Prediction Method of TBM Tunneling Parameters Based on Bi-GRU-ATT Model

Table 2

Comparison of evaluation indexes of prediction results among different recurrent neural network models.

Model	Parameter
Bi-GRU-ATT	Total thrust	1.01	0.925	151.52	193.62
	Penetration	1.60	0.930	0.15	0.20
	Cutterhead torque	1.40	0.936	31.30	44.44
	Cutterhead power	1.71	0.944	34.13	34.75
Bi-GRU	Total thrust	1.11	0.915	146.35	184.23
	Penetration	2.05	0.898	0.20	0.26
	Cutterhead torque	1.84	0.909	52.65	67.00
	Cutterhead power	2.13	0.884	38.30	46.02
GRU	Total thrust	1.21	0.859	196.68	280.99
	Penetration	2.47	0.867	0.23	0.27
	Cutterhead torque	2.26	0.879	60.87	73.37
	Cutterhead power	2.52	0.870	48.41	50.95
LSTM	Total thrust	1.44	0.870	205.60	252.02
	Penetration	2.97	0.840	0.27	0.32
	Cutterhead torque	2.04	0.889	55.88	67.97
	Cutterhead power	2.7	0.860	44.61	52.89