A dynamic damage constitutive model for rockmass with intermittent joints under uniaxial compression

LIU Hongyan; LI Junfeng; PEI Xiaolong

doi:10.11883/bzycj-2016-0261

Volume 38 Issue 2

Jan. 2018

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LIU Hongyan, LI Junfeng, PEI Xiaolong. A dynamic damage constitutive model for rockmass with intermittent joints under uniaxial compression[J]. Explosion And Shock Waves, 2018, 38(2): 316-323. doi: 10.11883/bzycj-2016-0261

Citation:

LIU Hongyan, LI Junfeng, PEI Xiaolong. A dynamic damage constitutive model for rockmass with intermittent joints under uniaxial compression[J]. Explosion And Shock Waves, 2018, 38(2): 316-323. doi: 10.11883/bzycj-2016-0261

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A dynamic damage constitutive model for rockmass with intermittent joints under uniaxial compression

doi: 10.11883/bzycj-2016-0261

1.
College of Engineering & Technology, China University of Geosciences (Beijing), Beijing 100083, China
2.
The Fourth Detachment, People's Armed Police Gold Forces, Liaoyang 111000, Liaoning, China

Received Date: 2016-08-25
Rev Recd Date: 2016-12-05
Publish Date: 2018-03-25

Abstract

Abstract

The intermittent joints have obvious effect on the strength and deformability of engineering rockmass. The joint is assumed to be a kind of macroscopic damage to the rockmass in the damage mechanics, therefore the damage tensor is adopted to describe its effect on the rockmass. Now three kinds of joint parameters such as the geometrical ones, strength ones and deformational ones are proposed in the academic circles to describe the joint physical and mechanical properties. However, the existing calculation methods of the rockmass damage tensor consider only the joint geometrical or strength parameters, not its deformational parameters such as normal stiffness and shear stiffness. Therefore, on the basis of the existing studies, the fracture and damage theory is adopted to propose the damage tensor calculation formula of the rockmass caused by an intermittent joint under uniaxial compression, and then that caused by one row or multi-row of joints in one set is given by considering the interaction of the joints. Secondly, based on the rock mesoscopic dynamic damage constitutive model and the viewpoint of macroscopic and mesoscopic damage coupling, a dynamic damage constitutive model for the rockmass with intermittent joints is proposed which can consider the joint geometrical, strength or deformational parameters at the same time. Finally, the effects of joint parameters and load strain rate on the rockmass dynamic mechanical behaviors are discussed with the proposed model. It is found the decrease in the joint length and the increase in the joint friction angle will increase the dynamic climax strength and elastic modulus of the rockmass. While with increasing the joint normal stiffness and shear stiffness, the dynamic climax strength and elastic modulus of the rockmass decrease and increase, respectively. While when the joint normal stiffness and shear stiffness increase in the same proportion, the dynamic climax strength and elastic modulus of the rockmass increase. The dynamic climax strength of the rockmass has a positive correlation with the load strain rate.
- rockmass,
- intermittent joints,
- stress intensity factor,
- uniaxial compression,
- dynamic damage,
- constitutive model,
- joint deformational parameters

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References(26)

References

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