Predicting Overburden-Induced Failure Height of Large Mining Face in Shallow Coal Seam Based on Half-Plane Theory

Table 1

Error analysis of “three zones” height in overlying strata by empirical formulas.

Working face	Overlying strata	Empirical formula (m)	Measured value (m)	Error (m)	Relative error (%)
31401	Collapse zone	9.01∼25.62	17.06	8.05∼8.61	50.46
	Water-conducting fracture zone	36.07∼52.43	153.90	101.47∼117.83	76.56