Multiparameter Inversion Early Warning System of Tunnel Stress-Seepage Coupling Based on IA-BP Algorithm

Table 7

Comparisons between calculated experimental values and IA-BP inversion results.

Experimental factors	Calculated test value				IA-BP algorithm inversion value
	E (GPa)	c (MPa)	μ	φ (°)	E (GPa)	c (MPa)	μ	φ (°)
Test 1	40	0.4	0.2	20	40.000	0.400	0.000	20.000
Test 2	40	0.6	0.25	22	40.000	0.599	0.250	21.999
Test 3	40	0.8	0.3	24	41.248	0.800	0.294	24.000
Test 4	45	0.4	0.25	24	45.000	0.400	0.250	23.999
Test 5	45	0.6	0.3	20	44.999	0.601	0.300	20.001
Test 6	45	0.8	0.2	22	45.001	0.799	0.201	24.000
Test 7	50	0.4	0.3	22	49.999	0.400	0.300	20.000
Test 8	50	0.6	0.2	24	50.000	0.600	0.200	24.000
Test 9	50	0.8	0.25	20	50.000	0.799	0.000	24.000