Stress Monitoring for Anchor Rods System in Subway Tunnel Using FBG Technology

Table 1

Test results of Group M-A (unit: kN).

	Stage 1	Stage 2	Stage 3	Stage 4	Stage 5	Stage 6	Stage 7
1-1	−0.31	−3.27	−3.24	−2.07	−2.50	−3.52	−21.56
1-2	−0.59	−4.35	−4.32	−2.79	−3.32	−6.48	−33.55
2-1	−0.40	−2.80	−2.80	−2.50	−2.68	−4.77	−33.21
2-2	−0.56	−3.03	−3.06	−2.84	−2.97	−7.40	−40.91
3-1	−0.05	0.68	0.65	0.47	0.62	−3.77	−12.38
3-2	−0.06	0.32	0.25	0.12	0.25	−1.62	−8.21
4-1	−0.06	0.62	0.59	0.71	2.31	3.05	13.27
4-2	−0.08	0.57	0.56	0.43	2.21	4.65	17.30
5-1	0.40	3.91	3.89	5.56	4.36	5.96	9.27
5-2	0.40	3.67	3.67	4.73	4.11	4.57	13.07
6-1	0.37	2.18	2.27	3.35	2.30	7.83	25.91
6-2	0.31	2.06	2.03	2.59	2.25	5.67	30.81
7-1	−0.19	0.50	0.48	1.46	0.55	3.57	2.34
7-2	−0.47	0.87	0.90	1.81	1.05	7.78	16.45
8-1	−1.01	−2.05	−2.07	−1.44	−2.15	−11.75	−43.59
8-2	−1.16	−2.19	−2.17	−1.64	−2.23	−11.80	−42.12
9-1	−0.77	−3.24	−3.27	−2.98	−3.20	−5.67	−22.42
9-2	−0.97	−3.53	−3.56	−3.24	−3.46	−8.27	−36.81