Abstract
Uniaxial/triaxial compression and scanning/backscattered electron microscopy (SEM/BSEM) tests have been conducted in this study to explore the hydro-mechanical (H-M) response and failure mechanism of basalt from Baihetan hydropower station in China. The experimental findings show that the characteristic strengths, deformation behavior, and failure modes of basalt are greatly influenced by confining and pore pressures. Observations from SEM/BSEM tests reveal that the failure mode is due to the development and growth of intergranular/transgranular microcracks. Under H-M loading conditions, the permeability evolution of basalt exhibits nonlinear and distinct characteristics. Additionally, the permeability evolution and failure mode of basalt under the influence of both confining and pore pressures have been discussed. To further describe the H-M response of rocks under loading, continuum damage mechanics theory, in conjunction with strain equivalence and effective stress principles, has been used to establish an entropy distribution-based probabilistic damage constitutive model. To validate the model, the theoretical results have been compared with those obtained from experiments for basalt and other quasi-brittle rock-like materials. The outcome of this study has implications for the engineering design and safety evaluation for structures that lie within rock masses vulnerable to H-M coupling disasters.
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Abbreviations
- A and L :
-
Cross-sectional area and length of rock samples, respectively
- c :
-
Cohesion
- E :
-
Elastic modulus
- \({{\tilde E}^\prime }\) :
-
Elastic modulus of the undamaged segment of materials
- F :
-
Mohr-Coulomb failure criterion or extent of meso-element strength
- k :
-
Permeability
- k 0 :
-
Initial permeability
- k 1 :
-
Minimum permeability
- k p :
-
Peak permeability
- m :
-
Highest order of moments
- N and N f :
-
Total and failed quantities of meso-element units, respectively
- p and q :
-
Rock material constants
- P(F):
-
Probability density function
- p p :
-
Pore pressure
- p(x) and P(x) or H(x):
-
Discrete and continuous probability density functions, respectively
- Q :
-
Fluid-flow rate
- S(x):
-
Information entropy
- u i (i=0, 1, 2,…, m):
-
Moment function
- υ :
-
Poisson’s ratio
- \({{\tilde v}^\prime }\) :
-
Poisson’s ratio of the undamaged segment of materials
- x :
-
Random variable
- (i, j, k):
-
(1, 2, 3) (2, 3, 1) or (3, 1, 2)
- β :
-
Biot’s effective stress coefficient
- ΔP :
-
Fluid pressure difference
- δ ij :
-
Kronecker product coefficient
- ε 1, ε 2, and ε 3 :
-
Axial, intermediate principal, and lateral strains, respectively
- ε 1t :
-
Measured differential strain
- ε 10 :
-
Initial strain
- ε cv :
-
Crack volumetric strain
- ε ev :
-
Elastic volumetric strain
- ε v :
-
Volumetric strain
- \(\tilde \varepsilon _i^\prime \,(i = 1,\,\,2,\,\,3)\) :
-
Effective strain of the undamaged segment of materials
- ϕ :
-
Damage variable
- η :
-
Dynamic water viscosity
- φ :
-
Internal friction angle
- λ i (i=0, 1, 2,…, m):
-
Lagrangian multipliers
- μi (i=0, 1, 2,…, m):
-
Moment constant
- σ 1, σ 2, σ 3 :
-
Axial, intermediate principal, confining stresses, respectively
- (σ 1–σ 3) or σ 1t :
-
Deviatoric stress
- σ cc :
-
Closure stress
- σ ci :
-
Initiation stress
- σ cd :
-
Damage stress
- σ p :
-
Peak stress
- \(\tilde \sigma _1^\prime \) :
-
Effective differential stress
- \(\tilde \sigma _3^\prime \) :
-
Effective confining pressure
- \(\tilde \sigma _c^\prime \) :
-
Uniaxial compression strength
- \(\sigma _i^\prime \,(i = 1,2,3)\) and \(\tilde \sigma _i^\prime \,(i = 1,2,3)\) :
-
Macroscopic stress and effective stress in the undamaged segment, respectively
- ξ and ψ :
-
Permeability fitting constants
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Acknowledgments
The authors acknowledge the financial support provided by the Major Science and Technology Special Projects in Yunnan Province (Grant No. 202102AF080001).
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Abubakar, A.F., Wang, H. & Wu, Y. Investigation of the Hydro-mechanical Response and Entropy-based Probabilistic Damage Constitutive Model of Basalt under Compression. KSCE J Civ Eng (2024). https://doi.org/10.1007/s12205-024-1874-x
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DOI: https://doi.org/10.1007/s12205-024-1874-x