Study on Catastrophe Information Characteristics of Strain-Structural Plane Slip Rockburst in Deep Tunnels
Abstract
:1. Introduction
2. A Novel 3D Discrete Element Numerical Analysis Method for Rockburst
2.1. Shortcomings of Previous Rockburst Analysis Methods
2.2. Multi-Parameter Rockburst Proneness Index Based on Energy Theory
2.3. Rockburst Simulation Analysis Method Based on the Bonded Block Model and Energy Index
3. Numerical Model and Simulation Scheme of the Strain-Structural Plane Slip Rockburst
3.1. Numerical Model and Boundary Conditions
3.2. Constitutive Model and Material Mechanical Parameters
3.3. Numerical Simulation Scheme
4. Multivariate Catastrophe Information Characteristics of the Strain-Structural Plane Slip Rockburst under Different Conditions
4.1. Characteristics of Stress Information
4.2. Characteristics of Energy Information
4.3. Characteristics of Fracture Information
4.4. Characteristics of Rockburst Proneness
5. Case Study: “11.28” Rockburst in Jinping II Drainage Tunnel
5.1. Project Overview
5.2. Model Establishment and Mechanical Parameters
5.3. Simulation Results and Analysis
6. Conclusions
- (1)
- A rockburst numerical analysis method is proposed using the bonded block model and the multi-parameter rockburst energy index. This method improves the modeling speed and calculation accuracy. It can not only simulate the fracture initiation, propagation, and interaction between blocks but also consider the various stress states of the rock unit. It realizes the visual analysis of the multivariate information response of the surrounding rock, the rockburst intensity and occurrence range, and the real simulation of the structure plane control effect on rockburst under the three-dimensional stress state.
- (2)
- As the dip angle increases, the fracture propagation range of rock mass between the tunnel and structural plane generally shows an increasing trend, the fracture width increases, and the intensity level and occurrence range of rockburst gradually decrease. As the length increases, the fracture propagation range, rockburst intensity, and occurrence range of the rock mass increase slightly. As the relative distance increases, the fracture propagation range and rockburst intensity decrease, while the occurrence range of rockburst increases first and then decreases.
- (3)
- With the increase in the surrounding rock depth, the distribution of rockburst proneness index Crs value presents a tendency of first decreasing, then increasing, and finally decreasing. The rockburst proneness in the risk area is strong-weak-sub-strong-weak and then induces a rockburst. The increasing stage of rockburst intensity is distributed near the structural plane, and its distribution characteristics are basically consistent with the characteristics of stress and energy information. The order of influence degree for the structural plane on rockburst proneness is relative distance > dip angle > length.
- (4)
- The engineering verification study was conducted on the “11.28” rockburst case in the Jinping II drainage tunnel. The peak value of rockburst index Crs between the tunnel and structural plane is greater than 40, and the larger value is distributed in a “V” shape, which is consistent with the geometric distribution of the actual rockburst pit, and the structural plane controls the boundary of the rockburst pit. The numerical analysis method for rockburst proposed in this paper can better predict and reflect the catastrophic characteristics of the strain-structural plane slip rockburst, and the case study also has verified the rationality and applicability of the method.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Crs | <19.0 | 19.0~28.0 | 28.0~40.0 | >40.0 |
---|---|---|---|---|
Rockburst intensity | No rockburst | Weak rockburst | Moderate rockburst | Intense rockburst |
Elastic Modulus (GPa) | Bulk Modulus (GPa) | Shear Modulus (GPa) | Internal Friction Angle (°) | Cohesion Force (MPa) | Tensile Strength (MPa) |
---|---|---|---|---|---|
33.57 | 20.72 | 13.64 | 53.51 | 24.67 | 7.17 |
Contact Properties | Normal Stiffness (GPa/m) | Shear Stiffness (GPa/m) | Internal Friction Angle (°) | Cohesion Force (MPa) |
---|---|---|---|---|
Fictitious joint | 70.45 | 52.20 | 53.51 | 24.67 |
Structural plane | 10 | 10 | 30 | 1 |
Condition | Geometric Parameters of Structural Plane | ||
---|---|---|---|
Dip Angle (θ) | Length (L) | Relative Distance (D) | |
a | 30 | 8.5 | 1.7 |
b | 45 | 8.5 | 1.7 |
c | 60 | 8.5 | 1.7 |
d | 45 | 6.5 | 1.7 |
e | 45 | 8.5 | 1.7 |
f | 45 | 10 | 1.7 |
g | 45 | 8.5 | 0 |
h | 45 | 8.5 | 1.7 |
i | 45 | 8.5 | 3.4 |
Density (kg/m3) | Shear Modulus (GPa) | Bulk Modulus (GPa) | Poisson Ratio | Elastic Modulus (GPa) | Cohesion Force (MPa) | Internal Friction angle (°) | Tensile Strength (MPa) |
---|---|---|---|---|---|---|---|
2780 | 7.68 | 11.66 | 0.23 | 18.90 | 15.60 | 25.80 | 6.50 |
σx/MPa | σy/MPa | σz/MPa | τxy/MPa | τyz/MPa | τxz/MPa |
---|---|---|---|---|---|
−46.42 | −51.68 | −61.48 | −2.37 | −0.64 | 3.45 |
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Guo, J.; Zhu, Z.; Zhang, H.; Sun, F.; He, B. Study on Catastrophe Information Characteristics of Strain-Structural Plane Slip Rockburst in Deep Tunnels. Appl. Sci. 2023, 13, 12396. https://doi.org/10.3390/app132212396
Guo J, Zhu Z, Zhang H, Sun F, He B. Study on Catastrophe Information Characteristics of Strain-Structural Plane Slip Rockburst in Deep Tunnels. Applied Sciences. 2023; 13(22):12396. https://doi.org/10.3390/app132212396
Chicago/Turabian StyleGuo, Jiaqi, Zihui Zhu, Hengyuan Zhang, Feiyue Sun, and Benguo He. 2023. "Study on Catastrophe Information Characteristics of Strain-Structural Plane Slip Rockburst in Deep Tunnels" Applied Sciences 13, no. 22: 12396. https://doi.org/10.3390/app132212396
APA StyleGuo, J., Zhu, Z., Zhang, H., Sun, F., & He, B. (2023). Study on Catastrophe Information Characteristics of Strain-Structural Plane Slip Rockburst in Deep Tunnels. Applied Sciences, 13(22), 12396. https://doi.org/10.3390/app132212396