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

Table 3

Actual value and model fitting value of ZL2-7.

Period	Actual value	GM (1, 1)		PSO-GM (1, 1)
		Fitting value	Relative error (%)	Fitting value	Relative error (%)
1	1091.74	1091.74	0	1022.855	−6.30
2	1227.01	1396.89	−13.85	1397.199	−13.82
3	1343.88	1468.10	−9.24	1469.021	−9.31
4	1578.08	1542.94	−2.23	1544.535	−2.12
5	1757.89	1621.59	−7.75	1623.931	−7.62
6	1822.97	1704.25	−6.51	1707.408	−6.33
7	1828.44	1791.12	−2.04	1795.176	−1.81
8	1908.81	1882.42	−1.38	1887.456	−1.11
9	2061.54	1978.38	−4.03	1984.479	−3.73
10	2025.6	2079.23	−2.65	2086.49	−3.00
11	2151.51	2185.22	−1.57	2193.745	−1.96
12	2221.34	2296.61	−3.39	2306.513	−3.83