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

Table 5

Comparison of actual and predicted values of ZL2-7.

Period		13	14	15
Actual value		2350.88	2342.03	2455.03
GM (1, 1)	Predicted value	2413.68	2536.72	2666.03
	Relative error (%)	−2.67	−8.31	−8.59
PSO-GM (1, 1)	Predicted value	2390.73	2476.32	2579.31
	Relative error (%)	−1.69	−5.73	−5.06