Analysis on Evolution Law of Small Structure Stress Arch and Composite Bearing Arch in Island Gob-Side Entry Driving

Table 1

Partition and stress arch height of coal pillar in transportation channel.

Partition category	Thickness/m
Fractured zone	2.22
Plastic softening zone	2.39
Width of coal slope failure zone	4.61
Plastic hardening zone	2.49
Width of limit equilibrium zone	7.1
Arch height (small structure height)	10.738