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

Table 2

The development height table of the two zones after the end of the working face.

Working face	1# drilling		2# drilling		Average
	Height of collapse zone/m	Height of fissure zone/m	Height of collapse zone/m	Height of fissure zone/m	Height of collapse zone/m	Height of fissure zone/m
2301 working face	19.6	149.6	20.8	150.4	20.2	70.6
222 working face	70.0	256.4	71.2	258.4	150.0	257.4