Journals
Publish with us
Publishing partnerships
About us
Blog
Shock and Vibration
Journal overview
For authors
For reviewers
For editors
Table of Contents
Special Issues
Shock and Vibration
/
2021
/
Article
/
Tab 21
/
Research Article
A Study of Safety Coefficient Determination and Support Parameter Optimization Based on Vulnerability Preevaluation
Table 21
Classification standard for vulnerability of surrounding rock and safety coefficient.
Score
Vulnerability levels
I
II
III
IV
V
Safety coefficient
3.3
3.3∼4
4∼4.7
4.7∼5.4
>5.4