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

Table 3

Comparison of test values with the IA-BP algorithm.

Factor	Calculated test value					IA-BP algorithm learning value
	Elastic modulus	Cohesion force	Internal friction angle	Permeability parameters	A	n	Elastic modulus	Cohesion force	Internal friction angle	Permeability parameters	A	n
	E (GPa)	c (MPa)	ϕ (°)	K (10^−7 m/s)	10^–21		E (GPa)	c (MPa)	ϕ (°)	K (10^−7 m/s)	10^–21
1	30	2.5	26	2	2	2	30.000	3.300	26.000	3.434	4.000	0.500
2	30	2.7	27	4	2.5	2.5	30.000	2.698	27.053	4.571	2.509	2.500
3	30	2.9	28	6	3	0.5	30.029	3.300	26.000	4.995	4.000	0.500
4	30	3.1	29	8	3.5	1	30.115	3.103	28.971	8.216	4.000	1.109
5	30	3.3	30	10	4	1.5	30.000	3.300	30.000	2.000	4.000	0.501
6	35	2.5	27	6	3.5	1.5	35.011	2.556	26.966	6.609	3.485	1.789
7	35	2.7	28	8	4	2	34.838	2.679	28.084	6.943	4.000	1.520
8	35	2.9	29	10	2	2.5	35.013	2.900	30.000	9.770	2.017	2.500
9	35	3.1	30	2	2.5	0.5	35.000	3.300	30.000	3.000	2.499	0.529
10	35	3.3	26	4	3	1	35.033	3.300	26.000	3.463	2.992	0.500
11	40	2.5	28	10	2.5	1	40.585	2.768	29.972	6.576	2.248	1.712
12	40	2.7	29	2	3	1.5	40.941	2.608	29.992	6.628	2.967	1.770
13	40	2.9	30	4	3.5	2	40.831	2.932	30.000	6.609	3.482	1.796
14	40	3.1	26	6	4	2.5	40.037	3.101	26.033	5.278	4.000	2.500
15	40	3.3	27	8	2	0.5	40.007	3.300	26.992	5.930	2.160	0.695
16	45	2.5	29	4	4	0.5	45.857	2.795	26.000	6.522	2.685	1.149
17	45	2.7	30	6	2	1	42.669	2.795	29.603	6.566	2.320	1.578
18	45	2.9	26	8	2.5	1.5	46.84	2.813	26.219	6.546	2.498	1.396
19	45	3.1	27	10	3	2	44.693	3.051	27.028	6.522	2.328	1.410
20	45	3.3	28	2	3.5	2.5	50.000	3.300	28.005	2.038	3.503	2.466
21	50	2.5	30	8	3	2.5	50.000	2.508	30.000	8.439	3.001	2.500
22	50	2.7	26	10	3.5	0.5	48.837	2.763	26.000	6.457	3.579	0.695
23	50	2.9	27	2	4	1	50.000	2.899	26.000	2.798	4.000	0.500
24	50	3.1	28	4	2	1.5	49.999	3.086	28.027	6.502	2.329	1.534
25	50	3.3	29	6	2.5	2	50.000	3.300	28.993	6.092	2.472	2.003