Dynamic Monitoring and Research on the Evolution of the Damage of Weakly Consolidated Coal Floor under Dynamic Pressure Using Distributed Optical Fiber

Table 3

Distributed fiber strain maximum distribution.

Borehole	Extreme value of strain increment (με)	Floor vertical depth (m)	Layer	Distance between working face and orifice (m)
1#	-1098	-8.4	Fine sandstone	33.4
	893 με	-7.2	Fine sandstone	0
2#	-2055 με	-16.5	Siltstone	48.0
	669 με	-15.2	Siltstone	0