Dynamic characteristics of marble damaged by cyclic loading

YU Liyuan; ZHU Zihan; MENG Qingbin; JING Hongwen; SU Haijian; HE Ming

doi:10.11883/bzycj-2019-0164

Volume 39 Issue 8

Aug. 2019

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YU Liyuan, ZHU Zihan, MENG Qingbin, JING Hongwen, SU Haijian, HE Ming. Dynamic characteristics of marble damaged by cyclic loading[J]. Explosion And Shock Waves, 2019, 39(8): 083102. doi: 10.11883/bzycj-2019-0164

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YU Liyuan, ZHU Zihan, MENG Qingbin, JING Hongwen, SU Haijian, HE Ming. Dynamic characteristics of marble damaged by cyclic loading[J]. Explosion And Shock Waves, 2019, 39(8): 083102. doi: 10.11883/bzycj-2019-0164

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Dynamic characteristics of marble damaged by cyclic loading

doi: 10.11883/bzycj-2019-0164

1.
State key laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and technology, Xuzhou 221116, Jiangsu China
2.
State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army University of Engineering, Nanjing 210007, Jiangsu, China

Received Date: 2019-04-25
Rev Recd Date: 2019-05-21
Publish Date: 2019-08-01

Abstract

Abstract

The rock mass will bear the cyclic loading during the construction of underground engineering. Mechanical properties of the damaged rock mass under disturbance of cyclic loading are important for supporting capacity of the surrounding rock. Moreover, the disturbed rock mass is also potentially threatened by impact loads such as blasting. Therefore, it is necessary to investigate the re-bearing mechanical behavior of disturbing rock mass under cyclic loading. The cyclic loading experiments with four various maximum cyclic stress levels were carried out by using MTS 815 test system. The maximum cycling stresses are 80%, 85%, 90%, and 95% of uniaxial compressive strength respectively and the numbers of cycle are set to be 20, 40, 60 and 80 for each maximum cyclic stresses. The dynamic tests of the disturbed rock sample were conducted by using split Hopkinson pressure bar (SHPB). We analyzed the effects of maximum cyclic stress and the numbers of cycle on plastic strain and revealed the evolution law of dynamic strength and dynamic elastic modulus of marble with damage variable. The test results show that the plastic strain positively correlated with cycles, and the larger the maximum cycling stress, the more the cycles required to reach the stable plastic strain. The dynamic uniaxial compressive strength and dynamic elastic modulus decrease exponentially with the increase of the damage variable. The ratio of breakage energy divided into two stages and the critical point of damage variable is D=0.343. When D<0.343, the breakage energy ratio is stable at about 10%, and the value is about 13 J. When D>0.343, the ratio of breakage energy increases with the increase of damage variable. The findings of this research can provide guidelines for the selection of the mechanical parameters of the surrounding rock and the optimization of the support scheme.
- rock mechanics,
- cyclic loading,
- SHPB,
- damage variable,
- dynamic properties,
- energy

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References(31)

References

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