Distinct element analysis of unstable shear failure of rock discontinuities in underground mining conditions

The work presented in this paper focuses on improving the understanding of shear failure stability associated with underground mining by considering the relative stiffnesses of wall rocks and the failing discontinuity in addition to important shear strength and stress drop parameters. The study uses...

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Veröffentlicht in:International journal of rock mechanics and mining sciences (Oxford, England : 1997) England : 1997), 2014-06, Vol.68, p.44-54
Hauptverfasser: Gu, R., Ozbay, U.
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container_title International journal of rock mechanics and mining sciences (Oxford, England : 1997)
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Ozbay, U.
description The work presented in this paper focuses on improving the understanding of shear failure stability associated with underground mining by considering the relative stiffnesses of wall rocks and the failing discontinuity in addition to important shear strength and stress drop parameters. The study uses the Universal Distinct Element Code (UDEC) with the optional constitutive law, the continuously yielding joint model. The mine-scale numerical model consists of an advancing tabular excavation below a large horizontal discontinuity. Using this model, extensive simulations were performed to study the failure stabilities at selected points along the discontinuity as a function of mining geometry and the material properties of the discontinuity and its wall rocks. The results show that the failure stability is governed by the relative stiffnesses of the failing discontinuity and the loading stiffness of the wall rocks. The proneness and intensity of unstable failures is found to increase with increased normal stress and decreased loading stiffness. The findings also indicate that the loading stiffness is reduced with increased mining, decreased distance to discontinuity, and decreased elastic modulus of the rock resulting in an increased probability of unstable failures along the discontinuity. •Unstable shear failure analyses can be done using UDEC and CY joint model.•Stable and unstable failures can be distinguished in numerical simulations.•Models show failure processes of regions on a discontinuity during excavation.•Failure stability correlates to stress field and loading stiffness.•Various factors impact loading stiffness and stability of a discontinuity.
doi_str_mv 10.1016/j.ijrmms.2014.02.012
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The study uses the Universal Distinct Element Code (UDEC) with the optional constitutive law, the continuously yielding joint model. The mine-scale numerical model consists of an advancing tabular excavation below a large horizontal discontinuity. Using this model, extensive simulations were performed to study the failure stabilities at selected points along the discontinuity as a function of mining geometry and the material properties of the discontinuity and its wall rocks. The results show that the failure stability is governed by the relative stiffnesses of the failing discontinuity and the loading stiffness of the wall rocks. The proneness and intensity of unstable failures is found to increase with increased normal stress and decreased loading stiffness. The findings also indicate that the loading stiffness is reduced with increased mining, decreased distance to discontinuity, and decreased elastic modulus of the rock resulting in an increased probability of unstable failures along the discontinuity. •Unstable shear failure analyses can be done using UDEC and CY joint model.•Stable and unstable failures can be distinguished in numerical simulations.•Models show failure processes of regions on a discontinuity during excavation.•Failure stability correlates to stress field and loading stiffness.•Various factors impact loading stiffness and stability of a discontinuity.</description><identifier>ISSN: 1365-1609</identifier><identifier>EISSN: 1873-4545</identifier><identifier>DOI: 10.1016/j.ijrmms.2014.02.012</identifier><language>eng</language><publisher>Oxford: Elsevier Ltd</publisher><subject>Applied sciences ; Buildings. Public works ; Computation methods. Tables. 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The findings also indicate that the loading stiffness is reduced with increased mining, decreased distance to discontinuity, and decreased elastic modulus of the rock resulting in an increased probability of unstable failures along the discontinuity. •Unstable shear failure analyses can be done using UDEC and CY joint model.•Stable and unstable failures can be distinguished in numerical simulations.•Models show failure processes of regions on a discontinuity during excavation.•Failure stability correlates to stress field and loading stiffness.•Various factors impact loading stiffness and stability of a discontinuity.</description><subject>Applied sciences</subject><subject>Buildings. Public works</subject><subject>Computation methods. Tables. 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1873-4545
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source Elsevier ScienceDirect Journals Complete
subjects Applied sciences
Buildings. Public works
Computation methods. Tables. Charts
Continuously yielding joint model
Discontinuity
Exact sciences and technology
Failure
Geotechnics
Loading stiffness
Mathematical models
Mining
Miscellaneous
Rock
Rockburst
Soil mechanics. Rocks mechanics
Stability
Stiffness
Structural analysis. Stresses
UDEC
Unstable failure
Walls
title Distinct element analysis of unstable shear failure of rock discontinuities in underground mining conditions
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