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Author:
Nejat Ozcimen
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2001-07-12 |
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hi
does anybody has info. about the subgrade modulus coefficient, k (t/m3) can be used for the settlement amount?
if the mat foundation system is rigid and the layer below it is sandy silty clay;
as far as i know it can not be used for the settlement calculations. it is only used for differencial deformations.?
empric correlations recommended for the k coefficient is 1500-2000 t/m3 for this soil structure.
But if you calculate that from the formula (Braja Das. "princ. of foun. engng.)it will be app. 150-200 t/m3.
and consequently:
if you use emprical values the settlement value is 1-2 cm.
and if the other, the sett. is 12-13 cm.
if i calculate the settlement by classical stress distribution method, it will be 15 cm.
i use this modulus as a soil parameter to the SAP2000 programme.
would you tell me that which value is reliable? and can i calculate the settlement amount by this way?..
thanks..
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Follow-up:
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Author:
Nejat Ozcimen
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2001-07-13 |
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thank you Paul,
i have two things that i need more info?
1st
as far as i understand, the subgrade reaction coefficient Kh (t/m3) can not be used for the setllement analysis. it is only used for deflection of the foundation.?
is settlement only determined by E (t/m2) layer by layer?
2nd
if i derive Kh (t/m3) by Kh=E/b(1-u2) it is app. 100-150 t/m3 but emprical correlations give 1500-2000 t/m3. in addition, 1st value represents very soft and slime soil condition? but it is not really. what is the difference betw. them.?
thanks..
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Follow-ups:
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Subject:
subgrade modulus 