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POP, OCR

Nitharshan

Hi all, 

Anyone please explain about the POP , why this diagram differs with OCR and in which instance use POP? Can use both OCR and POP at the same time or any conditions are there?

Thanks, 

Nitha. 

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    Dear Nita,

    The diagrams are different because POP is different from OCR. POP is a fixed difference between current stress and preconsolidation stress whereas OCR is a fixed ratio between current stress and preconsolidation stress.

    Which one to use depends on the distribution of the preconsolidation stress with depth. In some parts of the world OCR is a better representation of the preconsolidation stress distribution and in other parts POP is better. Or one has to use them both....for instance in the Boston area over the first several meters depth POP gives the best results, but for  deeper soil OCR is better. But there are areas in South America where the opposite is the case: shallow layers are modelled with OCR and deeper layers with POP.

    It's not possible to use both POP and OCR together in one single material set. So in the cases I mentioned above where shallow layers need one system and deeper layers the other system one has to define 2 material set that are completely equal in parameters, only the POP/OCR is different.

    With kind regards,

    Dennis Waterman

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  • 0 Offline

    Dear Nita,

    The diagrams are different because POP is different from OCR. POP is a fixed difference between current stress and preconsolidation stress whereas OCR is a fixed ratio between current stress and preconsolidation stress.

    Which one to use depends on the distribution of the preconsolidation stress with depth. In some parts of the world OCR is a better representation of the preconsolidation stress distribution and in other parts POP is better. Or one has to use them both....for instance in the Boston area over the first several meters depth POP gives the best results, but for  deeper soil OCR is better. But there are areas in South America where the opposite is the case: shallow layers are modelled with OCR and deeper layers with POP.

    It's not possible to use both POP and OCR together in one single material set. So in the cases I mentioned above where shallow layers need one system and deeper layers the other system one has to define 2 material set that are completely equal in parameters, only the POP/OCR is different.

    With kind regards,

    Dennis Waterman

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