Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/54566
Type: | Conference paper |
Title: | Coupled analysis of change in fracture permeability during the cooling phase of the Yucca Mountain drift scale test |
Author: | Rutqvist, Jonny Freifeld, Barry Tsang, Y. Min, Ki-Bok Elsworth, Derek |
Citation: | Proceedings of the 42nd U.S. Rock Mechanics Symposium, San Francisco, CA, June 29-July 2, 2008: pp. 1-9 |
Publisher: | ARMA |
Issue Date: | 2008 |
Conference Name: | U.S. Rock Mechanics Symposium (42nd : 2008 : San Francisco, CA) |
School/Discipline: | School of Civil, Environmental and Mining Engineering |
Statement of Responsibility: | Rutqvist, J.; Freifeld, B.; Tsang, Y.W.; Min, J.K. and Elsworth, D. |
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 fouryear 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. |
Description (link): | http://www.osti.gov/bridge/product.biblio.jsp?osti_id=934771 |
Appears in Collections: | Civil and Environmental Engineering publications |
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