Rock Failure in Compression

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Mechanisms of rock failure in compression--axial splitting and shear failiure-- are studied, based on a microscopic consideration. Analytical models are constructed and model experiments on plates of a brittle polymer are performed. It is shown that unstable growth of tension cracks which propagate from the tips of pre-existing cracks and curve towards the maximum compressive direction, is the fundamental mechanism that produces axial splitting of a uniaxially compressed rock specimen, whereas shear failure of a triaxially compressed specimen is a result of sudden growth of tension cracks at tips of a suitably arranged interacting set of microcracks. The simultaneous out-of-plane ... continued below

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381-385

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Nemat-Nasser, S. & Horii, H. December 15, 1983.

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Description

Mechanisms of rock failure in compression--axial splitting and shear failiure-- are studied, based on a microscopic consideration. Analytical models are constructed and model experiments on plates of a brittle polymer are performed. It is shown that unstable growth of tension cracks which propagate from the tips of pre-existing cracks and curve towards the maximum compressive direction, is the fundamental mechanism that produces axial splitting of a uniaxially compressed rock specimen, whereas shear failure of a triaxially compressed specimen is a result of sudden growth of tension cracks at tips of a suitably arranged interacting set of microcracks. The simultaneous out-of-plane unstable growth of a suitably oriented row of cracks is analyzed and, on the basis of this model, the variations of the ''ultimate strength'' and the orientation of the overall fault plane with the confining pressure are estimated. The brittle-ductile transition is discussed with the aid of a model which includes both tension crack extnesion and plastic zone development from the pre-existing cracks.

Physical Description

381-385

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  • Proceedings, Ninth Workshop Geothermal Reservoir Engineering, Stanford University, Stanford Calif., December 13-15, 1983

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  • Report No.: SGP-TR-74-51
  • Grant Number: AT03-80SF11459
  • Office of Scientific & Technical Information Report Number: 889764
  • Archival Resource Key: ark:/67531/metadc875746

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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.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • December 15, 1983

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Oct. 31, 2016, 6:41 p.m.

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Nemat-Nasser, S. & Horii, H. Rock Failure in Compression, article, December 15, 1983; United States. (digital.library.unt.edu/ark:/67531/metadc875746/: accessed December 10, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.