A New Statistical Parameter for Determining Joint Roughness Coefficient (JRC) considering the Shear Direction and Contribution of Different Protrusions

Table 1

10 standard roughness joint profiles [9].

No.	Typical roughness profiles	JRC range
1		0∼2 (0.4)
2		2∼4 (2.8)
3		4∼6 (5.8)
4		6∼8 (6.7)
5		8∼10 (9.5)
6		10∼12 (10.8)
7		12∼14 (12.8)
8		14∼16 (14.5)
9		16∼18 (16.7)
10		18∼20 (18.7)
Scale