Abstract
Deep underground rock tunnels and caverns in mountainous areas are often subjected to the coupling impacts of high geo-stresses and high-ground temperature that can threaten the stability of rock masses. This paper presents an experimental study of strength, deformation, and failure as well as energy evolution characteristics for rockburst potential evaluation of granite under the influence of coupled high confining pressure and ground temperature using a series of triaxial compression tests with samples drilled from a borehole about 1000 m in the depth of a mountain tunnel in Tibet area. Three representative confining pressures (20, 40, and 60 MPa) and four typical temperatures (30, 60, 90, and 120 ℃) around the engineering range were inspected according to the previous tunnel site investigations. The strength and deformability of the granite samples were analyzed under the influence of coupled high confining pressure and temperature. An energy storage index is introduced to discuss rockburst potential of the granite under thermal–mechanical coupled conditions. It is found that high-ground temperature leads to degradation of mechanical properties of the granite samples, while high pressure increases its strength and deformability. In addition, the high pressure and ground temperature couplings increase both the energy storage capacity and rockburst potential, with 60–90 ℃ being the strengthening range. The findings are beneficial to understanding the behavior of surrounding rock masses, the evaluation of its stability, and rockburst potential for deep underground tunnels in areas with high in-situ stress and ground temperature.
Highlights
-
Mechanical and energy evolution behaviors of granite were reported under thermal-mechanical coupled conditions.
-
Rockburst potential of granite under thermal-mechanical coupled conditions was evaluated by an energy index.
-
Granite strength decreased with increasing temperature with 60–90 ℃ being the strengthening range of rock potential.
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Abbreviations
- \(m_{0}\) :
-
Mass
- D, \(L\) :
-
Diameter and length of the sample
- \(\rho_{0}\) :
-
Density of sample
- \(V_{P}\) :
-
P-wave velocity in the natural state
- \(\sigma_{3}\),\(P_{C}\) :
-
Minimum principal stress, confining pressure
- \(q\),\(\sigma_{1} - \sigma_{3}\) :
-
Deviatoric stress
- \(q_{T}\) :
-
Peak strength of the deviatoric stress at temperature T
- \(E\) :
-
Elastic modulus
- \(E_{L}\) :
-
Loading modulus
- \(E_{U}\) :
-
Unloading modulus
- \(\varepsilon_{1}\) :
-
Axial strain
- \(\varepsilon_{1}^{{{\text{peak}}}}\) :
-
Axial peak strain
- \(\varepsilon_{3}\) :
-
Radial strain
- \(\varepsilon_{{\text{v}}}\) :
-
Volumetric strain
- \(T\) :
-
Temperature
- \(c\) :
-
Cohesion
- \(\varphi\) :
-
Internal friction angle
- \(\tau\) :
-
Shear stress
- \(\sigma_{{\text{n}}}\) :
-
Normal stress
- \(U^{0}\) :
-
Total energy absorbed by the rock
- \(U^{{\text{d}}}\) :
-
Energy dissipated by the rock during loading
- \(U^{{\text{e}}}\) :
-
Elastic energy accumulated in the rock
- \(W_{{{\text{et}}}}\) :
-
Elastic deformation energy index
- \(\delta\) :
-
Energy storage capacity index
- \(\eta\) :
-
Strength degradation coefficient caused by temperature
- \(\Psi ,\xi ,{\rm K},\alpha\) :
-
Material parameters
- \(\lambda ,\beta\) :
-
Fitting coefficients
- \(\omega\) :
-
Failure angle
- UCS:
-
Uniaxial compressive strength
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Acknowledgements
Supports from the National RD Program of China (no.2021YFB2301304) and Natural Science Foundation of China (52278333), and the Research Project of China Railway First Survey and Design Institute Group Co., Ltd (no.19-15 and no.20-17-1) are acknowledged. The work is partially supported by the 111 Project (B17009) and under the framework of the Sino-Franco Joint Research Laboratory on Multiphysics and Multiscale Rock mechanics.
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Liu, Z., Wang, H., Li, Y. et al. Triaxial Compressive Strength, Failure, and Rockburst Potential of Granite Under High-Stress and Ground-Temperature Coupled Conditions. Rock Mech Rock Eng 56, 911–932 (2023). https://doi.org/10.1007/s00603-022-03066-5
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DOI: https://doi.org/10.1007/s00603-022-03066-5