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26/30495277 DC National Annex to BS EN 1997-3. Eurocode 7. Geotechnical design - Geotechnical structures, 2026
- National Annex to BS EN 1997-3:2024, Eurocode 7 – Geotechnical design – Part 3: Geotechnical structures
- NA.1 Scope
- NA.2 Nationally determined parameters [Go to Page]
- NA.2.1 4.2.7.2(1) The minimum depth of field investigation
- NA.2.2 4.3.4(1) Relevant national standards for other materials
- NA.2.3 4.6.3(1) Partial factors for the verification of slopes, cuttings, and embankments at the ultimate limit state
- NA.2.4 5.2.7.2(1) Minimum extent of field investigation
- NA.2.5 5.3.3(1) Relevant standard for other materials
- NA.2.6 5.6.1(5) Presumed bearing resistance
- NA.2.7 5.6.3(5) Limit values of design eccentricities in ULS verifications
- NA.2.8 5.6.3(7) Values of design width and diameter of spread foundations
- NA.2.9 5.6.6(1) Partial factors for spread foundations
- NA.2.10 5.6.6(3) Value of kR,tr
- NA.2.11 5.7.5(1) Limits to load eccentricity at the serviceability limit state
- NA.2.12 6.1(2) Classification of piles
- NA.2.13 6.2.7.2(1) Minimum extent of field investigation for piled foundations [Go to Page]
- NA.2.14 6.3.7(1) Relevant standards for other materials
- NA.2.15 6.5.3.1(2) Method to determine the axial resistance of a single pile by calculation
- NA.2.16 6.5.3.3(5) Method for applying signal matching
- NA.2.17 6.5.3.3(8) Use of dynamic impact or rapid load test results in saturated fine soils
- NA.2.18 6.5.3.3(10) Calibration procedures for wave equation analysis
- NA.2.19 6.5.3.3(11) Calibration procedures for pile driving formulae
- NA.2.20 6.5.6(3) Constraints on determining the ultimate compressive resistance of a piled raft by neglecting pile resistances
- NA.2.21 6.5.6(4) Constraints on the use of formula (6.8)
- NA.2.22 6.5.8(4) Number and type of site-specific pile load tests to confirm pile design by calculation
- NA.2.23 6.6.2.1(2) Model factor for verification of axial pile resistance
- NA.2.24 6.6.2.4.2(1) Correlation factors for the Model Pile Method
- NA.2.25 6.6.2.4.3(1) Correlation factors for the design by testing
- NA.2.26 6.6.3(4) Model factor (Rd,group for pile groups
- NA.2.27 6.6.3(5) Model factor (Rd,piled-raft for piled rafts
- NA.2.28 6.6.4.1(1) Partial factors for single piles
- NA.2.29 6.6.4.2(1) Partial factors for pile groups and piled rafts
- NA.2.30 6.7(4) Omission of explicit verification of settlement
- NA.2.31 6.9.3(6) The value of (test in the calculation of Rrep,SLS
- NA.2.32 7.2.7.2(1) Minimum extent of field investigation for retaining structures
- NA.2.33 7.3.7(1) Relevant national standards for other materials
- NA.2.34 7.4.1(1) Guidance on water pressures acting up to ground surface
- NA.2.35 7.5.3.2(2) Value of p(a,min
- NA.2.36 7.5.3.2(5) Value of pa,min
- NA.2.37 7.6.2(6) Value of additional model factor, (Rd,retain
- NA.2.38 7.6.7(2) Value of the model factor, (Sd for effect of actions in supporting elements
- NA.2.39 7.6.9(1) Partial factors for retaining structures
- NA.2.40 8.2.7.2(1) Minimum extent of field investigation for anchors
- NA.2.41 8.3.4(1) Relevant national standards for other materials
- NA.2.42 8.6.2(1) Verification of anchors by investigation and suitability tests
- NA.2.43 8.6.2(7) Values of the creep rate defining an anchor's geotechnical resistance
- NA.2.44 8.6.2(8) Ultimate limit state criterion for non-grouted anchors
- NA.2.45 8.6.2(9) Value of the correlation factor accounting for the number of anchor tests
- NA.2.46 8.6.4(1) Partial factors for ultimate limit state verification of anchors
- NA.2.58 10.3.2.2(2) Corrosion protection measures
- NA.2.59 10.3.7.1(11) Values of (dmg and (cor for steel wire mesh
- NA.2.60 10.3.9(1) Relevant national standards for other materials [Go to Page]
- NA.2.61 10.6.2(2) Value of the model factor (Rd,nail for use in the Material Factor Approach
- NA.2.62 10.6.2(3) Value of the model factor (Rd,nail for use in the Resistance Factor Approach
- NA.2.63 10.6.2(6) Values of correlation factors for verification of soil nails by calculation
- NA.2.64 10.6.2(7) Values of correlation factors for verification of soil nails by testing
- NA.2.65 10.6.5(3) Value of the model factor (Rd,wm
- NA.2.66 10.6.7(1) Partial factors for soil nailed structures
- NA.2.67 10.9.1(4) Minimum number of investigation, suitability and acceptance tests for soil nails
- NA.2.68 10.9.2(1) Specification of investigation, suitability, and acceptance tests for soil nails
- NA.2.69 10.9.2(8) Values of the partial factor (test and correlation factor ( for suitability tests on soil nails [Go to Page]
- NA.2.70 10.9.2(10) Values of the partial factor (test and correlation factor ( for acceptance tests on soil nails
- NA.2.71 11.3.3.2(3) Corrosion protection measures for rock bolts made of steel
- NA.2.72 11.3.3.2(8) Value of limiting yield strength fy,bolt
- NA.2.73 11.3.5(1) Relevant national standards for other materials
- NA.2.74 11.6.2(1) Value of the model factor (Rd,bolt for rock bolts
- NA.2.75 11.6.3(1) Values of the correlation factors for rock bolts
- NA.2.76 11.6.5(1) Partial factors for rock bolts
- NA.2.77 11.9.1(4) Minimum number of investigation, suitability, acceptance, and control tests for rock bolts
- NA.2.78 11.9.2(1) Specification of investigation, suitability, and acceptance tests for rock bolts soil nails
- NA.2.79 11.9.2(4) Values of the partial factor (test and correlation factor ( for suitability tests on rock bolts
- NA.2.80 11.9.2(5) Values of the partial factor (test and correlation factor ( for acceptance tests on rock bolts
- NA.2.81 11.9.3(1) Control tests for rock bolts and rock surface support
- NA.2.82 12.2.2(2) Acceptable deviations of the geometrical properties
- NA.2.83 12.2.7.2(1) Minimum extent of field investigation for ground improvement
- NA.2.84 12.5.3(5) Values of Bref, cu,ref and href
- NA.2.85 12.5.4(2) Number of samples N and conversion factor (c
- NA.2.86 12.5.4(5) Value P of the fractile of the dataset
- NA.2.87 12.5.4(6) Values of the reduction factor k and maximum unconfined compressive strength qu,max
- NA.1 12.6.1(2) Methods used to verify ultimate limit states of ground improvement [Go to Page]
- NA.2.88 12.6.3(1) Value of the model factor (Rd,sys for Class BI ground improvement
- NA.2.89 12.6.6(1) Partial factors for ground improvement
- NA.2.90 12.9.2.1(1) Minimum frequencies and type of material control tests
- NA.2.91 12.9.2.2(2) Value of the scale factor kUCS
- NA.2.92 13.2.7.2(1) Minimum extent of field investigation for groundwater control measures
- NA.2.93 13.3(4) Relevant national standards for other materials
- NA.2.94 13.8.3(1) Measures to check the groundwater conditions
- NA.3 Decisions on the status of informative annexes [Go to Page]
- NA.3.1 Annex A, Slopes, cuttings, and embankments
- NA.3.2 Annex B, Spread foundations
- NA.3.3 Annex C, Piled foundations
- NA.3.4 Annex D, Retaining structures
- NA.3.5 Annex E, Anchors [Go to Page]
- NA.3.6 Annex F, Reinforced fill structures
- NA.3.7 Annex G, Soil nailed structures
- NA.3.8 Annex H, Rock bolts and rock surface support
- NA.3.9 Annex I, Ground improvement
- NA.3.10 Annex J, Groundwater control measures
- NA.3.11 Annex K, Themoactive geostructures design
- NA.4 Complementary information
- NA.2 References to complementary information [Go to Page]
