A dynamic damage constitutive model of rock mass by comprehensively considering macroscopic and mesoscopic flaws

Zhang Li-min; Lü Shu-ran; Liu Hong-yan

doi:10.11883/1001-1455-(2015)03-0428-09

Volume 35 Issue 3

Jun. 2015

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Zhang Li-min, Lü Shu-ran, Liu Hong-yan. A dynamic damage constitutive model of rock mass by comprehensively considering macroscopic and mesoscopic flaws[J]. Explosion And Shock Waves, 2015, 35(3): 428-436. doi: 10.11883/1001-1455-(2015)03-0428-09

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Zhang Li-min, Lü Shu-ran, Liu Hong-yan. A dynamic damage constitutive model of rock mass by comprehensively considering macroscopic and mesoscopic flaws[J]. Explosion And Shock Waves, 2015, 35(3): 428-436. doi: 10.11883/1001-1455-(2015)03-0428-09

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A dynamic damage constitutive model of rock mass by comprehensively considering macroscopic and mesoscopic flaws

doi: 10.11883/1001-1455-(2015)03-0428-09

Zhang Li-min^{1, 2},
Lü Shu-ran³,
Liu Hong-yan^{4, 5, 6
,
,}

1.
Civil and Environmental Engineering School, University of Science and Technology Beijing, Beijing 100083, China
2.
Hebei Chengde Iron and Steel Corporation, Chengde 850000, Hebei, China
3.
School of Safety and Environment Engineering, Capital University of Economics and Business, Beijing 100083, China
4.
College of Engineering & Technology, China University of Geoseiences(Beijing), Beijing 100083, China
5.
School of Engineering, Tibet University, Lasa 850000, Xizang, China
6.
Key Laboratory on Deep Geo Drilling Technology, Ministry of Land and Resources, China University of Geoseiences(Beijing), Beijing 100083, China

Received Date: 2013-10-30
Rev Recd Date: 2013-12-20
Publish Date: 2015-05-25

Abstract

Abstract

In view of the fact that the jointed rockmass contains both macroscopic flaws such as the joint and crack and the mesoscopic flaws such as the microcrack and microhole, the viewpoint that the above two kinds of flaws should be considered at the same time in the dynamic damage constitutive model of the jointed rockmass is proposed.Therefore, the rock classic dynamic damage constitutive model namely TCK model based on mesoscopic dynamic fracture mechanism is discussed, then the compound damage variable(tensor)comprehensively considering macroscopic and mesoscopic flaws based on Lemaitre equivalent strain hypothesis is deduced.Finally, the corresponding dynamic damage constitutive model is established, and the effect law of the load strain ratio and joint set on rock mass dynamic mechanical property is discussed with this model.The results show that under different load strain rates, the initial deformation stage of the samples coincides with each other, and then with increase of strain, the climax strength, strain and the total strain of the samples all increase.With increase in joint sets, the climax strength of the samples gradually decreases, but the reduction degree gradually becomes little and tends to a certain value.The basic law between the above research conclusions and the current experimental and theoretical results is the same, which demonstrates the rationality of this model.
- mechanics of explosion,
- dynamic damage constitutive model,
- macroscopic flaw,
- mesoscopic flaw,
- dynamic fracture mechanism,
- compound damage variable,
- jointed rock mass

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References(19)

References

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