Mining Failure Response Characteristics of Stope Floor: A Case of Renlou Coal Mine

Table 1

Installation parameters of fixed-point fiber grating position.

Section number	Grating installation sequence	Hole length (m)	Vertical depth from floor (m)	Remarks
Section 3	1	40.50	31.01	Please install Section 3 of the optical fiber first, and then install Sections 2 and 1 in sequence; next, install the first fixed-point grating 1.5 m from the bottom of the hole
	2	38.50	29.48
	3	36.50	27.95
	4	34.50	26.42
	5	32.50	24.89
	6	30.50	23.36
	7	28.50	21.82
	8	26.50	20.29
Section 2	9	24.50	18.76
	10	22.50	17.23
	11	20.50	15.70
	12	18.50	14.17
	13	16.50	12.64
	14	14.50	11.10
	15	12.50	9.57
	16	10.50	8.04
Section 1	17	8.50	6.51	The fixed-point grating closest to the orifice is 2.5 m away from it
	18	6.50	4.98
	19	4.50	3.45
	20	2.50	1.91