A Study of Safety Coefficient Determination and Support Parameter Optimization Based on Vulnerability Preevaluation

Table 10

The scores of disturbance times from mining.

Disturbance times	1e	2e	3e					Others
Scores	2	3	4	5	6	7	8	10

“e” denotes “excavation disturbance” and “m” refers to “mining disturbance”. “1e” indicates the gateway suffering once excavation distribution, while “2e and 1m” mean the gateway suffering twice excavation distribution and once mining distribution.