Eurocode 7 - geotechnical design

Eurocode 7 - geotechnical design

ETC10 Questionnaire 2.5


	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 Ultimate limit state Q4. Which calculation model did you use to determine the maximum height of the embankment? Annex D from EN 1997-1 Alternative given in a national annex (specify) Alternative given in a national standard (specify) Terzaghi Meyerhof Brinch-Hansen Limiting equilibrium (slip circle/method of slices) Limiting equilibrium (wedge mechanism) Finite element analysis Finite difference analysis Other (specify) Q5. If you used a slip circle method, which variant of this method did you use? Bishop with horizontal interslice forces Bishop with variably inclined interslice forces Spencer/Bishop with constantly inclined interslice forces Janbu with horizontal interslice forces Janbu with variably inclined interslice forces Janbu with constantly inclined interslice forces Swedish circle method Morgenstern and Price Other (specify) Q6. Which parameters did you use for the ULS design of the embankment? Measured vane strength c_fv Corrected vane strength c_u Other (specify) Q7. 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 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 the location of boreholes/vane profiles relative to the embankment? Did not consider borehole/profile location Considered nearest borehole/profile only Considered 'average' of all boreholes/profiles Considered trend of all boreholes/profiles, biased towards nearest Other (specify) Q10. Please explain the reasons for your answer to Q9 Q11. 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) Q12. Please explain the reasons for your answer to Q11 Q13. 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 3 m, c_u,k (kPa) = At 4 m, c_u,k (kPa) = At 5 m, c_u,k (kPa) = At 6 m, c_u,k (kPa) = Q14. 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) Q15. Which country's National Annex did you use to interpret EN 1997-1? Q16. 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) Q17. 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 Q17a. 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 Q18. What is the embankment's maximum height to avoid an ultimate limit state? H (in m) = Concluding questions Q19. What other assumptions did you need to make to complete your design? Q20. Please specify any other data that you would have liked to have had to design this type of foundation Q21. How conservative do you consider your previous national practice to be for this design example? Very conservative Conservative About right Unconservative Very unconservative Q22. How conservative do you consider Eurocode 7 (with your National Annex) to be for this example? Very conservative Conservative About right Unconservative Very unconservative Q23. 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 Q24. Please provide any other relevant information needed to understand your solution to this design exercise

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