Eurocode 7 - geotechnical design

Eurocode 7 - geotechnical design

ETC10 Questionnaire 2.4/benchmark


	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 assessment of pressures to Eurocode 7, how confident are you that the assessment is sound? Very unsure Unsure Confident Very confident Q4-7. Not used. Serviceability limit state Q8. What is the design depth of the water table d_w,d(SLS) in the serviceability limit state for the three situations? Situation A, d_w,d(SLS) (m) = Situation B, d_w,d(SLS) (m) = Situation C, d_w,d(SLS) (m) = Q9. How did you choose the design water level for the SLS? Took average of measured water levels Took highest measured water level Took water level at ground surface Other (specify) Q10. Please explain the reasons for your answer to Q9 Q11. What is the design thrust on the wall due to water pressure P_w in the SLS? Situation A, P_w,d(SLS) (in kN/m) = Situation B, P_w,d(SLS) (in kN/m) = Situation C, P_w,d(SLS) (in kN/m) = Q12. What is the design thrust on the wall due to effective earth pressure P'_a in the SLS? Situation A, P'_a,d(SLS) (in kN/m) = Situation B, P'_a,d(SLS) (in kN/m) = Situation C, P'_a,d(SLS) (in kN/m) = Q13. How did you determine effective earth pressures on the wall for SLS? Took active pressures (K_a) Took at-rest pressures (K₀) Took average of active and at-rest pressures (K_a + K₀)/2 Calculated approximate compaction pressures Other (specify) Q14. Please explain the reasons for your answer to the previous question (plus any assumptions made) Ultimate limit state Q15. What is the design depth of the water table d_w for the three design situations in the ULS? Situation A, d_w,d(ULS) (m) = Situation B, d_w,d(ULS) (m) = Situation C, d_w,d(ULS) (m) = Q16. How did you choose the design water level for the ULS? Took average of measured water levels Took highest measured water level Took characteristic water level Took level higher than characteristic water level Took water level at ground surface Other (specify) Q17. Please explain the reasons for your answer to Q16 Q18. Which country's National Annex did you use to interpret EN 1997-1? Q19. 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) Q20. What values of partial factors did you use for this ULS verification? g_G g_Q g_f g_c g_Rd g_Rv Q20a. 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_Rd g_Rv Q21. What partial factor did you apply to the action arising from characteristic water pressures? None (g = 1.0) g_G = 1.35 g_Q = 1.5 g_G = 1.35 to permanent part, g_Q = 1.5 to variable part Same gamma as applied to effective earth pressure Other (specify) Q22. What is the design thrust on the wall due to water pressure P_w in the ULS? Situation A, P_w,d(ULS) (in kN/m) = Situation B, P_w,d(ULS) (in kN/m) = Situation C, P_w,d(ULS) (in kN/m) = Q23. What is the design thrust on the wall due to effective earth pressure P'_a in the ULS? Situation A, P'_a,d(ULS) (in kN/m) = Situation B, P'_a,d(ULS) (in kN/m) = Situation C, P'_a,d(ULS) (in kN/m) = Q24. How did you determine effective earth pressures on the wall for ULS? Took active pressures (K_a) Took at-rest pressures (K₀) Took average of active and at-rest pressures (K_a + K₀)/2 Calculated approximate compaction pressures Other (specify) Q25. Please explain the reasons for your answer to the previous (plus any assumptions made) Concluding questions Q26. What other assumptions did you need to make to determine earth and water pressures? Q27. Please specify any other data that you would have liked to have had to determine earth and water pressures Q28. How conservative do you consider your previous national practice to be for this design example? Very conservative Conservative About right Unconservative Very unconservative Q29. How conservative do you consider Eurocode 7 (with your National Annex)to be for this design example? Very conservative Conservative About right Unconservative Very unconservative Q30. 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 Q31. Please provide any other relevant information needed to understand your solution to this design exercise

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