Soil (Sand) Seabed Stiffness

[JT100]

I am trying to calculate the lateral and vertical stiffness of the seabed, i have done this for clay type soils previously using DNV RP F105 (7.4.10) and I am presently doing some calcs for a seabed made up of sand. The formulas given use the specific mass ratio, diameter and dynamic stiffness factors (lateral and vertical). The dynamic stiffness factors are taken from tables 7.5 (sand) and 7.6 (clay). However when using the values for loose sand the vertical and lateral stiffnesses come out at in the region of 8e5 and 5e5 N/m/m however the clay values are a lot larger at 1.5e7 and 1.0e7 N/m/m which seems a bit stiff, and seems to be messing up my finite element model. Is there any other standards that offer alternative methods of caclualting the soil stiffnesses? thanks.

 

[jdonville]

Jt100,

Try reposting in the Geotechnical forums.

Jeff