Experimental and Numerical Investigations on the Mechanical Behavior of Basalt in the Dam Foundation of the Baihetan Hydropower Station
Publication: International Journal of Geomechanics
Volume 22, Issue 2
Abstract
The mechanical behavior of basalt is critical to the stability and safety of large structures erected on basalt. In this paper, a series of tests (hydrostatic compression test, triaxial compression tests, and triaxial cyclic loading test) are conducted on basalt specimens from the Baihetan hydropower station in southwest China. The test results show that the crack closure (σcc), crack initiation (σci), and crack damage (σcd) stresses are approximately 39%–43%, 54%–68%, and 74%–96% of the peak strength (σp), respectively. Based on the experimental results, a coupled elastoplastic damage model is proposed for basalt within a thermodynamic framework. In this model, elastic stiffness is affected by induced damage. Linear yield function and nonassociated flow rule are used to control inelastic dilatancy. Model parameters are determined from the triaxial compression tests and triaxial loading tests performed in this study. Comparison between numerical results and test results shows that the proposed model can accurately simulate the mechanical behavior of basalt under triaxial compression conditions.
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Acknowledgments
This research is supported by the National Key R&D Program of China (Grant No. 2018YFC0407004), and the Natural Science Foundation of China (Grant Nos. 51939004, 11772118) is gratefully acknowledged.
Notation
The following symbols are used in this paper:
- D
- elastic stiffness matrix tensor;
- dɛp
- plastic strain increment tensor;
- damage multiplier;
- dλp
- plastic multiplier;
- elastic modulus of damaged basalt;
- E0
- elastic modulus of undamaged basalt;
- fp
- plastic yield function;
- damage yield function;
- gp
- plastic potential function;
- damage potential function;
- Drucker–Prager strength parameter;
- p
- mean stress;
- q
- deviatoric stress;
- v
- Poisson's ratio;
- thermodynamic force;
- αp
- plastic hardening/softening function;
- Drucker–Prager strength parameter;
- related to the shear-volumetric dilation;
- β
- plastic-hardening rate;
- damage evolution rate;
- χ
- plasticity–damage coupling parameter;
- δij
- Kronecker delta;
- ɛ
- strain tensor;
- ɛp
- plastic strain tensor;
- ɛe
- elastic strain tensor;
- γp
- plastic shear strain;
- κ
- damage parameter;
- θ
- Lode angle;
- σ
- stress tensor;
- σcc
- crack closure stress;
- σcd
- crack damage stress;
- σci
- crack initiation stress;
- σp
- peak strength;
- ψ
- thermodynamic potential; and
- ω
- damage variable.
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Published In
International Journal of Geomechanics
Volume 22 • Issue 2 • February 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Feb 4, 2021
Accepted: Oct 11, 2021
Published online: Dec 1, 2021
Published in print: Feb 1, 2022
Discussion open until: May 1, 2022
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