Methodology for determining time-dependent mechanical properties of tuff subjected to near-field repository conditions

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Description

We have established a methodology to determine the time dependence of strength and transport properties of tuff under conditions appropriate to a nuclear waste repository. Exploratory tests to determine the approximate magnitudes of thermomechanical property changes are nearly complete. In this report we describe the capabilities of an apparatus designed to precisely measure the time-dependent deformation and permeability of tuff at simulated repository conditions. Preliminary tests with this new apparatus indicate that microclastic creep failure of tuff occurs over a narrow strain range with little precursory Tertiary creep behavior. In one test, deformation under conditions of slowly decreasing effective pressure ... continued below

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51 p.

Creation Information

Blacic, J.D. & Andersen, R. January 1, 1983.

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Description

We have established a methodology to determine the time dependence of strength and transport properties of tuff under conditions appropriate to a nuclear waste repository. Exploratory tests to determine the approximate magnitudes of thermomechanical property changes are nearly complete. In this report we describe the capabilities of an apparatus designed to precisely measure the time-dependent deformation and permeability of tuff at simulated repository conditions. Preliminary tests with this new apparatus indicate that microclastic creep failure of tuff occurs over a narrow strain range with little precursory Tertiary creep behavior. In one test, deformation under conditions of slowly decreasing effective pressure resulted in failure, whereas some strain indicators showed a decreasing rate of strain.

Physical Description

51 p.

Notes

NTIS, PC A04/MF A01; OSTI as DE83007054

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  • Other Information: DN: Portions are illegible in microfiche products. Original copy available until stock is exhausted

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  • Other: DE83007054
  • Report No.: LA--9322-MS
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/59155 | External Link
  • Office of Scientific & Technical Information Report Number: 59155
  • Archival Resource Key: ark:/67531/metadc691750

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • January 1, 1983

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 29, 2016, 9:49 p.m.

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Blacic, J.D. & Andersen, R. Methodology for determining time-dependent mechanical properties of tuff subjected to near-field repository conditions, report, January 1, 1983; New Mexico. (digital.library.unt.edu/ark:/67531/metadc691750/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.