Laboratory analysis of fluid flow and solute transport through a variably saturated fracture embedded in porous tuff

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Description

Laboratory techniques are developed that allow concurrent measurement of unsaturated matrix hydraulic conductivity and fracture transmissivity of fractured rock blocks. Two Apache Leap tuff blocks with natural fractures were removed from near Superior, Arizona, shaped into rectangular prisms, and instrumented in the laboratory. Porous ceramic plates provided solution to block tops at regulated pressures. Infiltration tests were performed on both test blocks. Steady flow testing of the saturated first block provided estimates of matrix hydraulic conductivity and fracture transmissivity. Fifteen centimeters of suction applied to the second block top showed that fracture flow was minimal and matrix hydraulic conductivity was ... continued below

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Medium: P; Size: 330 p.

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Chuang, Y.; Haldeman, W.R.; Rasmussen, T.C. & Evans, D.D. February 1, 1990.

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Description

Laboratory techniques are developed that allow concurrent measurement of unsaturated matrix hydraulic conductivity and fracture transmissivity of fractured rock blocks. Two Apache Leap tuff blocks with natural fractures were removed from near Superior, Arizona, shaped into rectangular prisms, and instrumented in the laboratory. Porous ceramic plates provided solution to block tops at regulated pressures. Infiltration tests were performed on both test blocks. Steady flow testing of the saturated first block provided estimates of matrix hydraulic conductivity and fracture transmissivity. Fifteen centimeters of suction applied to the second block top showed that fracture flow was minimal and matrix hydraulic conductivity was an order of magnitude less than the first block saturated matrix conductivity. Coated-wire ion-selective electrodes monitored aqueous chlorided breakthrough concentrations. Minute samples of tracer solution were collected with filter paper. The techniques worked well for studying transport behavior at near-saturated flow conditions and also appear to be promising for unsaturated conditions. Breakthrough curves in the fracture and matrix, and a concentration map of chloride concentrations within the fracture, suggest preferential flows paths in the fracture and substantial diffusion into the matrix. Average travel velocity, dispersion coefficient and longitudinal dispersivity in the fracture are obtained. 67 refs., 54 figs., 23 tabs.

Physical Description

Medium: P; Size: 330 p.

Notes

NTIS, PC A15/MF A01 - GPO - OSTI; OSTI as TI90007204

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  • Other Information: PBD: Feb 1990

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  • Other: TI90007204
  • Report No.: NUREG/CR--5482
  • DOI: 10.2172/137651 | External Link
  • Office of Scientific & Technical Information Report Number: 137651
  • Archival Resource Key: ark:/67531/metadc618546

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Office of Scientific & Technical Information Technical Reports

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Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • February 1, 1990

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  • June 16, 2015, 7:43 a.m.

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Chuang, Y.; Haldeman, W.R.; Rasmussen, T.C. & Evans, D.D. Laboratory analysis of fluid flow and solute transport through a variably saturated fracture embedded in porous tuff, report, February 1, 1990; United States. (digital.library.unt.edu/ark:/67531/metadc618546/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.