Research on Stability of an Open-Pit Mine Dump with Fiber Optic Monitoring

Table 7

Corresponding data of the strain of each optical fiber.

Fiber no.	Fiber length (m)	Position with sudden change in the strain (m)	Strain in the place with sudden change (με)	Strain increment (με)
X11	0.667	0.59	1624	571
X12	0.667	0.43	2028	917
X13	0.667	0.36	2558	1236
X14	0.667	0.32	2777	1497
X15	0.667	0.44	2323	1170
X16	0.667	0.61	1708	731
X21	1.078	0.92	1042	346
X22	1.078	0.69	1675	721
X23	1.078	0.63	1991	971
X24	1.078	0.64	1969	912
X25	1.078	0.67	1910	952
X26	1.078	0.87	1292	552
Y11	2.0	0.21/1.75	2066/2195	892/994
Y12	2.0	0.82/1.27	1772/1698	892/690
Y21	2.0	0.81/1.20	1541/1321	661/424
Y21	2.0	—	—	—
Z1	1.694	0.46	695	309
Z2	1.694	0.43	709	314
Z3	1.694	0.85	885	338
Z4	1.694	0.87	896	357