr < 1,0
- NA.2.12 4.4.1.3(9) The value of the reduction factor ktr
- NA.2.13 4.4.1.5(1) The value of R for an accidental design situation and values of the consequence factor kR
- NA.2.14 4.5(1) Prescriptive rules for verification of limit states
- NA.2.15 4.5(4) Prescriptive rules for geotechnical structures
- NA.2.16 5.4(2) Relevant standards giving additional rules for grout for rock bolts
- NA.2.17 5.5(2) Relevant standards giving additional rules for reinforcing elements
- NA.2.18 5.5(3) Relevant standards giving additional rules for prestressing steel
- NA.2.19 7.1.1(7) Minimum level of validation of calculation models
- NA.2.20 7.2(2) The value of the model factor
- NA.2.21 8.1.4.2(3) The values of (HYD and (pv
- NA.2.22 8.2(1) Verification of ultimate limit states by numerical models
- NA.2.23 10.2(3) NA.2.27 Further requirements in relation to safe working environments
- NA.2.24 12.1(4) The minimum extent and level of detail of reporting
- NA.2.25 A.4(3) Procedure for determination of the characteristic value of a ground property by statistical methods
- NA.2.26 A.4(8) Indicative values of the coefficients of variation for ground properties and for test parameters
- NA.2.27 A.4(11) Permission to use indicative values of coefficient of variation for ground properties or test parameters
- NA.2.28 C.3(3) Specific features to include in the evaluation of the Geotechnical Complexity Class
- NA.2.29 C.3(4) Specific features to be fulfilled for GCC1
- NA.3 Decisions on the status of informative annexes [Go to Page]
- NA.3.1 Annex A, Characteristic value determination procedure
- NA.3.2 Annex B, Contents of reports
- NA.3.3 Annex C, Guideline on selection of Geotechnical Complexity Class
- NA.4 Complementary information [Go to Page]
- NA.4.1 References to complementary information
- Annex NA.A (informative)
- Indicative values of selected ground properties
- NA.A.1 Use of this annex
- NA.A.2 Scope and field of application
- NA.A.3 Soils
- NA.A.3.1 General
- NA.A.3.2 Very coarse soils (cobbles and boulders)
- NA.A.3.3 Coarse soils (sands and gravels)
- NA.A.3.4 Fine soils (silts and clays)
- NA.A.3.5 Mixed soils
- NA.A.4 Rocks and rock masses
- NA.A.5 Fill
- NA.A.6 Earthworks [Go to Page]
