Mechanical properties of fractures from drillholes, UE25-NRG-4; USW-NRG-6; USW-NRG-7; USW-SD-9, at Yucca Mountain, Nevada

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Rock cores from drillholes UE25-NRG-4, USW-NRG-6, USW-NRG-7, and USW-SD-9 containing natural fractures were obtained from the Sample Management Facility at Yucca Mountain, Nevada. All recoverable fractures were sheared at constant normal stresses from 2.5 to 15 MPa, in the as-received condition (air-dry). Detailed profilometer data were collected from each fracture surface before testing. The tests yielded the normal closure as a function of normal stress, and the shear stress and dilation as functions of shear offset. The constitutive properties obtained from these stress-displacement relations were: normal stiffness, shear stiffness, shear strength, and dilation angle at peak shear stress. Shear strength ... continued below

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88 p.

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Olsson, W.A. & Brown, S.R. January 1, 1997.

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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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Description

Rock cores from drillholes UE25-NRG-4, USW-NRG-6, USW-NRG-7, and USW-SD-9 containing natural fractures were obtained from the Sample Management Facility at Yucca Mountain, Nevada. All recoverable fractures were sheared at constant normal stresses from 2.5 to 15 MPa, in the as-received condition (air-dry). Detailed profilometer data were collected from each fracture surface before testing. The tests yielded the normal closure as a function of normal stress, and the shear stress and dilation as functions of shear offset. The constitutive properties obtained from these stress-displacement relations were: normal stiffness, shear stiffness, shear strength, and dilation angle at peak shear stress. Shear strength plotted against normal stress for four thermomechanical units shows that friction angle varies from 370 to 460 and cohesion varies from 0.02 to 1.71 MPa.

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88 p.

Notes

INIS; OSTI as DE97004265

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  • Other Information: PBD: Jan 1997

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  • Other: DE97004265
  • Report No.: SAND--95-1736
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/444078 | External Link
  • Office of Scientific & Technical Information Report Number: 444078
  • Archival Resource Key: ark:/67531/metadc677559

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  • January 1, 1997

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  • July 25, 2015, 2:21 a.m.

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  • May 18, 2016, 6:04 p.m.

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Olsson, W.A. & Brown, S.R. Mechanical properties of fractures from drillholes, UE25-NRG-4; USW-NRG-6; USW-NRG-7; USW-SD-9, at Yucca Mountain, Nevada, report, January 1, 1997; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc677559/: accessed August 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.