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Comparison of Shape Characteristics of Plastic Zone Around Circular Tunnel Under Different Strength Criteria

Published online by Cambridge University Press:  23 October 2020

H. Y. Shi Open the ORCID record for H. Y. Shi [Opens in a new window] ,
Z. K. Ma ,
Q. J. Zhu ,
J. J. Shi  and
Z. Q. Zhao
H. Y. Shi
Affiliation:
North China Institute of Science and Technology, Beijing101601, China
Z. K. Ma*
Affiliation:
School of Mining, Liaoning Technical University, Fuxin123000, China
Q. J. Zhu
Affiliation:
North China Institute of Science and Technology, Beijing101601, China
J. J. Shi
Affiliation:
North China Institute of Science and Technology, Beijing101601, China
Z. Q. Zhao
Affiliation:
College of Resources and Safety Engineering, China University of Mining and Technology (Beijing), Beijing100083, China.
*
*Corresponding author (mike110108@126.com)
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Abstract

The butterfly plastic zone theory based on Mohr Coulomb criterion has been widely used in coal mine production. In order to verify the universality of the theory, it is necessary to compare the distribution of plastic zone under different strength criteria. Based on the elastic-plastic mechanics, the principal stress distribution function around the circular tunnel is deduced in the paper, and the boundary and radius of the plastic zone under different strength criteria are calculated. The results show that the change laws of the plastic zone around the circular tunnel under different strength criteria has the following commonness: firstly, with the increase of the lateral pressure coefficient, the shape of the plastic zone presents the change laws of “circle ellipse butterfly”; Secondly, with the increase of the lateral pressure coefficient, the radius of the plastic zone is exponential distribution, while the characteristic value is different when the radius of the plastic zone is infinite. At same time, it shows that the butterfly plastic zone has a low sensitivity dependence on the strength criterion, no matter which strength criterion is adopted, and the butterfly plastic zone will inevitably appear in the surrounding rock mass of circular tunnel in the high deviator stress environment; The plastic zone with butterfly shape is highly sensitive to the stress change, and the small stress change may promote the expansion of the plastic zone. This result is significant for us to understand and prevent rock engineering disasters and accidents.

Keywords

Shape of plastic zoneCircular tunnelStrength CriterionSusceptibility
Type
Research Article
Information
Journal of Mechanics , Volume 36 , Issue 6 , December 2020 , pp. 849 - 856
Copyright
Copyright © 2020 The Society of Theoretical and Applied Mechanics

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