Figure F7. Effective stress, void ratio, and hydraulic conductivity profile for Site 1257. Stress history data were used to calculate the maximum past effective stress profile for the sedimentary column (Equation 19) and predict in situ e from consolidation test results (Equation 18). At Site 1257, 1200 kPa of overburden was added to the hydrostatic effective stress profile to determine the maximum past effective stress (Table T1). Laboratory measurements of e (gray diamonds) were rebound corrected (Equation 17, black triangles) using the hydrostatically determined effective stress profile (Equation 5), except for Unit V of Site 1257, where significant underconsolidation was present. For this unit, the present effective stress is equal to the maximum past effective stress and is used for both rebound corrections of laboratory measurements and e predictions from consolidation test results. The hydraulic conductivity of sediments was calculated in two ways: (1) by using the e-log(k) relationship for individual lithotypes on the rebound-corrected laboratory measurements of e (black stars) and (2) by applying the e-log(k) relationship to the predicted e profile (orange line) (Table T3). Often the predicted e overestimates the in situ e, and thus serves as an upper bound to sediment permeability. For Unit III, an upper and lower permeability were determined by applying the e-log(k) relationship from Samples 207-1257C-6R-3, 140 cm, and 207-1258B-36R-2, 45 cm. Blue shading represents a qualitative estimate for the possible range of hydraulic conductivity within each lithologic unit.

Figure F7. Effective stress, void ratio, and hydraulic conductivity profile for Site 1257. Stress history data were used to calculate the maximum past effective stress profile for the sedimentary column (Equation 19) and predict in situ e from consolidation test results (Equation 18). At Site 1257, 1200 kPa of overburden was added to the hydrostatic effective stress profile to determine the maximum past effective stress (Table T1). Laboratory measurements of e (gray diamonds) were rebound corrected (Equation 17, black triangles) using the hydrostatically determined effective stress profile (Equation 5), except for Unit V of Site 1257, where significant underconsolidation was present. For this unit, the present effective stress is equal to the maximum past effective stress and is used for both rebound corrections of laboratory measurements and e predictions from consolidation test results. The hydraulic conductivity of sediments was calculated in two ways: (1) by using the e-log(k) relationship for individual lithotypes on the rebound-corrected laboratory measurements of e (black stars) and (2) by applying the e-log(k) relationship to the predicted e profile (orange line) (Table T3). Often the predicted e overestimates the in situ e, and thus serves as an upper bound to sediment permeability. For Unit III, an upper and lower permeability were determined by applying the e-log(k) relationship from Samples 207-1257C-6R-3, 140 cm, and 207-1258B-36R-2, 45 cm. Blue shading represents a qualitative estimate for the possible range of hydraulic conductivity within each lithologic unit.