Classification Prediction of Rockburst in Railway Tunnel Based on Hybrid PSO-BP Neural Network

Table 2

Actual rating and indicator data of tunnel to be predicted.

Sample number	Rock type	Buried depth/m				Actual grade
Q-1	Limestone	498	0.325	9.23	1.968	II
Q-2	Limestone	403	0.468	9.68	3.865	III
Q-3	Basalt	695	0.523	14.36	4.325	III
Q-4	Limestone	640	0.576	11.85	2.325	II
Q-5	Limestone	640	0.765	16.85	3.236	III