Coupled analysis of change in fracture permeability during the cooling phase of the yucca mountain drift scale test

J. Rutqvist, B. Freifeld, Y. W. Tsang, K. B. Min, D. Elsworth

Research output: Contribution to conferencePaper

Abstract

This paper presents results from a coupled thermal, hydrological and mechanical analysis of thermally-induced permeability changes during heating and cooling of fractured volcanic rock at the Drift Scale Test at Yucca Mountain, Nevada. The analysis extends the previous analysis of the four-year heating phase to include newly available data from the subsequent four-year cooling phase. The new analysis of the cooling phase shows that the measured changes in fracture permeability follows that of a thermo-hydro-elastic model on average, but at several locations the measured permeability indicates (inelastic) irreversible behavior. At the end of the cooling phase, the air-permeability had decreased at some locations (to as low as 0.2 of initial), whereas it had increased at other locations (to as high as 1.8 of initial). Our analysis shows that such irreversible changes in fracture permeability are consistent with either inelastic fracture shear dilation (where permeability increased) or inelastic fracture surface asperity shortening (where permeability decreased). These data are important for bounding model predictions of potential thermally-induced changes in rock-mass permeability at a future repository at Yucca Mountain.

Original languageEnglish (US)
StatePublished - Dec 1 2008
Event42nd U.S. Rock Mechanics - 2nd U.S.-Canada Rock Mechanics Symposium 2008 - San Francisco, CA, United States
Duration: Jun 29 2008Jul 2 2008

Other

Other42nd U.S. Rock Mechanics - 2nd U.S.-Canada Rock Mechanics Symposium 2008
CountryUnited States
CitySan Francisco, CA
Period6/29/087/2/08

Fingerprint

mountains
permeability
Cooling
cooling
mountain
Volcanic rocks
Heating
Air permeability
heating
Rocks
air permeability
rocks
asperity
dilation
test
analysis
repository
volcanic rock
volcanology
thermal analysis

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology
  • Geophysics

Cite this

Rutqvist, J., Freifeld, B., Tsang, Y. W., Min, K. B., & Elsworth, D. (2008). Coupled analysis of change in fracture permeability during the cooling phase of the yucca mountain drift scale test. Paper presented at 42nd U.S. Rock Mechanics - 2nd U.S.-Canada Rock Mechanics Symposium 2008, San Francisco, CA, United States.
Rutqvist, J. ; Freifeld, B. ; Tsang, Y. W. ; Min, K. B. ; Elsworth, D. / Coupled analysis of change in fracture permeability during the cooling phase of the yucca mountain drift scale test. Paper presented at 42nd U.S. Rock Mechanics - 2nd U.S.-Canada Rock Mechanics Symposium 2008, San Francisco, CA, United States.
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Rutqvist, J, Freifeld, B, Tsang, YW, Min, KB & Elsworth, D 2008, 'Coupled analysis of change in fracture permeability during the cooling phase of the yucca mountain drift scale test', Paper presented at 42nd U.S. Rock Mechanics - 2nd U.S.-Canada Rock Mechanics Symposium 2008, San Francisco, CA, United States, 6/29/08 - 7/2/08.

Coupled analysis of change in fracture permeability during the cooling phase of the yucca mountain drift scale test. / Rutqvist, J.; Freifeld, B.; Tsang, Y. W.; Min, K. B.; Elsworth, D.

2008. Paper presented at 42nd U.S. Rock Mechanics - 2nd U.S.-Canada Rock Mechanics Symposium 2008, San Francisco, CA, United States.

Research output: Contribution to conferencePaper

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AU - Freifeld, B.

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AU - Elsworth, D.

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N2 - This paper presents results from a coupled thermal, hydrological and mechanical analysis of thermally-induced permeability changes during heating and cooling of fractured volcanic rock at the Drift Scale Test at Yucca Mountain, Nevada. The analysis extends the previous analysis of the four-year heating phase to include newly available data from the subsequent four-year cooling phase. The new analysis of the cooling phase shows that the measured changes in fracture permeability follows that of a thermo-hydro-elastic model on average, but at several locations the measured permeability indicates (inelastic) irreversible behavior. At the end of the cooling phase, the air-permeability had decreased at some locations (to as low as 0.2 of initial), whereas it had increased at other locations (to as high as 1.8 of initial). Our analysis shows that such irreversible changes in fracture permeability are consistent with either inelastic fracture shear dilation (where permeability increased) or inelastic fracture surface asperity shortening (where permeability decreased). These data are important for bounding model predictions of potential thermally-induced changes in rock-mass permeability at a future repository at Yucca Mountain.

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Rutqvist J, Freifeld B, Tsang YW, Min KB, Elsworth D. Coupled analysis of change in fracture permeability during the cooling phase of the yucca mountain drift scale test. 2008. Paper presented at 42nd U.S. Rock Mechanics - 2nd U.S.-Canada Rock Mechanics Symposium 2008, San Francisco, CA, United States.