Using an Augmented Lagrangian Method and block fracturing in the DDA method

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This paper presents two extensions to the Discontinuous Deformation Analysis (DDA) method orginally proposed by Shi for modeling the response of blocky rock masses to mechanical loading. The first extension consists of improving the block contact algorithm. An Augmented Lagrangian Method is used to replace the Penalty Method orginally proposed. It allows Lagrange multipliers to be introduced without increasing the number of equations that need to be solved and thus, block contract forces can be calculated more accurately. A block fracturing capability based on a three-parameter Mohr-Coulomb criterion represents the second extension. It allows for shear or tensile fracturing of ... continued below

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6 p.

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Lin, C.T.; Amadei, B.; Sture, S. & Jung, J. January 1, 1994.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 12 times . More information about this article can be viewed below.

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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

This paper presents two extensions to the Discontinuous Deformation Analysis (DDA) method orginally proposed by Shi for modeling the response of blocky rock masses to mechanical loading. The first extension consists of improving the block contact algorithm. An Augmented Lagrangian Method is used to replace the Penalty Method orginally proposed. It allows Lagrange multipliers to be introduced without increasing the number of equations that need to be solved and thus, block contract forces can be calculated more accurately. A block fracturing capability based on a three-parameter Mohr-Coulomb criterion represents the second extension. It allows for shear or tensile fracturing of intact blocks and the formation of smaller blocks.

Physical Description

6 p.

Notes

INIS; OSTI as DE94005270

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  • 8. international conference on computer methods and advances in geomechanics, Morgantown, WV (United States), 22-28 May 1994

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  • Other: DE94005270
  • Report No.: SAND--93-0817C
  • Report No.: CONF-940506--3
  • Grant Number: AC04-76DP00789
  • Office of Scientific & Technical Information Report Number: 140727
  • Archival Resource Key: ark:/67531/metadc623053

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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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  • January 1, 1994

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  • June 16, 2015, 7:43 a.m.

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  • Aug. 23, 2016, 3:25 p.m.

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Lin, C.T.; Amadei, B.; Sture, S. & Jung, J. Using an Augmented Lagrangian Method and block fracturing in the DDA method, article, January 1, 1994; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc623053/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.