In Situ Stress Inversion and Distribution Characteristics of Tunnel Based on Numerical Simulation and Neural Network Technology

Table 3

Sum of errors between numerical simulation and measurement under different numerical simulation experimental schemes.

Factor	k	a	b	c			The absolute value
Experiment 1	0.1	0.1	0.1	0.1	0.1	0.001	112.468
Experiment 2	0.1	0.5	0.5	0.5	0.5	0.005	85.478
Experiment 3	0.1	0.9	0.9	0.9	0.9	0.009	60.636
Experiment 4	0.1	1.3	1.3	1.3	1.3	0.013	386.995
Experiment 5	0.1	1.7	1.7	1.7	1.7	0.017	416.205
Experiment 6	0.5	0.1	0.5	0.9	1.3	0.017	33.385
Experiment 7	0.5	0.5	0.9	1.3	1.7	0.001	5.492
Experiment 8	0.5	0.9	1.3	1.7	0.1	0.005	10.358
Experiment 9	0.5	1.3	1.7	0.1	0.5	0.009	59.415
Experiment 10	0.5	1.7	0.1	0.5	0.9	0.013	38.122
Experiment 11	0.9	0.1	0.9	1.7	0.5	0.013	128.066
Experiment 12	0.9	0.5	1.3	0.1	0.9	0.017	144.647
Experiment 13	0.9	0.9	1.7	0.5	1.3	0.001	87.695
Experiment 14	0.9	1.3	0.1	0.9	1.7	0.005	171.750
Experiment 15	0.9	1.7	0.5	1.3	0.1	0.009	101.702
Experiment 16	1.3	0.1	1.3	0.5	1.7	0.009	186.289
Experiment 17	1.3	0.5	1.7	0.9	0.1	0.013	199.758
Experiment 18	1.3	0.9	0.1	1.3	0.5	0.017	238.704
Experiment 19	1.3	1.3	0.5	1.7	0.9	0.001	223.913
Experiment 20	1.3	1.7	0.9	0.1	1.3	0.009	366.241
Experiment 21	1.7	0.1	1.7	1.3	0.9	0.005	304.802
Experiment 22	1.7	0.5	0.1	1.7	1.3	0.009	263.651
Experiment 23	1.7	0.9	0.5	0.1	1.7	0.013	322.965
Experiment 24	1.7	1.3	0.9	0.5	0.1	0.017	338.985
Experiment 25	1.7	1.7	1.3	0.9	0.5	0.001	283.951