Abstract
Numerical simulation is a commonly used method for investigating rock failure. However, the numerical model is usually insufficient to predict real rock damage and failure because of rock microstructural heterogeneity. In fact, rock damage can be quantified using acoustic emission (AE) data. The aim of this study is to simulate and predict the failure of Brazilian and uniaxial compression specimens using AE data recorded during experiments. An AE data-driven model, in which cracks are assumed to be tensile in nature, is developed. AE data recorded from the test start up to a fraction of the peak stress (e.g., 20%, 40%, and 60%) are input into the data-driven model to predict the evolution of failure pattern beyond that stress level up to failure. First, we quantified stress-induced rock damage with AE data based on the tensile model. The results indicate that most of damage source radii are less than one millimeter, and the corresponding damage degree is close to one. Then, the inversed damage is input as the initial conditions for the numerical simulation to predict the future damage and failure of rock. With the increase of damage elements driven by AE data, the inversed damage zone develops from diffuse to localized, and the dominant factor for rock failure transits from microstructural heterogeneity into stress-induced rock damage. The damage and failure pattern of rock is well predicted when sufficient AE data are taken into account as known conditions.
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Abbreviations
- C ap :
-
Akaike information criterion
- n :
-
Total number of time data
- σ21 , σ22 , l1 and l2 :
-
Variances and degrees of the auto-regression model
- T mi :
-
Measured arrival time at the ith sensor
- E i :
-
Internal energy
- E d :
-
Dissipated energy
- σ n :
-
Stress normal to the crack
- E :
-
Young’s modulus of rock
- γ :
-
Specific surface energy
- L :
-
Length of the propagation path
- V P :
-
P-wave velocity
- \(\left\langle {R_{\text{P}} } \right\rangle\) :
-
Averaged value of radiation pattern coefficient
- v(t):
-
Particle velocity waveform
- t :
-
Time
- u(t):
-
AE voltage waveform
- D :
-
Damage variable
- ui (i = x, y, and z):
-
Displacement in the i direction
- F i :
-
Component of the net body force in the i direction
- σ 1 :
-
Maximum principal stress
- lg:
-
Base-10 logarithm symbol
- k :
-
kth number of time data
- E r :
-
Estimate of the error
- T ci :
-
Calculated arrival time at the ith sensor
- E a :
-
Surface energy
- E k :
-
Kinetic energy
- a :
-
Crack half-length
- ν :
-
Poisson’s ratio of rock
- K IC :
-
Mode I fracture toughness
- ρ :
-
Rock density
- R P :
-
Coefficient of the radiation pattern at each sensor
- C v :
-
Correction term of the volumetric component
- t d :
-
Source duration
- M :
-
Moment tensor
- S coef :
-
Sensitivity coefficient
- E 0 :
-
Elastic moduli of undamaged material
- G :
-
Shear modulus
- f t0 :
-
Uniaxial tensile strength
- σ 3 :
-
Minimum principal stress
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Acknowledgements
We would like to thank three anonymous reviewers and the Editor for their helpful comments and suggestions that have greatly improved this paper. We also would like to thank Rufei Li, Feng Dai, and Long Zhao for their technical support and Leilei Niu, Penghai Zhang, and Feiyue Liu for their fruitful discussions. This work is funded by the National Key Research and Development Program of China (Grant no. 2016YFC0801607), National Science Foundation of China (Grant nos. 51525402, 51874069, and 51874069), Fundamental Research Funds for the Central Universities of China (Grant nos. N170108028 and N180115009), Korea Institute of Energy Technology Evaluation and Planning (KETEP) and Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (no. 20172510102340), and the Brain Korea 21 Plus Program (no. 21A20130012821). These supports are gratefully acknowledged.
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Wei, J., Zhu, W., Guan, K. et al. An Acoustic Emission Data-Driven Model to Simulate Rock Failure Process. Rock Mech Rock Eng 53, 1605–1621 (2020). https://doi.org/10.1007/s00603-019-01994-3
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DOI: https://doi.org/10.1007/s00603-019-01994-3