Research on Stress Characteristics of Rockburst in Over-Length Deep-Buried Tunnel
Abstract
:1. Introduction
2. Project Overview
3. Rockburst Characteristics of Ping’an Tunnel
4. Model Establishment of Rockburst Sections in Ping’an Tunnel
4.1. In Situ Stress Test during Construction
4.2. Establishment of Three-Dimensional Model
5. Stress Analysis of Rockburst Section of Ping’an Tunnel
5.1. Stress Field Analysis of Rockburst Section in Ping’an Tunnel’s Left Line
5.2. Stress Field Analysis of Rockburst Section in Ping’an Tunnel’s Right Line
6. Rockburst Conditions of Different Positions in Ping’an Tunnel
7. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Line | Slight Rockburst (m) | Medium Rockburst (m) | Strong Rockburst (m) | Total (m) |
---|---|---|---|---|
The left line of Ping’an Tunnel | 495 | 1310 | 510 | 2315 |
The right line of Ping’an Tunnel | 457 | 1510 | 693 | 2560 |
Total | 952 | 2820 | 1203 | 4875 |
Location | In Situ Stress Parameter | Maximum Principal Stress σ1 | Intermediate Principal Stress σ2 | Minimum Principal Stress σ3 |
---|---|---|---|---|
D8K171+760 of Ping’an Tunnel | Stress value/MPa | 31.519 | 23.128 | 15.172 |
Direction/° | NW194.688° | NW102.609° | NE63.848° | |
Dip angle/° | ∠4.922° | ∠22.842° | ∠66.575° |
Section | Volumetric Weight (kN/m3) | Cohesion (MPa) | Friction Angle (°) | Poisson’s Ratio | Elasticity Modulus (GPa) |
---|---|---|---|---|---|
Surrounding rock | 24.0 | 1.51 | 38.0 | 0.28 | 48.0 |
Initial support | 24.5 | 1.64 | 33.7 | 0.16 | 30.0 |
The second line | 24.5 | \ | \ | 0.20 | 33.5 |
Lithology | Density (g/cm3) | Cohesion (MPa) | Frictional Angle (°) | Poisson’s Ratio | Elasticity Modulus (GPa) | (MPa) |
---|---|---|---|---|---|---|
Sandstone | 2.4 | 1.5 | 38 | 0.28 | 48 | 132.05 |
Location | Maximum Principal Stress (MPa) | Criterion of Rockburst | Rockburst Rating on Site |
---|---|---|---|
Vault of the left tunnel | 32.63 | 4.05 (slight rockburst) | slight rockburst |
Arch of the left tunnel | 32.76 | 4.03 (slight rockburst) | slight rockburst |
Side wall of the left tunnel | 34.89 | 3.78 (medium rockburst) | medium rockburst |
Middle of the left tunnel | 17.34 | 7.61 (no rockburst) | medium rockburst |
Vault of the right tunnel | 34.11 | 3.87 (medium rockburst) | medium rockburst |
Arch of the right tunnel | 32.86 | 4.01 (slight rockburst) | slight rockburst |
Side wall of the right tunnel | 34.52 | 3.83 (medium rockburst) | medium rockburst |
Middle of the right tunnel | 17.28 | 7.64 (no rockburst) | medium rockburst |
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Luo, C.; Zhang, S.; Tang, B.; Chen, J.; Yin, C.; Li, H. Research on Stress Characteristics of Rockburst in Over-Length Deep-Buried Tunnel. Buildings 2024, 14, 2298. https://doi.org/10.3390/buildings14082298
Luo C, Zhang S, Tang B, Chen J, Yin C, Li H. Research on Stress Characteristics of Rockburst in Over-Length Deep-Buried Tunnel. Buildings. 2024; 14(8):2298. https://doi.org/10.3390/buildings14082298
Chicago/Turabian StyleLuo, Chun, Shishu Zhang, Bihua Tang, Jun Chen, Chonglin Yin, and Huayun Li. 2024. "Research on Stress Characteristics of Rockburst in Over-Length Deep-Buried Tunnel" Buildings 14, no. 8: 2298. https://doi.org/10.3390/buildings14082298