Effect of discontinuities roughness having different slope angles on the strength of jointed rock under triaxial stresses

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Aminpour Fatemeh; Moomivand Hassan

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Paper Information

Journal: IRANIAN JOURNAL OF MINING ENGINEERING (IRJME) Year:2018 | Volume:13 | Issue:40 Page(s): 60-76

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Title

Effect of discontinuities roughness having different slope angles on the strength of jointed rock under triaxial stresses

Author(s)

Aminpour Fatemeh | Moomivand Hassan | Issue Writer Certificate

Keywords

discontinuityQ2

roughnessQ1

slope angleQ1

model materialQ1

Abstract

Effect of discontinuities roughness including tooth-shaped asperity, rough undulating and smooth plane having different orientations respect to confining pressure on the strength of rock under triaxial stresses has been investigated in this research. 15 groups of specimens having three types of discontinuities roughness and five types of slope angles from 0 to 90 degrees have been successfully prepared and tested under triaxial stresses. The axial strength of rough undulating and tooth-shaped asperity discontinuities decreases a little with increasing slope angle from 30 to 45 degrees under constant confining pressure and in general the axial strength of smooth plane discontinuities having different orientations is less than the axial strength of rough undulating and tooth-shaped asperity discontinuities under the different confining pressures. For tooth-shaped asperity discontinuities having orientation angles 45 degrees, failure also occurred at the body of the specimens particularly with increasing the confining pressure. Sliding occurred at the one side of tooth-shaped asperities of discontinuity having orientation angles of 60 degree under uniaxial loading and displacement took place at the direction of discontinslopeuities. But tooth-shaped asperities were broken along the discontinuities under the higher confining pressures. The effect slope angle on the axial strength decreases with an increase of confining pressure and rate of reducing the axial strength increases with an increase of discontinuity roughness. As, the strength of specimens having very rough discontinuities under high confining pressures approaches to the strength of massive (intact) rock. The maximum axial strength to the minimum axial strength ratio (Rtriax) has high value for the zero confining pressure and it decreases sharply as a negative power function of confining pressure then approaches to a constant value.

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APA: Copy

Aminpour, Fatemeh, & Moomivand, Hassan. (2018). Effect of discontinuities roughness having different slope angles on the strength of jointed rock under triaxial stresses. IRANIAN JOURNAL OF MINING ENGINEERING (IRJME), 13(40 ), 60-76. SID. https://sid.ir/paper/117039/en

Vancouver: Copy

Aminpour Fatemeh, Moomivand Hassan. Effect of discontinuities roughness having different slope angles on the strength of jointed rock under triaxial stresses. IRANIAN JOURNAL OF MINING ENGINEERING (IRJME)[Internet]. 2018;13(40 ):60-76. Available from: https://sid.ir/paper/117039/en

IEEE: Copy

Fatemeh Aminpour, and Hassan Moomivand, “Effect of discontinuities roughness having different slope angles on the strength of jointed rock under triaxial stresses,” IRANIAN JOURNAL OF MINING ENGINEERING (IRJME), vol. 13, no. 40 , pp. 60–76, 2018, [Online]. Available: https://sid.ir/paper/117039/en

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