Calculation Method of Overburden Damage Height Based on Fracture Mechanics Analysis of Soft and Hard Rock Layers

Table 7

Influence parameter list of overlying stratum failure height in N1102 working face.

Working face	Mining height (m)	Hard rock lithology ratio (%)	Tendency length (m)	Buried depth (m)	Advancing speed (m/d)	Overlying strata damage height (m)
N1102	6.3	56.63	280	420 m	5	64.83