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doi:10.2204/iodp.proc.314315316.208.2011

Experimental results

All consolidation and grain-size data are summarized in Table T3. All nomenclature is provided in Table T4. Complete experimental data are provided in 316_CONSOL in “Supplementary material.”

Based on interpretation of CRS consolidation experiments, we define the range of geotechnical parameters at Sites C0004 and C0006–C0008. Our estimates of in situ permeability (k_epc′ ) range from 4.6 × 10^–14 m² to 1.1 × 10^–16 m² with most permeabilities <10^–14 m² (Table T3; Fig. F4). The compression indexes of the specimens vary widely from a minimum of 0.15 to a maximum of 0.9 (Table T3; Fig. F4). The permeability and compression behavior do not have any strong depth, stress, or sample-orientation trends. The overconsolidation ratio, however, decreases with increasing depth (Fig. F4). The maximum OCR is 42 at 2.39 meters below seafloor (mbsf) (Hole C0006E) and the minimum is <1 at 48.31 and 91.74 mbsf (Holes C0006E and C0007C, respectively) (Table T3).

Grain-size analysis data for Sites C0004 and C0006–C0008 show that the samples are dominated by silt- and clay-sized particles (Table T3). Silt-sized particle contents of the vertically oriented specimens range from 47% to 69%. The highest sand-sized particle content is 44% (48.31 mbsf in Hole C0006E) and the highest clay-sized particle content is 42% (17.31 mbsf in Hole C0004C). Excluding the sand-dominated specimen (48.31 mbsf in Hole C0006E), the median grain size (D₅₀) of specimens ranges from 0.003 to 0.026 mm (Table T3; Fig. F4).

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