Study on the Safety Thickness of Rock Strata for Outburst Prevention in Deep Tunnel Based on Numerical Modeling and Backpropagation Neural Network

Table 11

Simulated and theoretical values of minimum safe thickness under the condition of flexural strength.

Simulated safe thickness (m)	7.14	6.87	6.84	6.84	7.10
Theoretical safe thickness (m)	6.83	6.86	6.88	6.94	6.91
Error (%)	4.54	0.15	0.58	1.46	2.75