Testing Chamber Overview: Once a test specimen is isolated in the ESC (see Browse Graphic for image of the ESC in operation), the sediment is extruded from the plastic core liner using a plunger that will eventually serve as the specimen’s top endcap once the specimen is pushed all the way out of the liner and into the primary testing space. The plunger is then used to apply a vertical effective stress, returning the specimen to its in situ state of effective stress (approximately 2 MPa). The consolidation data measured while applying the full range of vertical stresses are provided in a separate data release within this larger work (see "PCCT measurements of the consolidation characteristics, constrained modulus and compressional wave velocity for fine-grained sediment collected from Area C, Krishna-Godavari Basin during India's National Gas Hydrate Program, NGHP-02" in Jang and others, (2018)). For permeability testing in the primary testing chamber of the ESC, a thin latex sleeve is pressed against the cylindrical sides of the specimen. The upper and lower specimen endcaps have porous stones connected to fluid flow lines that enable flow-through vertical permeability measurements to be made. With the latex sleeve held against the specimen by a small imposed confining stress (less than 300 kPa), fluid is restricted to flow through the specimen rather than around it. The ESC and its operations are described in Santamarina and others (2012, 2015).
Jang, J., Dai, S., Yoneda, J., Waite, W.F., Collett T.S., and Kumar, P., 2018, Pressure core characterization tool measurements of compressibility, permeability, and shear strength of fine-grained sediment collected from Area C, Krishna-Godavari Basin, during India's National Gas Hydrate Program Expedition NGHP-02: U.S. Geological Survey data release, https://doi.org/10.5066/P91XJ7DP
Santamarina, J.C., Dai, S., Jang, J., and Terzariol, M., 2012, Pressure core characterization tools for hydrate-bearing sediments. Scientific Drilling, v. 14, p. 44-48.
Santamarina, J.C., Dai, S., Terzariol, M., Jang, J., Waite, W.F., Winters, W.J., Nagao, J., Yoneda, J., Konno, Y., Fujii, T., and Suzuki, K., 2015, Hydro-bio-geomechanical properties of hydrate-bearing sediments from Nankai Trough. Marine and Petroleum Geology, v. 66, p. 434-450.