Geomechanical analysis of the large block test

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Description

The Yucca Mountain Site Characterization Project is investigating the Topopah Spring tuff at Yucca Mountain, Nevada, to determine whether it is suitable as a host rock for the disposal of high-level nuclear wastes. The Large Block Test (LBT) at Fran Ridge was planned as part of the project to investigate coupled thermal-mechanical-hydrological and geochemical processes that may occur in the repository near-field environment. This test would be performed on an excavated block of Topopah Spring tuff and would provide information at an intermediate scale (1-10 m) that would help evaluate existing models for repository performance. As part of the LBT, ... continued below

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46 p.

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Blair, S.C.; Berge, P.A. & Wang, H.F. August 1, 1996.

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Description

The Yucca Mountain Site Characterization Project is investigating the Topopah Spring tuff at Yucca Mountain, Nevada, to determine whether it is suitable as a host rock for the disposal of high-level nuclear wastes. The Large Block Test (LBT) at Fran Ridge was planned as part of the project to investigate coupled thermal-mechanical-hydrological and geochemical processes that may occur in the repository near-field environment. This test would be performed on an excavated block of Topopah Spring tuff and would provide information at an intermediate scale (1-10 m) that would help evaluate existing models for repository performance. As part of the LBT, we are analyzing the coupled thermal-mechanical- hydrological behavior of the block in response to heating. Our objectives are to aid in the experimental design of the test, to evaluate different thermal and constitutive models, and to evaluate several different numerical methods. In this report, we present results of thermal-mechanical simulations of the heat-up phase of the LBT conducted using two different numerical codes that are commercially available: a two-dimensional (2D), finite- difference model called FLAC and a three-dimensional (3D), finite- element model, called ABAQUS. The purpose of this initial numerical modeling is to calculate temperatures, stresses, and displacements in two and three dimensions for a simplified representation of the large block. In reality, numerous joints and fractures complicate the behavior of the large block significantly. Nonetheless, these 1218 simulations provide a general understanding of the thermal-mechanical behavior to be expected in the LBT.

Physical Description

46 p.

Notes

OSTI as DE97052092

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  • Other Information: PBD: Aug 1996

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  • Other: DE97052092
  • Report No.: UCRL-ID--122898
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/464298 | External Link
  • Office of Scientific & Technical Information Report Number: 464298
  • Archival Resource Key: ark:/67531/metadc687534

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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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  • August 1, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:21 a.m.

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  • Feb. 18, 2016, 5:20 p.m.

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Blair, S.C.; Berge, P.A. & Wang, H.F. Geomechanical analysis of the large block test, report, August 1, 1996; California. (digital.library.unt.edu/ark:/67531/metadc687534/: accessed November 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.