Experimental determination of the relationship between permeability and microfracture-induced damage in bedded salt

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The development of deep underground structures (e.g., shafts, mines, storage and disposal caverns) significantly alters the stress state in the rock near the structure or opening. The effect of such an opening is to concentrate the far-field stress near the free surface. For soft rock such as salt, the concentrating effect of the opening induces deviatoric stresses in the salt that may be large enough to initiate microcracks which then propagate with time. The volume of rock susceptible to damage by microfracturing is often referred to as the disturbed rock zone and, by its nature, is expected to exhibit high ... continued below

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12 p.

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Pfeifle, T.W.; Brodsky, N.S. & Munson, D.E. March 1, 1998.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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The development of deep underground structures (e.g., shafts, mines, storage and disposal caverns) significantly alters the stress state in the rock near the structure or opening. The effect of such an opening is to concentrate the far-field stress near the free surface. For soft rock such as salt, the concentrating effect of the opening induces deviatoric stresses in the salt that may be large enough to initiate microcracks which then propagate with time. The volume of rock susceptible to damage by microfracturing is often referred to as the disturbed rock zone and, by its nature, is expected to exhibit high permeability relative to that of the native, far-field rock. This paper presents laboratory data that characterize microfracture-induced damage and the effect this damage has on permeability for bedded salt from the Waste Isolation Pilot Plant located in southeastern New Mexico. Damage is induced in the salt through a series of tertiary creep experiments and quantified in terms of dilatant volumetric strain. The permeability of damaged specimens is then measured using nitrogen gas as the permeant. The range in damage investigated included dilatant volumetric strains from less than 0.03 percent to nearly 4.0 percent. Permeability values corresponding to these damage levels ranged from 1 {times} 10{sup {minus}18} m{sup 2} to 1 {times} 10{sup {minus}12} m{sup 2}. Two simple models were fitted to the data for use in predicting permeability from dilatant volumetric strain.

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12 p.

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INIS; OSTI as DE98004242

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  • 12. international conference on computational methods in water resources, Heraklion (Greece), 15-19 Jun 1998

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  • Other: DE98004242
  • Report No.: SAND--98-0411C
  • Report No.: CONF-980670--
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 650168
  • Archival Resource Key: ark:/67531/metadc705804

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  • March 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • June 13, 2016, 7:28 p.m.

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Pfeifle, T.W.; Brodsky, N.S. & Munson, D.E. Experimental determination of the relationship between permeability and microfracture-induced damage in bedded salt, article, March 1, 1998; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc705804/: accessed July 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.