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umartorsion (Structural) (OP)
12 Feb 09 0:26
hi,
I want to know that If there is a relationship between modulus of subgrade reaction and bearing capcity..???

If I have a bearing capcity of 1tonn can I find the value of Modulus of subgrade reaction to use in Safe???

I have heard that bearing capcity can be converted into modulus of sub grade reaction by

Bearing Capcity x 12 x 3 = Modulus of subgrade reaction

Where BC in KSF

Is the above equation right
fattdad (Geotechnical)
12 Feb 09 9:51
I don't trust these relationships.

f-d

¡papá gordo ain't no madre flaca!

iandig (Civil/Environmental)
16 Feb 09 8:28
Follow the following link :
http://www.standardsforhighways.co.uk/dmrb/vol7/section2.htm
Open IAN 73/06, and within this document is a procedure and calculations for undertaking a static plate load test in order to determine the modulus of sub-grade reaction, equivalent CBR and E. There are also a number of imperical relationships between CBR to Cu [e.g. Cu = 27.15 x CBR^0.586].
Bearing capacity is a combination load, allowable settlement and a number of other properties. Eurocode 7 lists the Ultimate Bearing Capacity as:
Q/A' or qn = (c x Nc x sc x dc x ic x bc x gc) + (po x Nq x sq x dq x iq x bq x gq) + (1/2 x g x B x Ng x sg x dg x ig x bg x gg)which you then apply a factor of safety to to get the 'safe bearing capacity'.
In your original post you state that you 'have' a bearing capacity of 1 tonne, but not over what area or what settlement this is based against.
I am assuming you want to know k so that you can input this value into a further calculation [ground bearing floor slab ?]. Unfortunatley there is not enough information in your original post to come up with any direct guidance and by the time you have applied a number of correlations and imperical relationships, the trust you can place in the answer is very limited.
You would be better going back to the author of the bearing capacity '1 tonne' and getting them to advise on the data you need.  

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