Results from the experiment are included in Tables T4, T5, T6, T7, T8, T9, T10, T11, T12, and T13 and Figures F3, F4, F5, F6, F7, F8, and F9. Compression indices (cc) for the samples ranged from 0.19 to 0.37, and expansion indices were approximately 10% of the compression indices (0.02 < ce < 0.029) (Table T3). Sample 194-1194A-5H-3, 135–137 cm, had the greatest decrease in void ratio during loading (Fig. F3). This was the shallowest sample, and its entire deformation path was plastic deformation. Samples 194-1194A-8H-3, 138–140 cm, and 194-1198A-21H-3, 140–142 cm, had the highest compression indices (Table T3) but experienced plastic deformation for stresses exceeding ~1 MPa (Figs. F4B, F9); they had less total deformation than Sample 194-1194A-5H-3, 135–137 cm, which had a lower compression index.
Estimated permeability (Table T3) was greatest (5.4 x 10–16 m2) for Sample 194-1198A-15H-3, 135–137 cm, at an effective vertical stress of 0.99 MPa. The same sample had the lowest estimated permeability (1.9 x 10–18 m2) of all the experiments at an effective vertical stress of 5.3 MPa. The consolidation experiments were performed without sample backpressure; therefore, partial air saturation may have developed. Partial air saturation impedes water drainage; thus, the consolidation-based permeability could be lower than the absolute permeability of the sample with 100% water saturation. Moran et al. (1995) compared consolidation-estimated permeability to low-gradient permeability measurements and documented that consolidation-estimated permeability was equal to or lower than direct low-gradient measurements of permeability. With the possibility of partial air saturation and the consolidation method of estimating permeability, our estimates are considered a lower bound on permeability for these sediments.
Holes 1194A and 1198A have similar d10 and d50 that do not vary significantly with depth (Table T3). Exceptions to this are (1) increased d10 (1.3 µm) of Sample 194-1194A-11H-3, 135–137 cm, and (2) increased d50 (54 µm) of Sample 194-1198A-13H-3, 139–141 cm (Table T3). The major grain size variation between the sites is d90; Hole 1194A has a maximum d90 = 89 µm, and d90 decreases with depth. In contrast, Hole 1198A is dominated by d90 > 100 µm and shows no depth trend (Table T3).