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 Topic: Geotechnical design and analysis Subject: Modulus of Subgrade Reaction
 Author: Keith Wong 2000-10-06 Hi For circular opening in ground, E/(1-v)R relationship is well known. Then there is a lower bound limit to its use for increasingradius of opening. For example, 5m or 7m, etc. The Vesic equation for modulus of subgrade reaction for flat elasticfooting should be quite compatible to the above mentioned lower limit of E/R. Has anyone ever make a comparison between Vesic's equation and the lower limit (highest radius) of E/(1+v)R. My experience with these two formulae however says thatthe Vesic seems to have much higher value than the lower limit of E/(1+v)R For case of horse shoe opening, the flat invert is the typical placewhere one may want to choose between the two equation. It has significant influence to the bearing capacity at theinvert.Any people have any suggestion to their use in undergroundstructures? Reply to this posting
Follow-up:
 Author: David Cregger 2001-03-16 ...Wow, this is our problem, too!!!I have struggled with the bearing capacity of a horseshoe arch foundation and the theoretical solution is not published. Szechy has some solutions he translated from Russian or something, but I can't get it to work. The solution (Davidov?) predicts the uplift of the invert.We are undercutting an arch to lower the pavement elevation.This is my first time at the site, so next time I'll bring my reference and we can talk further.

Follow-up:
 Author: Leonardo Stadler 2001-08-26 Could you please state published references for the relationship k=E/R for the modulus of subgrade reaction?

Follow-up:
 Author: Maryam Akbarzad 2005-01-19 Dear sirMy name is Maryam Akbarzad and I am doing an MS in Geotechnical Engineering at the University of Tabriz. My subject of thesis is Investigaion about equations and the methods of estimation of the coefficient of subgrade reaction and analysis of the sensitivity of it in design of foundations and retaining walls. that would be very kind of you to provide me with any more lectures, books and etc. best regardsAkbarzadUniversity of Tabriz - IRANFaculty of Civil Engineering - Department of Geotechnical EngineeringMaryam Akbarzad