Abstract
The conventional generalized Hoek–Brown failure criterion neglects the influence of intermediate principal stress, which should be considered for investigating the elastoplastic behavior of circular tunnel in rock mass. The generalized three-dimensional Hoek–Brown criterion inherits the advantages of generalized two-dimensional Hoek–Brown criterion, but also takes the intermediate principal stress into account, and is employed to be yield function in this paper. Besides, the variable critical plastic softening parameter (η*) is also introduced to investigate the elastoplastic behavior of circular tunnel excavation in rock mass. Then a new numerical procedure is proposed and verified based on GZZ failure criterion with variable η*. The radial displacement and radius of the plastic softening zone (Rp) were overestimated using the conventional Hoek–Brown failure criterions. The effect of support pressure (Pi) was underestimated at lower level on elastoplastic behavior of poor-quality rock mass compared with GZZ failure criterion with variable η*. Finally, a series of parametric studies was executed by the proposed numerical procedure about the influences of initial stress, uniaxial compression strength and GSI on Rp, and plastic softening parameter (η) and η*.
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Abbreviations
- \({\sigma }_{r}\) :
-
radial stress, MPa
- \({\sigma }_{\theta }\) :
-
tangent stress, MPa
- \({\sigma }_{z}\) :
-
axial stress, MPa
- \({\sigma }_{0}\) :
-
initial stress, MPa
- \({\sigma }_{c}\) :
-
uniaxial compression strength, MPa
- \({\tau }_{oct}\) :
-
octahedral shear stress, MPa
- \({\sigma }_{m,2}\) :
-
average stress of max and min principal stress, MPa
- \({\varepsilon }_{\theta }\) :
-
tangent strain
- \({\varepsilon }_{r}\) :
-
radial strain
- \(\eta\) :
-
plastic softening parameter
- \({\eta }^{*}\) :
-
critical plastic softening parameter
- a, m b, s :
-
strength parameters of Hoek–Brown rock mass
- \(E\) :
-
Young’s modulus, GPa
- \(\nu\) :
-
Poisson’s ratio
- \(G\) :
-
shear modulus, GPa
- \({P}_{i}\) :
-
support pressure, MPa
- \({R}_{0}\) :
-
tunnel radius, m
- \({R}_{p}\) :
-
plastic zone radius, m
- \(u\) :
-
radial displacement, mm
- \(r\) :
-
radial distance from any point to the center of the circular tunnel, m
- \(\psi\) :
-
dilation angle, °
- \(M\) :
-
drop modulus in post peak stage, GPa
- \({K}_{\psi }\) :
-
dilatancy coefficient of surrounding rock
- \(\rho\) :
-
ratio between outer and inner radii of each annulus
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Funding
This research was funded by the Shanghai Municipal Science and Technology Project (18DZ1201301; 19DZ1200900); Xiamen Road and Bridge Group (XM2017-TZ0151; XM2017-TZ0117); the project of Key Laboratory of Impact and Safety Engineering (Ningbo University), Ministry of Education (CJ202101); Shanghai Municipal Science and Technology Major Project (2021SHZDZX0100) and the Fundamental Research Funds for the Central Universities; Key Laboratory of Land Subsidence Monitoring and Prevention, Ministry of Natural Resources of the People's Republic of China (No. KLLSMP202101).
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Responsible Editor: Zeynal Abiddin Erguler
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Deng, Y., Wang, J., Jiang, M. et al. Elasto-plastic analysis of circular tunnel in rock mass with confining stress-dependent strain-softening behavior considering intermediate principal stress. Arab J Geosci 14, 2191 (2021). https://doi.org/10.1007/s12517-021-08582-2
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DOI: https://doi.org/10.1007/s12517-021-08582-2