Table 1 The size of the specimens.

From: Characteristics of coal crack development and gas desorption in the stress affected zone of rock pillar

Coal specimen number

Diameter × height

Aspect ratio

Remark

1

49.83 mm×99.16 mm

1.99

Conventional triaxial loading

2

49.18 mm×100.28 mm

2.04

3

49.59 mm×100.19 mm

2.02

4

49.87 mm×99.88 mm

2.00

CT scanning