Effect of boundary conditions on the strength and deformability of replicas of natural fractures in welded tuff: Data analysis

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Description

Assessing the shear behavior of intact rock & rock fractures is an important issue in the design of a potential nuclear waste repository at Yucca Mountain Nevada. Cyclic direct shear experiments were conducted on replicas of three natural fractures and a laboratory-developed tensile fracture of welded tuff. The tests were carried out under constant normal loads or constant normal stiffnesses with different initial normal load levels. Each test consisted of five cycles of forward and reverse shear motion. Based on the results of the shear tests conducted under constant normal load, the shear behavior of the joint replicas tested under ... continued below

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223 p.

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Wibowo, J.; Amadei, B.; Sture, S. & Price, R.H. April 1, 1994.

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  • Wibowo, J.
  • Amadei, B.
  • Sture, S. Colorado Univ., Boulder, CO (United States). Dept. of Civil, Environmental, and Architectural Engineering
  • Price, R.H. Sandia National Labs., Albuquerque, NM (United States)

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Description

Assessing the shear behavior of intact rock & rock fractures is an important issue in the design of a potential nuclear waste repository at Yucca Mountain Nevada. Cyclic direct shear experiments were conducted on replicas of three natural fractures and a laboratory-developed tensile fracture of welded tuff. The tests were carried out under constant normal loads or constant normal stiffnesses with different initial normal load levels. Each test consisted of five cycles of forward and reverse shear motion. Based on the results of the shear tests conducted under constant normal load, the shear behavior of the joint replicas tested under constant normal stiffness was predicted by using the graphical analysis method of Saeb (1989), and Amadei and Saeb (1990). Comparison between the predictions and the actual constant stiffness direct shear experiment results can be found in a report by Wibowo et al. (1993b). Results of the constant normal load shear experiments are analyzed using several constitutive models proposed in the rock mechanics literature for joint shear strength, dilatancy, and joint surface damage. It is shown that some of the existing models have limitations. New constitutive models are proposed and are included in a mathematical analysis tool that can be used to predict joint behavior under various boundary conditions.

Physical Description

223 p.

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INIS; OSTI as DE94013363

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  • Other Information: PBD: Apr 1994

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  • Other: DE94013363
  • Report No.: SAND--93-7079
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/145258 | External Link
  • Office of Scientific & Technical Information Report Number: 145258
  • Archival Resource Key: ark:/67531/metadc621900

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  • April 1, 1994

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 14, 2016, 9:37 p.m.

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Wibowo, J.; Amadei, B.; Sture, S. & Price, R.H. Effect of boundary conditions on the strength and deformability of replicas of natural fractures in welded tuff: Data analysis, report, April 1, 1994; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc621900/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.