Table 4 Key parameters for LGF of MTOS.

From: Mechanism and application of competitive fracture propagation in layered group fracturing of massive thick overburden strata

Borehole name

Height to coal/m

Borehole diameter/mm

Initial inclination angle/°

Total deflection angle/°

Length of inclined borehole/m

Length of horizontal borehole/m

Total length of borehole/m

High-level fracturing borehole

65.75

75

60

60

151.52

128.12

279.64

Mid-level fracturing borehole

44.83

75

50

50

122.95

143.75

266.70

Low-level fracturing borehole

12.85

75

33

33

66.37

187.5

253.88

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