Table 4.

Caving zone height comparison of different test methods and mining technologies.

Adopted Method	Mining Technology	Mining Height/m	Maximum Caving Zone Height/m
On-site detection	Top-layer mining	3.40	13.1
	Bottom-layer mining	5.80	14.65
Simulation detection	Top-layer mining	2.50	12
	Bottom-layer mining	3.50	13.5
Simulation detection	Once full-height mining	6.00	21
Formulas in standard	Once full-height mining	6.00	14.9~24.0