TY - CONF
T1 - Generation and analysis of stable excavation shapes under high rock stresses
AU - Ewy, Russell T.
AU - Kemeny, John M.
AU - Zheng, Ziqiong
AU - Cook, Neville G.W.
N1 - Funding Information:
The authors wish to acknowledge support from the following sources: The Office of Civilian Radioactive Waste Management through the Office of Geologic Repositories, the U.S. Bureau of Mines for Grant No. G1164106 to the California Mining and Mineral ResourcesResearch Institute, and the Jane Lewis Fellowship Fund at the University of California, Berkeley.
Publisher Copyright:
© 6th ISRM Congress 1987. All rights reserved.
PY - 1987
Y1 - 1987
N2 - 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.
AB - 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.
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M3 - Paper
AN - SCOPUS:85056142314
SP - 981
EP - 985
T2 - 6th International Society for Rock Mechanics and Rock Engineering Congress, ISRM 1987
Y2 - 30 August 1987 through 3 September 1987
ER -