Failure Mechanism for Surrounding Rock of Deep Circular Roadway in Coal Mine Based on Mining-Induced Plastic Zone

Table 1

Magnitudes of morphological indexes for the plastic zone.

Morphology		Basic parameters				Morphological indexes
		(m)	(m)	(m)	(m^2)			(m)
Butterfly shape	3.03	13.24	2.66	97.39	218.23	3.46	12.13	8.33	5.76	4.98