The index properties and vane shear strengths of the cores taken at 

 the three sites are given in Tables 3, 4, and 5. Triaxial test results 

 are presented in the form of stress paths (Figures 3 through 6) . A 

 stress path is a plot of the principal stress difference versus the sum 

 of the major and minor principal effective stresses (o-> and 03). The 

 stress path diagram defines the drained strength parameters, Jj| and c, 

 and provides considerable additional data about the sediment's behavior 

 (as discussed by Lee, 1973b). 



ANALYSIS AND DISCUSSION 



As discussed above, no residual pore water pressures were retained 

 by samples from the two sites where in-place vane tests were performed. 

 This is because these samples contained relatively coarse-grained material 

 (50% or more sand-sized). The pore sizes are large, so the pore water 

 menisci at the sample surface have large radii. The residual pore water 

 pressures attainable vary inversely with the radii of the pore water 

 menisci. 



Table 3. Index Properties of Site I Cores 



Core 



No. 



Subbottom 

 Depth 



Water 



Content 



(%) 



Sand 

 (%) 



Silt 

 (%) 



Clay 

 (%) 



Color 



(Munsell) 



Original 



Vane 

 Strength 



Remolded 



Vane 

 Strength 



Liquid 

 Limit 

 (%) 



Plastic 

 Limit 



(%) 



Inches 



cm 







psi 



kPa 



psi 



kPa 



ID 



1.0 



2.5 



96.3 























IB 



1.5 



3.8 



97.7 











0.38 



2.6 



0.11 



0.8 



73.1 



34.7 



ID 



3.5 



8.9 



103.5 



2 



13 



85 



10YR4/3 

 brown/dk br 



0.32 



2.2 



0.13 



0.9 



78.4 



34.9 



IB 



4.0 



10.2 



111.8 























IB 



4.5 



11.4 



98.9 























ID 



6.5 



16.5 



99.5 























IB 



12.0 



30.5 



94.0 























IB 



14.0 



35.6 



97.5 











0.47 



3.2 



0.18 



1.2 



78.1 



37.3 



IB 



20.0 



50.8 



99.0 























ID 



21.0 



53.3 



94.5 























ID 



22.5 



57.2 



97.8 







7 



93 



10YR4/3 



0.63 



4.3 



0.27 



1.9 



85.1 



40.1 



ID 



25.0 

 36.0 



63.5 

 91.4 



94.0 

 100.0 























ID 



47.0 



119.4 



96.3 







7 



93 



10YR4/3 



0.64 



4.4 



0.25 



1.7 



110.5 



47.9 



