Study on the Development Height of Overburden Water-Flowing Fracture Zone of the Working Face

Table 3

Measuring results of water-flowing fracture zone.

Observation borehole	Elevation angle (°)	Length (m)	Height of water-flowing fracture zone (m)
Borehole 1	45	80	38.9
Borehole 2	40	85	35.9
Borehole 3	43	80	39.6
Borehole 4	45	80	38.2
Borehole 5	40	85	36.4
Borehole 6	45	80	41.3
Borehole 7	42	85	39.7