Numerical Study of Failure Mechanism of Serial and Parallel Rock Pillars |
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| Authors: | S Y Wang S W Sloan M L Huang C A Tang |
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| Institution: | (1) Centre for Geotechnical and Materials Modelling, Civil, Surveying and Environmental Engineering, The University of Newcastle, Callaghan, NSW, 2308, Australia;(2) School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, People’s Republic of China;(3) School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian, 116024, People’s Republic of China |
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| Abstract: | Using a numerical modelling code, rock failure process analysis, 2D, the progressive failure process and associated acoustic
emission behaviour of serial and parallel rock samples were simulated. Both serial- and parallel sample models are presented
for investigating the mechanism of rock pillar failure. As expected, the numerical results show that not only the stiffness,
but also the uniaxial compressive strength of the rock plays an important role in pillar instability. For serial pillars,
the elastic rebound of a rock pillar with higher uniaxial compressive strength can lead to the sudden failure of an adjacent
rock pillar with lower uniaxial compressive strength. The failure zone forms and develops in the pillar with lower uniaxial
compressive strength; however, the failure zone does not pass across the interface of the two pillars. In comparison, when
two pillars have the same uniaxial compressive strengths but different elastic moduli, both serial pillars fail, and the failure
zone in the two pillars can interact, passing across the interface and entering the other pillar. For parallel pillars, damage
always develops in the pillar having the lower uniaxial compressive strength or lower elastic modulus. Furthermore, in accordance
with the Kaiser effect, the stress-induced damage in a rock pillar is irreversible, and only when the previous stress state
in the failed rock pillar is exceeded or the subsequent applied energy is larger than the energy released by the external
loading will further damage continue to occur. In addition, the homogeneity index of rock also can affect the failure modes
of parallel pillars, even though the uniaxial compressive strength and stiffness of each pillar are the same. |
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