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Triaxial- and uniaxial-compression testing methods developed for extraction of pore water from unsaturated tuff, Yucca Mountain, Nevada

Description: To support the study of hydrologic system in the unsaturated zone at Yucca Mountain, Nevada, two extraction methods were examined to obtain representative, uncontaminated pore-water samples from unsaturated tuff. Results indicate that triaxial compression, which uses a standard cell, can remove pore water from nonwelded tuff that has an initial moisture content greater than 11% by weight; uniaxial compression, which uses a specifically fabricated cell, can extract pore water from nonwelded tuff… more
Date: 1989
Creator: Mower, T. E.; Higgins, J. D. & Yang, I. C.
Partner: UNT Libraries Government Documents Department
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Pore-water extraction from unsaturated tuff by triaxial and one-dimensional compression methods, Nevada Test Site, Nevada

Description: The hydrologic system in the unsaturated tuff at Yucca Mountain, Nevada, is being evaluated for the US Department of Energy by the Yucca Mountain Project Branch of the US Geological Survey as a potential site for a high-level radioactive-waste repository. Part of this investigation includes a hydrochemical study that is being made to assess characteristics of the hydrologic system such as: traveltime, direction of flow, recharge and source relations, and types and magnitudes of chemical reactio… more
Date: July 1, 1994
Creator: Mower, T. E.; Higgins, J. D.; Yang, In C. & Peters, C. A.
Partner: UNT Libraries Government Documents Department
open access

A preliminary study of the chemistry of pore water extracted from tuff by one-dimensional compression

Description: A specially designed and fabricated one-dimensional compression cell is being used to extract water from nonwelded and densely welded tuffs having degrees of saturation greater than 16 and 37 percent respectively. Chemical analyses of pore water obtained at increasing pressures are used to evaluate possible changes in chemistry caused by compression. The extracted pore water varies form a calcium chloride type to a sodium bicarbonate type. The mean concentration of dissolved ions generally decr… more
Date: October 1, 1992
Creator: Kharaka, Y. K.; Maest, A. S.; Peters, C. A.; Yang, I. C.; Higgins, J. D. & Burger, P. A.
Partner: UNT Libraries Government Documents Department
open access

The one-dimensional compression method for extraction of pore water from unsaturated tuff and effects on pore-water chemistry

Description: Study of the hydrologic system at Yucca Mountain, Nevada, requires extraction of pore-water samples from unsaturated tuff bedrock. Two generations of compression cells have been designed and tested for extracting representative, unaltered pore-water samples from unsaturated tuff cores. The one-dimensional compression cell has a maximum compressive stress rating of 552 MPa. Results from 86 tests show that the minimum degree of saturation for successful extraction of pore water was about 14% for … more
Date: December 31, 1997
Creator: Higgins, J. D.; Burger, P. A. & Yang, L. C.
Partner: UNT Libraries Government Documents Department
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