Eurocode 7 - geotechnical design

Eurocode 7 - geotechnical design

ETC10 Questionnaire 2.2


	General Q1. Please provide your contact details in case we need to clarify your submission. (These details will be kept strictly confidential.) Name Affiliation Email address Q2. How many structures of this kind have you previously designed? None 1-2 3-6 More than 6 Q3. Having completed your design to Eurocode 7, how confident are you that the design is sound? Very unsure Unsure Confident Very confident Q4. How did you account for the location of boreholes relative to the foundation? Did not consider borehole location Considered nearest borehole only Considered 'average' of all boreholes Considered trend of all boreholes, biased towards nearest Other (specify) Q5. Please explain the reasons for your answer to Q4 Serviceability limit state Q6. Which parameters did you use for the SLS design of the spread foundation? Water content w Plasticity index I_P Liquidity index I_L SPT blow count N Corrected SPT blow count (N₁)₆₀ Undrained Young's modulus of elasticity E_u Drained Young's modulus of elasticity E' Poisson's ratio n Shear modulus of elasticity G Permeability k Other (specify) Q7. What correlations did you use to derive soil parameter values (if used) for the SLS verification? If more than one, please list others below. Description Author Title Pages Q7a. Any other correlations (please give same info as above) Q8. What assumptions did you make in choosing these correlations? Q9. How did you account for any variation in parameters with depth? Ignored variation with depth Assumed linear variation with depth Assumed bi-linear variation with depth Assumed stepped variation Other (specify) Q10. Please explain the reasons for your answer to Q9 Q11. What is the characteristic value of N at these depths? At 1 m, N_k = At 2 m, N_k = At 4 m, N_k = Q12. What is the characteristic value of E_u for a linear elastic calculation at these depths? At 1 m, E_u,k (MPa) = At 2 m, E_u,k (MPa) = At 4 m, E_u,k (MPa) = Q13. How did you assess these values? By eye By linear regression By statistical analysis From an existing standard (specify) From a published correlation (specify) Comparison with a previous design From the soil description, not using the data Other (specify) Q14. Which calculation model did you use to determine settlement? Annex F.1 from EN 1997-1 Annex F.2 from EN 1997-1 Annex F.3 from EN 1997-2 Alternative from national annex (specify) Alternative from national standard (specify) Finite element analysis Finite difference analysis Other (specify) Q15. What limiting values of settlement and tilt is appropriate for this foundation? Settlement C_d (in mm) = Tilt C_d (1 in x) = Q16. What width does the foundation need to avoid a serviceability limit state? B_SLS (in m) = Ultimate limit state Q17. Which parameters did you use for the ULS design of the spread foundation? Water content w Plasticity index I_P Liquidity index I_L SPT blow count N Corrected SPT blow count (N₁)₆₀ Undrained shear strength c_u Angle of shearing resistance f' Effective cohesion c' Angle of interface friction d Permeability k Other (specify) Q18. What correlations did you use to derive soil parameter values (if used) for the ULS verification? If more than one, please list others below. Description Author Title Pages Q18a. Any other correlations (please give same info as above) Q19. What assumptions did you make in choosing these correlations? Q20. What is the characteristic value of c_u at these depths? At 1 m, c_u,k (kPa) = At 2 m, c_u,k (kPa) = At 4 m, c_u,k (kPa) = Q21. Which calculation model did you use to determine bearing resistance? Annex D from EN 1997-1 Alternative given in a national annex (specify) Alternative given in a national standard (specify) Terzaghi Meyerhof Brinch-Hansen Finite element analysis Finite difference analysis Other (specify) Q22. Which country's National Annex did you use to interpret EN 1997-1? Q23. Which Design Approach did you use for verification of the Ultimate Limit State (ULS)? Design Approach 1 Combinations 1 and 2 Design Approach 1 Combination 1 only Design Approach 1 Combination 2 only Design Approach 2 Design Approach 2* Design Approach 3 Other (specify) Q24. What values of partial factors did you use for this ULS verification? g_G g_Q g_f g_c g_cu g_Rv g_Rh g_Rd Q24a. If you used a second combination of partial factors, what values did you use for this second combination? g_G g_Q g_f g_c g_cu g_Rv g_Rh g_Rd Q25. What width does the foundation need to avoid an ultimate limit state? B_ULS (in m) = Q26. What are the structural forces (at its centreline) that the foundation must be designed for according to Eurocode 2? Design bending moment, M_Ed (in kNm) = Design shear force, V_Ed (in kN) = Concluding questions Q27. What other assumptions did you need to make to complete your design? Q28. Please specify any other data that you would have liked to have had to design this type of foundation Q29. How conservative do you consider your previous national practice to be for this design example? Very conservative Conservative About right Unconservative Very unconservative Q30. How conservative do you consider Eurocode 7 (with your National Annex) to be for this example? Very conservative Conservative About right Unconservative Very unconservative Q31. How does your Eurocode 7 design compare with your previous national practice? Much more conservative More conservative About the same Less conservative Much less conservative Q32. Please provide any other relevant information needed to understand your solution to this design exercise

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