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

Table 2

Orthogonal test table.

Factor	Elastic modulus	Cohesion force	Internal friction angle	Permeability parameters	A	n	Subsidence value of point B	A vault displacement value	Subsidence value of point C	Displacement value of arch bottom	Horizontal convergence value
	E (GPa)	c (MPa)	ϕ (°)	K (10^−7m/s)	10^–21		mm	mm	mm	mm	mm
1	30	2.5	26	2	2	2	6.69	7.89	6.69	2.12	0.18
2	30	2.7	27	4	2.5	2.5	8.87	10.49	8.87	2.77	0.46
3	30	2.9	28	6	3	0.5	6.48	7.65	6.48	2.14	0.19
4	30	3.1	29	8	3.5	1	6.44	7.6	6.44	2.16	0.18
5	30	3.3	30	10	4	1.5	6.4	7.57	6.4	2.17	0.18
6	35	2.5	27	6	3.5	1.5	5.72	6.74	5.72	1.77	0.17
7	35	2.7	28	8	4	2	5.68	6.69	5.67	1.81	0.18
8	35	2.9	29	10	2	2.5	7.57	8.96	7.57	2.36	0.4
9	35	3.1	30	2	2.5	0.5	5.54	6.54	5.54	1.85	0.16
10	35	3.3	26	4	3	1	5.53	6.54	5.53	1.84	0.15
11	40	2.5	28	10	2.5	1	5.01	5.9	5.01	1.54	0.15
12	40	2.7	29	2	3	1.5	4.94	5.82	4.94	1.58	0.15
13	40	2.9	30	4	3.5	2	4.93	5.81	4.93	1.6	0.15
14	40	3.1	26	6	4	2.5	8.54	10.12	8.54	2.56	0.59
15	40	3.3	27	8	2	0.5	4.86	5.74	4.85	1.61	0.13
16	45	2.5	29	4	4	0.5	4.46	5.25	4.46	1.37	0.14
17	45	2.7	30	6	2	1	4.39	5.17	4.39	1.39	0.14
18	45	2.9	26	8	2.5	1.5	4.38	5.16	4.38	1.39	0.15
19	45	3.1	27	10	3	2	4.37	5.16	4.37	1.41	0.13
20	45	3.3	28	2	3.5	2.5	7.66	9.09	7.66	2.28	0.52
21	50	2.5	30	8	3	2.5	7.04	8.34	7.04	2.03	0.5
22	50	2.7	26	10	3.5	0.5	4	4.7	4	1.23	0.12
23	50	2.9	27	2	4	1	3.95	4.67	3.95	1.26	0.12
24	50	3.1	28	4	2	1.5	3.91	4.61	3.91	1.26	0.12
25	50	3.3	29	6	2.5	2	3.91	4.63	3.91	1.28	0.12