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Dynamic numerical simulation analysis of rockburst grade evaluation based on rock mass strength
Yalei Wang1,2, Jinming Xu3, Yan Zhang1
1School of Architectural Engineering, Xuchang Vocational Technical College, Xuchang, 461000, China.
Scientific Reports
|March 2, 2025
Summary
A new method accurately evaluates rockburst grades in tunnels by comparing rock mass strength to maximum tangential stress. This research aids in preventing rockbursts during tunnel excavation.
Area of Science:
- Geotechnical Engineering
- Rock Mechanics
- Tunnel Engineering
Background:
- Rockbursts are a significant hazard in underground excavations, influenced by stress and rock mass properties.
- Accurate rockburst grade evaluation is crucial for tunnel safety and design.
Purpose of the Study:
- To propose and validate a modified method for evaluating rockburst grades.
- To assess rockburst risk at different tunnel locations using numerical modeling.
Main Methods:
- Developed a modified rockburst grade evaluation method based on the ratio of rock mass strength to maximum tangential stress.
- Utilized FLAC3D for a three-dimensional numerical model of tunnel excavation.
- Applied the modified method to assess rockburst grades at the vault, arch waist, and arch bottom.
Main Results:
- The modified method demonstrated high accuracy, aligning well with actual rockburst observations.
- Established specific ratios of rock mass strength to maximum tangential stress for different rockburst grades (no, slight, medium, strong, violent).
- Identified increased rockburst risk within 20m of the working face and higher risk at the arch compared to the waist and bottom under horizontal stress.
Conclusions:
- The modified rockburst evaluation method is reliable for assessing tunnel safety.
- Understanding stress distribution and proximity to the working face is key to mitigating rockbursts.
- Findings offer valuable insights for rockburst prevention and control in tunnel projects.
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