Generation and analysis of stable excavation shapes under high rock stresses

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

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 conference › Paper › peer-review

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 language	English (US)
Pages	981-985
Number of pages	5
State	Published - 1987
Externally published	Yes
Event	6th International Society for Rock Mechanics and Rock Engineering Congress, ISRM 1987 - Montreal, Canada Duration: Aug 30 1987 → Sep 3 1987

Other

Other	6th International Society for Rock Mechanics and Rock Engineering Congress, ISRM 1987
Country	Canada
City	Montreal
Period	8/30/87 → 9/3/87

ASJC Scopus subject areas

Geophysics
Geochemistry and Petrology

Access to Document

Fingerprint Dive into the research topics of 'Generation and analysis of stable excavation shapes under high rock stresses'. Together they form a unique fingerprint.

Cite this

@conference{03203783897147d8aba6cc3dd07a1d3b,

title = "Generation and analysis of stable excavation shapes under high rock stresses",

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.",

author = "Ewy, {Russell T.} and Kemeny, {John M.} and Ziqiong Zheng and Cook, {Neville G.W.}",

note = "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.; 6th International Society for Rock Mechanics and Rock Engineering Congress, ISRM 1987 ; Conference date: 30-08-1987 Through 03-09-1987",

year = "1987",

language = "English (US)",

pages = "981--985",

}

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.

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.

UR - http://www.scopus.com/inward/record.url?scp=85056142314&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85056142314&partnerID=8YFLogxK

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 -