Page 149 - Pipelines and Risers

122 Chapter 9

Offshore sedimentation soils may convenient be labeled as either sandy soils or clayey soils.
The soils parameters requested from pipeline projects are listed in Table 9.1 for sand and clay
respectively.
Table 9.1 Design parameters for sandy and clayey soils.

Sandy soil Clayey soil
Material Gradient Liquid and plastic limits
parameters Suecific gravity
I I Void ratios in loosest and densest state 1 Specific gravity I
Remoulded shear strength
Insitu Void ratio and density index Water content and
parameters liquidity index
Bulk and dry densities Bulk and dry densities
Peak friction angle Undrained shear strength
Modulus of subgrade reaction Drained shear strength
Permeability sensitivity
consolidation parameters
Modulus of subgrade
reaction
The parameters in Table 9.1 may be derived from laboratory testing, in-situ testing or
estimated from the geotechnical literature.
Recommended values of some of the key parameters are listed in Table 9.2