Analysis of Thermally Induced Changes in Fractured Rock Permeability during Eight Years of Heating and Cooling at the Yucca Mountain Drift Scale Test Metadata

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Title

  • Main Title Analysis of Thermally Induced Changes in Fractured Rock Permeability during Eight Years of Heating and Cooling at the Yucca Mountain Drift Scale Test

Creator

  • Author: Rutqvist, J.
    Creator Type: Personal
  • Author: Freifeld, B.
    Creator Type: Personal
  • Author: Min, K.-B.
    Creator Type: Personal
  • Author: Elsworth, D.
    Creator Type: Personal
  • Author: Tsang, Y.
    Creator Type: Personal

Contributor

  • Sponsor: Lawrence Berkeley National Laboratory. Earth Sciences Division.
    Contributor Type: Organization

Publisher

  • Name: Lawrence Berkeley National Laboratory
    Place of Publication: Berkeley, California
    Additional Info: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (United States)

Date

  • Creation: 2008-06-01

Language

  • English

Description

  • Content Description: We analyzed a data set of thermally induced changes in fractured rock permeability during a four-year heating (up to 200 C) and subsequent four-year cooling of a large volume, partially saturated and highly fractured volcanic tuff at the Yucca Mountain Drift Scale Test, in Nevada, USA. Permeability estimates were derived from about 700 pneumatic (air-injection) tests, taken periodically at 44 packed-off borehole intervals during the heating and cooling cycle from November 1997 through November 2005. We analyzed air-permeability data by numerical modeling of thermally induced stress and moisture movements and their impact on air permeability within the highly fractured rock. Our analysis shows that changes in air permeability during the initial four-year heating period, which were limited to about one order of magnitude, were caused by the combined effects of thermal-mechanically-induced stress on fracture aperture and thermal-hydrologically-induced changes in fracture moisture content. At the end of the subsequent four-year cooling period, air-permeability decreases (to as low as 0.2 of initial) and increases (to as high as 1.8 of initial) were observed. By comparison to the calculated thermo-hydro-elastic model results, we identified these remaining increases or decreases in air permeability as irreversible changes in intrinsic fracture permeability, consistent with either inelastic fracture shear dilation (where permeability increased) or inelastic fracture surface asperity shortening (where permeability decreased). In this paper, we discuss the possibility that such fracture asperity shortening and associated decrease in fracture permeability might be enhanced by dissolution of highly stressed surface asperities over years of elevated stress and temperature.

Subject

  • Keyword: Heating
  • Keyword: Fractures
  • STI Subject Categories: 58
  • Keyword: Apertures
  • Keyword: Pneumatics
  • STI Subject Categories: 54
  • Keyword: Moisture
  • Keyword: Dissolution
  • Keyword: Tuff
  • Keyword: Yucca Mountain
  • Keyword: Boreholes
  • Keyword: Permeability
  • Keyword: Shear

Source

  • Journal Name: International Journal of Rock Mechanics and Mining Sciences; Related Information: Journal Publication Date: 2008

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • Report No.: LBNL-446E
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1016/j.ijrmms.2008.01.016
  • Office of Scientific & Technical Information Report Number: 940396
  • Archival Resource Key: ark:/67531/metadc899651