Cutting-Caving Ratio Optimization of Fully Mechanized Caving Mining with Large Mining Height of Extremely Thick Coal Seam

Table 2

Coal seam strength and thickness under different cutting heights.

Cutting height (m)	Requirements for the coal seam strength (MPa)	Requirements for the coal seam thickness (m)
3.0	>0.8	<13
3.5	>0.9	<15
4.0	>1.1	<17
4.5	>1.4	<19
5.0	>1.6	<22