Study on the Prediction of the Height of Two Zones in the Overlying Strata under a Strong Shock

Table 3

Formula calculates the development height range of the two zones.

Working face stoping situation	Strike model overlying two zones
	Height range of collapse zone/m	Height range of fissure zone/m
2301 working face stoping end	15.2 ~20.2	51.9 ~69.7
222 working face stoping end	28.7 ~33.7	65.8 ~83.6