Generation and analysis of stable excavation shapes under high rock stresses

Russell T. Ewy, John M Kemeny, Ziqiong Zheng, Neville G.W. Cook

Research output: Contribution to conferencePaper

Abstract

Failure criteria based on micromechanical models of splitting failure and shear failure are implemented in boundary element programs to analyze the stability of various two-dimensional excavation shapes under high stress. A technique for modelling the failure processes of progressive spalling, shear, and tensile failure is developed and is used to simulate the formation of stable shapes through progressive failure. The shapes resulting from initially circular openings are strikingly similar to those recognized widely as well-bore breakouts. All the shapes studied lead to the formation of Pointed breakout regions, and these final shapes are stable with respect to splitting, shear, and tensile failure. The size of the failed region is smaller for the case of gradually increasing field stress around a preexisting opening than for an opening made instantaneously in rock with preexisting stress.

Original languageEnglish (US)
Pages981-985
Number of pages5
StatePublished - Jan 1 1987
Externally publishedYes
Event6th International Society for Rock Mechanics and Rock Engineering Congress, ISRM 1987 - Montreal, Canada
Duration: Aug 30 1987Sep 3 1987

Other

Other6th International Society for Rock Mechanics and Rock Engineering Congress, ISRM 1987
CountryCanada
CityMontreal
Period8/30/879/3/87

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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  • Cite this

    Ewy, R. T., Kemeny, J. M., Zheng, Z., & Cook, N. G. W. (1987). Generation and analysis of stable excavation shapes under high rock stresses. 981-985. Paper presented at 6th International Society for Rock Mechanics and Rock Engineering Congress, ISRM 1987, Montreal, Canada.