Abstract
During the operation of the Jinping II hydropower station, the rocks surrounding the headrace tunnels have undergone failure because of the time-dependent creep effect that occurs due to the high geostress present and seepage. However, a few studies of the creep deformation of deep rocks have taken into account the coupling effect between excavation damage and pore pressure. This paper reports the results of a series of triaxial creep experiments conducted on Jinping deep marble in which the coupling between excavation damage and high pore pressure was studied. The results show that the magnitude of the creep deformation, the long-term strength, and failure mode of the excavation-damaged marble vary considerably with pore pressure. That is, the pore pressure has a significant effect on the marble. A new nonlinear viscoelastic-plastic damage (VEPD) model incorporating the effect of pore pressure was subsequently developed based on the experimental data. The values of the parameters appearing in the model were then obtained using a method of Universal Global Optimization. Good consistency is found between our theoretical predictions and test data which indicates that the VEPD model can be reliably used to simulate and predict the complete creep process in excavation-damaged deep rocks. It also gives a good account of the effect of pore pressure on the creep behavior. As a result, the model provides us with a better understanding of the long-term stability of underground engineering projects.
Highlights
-
The coupling between excavation damage and high pore pressure was investigated during creep deformation of deep marble.
-
The time-dependent behavior and mechanism of excavation-damaged marble subjected to various pore pressures were analyzed.
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A new creep model that is applicable to excavation-damaged deep marble was proposed.
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Abbreviations
- \(\alpha\) :
-
Material constant
- \(\beta\) :
-
Material constant
- \(b\) :
-
Material constant
- \(\tilde{c}\) :
-
The effective cohesive strength of the rock
- \(d\) :
-
Material constant
- \(D\) :
-
Creep damage factor
- \(\varepsilon_{{{\text{ij}}}}\) :
-
Total strain
- \(\varepsilon_{ij}^{{\text{e}}}\) :
-
The strain component of the Hooke element in 3D
- \(\varepsilon_{ij}^{{{\text{ve}}}}\) :
-
The strain component of the modified Kelvin element in 3D
- \(\varepsilon_{ij}^{{{\text{vp}}}}\) :
-
The strain component of the nonlinear viscoplastic element in 3D
- \(E^{{\text{H}}}\) :
-
Elasticity parameter of the Hooke element
- \(E^{{\text{K}}}\) :
-
Elasticity parameter of the modified Kelvin element
- \(\eta^{{{\text{ve}}}}\) :
-
Viscosity coefficient of the modified Kelvin element
- \(\eta^{{{\text{vp}}}}\) :
-
Viscosity coefficient of the nonlinear viscoplastic element
- \(F\) :
-
Yield function
- \(\tilde{\varphi }\) :
-
The effective friction angle of the rock
- \(g\) :
-
Plastic potential function
- \(G^{{\text{K}}}\) :
-
The shear modulus of the modified Kelvin element
- \(G^{{\text{H}}}\) :
-
The shear modulus of the Hooke element
- \(\gamma\) :
-
The bulk density of the rock
- \(H\) :
-
The burial depth of the rock
- \(H^{ * }\) :
-
Step function
- \(K^{{\text{H}}}\) :
-
The bulk modulus of the Hooke element
- \(m\) :
-
Material constant
- \(\lambda\) :
-
Material parameter controlled by the stress level
- \(\varpi\) :
-
Material constant
- \(\kappa\) :
-
Lateral pressure coefficient
- \(\varsigma\) :
-
Stress concentration coefficient
- \(P_{{\text{w}}}\) :
-
Pore pressure
- \(\tilde{S}_{ij}\) :
-
The effective deviatoric stress tensor
- \(t\) :
-
Creep time
- \(\sigma_{ij}\) :
-
Total stress tensor
- \(\tilde{\sigma }_{ij}\) :
-
The effective stress tensor
- \(\tilde{\sigma }_{{\text{m}}}\) :
-
The effective spherical stress tensor
- \(\tilde{\sigma }_{t}\) :
-
The effective tensile strength of the rock
- \(\tilde{\sigma }_{ij}^{{\text{e}}}\) :
-
The effective stress tensor of the Hooke component
- \(\tilde{\sigma }_{ij}^{{{\text{ve}}}}\) :
-
The effective stress tensor of the modified Kelvin component
- \(\tilde{\sigma }_{ij}^{{{\text{vp}}}}\) :
-
The effective stress tensor of the nonlinear viscoplastic component
- \(\sigma_{{\text{s}}}\) :
-
The creep yield strength subjected to a certain stress state
- \(\sigma_{{\text{s}}}^{{\text{P}}}\) :
-
The creep yield strength subjected to the coupling between a certain stress and pore pressure
- \(\delta_{ij}\) :
-
Kronecker delta function
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Acknowledgements
The authors gratefully acknowledge financial support for this work from the National Natural Science Foundation of China (Grant nos. 51879261, U1765206, and 52125903) and the innovation group project of the Natural Science Foundation of Hubei Province (ZRQT2020000114).
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Huang, X., Li, S., Xu, D. et al. Time-Dependent Behavior of Jinping Deep Marble Taking into Account the Coupling Between Excavation Damage and High Pore Pressure. Rock Mech Rock Eng 55, 4893–4912 (2022). https://doi.org/10.1007/s00603-022-02912-w
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DOI: https://doi.org/10.1007/s00603-022-02912-w