Evaluation Method of Floor Heave Damage Degree and a Case Study in Zaoquan Coal Mine, China

Table 2

Classification of influence of coal pillar size on floor heave of roadway [27, 28].

Coal pillar size P (m)	0∼3	3∼5	5∼7	7∼9	9∼11
Floor heave (mm)	200∼300	300∼400	400∼500	>580	<400