Research on Deformation Prediction of Foundation Pit Based on PSO-GM-BP Model

Table 12

B16 actual value and model fitting value results.

Period	Actual value	BP network		PSO-BP network
		Fitting value	Relative error (%)	Fitting value	Relative error (%)
1	21.66	21.6528	−0.03	21.6594	0.00
2	23.30	23.2941	−0.02	23.2997	0.00
3	23.90	23.8606	−0.16	23.8993	0.00
4	23.25	23.2772	0.12	23.2501	0.00
5	24.50	24.4945	−0.02	24.4982	−0.01
6	25.31	25.3054	−0.02	25.3095	0.00
7	27.95	27.9457	−0.01	27.9483	−0.01
8	29.04	29.0528	0.04	29.0400	0.00
9	28.23	28.2108	−0.07	28.2220	−0.03
10	29.44	29.4375	−0.01	29.4683	0.10
11	30.38	30.3777	−0.01	30.3346	−0.15
12	30.81	30.8088	−0.00	30.8323	0.07